US20020083981A1 - Media control valve - Google Patents
Media control valve Download PDFInfo
- Publication number
- US20020083981A1 US20020083981A1 US10/005,484 US548401A US2002083981A1 US 20020083981 A1 US20020083981 A1 US 20020083981A1 US 548401 A US548401 A US 548401A US 2002083981 A1 US2002083981 A1 US 2002083981A1
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- US
- United States
- Prior art keywords
- valve
- media
- valve body
- housing
- plunger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/246—Combination of a sliding valve and a lift valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/794—With means for separating solid material from the fluid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8225—Position or extent of motion indicator
Definitions
- the present invention is related to media control and, more specifically, media control valves used to control the flow of a media into a fluid stream as part of an apparatus for treatment of a surface.
- a typical media control valve is disclosed in U.S. Pat. No. 3,476,440 (“the '440 patent”), which is hereby incorporated by reference in its entirety.
- the valve of the '440 patent is attached to a media vessel and controls the flow of the media from the media vessel into a conduit containing a fluid stream. This conduit terminates in a nozzle. Fluid and media pass through the nozzle at high speed and are typically used to treat surfaces.
- U.S. Pat. No. 5,810,045 (“the '045 patent”) discloses a valve for introducing particulate materials into a high-pressure air stream and suggests several uses for this valve.
- the '045 patent suggests that the valve may be used for purposes such as introducing fluid catalytic cracking catalyst particles into fluid catalytic cracking units used to crack and reform various petroleum based products, introducing particulate catalysts into other kinds of chemical processes, and spraying particulate ingredients on adhesive substrates as part of various manufacturing processes.
- the '045 patent discussed previously, also discloses a modification of the original media control valve, including the use of multiple seals around a plunger of the valve with an exhaust therebetween to remove any contaminants that breach the seals.
- a media control valve including a valve body having a media inlet and a media outlet, and a plunger and sleeve positioned within the valve body.
- the media control valve also includes a media opening in the sleeve having a first portion proximate to the media outlet and a second portion distal to the media outlet, wherein the second portion is broader than the first portion.
- the media control valve further includes a housing connected to the valve body, a piston positioned within the housing and connected to the plunger, and a base connected to the valve body in communication with the media outlet.
- a valve including a body having an opening and an outlet.
- the opening in the outlet includes a first portion proximate to the outlet and a second portion distal to the outlet, wherein the second portion is broader than the first portion.
- the valve further includes a closing member positioned within the body so as to selectively cover the opening.
- a valve including a body and a closing member positioned within the body.
- the valve also includes a housing and a piston within the housing.
- the piston is connected to the closing member and has a contaminant isolation region.
- a media control valve including a valve body having a media inlet and a media outlet, and a plunger and sleeve positioned within the valve body.
- the media control valve also includes a media opening in the sleeve, a housing connected to the valve body, a piston having a contaminant isolation region positioned within the housing and connected to the plunger and a base connected to the valve body in communication with the media outlet.
- a media control system including a media vessel, an air flow path, a media flow path, and a media control valve positioned on the media flow path.
- the media flow path has a substantially linear axis and includes a media inlet connected to the media vessel and a media outlet connected to the media flow path.
- a media control valve including a valve body comprising a media inlet and a media outlet, and means for providing a gentle seal positioned within the valve body.
- the valve also includes a sleeve positioned within the valve body, a media opening in the sleeve, a housing connected to the valve body, and a base connected to the valve body and in communication with the media outlet.
- FIG. 1 is a diagram of a blasting system incorporating the media control valve of the present invention
- FIG. 2 is a cross-sectional side view of a media control valve according to an aspect of the present invention
- FIG. 3 is an exploded, elevational view of the valve shown in FIG. 2;
- FIG. 4 is a side elevational view of a sleeve according to one embodiment of the present invention.
- FIG. 5 is an illustration of example embodiments of a media opening according to the present invention.
- FIG. 6 is a perspective view of the sleeve illustrated in FIG. 4 with phantom lines to show relative thickness;
- FIG. 7 is a bottom plan view of the sleeve illustrated in FIG. 4 with phantom lines to show relative thickness;
- FIG. 8 is a cross-sectional side view of the sleeve illustrated in FIG. 4, taken along section line 8 - 8 of FIG. 7;
- FIG. 9 is a top plan view of a plunger according to one embodiment of the present invention.
- FIG. 10 is a cross-sectional side view of the plunger illustrated in FIG. 9, taken along section line 10 - 10 of FIG. 9;
- FIG. 11 is a cross-sectional side view of a media control valve according to an aspect of the present invention.
- FIG. 12 is an exploded, elevational view of the valve shown in FIG. 11;
- FIG. 13 is a partial side view of one aspect of the present invention.
- the present invention is directed to a valve for controlling the flow of a media to a fluid stream, referred to herein as a media control valve.
- media it is meant any material or materials that may be desired to be added to another material or materials. While various solid, fine particulate, blasting media, such as sand, metal shot, and the like, are used by way of example herein, the media that may be supplied by the media control valve of the present invention is not so limited, and may include a wide variety of materials including liquids and gasses as well as solid particles.
- the media control valve of the present invention includes a valve body having a media inlet and a media outlet.
- a housing is connected to the valve body.
- a plunger is positioned within the valve body and is connected to a piston positioned within the housing.
- a base is connected to the valve body such that it communicates with the media outlet.
- the media control valve of this embodiment may further include a sleeve disposed between the valve body and the plunger. This sleeve may contain a media opening.
- the media opening has a first portion proximate to the media outlet and a second portion distal to the media outlet, the second portion being broader than the first portion.
- the piston includes a contaminant isolation region.
- FIG. 1 illustrates a typical system in which the media control valve of the present invention may be employed.
- a media control valve 10 is part of a blast system 150 used to treat a surface by projecting a media 140 at the surface.
- Media 140 typically consists of solid particles, such as sand, shot, nut shells, sodium bicarbonate, other abrasives, and the like depending on the surface being treated and the materials(s) being removed from the surface.
- Blast system 150 includes a fluid supply 100 which supplies a fluid stream through conduit 110 .
- the fluid employed is air, though any readily available, relatively inert carrier fluid may be employed.
- Media 140 may be stored in a media vessel 130 and supplied to the fluid stream within conduit 110 through actuation of media control valve 10 . The fluid stream and entrained media 140 then pass through conduit 110 to a nozzle 120 where they are directed at a surface to be treated.
- media control valve 10 may include a valve body 20 having a media inlet 22 and a media outlet 24 .
- a plunger 30 is positioned within valve body 20 and a sleeve 32 is positioned between valve body 20 and plunger 30 .
- Sleeve 32 may include a media opening 34 that allows media to pass from media inlet 22 to media outlet 24 when plunger 30 is not blocking such flow.
- media control valve 10 further includes a housing 40 that is connected to valve body 20 .
- a piston 42 is connected to plunger 30 and positioned within housing 40 .
- a base 60 is connected to valve body 20 such that it communicates with media outlet 24 .
- Valve body 20 may be constructed in any manner and of any materials that provide valve body 20 the desired configuration and durability.
- valve body 20 may be constructed with media inlet 22 .
- Media inlet 22 may be constructed in any manner that allows it to receive media.
- media inlet 22 may be constructed to connect to a media vessel.
- media inlet 22 When media inlet 22 is constructed to connect with a media vessel, it may be constructed to connect in any manner that provides a secure connection and allows media to flow into valve body 20 from the media vessel.
- media inlet 22 may be threaded, or otherwise provided with a fitting such that it may mate with a connector attached to the media vessel.
- Valve body 20 may also be constructed with media outlet 24 .
- Media outlet 24 may be constructed in any manner that allows media to pass from valve body 20 into a fluid passage 62 within base 60 .
- media outlet 24 may be an aperture of any size and shape capable of delivering media in an adequate volumetric flow through a conduit, and, most typically, to a blast nozzle.
- media outlet 24 may be shaped as a circular hole.
- Valve body 20 may also be constructed to house plunger 30 .
- Valve body 20 may include an open area having a shape corresponding to plunger 30 .
- Valve body 20 may also be constructed to allow sleeve 32 , seals 36 or seat 26 to reside within valve body 20 .
- the opening in valve body 20 for receiving plunger 30 may be large enough to also accommodate sleeve 32 or seals 36 between plunger 30 and valve body 20 .
- valve body 20 may include a portion shaped to accommodate seat 26 , typically adjacent to media outlet 24 .
- Valve body 20 may also be constructed with a mechanism for allowing the media to pass out of the media vessel without passing into the conduit.
