CN103201548B - Pressure compensated valve - Google Patents

Pressure compensated valve Download PDF

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Publication number
CN103201548B
CN103201548B CN201180044057.6A CN201180044057A CN103201548B CN 103201548 B CN103201548 B CN 103201548B CN 201180044057 A CN201180044057 A CN 201180044057A CN 103201548 B CN103201548 B CN 103201548B
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CN
China
Prior art keywords
piston
valve
pressure
pressure compensation
fluid
Prior art date
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Expired - Fee Related
Application number
CN201180044057.6A
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Chinese (zh)
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CN103201548A (en
Inventor
R.施图德
S.格尔弗特
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Norgren GmbH
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Norgren GmbH
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Publication of CN103201548A publication Critical patent/CN103201548A/en
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Publication of CN103201548B publication Critical patent/CN103201548B/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • 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
    • F16K31/1223—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being acted upon by the circulating fluid
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/12—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with streamlined valve member around which the fluid flows when the valve is opened
    • F16K1/123—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with streamlined valve member around which the fluid flows when the valve is opened with stationary valve member and moving sleeve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4289—Valve constructions or configurations, e.g. arranged to reduce blowing fluid consumption

Abstract

A valve (200) including a housing (201) and a process fluid supply port (112) formed in the housing (201) to receive a process fluid is provided. The valve (200) includes a piston (202) movable within the housing (201) between an open position and a closed position. The piston (202) includes a first pressure-compensating surface (315) in fluid communication with the process fluid supply port (112) when the piston (202) is in the open position. The piston (202) further includes a second pressure-compensating surface (316) with a first portion (210) in fluid communication with the process fluid supply port (112) when the piston (202) is in the open and the closed position and a second portion (208, 317) in fluid communication with the process fluid supply port (112) when the piston (202) is in the open position.

Description

Pressure-compensated valve
Technical field
The present invention relates to valve, and relate more specifically to the pressure-compensated valve of improvement.
Background technique
Blowing is the well-known processes for preform members being molded as expected product.Performing member is the general shape being in pipe, and wherein one end is unlimited to introducing superheated steam, normally air; But, other fluid can be used.A typical types of blowing is stretch-blow (SBM).In SBM application, valve block provides low pressure and pressurized gas to be expand in mold cavity by performing member.Mold cavity comprises the external shape of expected product.SBM can be used in various application; But, be in the production of PETG (PET) product by the most widely used application, such as beverage bottle.Usually, SBM technique uses low pressure feed and stretching bar, and described stretching bar is inserted in performing member with in a longitudinal direction and this performing member and after this use high pressure supply to be expand in mold cavity by performing member of stretching radially outwardly.One or more blowing valve can be used to control low pressure and high pressure supply.The product obtained normally hollow, its profile is consistent with the shape of mold cavity.After this gas in performing member be discharged by one or more escape cock.This process is repeated in each blowing circulation.
As can be appreciated, due to the fair speed of mold cycle achieved at present, even the little increase of the energy in each mold cycle can cause the raising greatly of running cost.One of prime cost be associated with SBM system and whole blowing is used to the pressurized gas of expansion performing member.Required gas flow and the energy fluence of pressurization required for described gas may be significant.In addition, due to the high pressure required in low pressure and high pressure blow mold stage, require that the energy of remarkable quantity is to operate blowing valve at present, this is due to high pilot pressure requirement.
Such as, prior art blowing valve is possible or guide's actuating or electric actuation.Activate if blowing valve is all guide, so valve requires that large cross section carries out acting on or alternatively, requiring high pilot pressure for pilot fluid usually.If the cross section of valve is comparatively large, " footprint " of so this valve, the region namely occupied by this valve can increase the overall dimensions of valve block significantly.Alternatively, if valve is less by the cross sectional area of pilot pressure effect, so will require significantly higher pilot pressure, this causes the increase of running cost.
If on the other hand, blowing valve is electric actuation, such as solenoid-actuated valve, so powerful biasing member, and such as brute spring is exactly required to overcome the blow molding process hydrodynamic pressure acted on the sealing surfaces of this valve.Along with the increase of spring strength, solenoid increases too for the energy overcome required by spring force.The increase of this energy can increase the running cost of valve block significantly.
Fig. 1 shows the sectional view of a part for prior art blowing valve block assembly 100.Valve block assembly 100 comprises valve block housing 101, is arranged in the valve 102 of housing 101 and stretching bar 103.Although illustrate only a valve 102, it is appreciated that valve block assembly 100 generally includes more than one valve.Usually, the three or more valve similar with valve 102 is arranged in valve block assembly, and wherein the first valve provides low pressure feed to arrive performing member, and the second valve provides high pressure to be fed to performing member, and the 3rd valve is configured to discharge performing member.In some prior art valve block assemblies, also provide the 4th valve, it carries out recirculation to by a part for the gas in the product of molding during discharge phase.
Stretching bar 103 comprises elongate rod, and it extends through stretching rod aperture 104 and contacts performing member (not shown) when being extended, and this is well known in the art.The position of stretching bar 103 can be controlled by independent equipment (not shown), this in SBM industry be know and be unessential for the understanding of the present invention.
Each valve 102 is configured to the flow of pressurized gas controlling into and/or go out performing member, thus carries out molding to performing member and discharged from performing member by gas at the end of mold cycle.In order to control flow of pressurized gas, each valve 102 comprises moveable piston 105.Moveable piston 105 is positioned in control chamber 106.Control chamber 106 is adapted to pass through pilot pressure port 107 and receives pilot pressure.Pilot pressure acts on piston 105 to be moved up as shown in figure by piston 105.Control chamber 106 also comprises ventilated port 108, and it stops the formation vacuum when piston 105 moves in control chamber 106.
As shown, piston 105 also comprises the piston rod 109 extended from piston 105.Piston rod 109 comprises sealing surfaces 110, and it is suitable for being sealed in when first pilot masterpiece is used on piston 105 on the valve seat 111 that is formed in body 101.
When valve 102 is in an open position, as shown in FIG. 1, process air is supplied by process air supply port 112.Process air can be advanced towards being formed in stretching bar 103 with the opening 113 be communicated with performing member.In other prior art valve block assembly, opening 113 can be formed between stretching bar 103 and stretching bar path 10 4.
In many prior art systems, process air is fed to valve block assembly 100 by with the pressure of about 40 bar (580psi).When valve 102 is opened, the pressure of 40 bar acts on whole sealing surfaces 110 substantially.In an example of prior art valve, sealing surfaces 110 comprises about 30mm(1.2 inch) diameter d 1, and piston 105 comprises about 50mm(2.0 inch) diameter d 2.When the process fluid of 40 bar acts on sealing surfaces 110, need to be greater than 2,827.44 N (635.63 lb f) power carry out cut-off valve.Activate if valve is guide, example is as directed, and so cut-off valve 102 just needs the pilot pressure supplied by pilot pressure port 107 of about 15 bar (218 psi) to cross diameter d 2act on piston 105.Therefore, not only the valve 102 of prior art occupies the space of significant quantity, therefore requires larger valve block assembly 100, and prior art valve 102 also requires that quite high pilot pressure carrys out operating valve 102.High pilot pressure is partly because require that pilot pressure overcomes the whole power set up by the process air acted on valve 102 substantially.The pilot pressure of this increase result in the remarkable increase of the running cost of valve block assembly 100.
Therefore, need a kind of valve in the art, it can reduce the running cost relevant to valve block assembly.In addition, also need a kind of valve in related domain, it can reduce the size of valve block assembly, the high pressure (40 bar) that simultaneous adaptation is often associated with blow molding applications.Instant invention overcomes these or other problem and achieve the progress in related domain.The invention provides a kind of pressure-compensated valve, it can reduce the region that occupied by this valve and reduce the required pilot pressure being delivered to the control chamber of this valve simultaneously.
Summary of the invention
According to The embodiment provides a kind of valve.This valve comprises housing and the process fluid be formed in this housing supplies port with receiving process fluid.According to embodiments of the invention, this valve is also included in this housing can the piston of movement between open and closed positions.According to embodiments of the invention, this piston be included in this piston in an open position time supply with described process fluid the first pressure compensation surface that port flow is communicated with.According to embodiments of the invention, this piston also comprises the second pressure compensation surface, its first portion supplies port flow with process fluid be communicated with when piston is in and opens and closes position, and its second portion is supplied port flow when piston is in an open position with process fluid and is communicated with.