- valve body 20 may include a bypass or cleanout 28 .
- Cleanout 28 may be constructed in any manner which allows the media to flow out of the media vessel without entering the conduit.
- cleanout 28 may include an opening in valve body 20 communicating directly with media inlet 22 . Typically during operation of media control valve 10 , cleanout 28 is closed. Cleanout 28 may also include an opening onto which a cover may be mated when it is desired to close cleanout 28 .
- Valve body 20 may be constructed of any material or materials that have sufficient durability for valve body 20 and are compatible with media and other materials which may come in contact with valve body 20 .
- valve body 20 may be constructed of various metals and metal alloys.
- valve body 20 is constructed of an aluminum alloy because of its relatively low weight and cost and relatively high strength and abrasion resistance.
- the aluminum alloy has a hard-coat anodized finish to improve its abrasion resistance.
- valve body 20 is constructed of 356 T6 aluminum alloy with a hard-coat anodized finish.
- Valve body 20 may be constructed by any method capable of producing valve 20 from a desired material or materials of construction.
- valve body 20 may be cast, machined or both.
- valve body 20 is constructed by casting, and, more preferably, investment casting, because casting is relatively inexpensive and produces a relatively high quality product having sufficient dimensional stability.
- plunger 30 may be constructed in any manner and using any materials resulting in plunger 30 having the shape and durability to selectively prevent flow of media through valve body 20 .
- plunger 30 may be constructed in any shape that may mate with valve body 20 , sleeve 32 and seals 36 to selectively prevent flow of media from media inlet 22 to media outlet 24 .
- plunger 30 is typically constructed such that it may move within valve body 20 , selectively exposing a media opening 34 in sleeve 32 and allowing the media to flow from media inlet 22 to media outlet 24 .
- plunger 30 is cylindrical and of uniform cross-section.
- Plunger 30 may be constructed to mate with piston 42 .
- plunger 30 may be threaded at one end, such that it may be mated to piston 42 with a threaded nut 70 .
- plunger 30 may thread directly into piston 42 or be connected with another connector known to those of skill in the art.
- Plunger 30 may be constructed of any material or materials that are sufficiently durable and inert to selectively prevent the passage of media through or past plunger 30 and to provide long life of plunger 30 .
- plunger 30 may be constructed of the same material or materials as valve body 20 .
- plunger 30 may be constructed of steel, such as 304 stainless steel, with harder material, such as tungsten carbide, on the outer, lower portion 31 of plunger 30 . These materials are selected due to their relatively high strength and dimensional stability.
- Plunger 30 may be made by any conventional method to produce the desired shape from the material or materials of construction.
- plunger 30 may be constructed by the same method as valve body 20 .
- Sleeve 32 may be constructed in any manner and of any materials to produce a desired configuration to be contained within valve body 20 and to mate with plunger 30 .
- sleeve 32 may be constructed as a cylindrical annulus where plunger 30 is cylindrical and valve body 20 contains a cylindrical opening therein.
- Sleeve 32 may be constructed with a media opening 34 to control the flow of media from media inlet 22 to media outlet 24 .
- Media opening 34 may be constructed in any shape that controls the flow of media 140 from media inlet 22 to media outlet 24 as desired when valve 10 is open. For example, as illustrated in FIG.
- media opening 34 may be irregularly shaped, or, more conventional, with a circular, elliptical, or other geometric shaped opening; alternatively it may only include a narrow opening.
- media opening 34 includes a first portion 200 proximate to media outlet 24 and a second portion 202 distal to media outlet 24 , second portion 202 being broader than first portion 200 . This embodiment of media opening 34 facilitates metering particulate media when media valve 10 is in a partially open position.
- valve body 20 may be constructed in a manner which is equivalent to sleeve 32 being fused to valve body 20 .
- Sleeve 32 may be formed out of any material that may be shaped as desired and provides sufficient durability.
- sleeve 32 may be formed of a material that may maintain the shape of media opening 34 despite the passage of media 140 through media opening 34 over time.
- sleeve 32 may be constructed of a metal, metal alloy or polymer.
- sleeve 32 like plunger 30 , is constructed of steel with tungsten carbide on the surfaces subject to the most wear, such as the inner, lower portion 35 of sleeve 32 . Again, these materials are selected due to their abrasion resistance and dimensional stability.
- sleeve 32 may vary with the media used and, in other embodiments, other materials may be preferred.
- Sleeve 32 may be constructed by any method that produces sleeve 32 having the desired shape and durability out of the material or materials of construction.
- sleeve 32 may be constructed by sintering, casting or molding and polymerization of a prepolymer.
- One or more seals 36 may be positioned between plunger 30 and valve body 20 to prevent media, fluid from the conduit or other contaminants from passing between valve body 20 and housing 40 .
- three seals 36 are positioned between plunger 30 and valve body 20 to prevent contamination.
- the likelihood of contamination is much greater from valve body 20 to housing 40 than the reverse.
- seals 36 are typically oriented to face valve body 20 .
- one or more of seals 36 may be oriented to face housing 40 .
- several seals 36 are formed as a unitary structure.
- three seals may be formed as a single solid piece of material.
- Seals 36 may be formed out of any material that will provide an adequate seal with sufficient durability.
- seals 36 may be formed of a resilient, pliable material, such as some polymers. The material may also be abrasion resistant and have a low coefficient of friction.
- seals 36 may be constructed of an elastomer.
- seals 36 are constructed of molythane because it is self-lubricating or urethane because of its abrasion resistance.
- Seals 36 may be constructed by any method that produces seals 36 having the desired seal and durability out of the material or materials of construction.
- seals 36 may be constructed by molding and polymerization of a prepolymer.
- Seat 26 may be constructed of any material or materials and in any manner that produces a solid connection with plunger 30 when media control valve 10 is in a closed position.
- seat 26 may be constructed to fit snugly with plunger 30 .
- plunger 30 is cylindrical
- seat 26 may be a circular annulus.
- Seat 26 may be constructed of the same materials and using the same methods as seals 36 .
- Seat 26 may also be constructed of less resilient materials than would typically be used for seals 36 and may even be formed of the same material as valve body 20 .
- Housing 40 may be constructed in any manner and of any material or materials that produce housing 40 that may be connected to valve body 20 , house piston 42 and have sufficient durability.
- housing 40 may be constructed to function as a cylinder for piston 42 .
- the inside of housing 40 is a uniform circular cylinder, however, this is not required as long as the inside of housing 40 connects with piston 42 to provide a seal.
- Housing 40 may be constructed such that piston 42 may travel within housing 40 .
- piston 42 has sufficient range of motion to allow plunger 30 to move from a fully open position in which plunger 30 does not obstruct media opening 34 to a fully closed position in which plunger 30 rests against valve seat 26 , completely obstructing flow through media opening 34 .
- Piston 42 may effectively divide housing 40 into a drive chamber 44 and an exhaust chamber 46 .
- housing 40 may be constructed with a drive inlet 48 to drive chamber 44 , allowing pressure to be applied to piston 42 to open media control valve 10 .
- Housing 40 may also include one or more vents 50 in exhaust chamber 46 , allowing fluid to flow into and out of exhaust chamber 46 as the volume within exhaust chamber 46 varies with the motion of piston 42 .
- Vents 50 may include filters 52 to prevent contaminants from entering housing 40 while still allowing vents 50 to perform their exhaust function.
- filters 52 in vents 50 are capable of filtering particles larger than about 20 microns as this filters most particles, but does not restrict the flow of fluid through vents 50 enough to significantly affect performance of media control valve 10 .
- particles less than about 20 microns may be able to fit between housing 40 and piston 42 and are less likely to damage piston 42 or cause piston seal 58 to fail.
- a suitable filter 52 may be constructed by sintering an appropriate material, such as a metal of metal alloy.
- the filter is constructed of sintered brass.
- Housing 40 may be constructed to provide access to the inside of housing 40 .
- housing 40 may include a cap 66 , which may be removed to provide access to the inside of housing 40 .
- Cap 66 may be constructed in any manner that allows it to connect securely with housing 40 yet allows access to the inside of housing 40 .
- cap 66 may be constructed to cover the open top of housing 40 , and may include structure allowing it to be connected to housing 40 .
- cap 66 and housing 40 may include matching holes, through which bolts 68 may be inserted to secure cap 66 to housing 40 .
- four evenly spaced bolt holes 64 and bolts 68 are used to secure cap 66 to housing 40 .
- Cap 66 may be constructed of the same materials and by the same method as housing 40 .
- Housing 40 may also be constructed to include structure to allow the adjustment of the operation of media valve 10 .