According to a kind of method that The embodiment provides operating valve, this valve comprises piston, and this piston has the first and second pressure compensation surfaces and can move between open and closed positions in the housing.According to embodiments of the invention, the method comprising the steps of: supplied with pressurized process fluid to the first portion on the second pressure compensation surface so that piston is activated from closed position towards open position.According to embodiments of the invention, the method also comprises step: supplied with pressurized process fluid is surperficial to provide on piston towards the bias force of closed position to the first pressure compensation.According to embodiments of the invention, the method also comprises step: supplied with pressurised fluid to the first portion on the second pressure compensation surface of piston and second portion to provide towards the bias force of open position on piston, bias force wherein on the second pressure compensation surface is greater than the bias force on the first pressure compensation surface, so that piston is remained on open position.
aspect
According to an aspect of the present invention, valve comprises:
Housing;
Be formed in this housing with the process fluid of receiving process fluid supply port;
Can the piston of movement between open and closed positions in this housing, and this piston comprises:
First pressure compensation surface, it is supplied port flow when piston is in an open position with process fluid and is communicated with; And
Second pressure compensation surface, its first portion supplies port flow with process fluid be communicated with when piston is in and opens and closes position, and its second portion is supplied port flow when piston is in an open position with process fluid and is communicated with.
Preferably, the first portion on the second pressure compensation surface comprises pressure actuated antelabium.
Preferably, the second portion on the second pressure compensation surface comprises valve sealing surface and ramped surfaces.
Preferably, valve also comprises valve seal base portion, this valve seal base portion be connected to housing and comprise by described piston around part.
Preferably, valve seal base portion comprises valve seat, and valve seat is configured to substantially form fluid tight seal when piston is in the closed position with the piston sealing surface be formed on piston.
Preferably, valve also comprises the control chamber limited by housing and piston.
Preferably, valve also comprises pilot pressure port, and pilot pressure port to be formed in housing and to be communicated with control chamber fluid.
Preferably, valve also comprises pressure compensation chamber, and it is communicated with Process fluid outlet fluid when piston is in an open position and is communicated with process fluid port flow.
Preferably, the process fluid pressure in pressure compensation chamber provides the bias force along first direction on the surface at the first pressure compensation and provides the bias force along second direction on the surface at the second pressure compensation, and second direction is substantially contrary with first direction.
Preferably, housing comprises a part for the housing for blowing valve block assembly.
According to a further aspect in the invention, a kind of method of operating valve, this valve comprises piston, and this piston has the first and second pressure compensation surfaces and can move between open and closed positions in the housing, and described method comprises step:
Pressing technology fluid is fed to the first portion on the second pressure compensation surface to be activated from closed position towards open position by piston;
Supplied with pressurized process fluid is surperficial to provide towards the bias force of closed position on piston to the first pressure compensation; And
Supplied with pressurised fluid to the first portion on the second pressure compensation surface of piston and second portion to provide towards the bias force of open position on piston, bias force wherein on the second pressure compensation surface is greater than the bias force on the first pressure compensation surface, so that piston is remained on open position.
Preferably, the first portion on the second pressure compensation surface comprises pressure actuated antelabium.
Preferably, the second portion on the second pressure compensation surface comprises valve sealing surface and ramped surfaces.
Preferably, the method also comprises step: control chamber is pressurized to threshold pressure with by plunger actuation to closed position.
Preferably, the method also comprises step: supply process fluid when piston is in an open position to performing member.
Preferably, the method also comprises step: between the valve sealing surface of piston and valve seat, substantially form fluid tight seal when piston is in the closed position.
Accompanying drawing explanation
Fig. 1 shows the sectional view of a part for prior art blowing valve block.
Fig. 2 shows the sectional view of valve according to an embodiment of the invention.
Fig. 3 shows the sectional view of valve according to another embodiment of the present invention.
Fig. 4 shows the sectional view with a part for the blowing valve block of valve according to an embodiment of the invention.
Embodiment
Fig. 2-4 and description below depict concrete example, how to manufacture and use optimal mode of the present invention to instruct those skilled in the art.In order to instruct the object of the principle of the invention, some traditional aspects are simplified or omit.Those skilled in the art will recognize that the modification to these examples fallen in the scope of the invention.Those skilled in the art will recognize that feature described below can be combined to form multiple modification of the present invention in every way.So, the invention is not restricted to concrete example described below, but only limited by claim and equivalent way thereof.