- housing 40 may enclose a spring 56 and attendant structure to adjust the tension on spring 56 and, thus, the operation of media control valve 10 .
- housing 40 may include an air shock (not shown) and attendant structure.
- spring 56 rests between piston 42 and cap 66 , biasing piston 42 and plunger 30 toward media outlet 24 and thus biasing media control valve 10 into a closed position.
- the tension on spring 56 may be used to control how difficult it is to move piston 42 , and thus, the amount of pressure required to actuate media control valve 10 or the degree of actuation for a given pressure.
- Structure to adjust the tension on spring 56 may include a spring retainer 80 that mates with housing 40 .
- spring retainer 80 is used to allow the tension on spring 56 to be adjusted
- a device for facilitating the adjustment of spring retainer 80 such as a knob 82 , crank or other handle, may be used.
- An O-ring 84 or like seal, may be positioned between spring retainer 80 and housing 40 , to prevent the ingress of contaminants into housing 40 .
- Media control valve 10 may include a metering indicator.
- spring retainer 80 may include marking corresponding to the degree to which media control valve 10 is open.
- Housing 40 may be constructed of any material or materials that may be shaped in the desired configuration and has sufficient durability to provide long life.
- housing 40 may be constructed of the same materials as valve body 20 .
- housing 40 may be constructed using the methods discussed with respect to valve body 20 .
- Piston 42 may be constructed in any manner and using any materials that allow it to fit snugly within housing 40 and to connect with plunger 30 such that plunger 30 is moved with the motion of piston 42 .
- piston 42 may relatively flat and shaped to match the cross-section of housing 40 .
- piston 42 will be circular to match the circular cross-section of cylindrical housing 40 .
- Piston 42 may be constructed with structure to connect it to plunger 30 .
- plunger 30 includes a threaded region
- piston 42 may have a hole therein through which a portion of plunger 30 is inserted, and nut 70 threaded onto, to attach piston 42 to plunger 30 .
- Piston 42 may be constructed with structure to insure that fluid, media, contaminants and other materials are prevented from passing between drive chamber 44 and exhaust chamber 46 of housing 40 .
- piston 42 may be constructed with one or more retainers adapted to maintain a piston seal 58 in place around piston 42 .
- Piston 42 may be constructed to reduce the adverse effect of media and other contaminants that find their way into drive chamber 44 .
- piston 42 may include a contaminant isolation region 48 where contaminants are collected and isolated from more sensitive areas of media control valve 40 , such as the walls of housing 40 and piston seal 58 .
- contaminant isolation region 48 includes a recess in piston 42 .
- piston 42 may have an overall dish shape, allowing contaminants to settle into the dish.
- Piston 42 may be constructed of any material or materials that provide sufficient rigidity and durability.
- piston 42 may be constructed of a metal, metal alloy or polymer.
- piston 42 is constructed of aluminum because of its relatively high strength and relatively low cost and weight. More preferably, piston 42 is constructed of 356 T6 aluminum.
- Piston 42 may be hard-coat anodized. Piston 42 may be constructed by any method that produces piston 42 from the desired material or materials of construction, such as casting, machining or molding.
- structure to prevent piston 42 from impacting against housing 40 or cap 66 may be included in media control valve 10 .
- structure may be positioned within housing 40 to absorb the impact of piston 42 striking housing 40 or cap 66 .
- this structure may comprise a bumper, such as bump ring 86 , capable of absorbing the impact of piston 42 striking it.
- Bump ring 86 may be constructed in any manner and of any material or materials that allow it to intercept piston 42 and to dissipate some of its impact energy.
- bump ring 86 may be constructed as an elastomeric ring and made by a method suitable to the material.
- bump ring 86 is constructed from neoprene because of its impact absorbing ability.
- piston 42 may also be constructed as a diaphragm. Where piston 42 is constructed as a diaphragm, it may be constructed such that it is connected at its edges to housing 40 , but is free to move in a central portion connected to plunger 30 .
- piston 42 may be constructed of a flexible material, which may be an elastomer. Such material may be selected based on its degree of flexibility and its ability to withstand repeated flexing over an extended period of operation of media control valve 10 .
- media control valve 10 may be subject to significant vibration, for example, due to a mechanical agitator operated to improve media flow. Vibration is undesirable because it may, for example, result in a change in metering position. Accordingly, it may be desired to add structure to media control valve 10 that dampens vibration. For example, a structure capable of absorbing vibrational energy or adding friction to prevent parts from vibrating apart may be included in media control valve 10 .
- a vibration disc 88 is positioned between spring 56 and spring retainer 80 to create friction and prevent slipping of spring retainer 80 , potentially resulting in a loss of metering position. Vibration disc 88 may be constructed in any manner and of any material or materials that allow it create friction between two parts.
- vibration disc 88 should not create so much friction that it prevents adjustment or detachment of the parts.
- vibration disc 88 may be circular, polygonal or of any other shape and may be formed of any material having a relatively high coefficient of friction.
- vibration disc 88 is formed of a polymeric material.
- vibration disc 88 is constructed of polyurethane because it may create friction without preventing adjustment.
- Base 60 may be constructed in any manner and of any materials that allow communication between media outlet 24 and fluid passage 62 .
- base 60 may be adapted to be attached to valve body 20 and conduit 110 , such that fluid passage 62 is in communication with both media outlet 24 and conduit 110 .
- an opening in base 60 is placed in communication with media outlet 24 , allowing media to pass into fluid passage 62 .
- the opening between media outlet 24 and gas passage 62 may be larger than media opening 34 in sleeve 32 , ensuring that it is not the flow-limiting restriction and allowing media to disperse, making it easier for plunger 30 to move the media aside as it closes.
- Base 60 may be constructed with structure allowing it to be connected to valve body 20 .
- the structure allowing base 60 to be attached to valve body 20 may be integrally formed with base 60 , allowing base 60 to be unitary structure.
- This embodiment is in contrast to typical media control valve bases wherein the base consists of several pieces, such as a separate fluid passage 62 and attachment structure for attaching fluid passage 62 to valve body 20 .
- base 60 may include bolt holes 64 through which bolts 68 may be passed to connect base 60 to valve body 20 .
- bolt holes 64 extend not only through base 60 but also through valve body 20 and into housing 40 .
- removing bolts 68 allows media control valve 10 to be quickly disassembled for inspection, modification or maintenance.
- bolts 68 may be removed to allow access to and replacement of sleeve 32 , such that sleeve 32 may be replaced with an alternate sleeve 32 having a different media opening 34 .
- bolts 68 may be removed to provide access to seals 36 for routine maintenance and repair.
- base 60 , valve body 20 and housing 40 each include four corresponding bolt holes evenly distributed about such structures to provide a secure connection therebetween.
- Housing 40 and valve body 20 may include further mating structure that facilitates the attachment of housing 40 and body 20 .
- one of housing 40 and valve body 20 may include a grove 38 or protrusion 54 that mates with a corresponding groove 38 or protrusion 54 in the other one of housing 40 and valve body 20 .
- Base 60 may be constructed of any material that may be shaped in the desired configuration and has sufficient durability to provide long life.
- base 40 may be constructed of various metals or metal alloys.
- base 60 is constructed of carbon steel, such as 4140 carbon steel, because of its strength, cost, and ability to be hardened and cast. Where base 60 is constructed of carbon steel, it may be heat treated, for example, to approximately 55 Rockwell C, and may be phosphate coated to inhibit rusting.
- Base 40 may be constructed using the methods discussed with respect to valve body 20 .
- fluid passage 62 may be subject to mechanical or chemical damage. Accordingly, structure may be added to fluid passage 62 to resist such damage.
- a flow sleeve (not shown) may be positioned within fluid passage 62 .
- the flow sleeve may be constructed of any material that is sufficiently chemically and/or mechanically resistant.
- the flow sleeve may be constructed of polyurethane by conventional techniques.
- FIGS. 11 - 12 An alternate embodiment of a media control valve 10 of the present invention is illustrated in FIGS. 11 - 12 .
- This embodiment serves as an example of another of the variety of valve structures within the scope of the present invention and illustrates other features that may be incorporated into the media control valves of the present invention.
- media control valve 10 provides a gentle seal.
- gentle seal it is meant a seal in which there are no sharp edges forced against the seat when the valve is closed. Such an embodiment is illustrated in FIGS. 11 and 12.
- a gentle seal may be provided by any structure on plunger 30 or seat 26 that does not provide a hard or sharp edge abutting seat 26 .
- the end of plunger 30 may be rounded or beveled, or may include a rounded or beveled structure attached thereto.
- the entire end of plunger 30 is beveled or rounded.
- just the edges of plunger 30 are rounded or beveled.
- the bevel angle 100 may be less than about 60 degrees with respect to a plane 98 defined by the end of plunger 30 . In other embodiments, bevel angle 100 may be less than about 45 degrees, less than about 30 degrees, or less than about 15 degrees.
- seat 26 may be as described previously and is preferably a flexible material, such as polyurethane, which may improve the seal.
- Seat 26 may also be constructed to facilitate formation of a gentle seal.
- seat 26 may be shaped to mate with plunger 30 , having a curved or beveled edge at its opening, or the like.
- Conventional media control valves and even the valve of the embodiment of the invention illustrated in FIGS. 2 and 3, include a media flow path that causes media to change direction and thus impact against it as it passes through the path.
- media flow path it is meant a path between media inlet 22 and media outlet 24 through which media passes when valve 10 is open. It has now been recognized that because of the impact between the media and the media flow path, the media flow path may be degraded. Furthermore, the flow of media may be slowed and impeded by the contact. Accordingly, in one embodiment, the present invention is directed to a media control valve 10 having a flow path 92 designed to reduce impact with the media.
- flow path 92 may have a substantially linear axis 96 .
- Media flow path 92 having substantially linear axis 96 may be free of bends, crooks, and the like, such that media may flow directly from media vessel 130 into fluid path 62 with little or no contact with media flow path 92 . Reduction of contact between media flow path 92 and the media may be facilitated by orienting media flow path 92 substantially perpendicularly with respect to the surface upon which the media control system rests. However, such and arrangement is not required, particularly where the flow of media is primarily due to a pressure differential rather than to gravitational forces. Media flow path 92 may be oriented substantially perpendicularly with respect to fluid path 62 , which, in most embodiments, will be an air flow path.
- media flow path 92 may be largely unavoidable. For example, contact may occur because of scattering of the media or narrowing of media flow path 92 . Nonetheless, to the extent that impact is reduced by straightening of media flow path 92 , such an arrangement is within the scope of the present invention.
- sleeve 32 To facilitate alignment of sleeve 32 such that media opening 34 is properly oriented, structure may be included on sleeve 32 and/or valve body 20 .
- a mating structure such as a ridge and groove, pin and hole, or the like, may be used to facilitate proper alignment.
- a separate sleeve pin 90 is designed to mate with corresponding holes in valve body 20 and sleeve 32 .
- FIGS. 11 and 12 The illustrative embodiment of FIGS. 11 and 12 demonstrates that media control valve 10 according to the present invention may be constructed relatively simply and, where desired, may be of small size. Such an embodiment may be preferred, for example, in applications where a small, simple valve may be desired to decrease cost or to increase portability.
- media control valve 10 may be constructed as an on-off valve, meaning that it has only fully open and fully closed positions. In such an on-off valve, flow control may be accomplished by changing the size of media opening 34 or the pressure differential across the valve.
- this embodiment includes a plunger 30 capable of also functioning as a piston in housing 40 , lowering cost and improving serviceability.
- This embodiment as any embodiment of the present invention, may be constructed of the materials and in the manner previously described herein.
- FIGS. 11 and 12 and the embodiment illustrated in FIGS. 2 and 3 are interchangeable and may be combined or interchanged with other features of conventional media control valves.
- the use of a media opening 34 having a narrower and a broader portion may be accommodated in the embodiment illustrated in FIGS. 11 and 12.
- the use of a media flow path 92 having a substantially linear axis 96 may be desirable in the embodiment illustrated in FIGS. 2 and 3.
Abstract
Description
- This patent application is a continuation-in-part application and claims priority to U.S. Ser. No. 09/709,894, filed Nov. 10, 2000 and entitled MEDIA CONTROL VALVE.
- 1. Field of the Invention
- The present invention is related to media control and, more specifically, media control valves used to control the flow of a media into a fluid stream as part of an apparatus for treatment of a surface.
- 2. Description of the Related Art
- A typical media control valve is disclosed in U.S. Pat. No. 3,476,440 (“the '440 patent”), which is hereby incorporated by reference in its entirety. The valve of the '440 patent is attached to a media vessel and controls the flow of the media from the media vessel into a conduit containing a fluid stream. This conduit terminates in a nozzle. Fluid and media pass through the nozzle at high speed and are typically used to treat surfaces.
- Other uses for media control valves have been proposed. For example, U.S. Pat. No. 5,810,045 (“the '045 patent”) discloses a valve for introducing particulate materials into a high-pressure air stream and suggests several uses for this valve. For example, the '045 patent suggests that the valve may be used for purposes such as introducing fluid catalytic cracking catalyst particles into fluid catalytic cracking units used to crack and reform various petroleum based products, introducing particulate catalysts into other kinds of chemical processes, and spraying particulate ingredients on adhesive substrates as part of various manufacturing processes.
- Various improvements to the basic media control valve have been proposed. For example, U.S. Pat. Nos. 5,407,379 (“the '379 patent”) and 5,401,205 (“the '205 patent”) disclose a media control valve having a media passage between the media control valve and the conduit. The media passage converges into a slot-shaped outlet in the conduit so as to reduce the perimeter of the outlet placed perpendicular to air flow and consequently reduce turbulence as air passes across the outlet. The media control valve disclosed in the '205 and '379 patents is particularly useful in metering and dispensing sodium bicarbonate media.
- The '045 patent, discussed previously, also discloses a modification of the original media control valve, including the use of multiple seals around a plunger of the valve with an exhaust therebetween to remove any contaminants that breach the seals.
- According to one embodiment of the present invention, a media control valve is provided including a valve body having a media inlet and a media outlet, and a plunger and sleeve positioned within the valve body. The media control valve also includes a media opening in the sleeve having a first portion proximate to the media outlet and a second portion distal to the media outlet, wherein the second portion is broader than the first portion. The media control valve further includes a housing connected to the valve body, a piston positioned within the housing and connected to the plunger, and a base connected to the valve body in communication with the media outlet.
- According to another embodiment of the present invention, a valve is provided including a body having an opening and an outlet. The opening in the outlet includes a first portion proximate to the outlet and a second portion distal to the outlet, wherein the second portion is broader than the first portion. The valve further includes a closing member positioned within the body so as to selectively cover the opening.
- According to another embodiment of the present invention, a valve is provided including a body and a closing member positioned within the body. The valve also includes a housing and a piston within the housing. The piston is connected to the closing member and has a contaminant isolation region.
- According to another embodiment of the present invention, a media control valve is provided including a valve body having a media inlet and a media outlet, and a plunger and sleeve positioned within the valve body. The media control valve also includes a media opening in the sleeve, a housing connected to the valve body, a piston having a contaminant isolation region positioned within the housing and connected to the plunger and a base connected to the valve body in communication with the media outlet.
- According to another embodiment of the present invention, a media control system is provided including a media vessel, an air flow path, a media flow path, and a media control valve positioned on the media flow path. The media flow path has a substantially linear axis and includes a media inlet connected to the media vessel and a media outlet connected to the media flow path.
- According to another embodiment of the present invention, a media control valve is provided including a valve body comprising a media inlet and a media outlet, and means for providing a gentle seal positioned within the valve body. The valve also includes a sleeve positioned within the valve body, a media opening in the sleeve, a housing connected to the valve body, and a base connected to the valve body and in communication with the media outlet.
- The foregoing and other advantages of the present invention will be more fully appreciated with reference to the following drawings in which:
- FIG. 1 is a diagram of a blasting system incorporating the media control valve of the present invention;
- FIG. 2 is a cross-sectional side view of a media control valve according to an aspect of the present invention;
- FIG. 3 is an exploded, elevational view of the valve shown in FIG. 2;
- FIG. 4 is a side elevational view of a sleeve according to one embodiment of the present invention;
- FIG. 5 is an illustration of example embodiments of a media opening according to the present invention;
- FIG. 6 is a perspective view of the sleeve illustrated in FIG. 4 with phantom lines to show relative thickness;
- FIG. 7 is a bottom plan view of the sleeve illustrated in FIG. 4 with phantom lines to show relative thickness;
- FIG. 8 is a cross-sectional side view of the sleeve illustrated in FIG. 4, taken along section line8-8 of FIG. 7;
- FIG. 9 is a top plan view of a plunger according to one embodiment of the present invention;
- FIG. 10 is a cross-sectional side view of the plunger illustrated in FIG. 9, taken along section line10-10 of FIG. 9;
- FIG. 11 is a cross-sectional side view of a media control valve according to an aspect of the present invention;
- FIG. 12 is an exploded, elevational view of the valve shown in FIG. 11; and
- FIG. 13 is a partial side view of one aspect of the present invention.
- The present invention is directed to a valve for controlling the flow of a media to a fluid stream, referred to herein as a media control valve. By media, it is meant any material or materials that may be desired to be added to another material or materials. While various solid, fine particulate, blasting media, such as sand, metal shot, and the like, are used by way of example herein, the media that may be supplied by the media control valve of the present invention is not so limited, and may include a wide variety of materials including liquids and gasses as well as solid particles.
- In one embodiment, the media control valve of the present invention includes a valve body having a media inlet and a media outlet. A housing is connected to the valve body. A plunger is positioned within the valve body and is connected to a piston positioned within the housing. A base is connected to the valve body such that it communicates with the media outlet. The media control valve of this embodiment may further include a sleeve disposed between the valve body and the plunger. This sleeve may contain a media opening. In some embodiments of the media control valve of the present invention, the media opening has a first portion proximate to the media outlet and a second portion distal to the media outlet, the second portion being broader than the first portion. In other embodiments of the invention, the piston includes a contaminant isolation region. These and other specific embodiments of the invention will now be described with reference to the Figures.
- FIG. 1 illustrates a typical system in which the media control valve of the present invention may be employed. In FIG. 1, a
media control valve 10 is part of ablast system 150 used to treat a surface by projecting amedia 140 at the surface.Media 140 typically consists of solid particles, such as sand, shot, nut shells, sodium bicarbonate, other abrasives, and the like depending on the surface being treated and the materials(s) being removed from the surface.Blast system 150 includes afluid supply 100 which supplies a fluid stream throughconduit 110. Typically, the fluid employed is air, though any readily available, relatively inert carrier fluid may be employed.Media 140 may be stored in amedia vessel 130 and supplied to the fluid stream withinconduit 110 through actuation ofmedia control valve 10. The fluid stream and entrainedmedia 140 then pass throughconduit 110 to anozzle 120 where they are directed at a surface to be treated. - Referring now to FIGS. 2 and 3, in one embodiment
media control valve 10 may include avalve body 20 having amedia inlet 22 and amedia outlet 24. Aplunger 30 is positioned withinvalve body 20 and asleeve 32 is positioned betweenvalve body 20 andplunger 30.Sleeve 32 may include amedia opening 34 that allows media to pass frommedia inlet 22 tomedia outlet 24 whenplunger 30 is not blocking such flow. In this embodiment,media control valve 10 further includes ahousing 40 that is connected tovalve body 20. Apiston 42 is connected toplunger 30 and positioned withinhousing 40. Abase 60 is connected tovalve body 20 such that it communicates withmedia outlet 24. -
Valve body 20 may be constructed in any manner and of any materials that providevalve body 20 the desired configuration and durability. For example,valve body 20 may be constructed withmedia inlet 22.Media inlet 22 may be constructed in any manner that allows it to receive media. For example,media inlet 22 may be constructed to connect to a media vessel. Whenmedia inlet 22 is constructed to connect with a media vessel, it may be constructed to connect in any manner that provides a secure connection and allows media to flow intovalve body 20 from the media vessel. For example,media inlet 22 may be threaded, or otherwise provided with a fitting such that it may mate with a connector attached to the media vessel. -
Valve body 20 may also be constructed withmedia outlet 24.Media outlet 24 may be constructed in any manner that allows media to pass fromvalve body 20 into afluid passage 62 withinbase 60. For example,media outlet 24 may be an aperture of any size and shape capable of delivering media in an adequate volumetric flow through a conduit, and, most typically, to a blast nozzle. In preferred embodiments,media outlet 24 may be shaped as a circular hole. -
Valve body 20 may also be constructed tohouse plunger 30.Valve body 20 may include an open area having a shape corresponding toplunger 30.Valve body 20 may also be constructed to allowsleeve 32, seals 36 orseat 26 to reside withinvalve body 20. For example, the opening invalve body 20 for receivingplunger 30 may be large enough to also accommodatesleeve 32 orseals 36 betweenplunger 30 andvalve body 20. Similarly,valve body 20 may include a portion shaped to accommodateseat 26, typically adjacent tomedia outlet 24. -
Valve body 20 may also be constructed with a mechanism for allowing the media to pass out of the media vessel without passing into the conduit. For example,valve body 20 may include a bypass orcleanout 28.Cleanout 28 may be constructed in any manner which allows the media to flow out of the media vessel without entering the conduit. For example,cleanout 28 may include an opening invalve body 20 communicating directly withmedia inlet 22. Typically during operation ofmedia control valve 10,cleanout 28 is closed.Cleanout 28 may also include an opening onto which a cover may be mated when it is desired to closecleanout 28. -
Valve body 20 may be constructed of any material or materials that have sufficient durability forvalve body 20 and are compatible with media and other materials which may come in contact withvalve body 20. For example,valve body 20 may be constructed of various metals and metal alloys. Preferably,valve body 20 is constructed of an aluminum alloy because of its relatively low weight and cost and relatively high strength and abrasion resistance. Preferably, the aluminum alloy has a hard-coat anodized finish to improve its abrasion resistance. In one embodiment,valve body 20 is constructed of 356 T6 aluminum alloy with a hard-coat anodized finish. -
Valve body 20 may be constructed by any method capable of producingvalve 20 from a desired material or materials of construction. For example, wherevalve body 20 is constructed of certain metals,valve body 20 may be cast, machined or both. Preferably,valve body 20 is constructed by casting, and, more preferably, investment casting, because casting is relatively inexpensive and produces a relatively high quality product having sufficient dimensional stability. - Referring now also to FIGS. 9 and 10,
plunger 30 may be constructed in any manner and using any materials resulting inplunger 30 having the shape and durability to selectively prevent flow of media throughvalve body 20. For example,plunger 30 may be constructed in any shape that may mate withvalve body 20,sleeve 32 and seals 36 to selectively prevent flow of media frommedia inlet 22 tomedia outlet 24. In order to selectively prevent flow of media,plunger 30 is typically constructed such that it may move withinvalve body 20, selectively exposing amedia opening 34 insleeve 32 and allowing the media to flow frommedia inlet 22 tomedia outlet 24. Preferably,plunger 30 is cylindrical and of uniform cross-section. -
Plunger 30 may be constructed to mate withpiston 42. For example,plunger 30 may be threaded at one end, such that it may be mated topiston 42 with a threadednut 70. Alternatively,plunger 30 may thread directly intopiston 42 or be connected with another connector known to those of skill in the art. -
Plunger 30 may be constructed of any material or materials that are sufficiently durable and inert to selectively prevent the passage of media through orpast plunger 30 and to provide long life ofplunger 30. For example,plunger 30 may be constructed of the same material or materials asvalve body 20. However, asplunger 30 may be subject to more wear thanvalve body 20, it is preferred to constructplunger 30 of a more durable material thanvalve body 20. For example,plunger 30 may be constructed of steel, such as 304 stainless steel, with harder material, such as tungsten carbide, on the outer,lower portion 31 ofplunger 30. These materials are selected due to their relatively high strength and dimensional stability.Plunger 30 may be made by any conventional method to produce the desired shape from the material or materials of construction. For example,plunger 30 may be constructed by the same method asvalve body 20. - Referring now also to FIGS.4-8,
Sleeve 32 may be constructed in any manner and of any materials to produce a desired configuration to be contained withinvalve body 20 and to mate withplunger 30. For example,sleeve 32 may be constructed as a cylindrical annulus whereplunger 30 is cylindrical andvalve body 20 contains a cylindrical opening therein.Sleeve 32 may be constructed with amedia opening 34 to control the flow of media frommedia inlet 22 tomedia outlet 24.Media opening 34 may be constructed in any shape that controls the flow ofmedia 140 frommedia inlet 22 tomedia outlet 24 as desired whenvalve 10 is open. For example, as illustrated in FIG. 5,media opening 34 may be irregularly shaped, or, more conventional, with a circular, elliptical, or other geometric shaped opening; alternatively it may only include a narrow opening. Preferably, as illustrated in FIGS. 4 and 6,media opening 34 includes a first portion 200 proximate tomedia outlet 24 and a second portion 202 distal tomedia outlet 24, second portion 202 being broader than first portion 200. This embodiment ofmedia opening 34 facilitates metering particulate media whenmedia valve 10 is in a partially open position. - In some embodiments, the flow control function of
media opening 34 insleeve 32 may be constructed directly intovalve body 20. For example,valve body 20 may be constructed in a manner which is equivalent tosleeve 32 being fused tovalve body 20. However, it is preferable to have aseparate sleeve 32 because this allows relatively straightforward modification ofmedia opening 34, and, thus, the flow properties ofmedia control valve 10, and becausesleeve 32 may be subject to wear and may need periodic replacement. -
Sleeve 32 may be formed out of any material that may be shaped as desired and provides sufficient durability. For example,sleeve 32 may be formed of a material that may maintain the shape ofmedia opening 34 despite the passage ofmedia 140 throughmedia opening 34 over time. In some embodiments,sleeve 32 may be constructed of a metal, metal alloy or polymer. Preferably,sleeve 32, likeplunger 30, is constructed of steel with tungsten carbide on the surfaces subject to the most wear, such as the inner,lower portion 35 ofsleeve 32. Again, these materials are selected due to their abrasion resistance and dimensional stability. However, it should be understood that the preferred material of construction forsleeve 32 may vary with the media used and, in other embodiments, other materials may be preferred. For example, in some embodiments, it is preferred to formsleeve 32 from urethane because of its cost, serviceability and resistance to jamming with certain media, such as steel shot.Sleeve 32 may be constructed by any method that producessleeve 32 having the desired shape and durability out of the material or materials of construction. For example,sleeve 32 may be constructed by sintering, casting or molding and polymerization of a prepolymer. - One or
more seals 36 may be positioned betweenplunger 30 andvalve body 20 to prevent media, fluid from the conduit or other contaminants from passing betweenvalve body 20 andhousing 40. In a preferred embodiment, threeseals 36 are positioned betweenplunger 30 andvalve body 20 to prevent contamination. Typically, the likelihood of contamination is much greater fromvalve body 20 tohousing 40 than the reverse. Accordingly, seals 36 are typically oriented to facevalve body 20. In some instances, such as where the pressure withinhousing 40 may exceed the pressure withinvalve body 20, one or more ofseals 36 may be oriented to facehousing 40. In such instances, it is preferred that seals 36 closest tohousing 40 be faced towardhousing 40. In one embodiment,several seals 36 are formed as a unitary structure. For example, three seals may be formed as a single solid piece of material. -
Seals 36 may be formed out of any material that will provide an adequate seal with sufficient durability. For example, seals 36 may be formed of a resilient, pliable material, such as some polymers. The material may also be abrasion resistant and have a low coefficient of friction. In some instances, seals 36 may be constructed of an elastomer. Preferably, seals 36 are constructed of molythane because it is self-lubricating or urethane because of its abrasion resistance.Seals 36 may be constructed by any method that producesseals 36 having the desired seal and durability out of the material or materials of construction. For example, seals 36 may be constructed by molding and polymerization of a prepolymer. -
Seat 26 may be constructed of any material or materials and in any manner that produces a solid connection withplunger 30 when media controlvalve 10 is in a closed position. For example,seat 26 may be constructed to fit snugly withplunger 30. In embodiments whereplunger 30 is cylindrical,seat 26 may be a circular annulus.Seat 26 may be constructed of the same materials and using the same methods as seals 36.Seat 26 may also be constructed of less resilient materials than would typically be used forseals 36 and may even be formed of the same material asvalve body 20. -
Housing 40 may be constructed in any manner and of any material or materials that producehousing 40 that may be connected tovalve body 20,house piston 42 and have sufficient durability. For example,housing 40 may be constructed to function as a cylinder forpiston 42. Preferably, the inside ofhousing 40 is a uniform circular cylinder, however, this is not required as long as the inside ofhousing 40 connects withpiston 42 to provide a seal.Housing 40 may be constructed such thatpiston 42 may travel withinhousing 40. Preferablypiston 42 has sufficient range of motion to allowplunger 30 to move from a fully open position in which plunger 30 does not obstructmedia opening 34 to a fully closed position in which plunger 30 rests againstvalve seat 26, completely obstructing flow throughmedia opening 34.Piston 42 may effectively dividehousing 40 into adrive chamber 44 and anexhaust chamber 46. Wherehousing 40 has adrive chamber 44,housing 40 may be constructed with adrive inlet 48 to drivechamber 44, allowing pressure to be applied topiston 42 to openmedia control valve 10. -
Housing 40 may also include one ormore vents 50 inexhaust chamber 46, allowing fluid to flow into and out ofexhaust chamber 46 as the volume withinexhaust chamber 46 varies with the motion ofpiston 42.Vents 50 may includefilters 52 to prevent contaminants from enteringhousing 40 while still allowingvents 50 to perform their exhaust function. Preferably, filters 52 invents 50 are capable of filtering particles larger than about 20 microns as this filters most particles, but does not restrict the flow of fluid throughvents 50 enough to significantly affect performance ofmedia control valve 10. Furthermore, particles less than about 20 microns may be able to fit betweenhousing 40 andpiston 42 and are less likely to damagepiston 42 orcause piston seal 58 to fail. Asuitable filter 52 may be constructed by sintering an appropriate material, such as a metal of metal alloy. Preferably the filter is constructed of sintered brass. -
Housing 40 may be constructed to provide access to the inside ofhousing 40. For example,housing 40 may include acap 66, which may be removed to provide access to the inside ofhousing 40.Cap 66 may be constructed in any manner that allows it to connect securely withhousing 40 yet allows access to the inside ofhousing 40. For example, cap 66 may be constructed to cover the open top ofhousing 40, and may include structure allowing it to be connected tohousing 40. In one embodiment,cap 66 andhousing 40 may include matching holes, through whichbolts 68 may be inserted to securecap 66 tohousing 40. Preferably, in order to insure a secure connection, four evenly spaced bolt holes 64 andbolts 68 are used to securecap 66 tohousing 40.Cap 66 may be constructed of the same materials and by the same method ashousing 40. -
Housing 40 may also be constructed to include structure to allow the adjustment of the operation ofmedia valve 10. For example,housing 40 may enclose aspring 56 and attendant structure to adjust the tension onspring 56 and, thus, the operation ofmedia control valve 10. Alternatively,housing 40 may include an air shock (not shown) and attendant structure. In one embodiment,spring 56 rests betweenpiston 42 andcap 66, biasingpiston 42 andplunger 30 towardmedia outlet 24 and thus biasingmedia control valve 10 into a closed position. The tension onspring 56 may be used to control how difficult it is to movepiston 42, and thus, the amount of pressure required to actuatemedia control valve 10 or the degree of actuation for a given pressure. Structure to adjust the tension onspring 56 may include aspring retainer 80 that mates withhousing 40. Wherespring retainer 80 is used to allow the tension onspring 56 to be adjusted, a device for facilitating the adjustment ofspring retainer 80, such as aknob 82, crank or other handle, may be used. An O-ring 84, or like seal, may be positioned betweenspring retainer 80 andhousing 40, to prevent the ingress of contaminants intohousing 40.Media control valve 10 may include a metering indicator. For example,spring retainer 80 may include marking corresponding to the degree to which media controlvalve 10 is open. -
Housing 40 may be constructed of any material or materials that may be shaped in the desired configuration and has sufficient durability to provide long life. For example,housing 40 may be constructed of the same materials asvalve body 20. Similarly,housing 40 may be constructed using the methods discussed with respect tovalve body 20. -
Piston 42 may be constructed in any manner and using any materials that allow it to fit snugly withinhousing 40 and to connect withplunger 30 such thatplunger 30 is moved with the motion ofpiston 42. For example,piston 42 may relatively flat and shaped to match the cross-section ofhousing 40. Typically,piston 42 will be circular to match the circular cross-section ofcylindrical housing 40.Piston 42 may be constructed with structure to connect it toplunger 30. For example, whereplunger 30 includes a threaded region,piston 42 may have a hole therein through which a portion ofplunger 30 is inserted, andnut 70 threaded onto, to attachpiston 42 toplunger 30. -
Piston 42 may be constructed with structure to insure that fluid, media, contaminants and other materials are prevented from passing betweendrive chamber 44 andexhaust chamber 46 ofhousing 40. For example,piston 42 may be constructed with one or more retainers adapted to maintain apiston seal 58 in place aroundpiston 42. -
Piston 42 may be constructed to reduce the adverse effect of media and other contaminants that find their way intodrive chamber 44. For example,piston 42 may include acontaminant isolation region 48 where contaminants are collected and isolated from more sensitive areas ofmedia control valve 40, such as the walls ofhousing 40 andpiston seal 58. In one embodiment,contaminant isolation region 48 includes a recess inpiston 42. In this embodiment,piston 42 may have an overall dish shape, allowing contaminants to settle into the dish. -
Piston 42 may be constructed of any material or materials that provide sufficient rigidity and durability. For example,piston 42 may be constructed of a metal, metal alloy or polymer. Preferably,piston 42 is constructed of aluminum because of its relatively high strength and relatively low cost and weight. More preferably,piston 42 is constructed of 356 T6 aluminum.Piston 42 may be hard-coat anodized.Piston 42 may be constructed by any method that producespiston 42 from the desired material or materials of construction, such as casting, machining or molding. - In some embodiments, structure to prevent
piston 42 from impacting againsthousing 40 orcap 66 may be included inmedia control valve 10. For example, structure may be positioned withinhousing 40 to absorb the impact ofpiston 42striking housing 40 orcap 66. In one embodiment, this structure may comprise a bumper, such asbump ring 86, capable of absorbing the impact ofpiston 42 striking it.Bump ring 86 may be constructed in any manner and of any material or materials that allow it to interceptpiston 42 and to dissipate some of its impact energy. For example,bump ring 86 may be constructed as an elastomeric ring and made by a method suitable to the material. Preferably,bump ring 86 is constructed from neoprene because of its impact absorbing ability. - While a conventional piston is described by way of example herein, it should be understood that
piston 42 may also be constructed as a diaphragm. Wherepiston 42 is constructed as a diaphragm, it may be constructed such that it is connected at its edges tohousing 40, but is free to move in a central portion connected toplunger 30. For example,piston 42 may be constructed of a flexible material, which may be an elastomer. Such material may be selected based on its degree of flexibility and its ability to withstand repeated flexing over an extended period of operation ofmedia control valve 10. - In some instances,
media control valve 10 may be subject to significant vibration, for example, due to a mechanical agitator operated to improve media flow. Vibration is undesirable because it may, for example, result in a change in metering position. Accordingly, it may be desired to add structure tomedia control valve 10 that dampens vibration. For example, a structure capable of absorbing vibrational energy or adding friction to prevent parts from vibrating apart may be included inmedia control valve 10. In one embodiment, avibration disc 88 is positioned betweenspring 56 andspring retainer 80 to create friction and prevent slipping ofspring retainer 80, potentially resulting in a loss of metering position.Vibration disc 88 may be constructed in any manner and of any material or materials that allow it create friction between two parts. However,vibration disc 88 should not create so much friction that it prevents adjustment or detachment of the parts. For example,vibration disc 88 may be circular, polygonal or of any other shape and may be formed of any material having a relatively high coefficient of friction. Typically,vibration disc 88 is formed of a polymeric material. Preferably,vibration disc 88 is constructed of polyurethane because it may create friction without preventing adjustment. -
Base 60 may be constructed in any manner and of any materials that allow communication betweenmedia outlet 24 andfluid passage 62. For example,base 60 may be adapted to be attached tovalve body 20 andconduit 110, such thatfluid passage 62 is in communication with bothmedia outlet 24 andconduit 110. Typically, an opening inbase 60 is placed in communication withmedia outlet 24, allowing media to pass intofluid passage 62. Wherebase 60 is in communication withmedia outlet 24, it is preferred that the opening betweenbase 60 andmedia outlet 24 not impede the flow of media intofluid passage 62 or the ability ofplunger 30 to closemedia control valve 10. For example, the opening betweenmedia outlet 24 andgas passage 62 may be larger thanmedia opening 34 insleeve 32, ensuring that it is not the flow-limiting restriction and allowing media to disperse, making it easier forplunger 30 to move the media aside as it closes. -
Base 60 may be constructed with structure allowing it to be connected tovalve body 20. Thestructure allowing base 60 to be attached tovalve body 20 may be integrally formed withbase 60, allowingbase 60 to be unitary structure. This embodiment is in contrast to typical media control valve bases wherein the base consists of several pieces, such as aseparate fluid passage 62 and attachment structure for attachingfluid passage 62 tovalve body 20. - In one embodiment,
base 60 may include bolt holes 64 through whichbolts 68 may be passed to connectbase 60 tovalve body 20. Preferably, bolt holes 64 extend not only throughbase 60 but also throughvalve body 20 and intohousing 40. Where bolt holes 64 extend throughbase 60 andvalve body 20 intohousing 40, removingbolts 68 allowsmedia control valve 10 to be quickly disassembled for inspection, modification or maintenance. For example,bolts 68 may be removed to allow access to and replacement ofsleeve 32, such thatsleeve 32 may be replaced with analternate sleeve 32 having adifferent media opening 34. As another example,bolts 68 may be removed to provide access toseals 36 for routine maintenance and repair. Preferably,base 60,valve body 20 andhousing 40 each include four corresponding bolt holes evenly distributed about such structures to provide a secure connection therebetween.Housing 40 andvalve body 20 may include further mating structure that facilitates the attachment ofhousing 40 andbody 20. For example, one ofhousing 40 andvalve body 20 may include agrove 38 orprotrusion 54 that mates with a correspondinggroove 38 orprotrusion 54 in the other one ofhousing 40 andvalve body 20. -
Base 60 may be constructed of any material that may be shaped in the desired configuration and has sufficient durability to provide long life. For example,base 40 may be constructed of various metals or metal alloys. In a preferred embodiment,base 60 is constructed of carbon steel, such as 4140 carbon steel, because of its strength, cost, and ability to be hardened and cast. Wherebase 60 is constructed of carbon steel, it may be heat treated, for example, to approximately 55 Rockwell C, and may be phosphate coated to inhibit rusting.Base 40 may be constructed using the methods discussed with respect tovalve body 20. - In some embodiments,
fluid passage 62 may be subject to mechanical or chemical damage. Accordingly, structure may be added tofluid passage 62 to resist such damage. For example, a flow sleeve (not shown) may be positioned withinfluid passage 62. The flow sleeve may be constructed of any material that is sufficiently chemically and/or mechanically resistant. For example, the flow sleeve may be constructed of polyurethane by conventional techniques. - An alternate embodiment of a
media control valve 10 of the present invention is illustrated in FIGS. 11-12. This embodiment serves as an example of another of the variety of valve structures within the scope of the present invention and illustrates other features that may be incorporated into the media control valves of the present invention. - One common wear point in conventional valves is
seat 26. Traditional plungers have sharp edges where the side of the plunger meets the end of the plunger (typically at right angles). It has been discovered that this sharp edge leads to the degradation of the valve seat. Accordingly, one embodiment ofmedia control valve 10 provides a gentle seal. By gentle seal, it is meant a seal in which there are no sharp edges forced against the seat when the valve is closed. Such an embodiment is illustrated in FIGS. 11 and 12. - In one embodiment, a gentle seal may be provided by any structure on
plunger 30 orseat 26 that does not provide a hard or sharpedge abutting seat 26. For example, the end ofplunger 30 may be rounded or beveled, or may include a rounded or beveled structure attached thereto. In one embodiment, the entire end ofplunger 30 is beveled or rounded. In another embodiment, just the edges ofplunger 30 are rounded or beveled. As illustrated in FIG. 13, whereplunger 30 is beveled, thebevel angle 100 may be less than about 60 degrees with respect to aplane 98 defined by the end ofplunger 30. In other embodiments,bevel angle 100 may be less than about 45 degrees, less than about 30 degrees, or less than about 15 degrees. - Where a gentle seal is provided,
seat 26 may be as described previously and is preferably a flexible material, such as polyurethane, which may improve the seal.Seat 26 may also be constructed to facilitate formation of a gentle seal. For example,seat 26 may be shaped to mate withplunger 30, having a curved or beveled edge at its opening, or the like. - Conventional media control valves, and even the valve of the embodiment of the invention illustrated in FIGS. 2 and 3, include a media flow path that causes media to change direction and thus impact against it as it passes through the path. By media flow path, it is meant a path between
media inlet 22 andmedia outlet 24 through which media passes whenvalve 10 is open. It has now been recognized that because of the impact between the media and the media flow path, the media flow path may be degraded. Furthermore, the flow of media may be slowed and impeded by the contact. Accordingly, in one embodiment, the present invention is directed to amedia control valve 10 having aflow path 92 designed to reduce impact with the media. For example, as illustrated in FIG. 11,flow path 92 may have a substantiallylinear axis 96.Media flow path 92 having substantiallylinear axis 96 may be free of bends, crooks, and the like, such that media may flow directly frommedia vessel 130 intofluid path 62 with little or no contact withmedia flow path 92. Reduction of contact betweenmedia flow path 92 and the media may be facilitated by orientingmedia flow path 92 substantially perpendicularly with respect to the surface upon which the media control system rests. However, such and arrangement is not required, particularly where the flow of media is primarily due to a pressure differential rather than to gravitational forces.Media flow path 92 may be oriented substantially perpendicularly with respect tofluid path 62, which, in most embodiments, will be an air flow path. It should be appreciated that some contact betweenmedia flow path 92 and the media is largely unavoidable. For example, contact may occur because of scattering of the media or narrowing ofmedia flow path 92. Nonetheless, to the extent that impact is reduced by straightening ofmedia flow path 92, such an arrangement is within the scope of the present invention. - To facilitate alignment of
sleeve 32 such thatmedia opening 34 is properly oriented, structure may be included onsleeve 32 and/orvalve body 20. For example, a mating structure such as a ridge and groove, pin and hole, or the like, may be used to facilitate proper alignment. In the embodiment illustrated in FIGS. 11 and 12, aseparate sleeve pin 90 is designed to mate with corresponding holes invalve body 20 andsleeve 32. - The illustrative embodiment of FIGS. 11 and 12 demonstrates that
media control valve 10 according to the present invention may be constructed relatively simply and, where desired, may be of small size. Such an embodiment may be preferred, for example, in applications where a small, simple valve may be desired to decrease cost or to increase portability. To makemedia control valve 10 smaller, simpler and less expensive, it may be constructed as an on-off valve, meaning that it has only fully open and fully closed positions. In such an on-off valve, flow control may be accomplished by changing the size ofmedia opening 34 or the pressure differential across the valve. In addition to the improvements already noted, this embodiment includes aplunger 30 capable of also functioning as a piston inhousing 40, lowering cost and improving serviceability. This embodiment, as any embodiment of the present invention, may be constructed of the materials and in the manner previously described herein. - It should be appreciated that the features of the embodiment of the invention illustrated in FIGS. 11 and 12 and the embodiment illustrated in FIGS. 2 and 3 are interchangeable and may be combined or interchanged with other features of conventional media control valves. For example, the use of a
media opening 34 having a narrower and a broader portion may be accommodated in the embodiment illustrated in FIGS. 11 and 12. Similarly, the use of amedia flow path 92 having a substantiallylinear axis 96 may be desirable in the embodiment illustrated in FIGS. 2 and 3. - Having thus described certain embodiments of the present invention, various alterations, modifications and improvements will be apparent to those of ordinary skill in the art. Such alterations, variations and improvements are intended to be within the spirit and scope of the present invention. Accordingly, the foregoing description is by way of example and is not intended to be limiting. The present invention is limited only as defined in the following claims and the equivalents thereto.
Claims (49)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/005,484 US20020083981A1 (en) | 2000-11-10 | 2001-11-08 | Media control valve |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/709,894 US6607175B1 (en) | 2000-11-10 | 2000-11-10 | Media control valve |
US10/005,484 US20020083981A1 (en) | 2000-11-10 | 2001-11-08 | Media control valve |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/709,894 Continuation-In-Part US6607175B1 (en) | 2000-11-10 | 2000-11-10 | Media control valve |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020083981A1 true US20020083981A1 (en) | 2002-07-04 |
Family
ID=24851718
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/709,894 Expired - Lifetime US6607175B1 (en) | 2000-11-10 | 2000-11-10 | Media control valve |
US10/005,484 Abandoned US20020083981A1 (en) | 2000-11-10 | 2001-11-08 | Media control valve |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/709,894 Expired - Lifetime US6607175B1 (en) | 2000-11-10 | 2000-11-10 | Media control valve |
Country Status (6)
Country | Link |
---|---|
US (2) | US6607175B1 (en) |
EP (1) | EP1339530A1 (en) |
AU (1) | AU2002220198A1 (en) |
CA (1) | CA2428378C (en) |
MX (1) | MXPA03004157A (en) |
WO (1) | WO2002038337A1 (en) |
Cited By (5)
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WO2013066370A3 (en) * | 2011-10-31 | 2013-08-15 | Nguyen Phuong Taylor | Media control valve |
CN103697225A (en) * | 2012-09-28 | 2014-04-02 | 昆山开信机械制造有限公司 | Digital closed-loop control shot flow valve for shot blasting |
WO2021035001A1 (en) * | 2019-08-21 | 2021-02-25 | Cold Jet, Llc | Particle blast apparatus |
US11484988B2 (en) * | 2017-01-27 | 2022-11-01 | Axxiom Manufacturing, Inc. | Dry wet blast media blasting system |
US11931864B2 (en) | 2022-10-20 | 2024-03-19 | Clementina Clemco Holdings, Inc. | Metering valve for abrasive media |
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US7959780B2 (en) | 2004-07-26 | 2011-06-14 | Emporia Capital Funding Llc | Textured ion exchange membranes |
US7094135B2 (en) * | 2004-08-10 | 2006-08-22 | International Waterjet Parts, Inc. | Abrasivejet cutting head with back-flow prevention valve |
US7780833B2 (en) | 2005-07-26 | 2010-08-24 | John Hawkins | Electrochemical ion exchange with textured membranes and cartridge |
CN101316794B (en) | 2005-10-06 | 2016-01-06 | 派克逖克斯公司 | The electrochemical ion of fluid exchanges process |
US7300336B1 (en) * | 2006-08-15 | 2007-11-27 | Phuong Taylor Nguyen | Media control valve |
US20080191157A1 (en) * | 2007-02-12 | 2008-08-14 | Phoung Taylor Nguyen | Modular media control valve |
US8057279B2 (en) * | 2007-05-17 | 2011-11-15 | Connelly William J | Abrasive blasting system with remote flow control and method |
DE102007037220A1 (en) * | 2007-08-07 | 2009-02-12 | Robert Bosch Gmbh | magnetic valve |
US20090057592A1 (en) * | 2007-08-28 | 2009-03-05 | Lakhan Haresh C | Flow control and closure valve with axial flow in the valve element |
DE102008015415B4 (en) * | 2008-03-20 | 2012-08-23 | Thyssenkrupp Bilstein Suspension Gmbh | Damping valve for a hydraulic vibration damper |
DE102008015416B4 (en) * | 2008-03-20 | 2012-10-11 | Thyssenkrupp Bilstein Suspension Gmbh | Damping valve for a hydraulic vibration damper |
US20120255633A1 (en) * | 2011-04-07 | 2012-10-11 | Phoung Taylor Nguyen | Modular Media Control Valve |
US20130009084A1 (en) * | 2011-07-09 | 2013-01-10 | Phuong Taylor Nguyen | Modular Media Control Valve |
US8961271B2 (en) * | 2011-09-06 | 2015-02-24 | Reco Atlantic, Llc | Abrasive blasting apparatus for remotely activating and modulating flow of abrasive blasting material |
US9194291B2 (en) * | 2012-08-24 | 2015-11-24 | Hamilton Sundstrand Corporation | Turbomachine windmill bypass valve |
US9291094B2 (en) | 2014-05-05 | 2016-03-22 | Dayco Ip Holdings, Llc | Variable flow valve having metered flow orifice |
US9446501B2 (en) | 2014-12-31 | 2016-09-20 | Spirit Aerosystems, Inc. | Method and apparatus for abrasive stream perforation |
WO2018090075A1 (en) * | 2016-11-18 | 2018-05-24 | Abrasive Blasting Service & Supplies Pty Ltd | Media control valve |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013066370A3 (en) * | 2011-10-31 | 2013-08-15 | Nguyen Phuong Taylor | Media control valve |
CN103697225A (en) * | 2012-09-28 | 2014-04-02 | 昆山开信机械制造有限公司 | Digital closed-loop control shot flow valve for shot blasting |
US11484988B2 (en) * | 2017-01-27 | 2022-11-01 | Axxiom Manufacturing, Inc. | Dry wet blast media blasting system |
WO2021035001A1 (en) * | 2019-08-21 | 2021-02-25 | Cold Jet, Llc | Particle blast apparatus |
CN114269480A (en) * | 2019-08-21 | 2022-04-01 | 冷喷有限责任公司 | Particle spraying device |
US11931864B2 (en) | 2022-10-20 | 2024-03-19 | Clementina Clemco Holdings, Inc. | Metering valve for abrasive media |
Also Published As
Publication number | Publication date |
---|---|
EP1339530A1 (en) | 2003-09-03 |
WO2002038337A1 (en) | 2002-05-16 |
AU2002220198A1 (en) | 2002-05-21 |
US6607175B1 (en) | 2003-08-19 |
CA2428378C (en) | 2014-06-17 |
CA2428378A1 (en) | 2002-05-16 |
MXPA03004157A (en) | 2004-12-02 |
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