Fig. 2 shows the sectional view of valve 200 according to an embodiment of the invention.According to discussion below, valve 200 can be suitable for being used together with the valve block assembly of blow-molding system, such as, be included in the valve block assembly 400 shown in the intrasystem Fig. 4 of SBM.Therefore, the valve 102 that valve 200 can be provided to providing in Fig. 1 improves.Therefore, some reference characters in Fig. 1 are used to illustrate how valve 200 can be comprised in valve block assembly 400 in the remaining part of this description.But, be included in the valve block assembly of SBM system although valve 200 is discussed as, such as, valve block assembly 400 shown in Fig. 4, it is appreciated that valve 200 can be comprised in other system.Therefore, the present invention should not be restricted to SBM application or blow molding applications.
According to embodiments of the invention, valve 200 comprises housing 201.It is appreciated that housing 201 can comprise a part for valve block housing such as shown in Figure 4 or comprise the independent housing that can be positioned at such as prior art housing 101.Alternatively, housing 201 can comprise independently assembly.According to embodiments of the invention, valve 200 also comprise can movement in housing 201 piston 202 and be connected to housing 201 and by piston 202 at least in part around valve seal base portion 203.According to embodiments of the invention, piston 202 can move between closed position (Fig. 2) and open position (Fig. 3).
According to embodiments of the invention, valve seal base portion 203 be also positioned in housing 201 at least partially.Although whole valve seal base portion 203 is shown as and is positioned in housing 201, it is appreciated that in other embodiments, a part for valve seal base portion 203 can be positioned in the outside of housing 201.In the illustrated embodiment, two sealing components 203a, 203b generally define fluid tight seal between valve seal base portion 203 and housing 201.It is appreciated that in other embodiments, a sealing component or the sealing component more than two can be provided.As shown in FIG. 2, the part 250 of valve seal base portion 203 extend into piston 202 and by piston 202 around.Therefore, piston 202 can comprise the part 251 of general hollow, and the part of hollow is suitable for the part 250 of receiving valve sealing base portion 203.
According to embodiments of the invention, valve 200 comprises control chamber 204.Control chamber 204 can be limited by housing 201 and piston 202 at least in part.More particularly, control chamber 204 can be limited by housing 201 and the piston area 205 being exposed to control chamber 204 at least in part.Control chamber 204 can comprise pilot pressure port 107, as shown in fig. 1.Pilot pressure port 107 is communicated with piston area 205 fluid of valve piston 202.Advantageously, when pilot pressure is provided to pilot pressure port 206 from pilot pressure supply (not shown), pilot pressure acts on to be biased along first direction by piston 202 on piston 202, and this is shown as in fig. 2 upwards towards closed position.According to embodiments of the invention, piston 202 comprises sealing component 215, and itself and housing 201 form fluid tight seal substantially with the pilot pressure in retentive control chamber 204.
Although it should be understood that the present invention is depicted as the valve comprising guide and activate according to an embodiment, in other embodiments, valve 200 can be electric actuation.Such as, piston 202 can use solenoid instead of pilot pressure to activate.Therefore, the present invention should not be restricted to the valve that guide activates.
According to embodiments of the invention, housing 201 also comprises process fluid supply port 112.Process fluid supply port 112 can receive the pressing technology fluid from process fluid supply (not shown), as explained above with reference to Fig. 1.As discussed above ground, be used in some embodiments of blow molding applications at valve 200, process fluid can be supplied by with the pressure of the most high or ultra mistake about 40 bar.Process fluid is air normally, but can comprise other fluid.
According to embodiments of the invention, valve 200 also comprises pressure compensation chamber 206, and it is communicated with Process fluid outlet 207 fluid and optionally supplies port 112 fluid with process fluid and is communicated with.Process fluid outlet 207 can be communicated with opening 113 fluid be formed in stretching bar 103, such as (see figure 4).Alternatively, Process fluid outlet 207 can lead to another parts (not shown), optionally provides pressing technology fluid by valve 200 to these another parts.
According to embodiments of the invention, piston 202 can activated with being less than the power activating prior art piston 105.This can cause lower pilot pressure or use less power (if this valve is electric actuation).In the embodiment illustrated in figure 2, piston 202 is in the closed position.According to embodiments of the invention, when the pilot pressure in control chamber 204 reaches threshold pressure, piston 202 can be moved to closed position.In closed position, the valve sealing surface 208 of piston 202 forms fluid tight seal with the valve seat 209 of valve seal base portion 203.In closed position, the process fluid being supplied to process fluid supply port 112 is stoped to arrive pressure compensation chamber 206 and Process fluid outlet 207 substantially.In certain embodiments, valve sealing surface 208, valve seat 209 or suitable sealing material can be comprised both them, such as rubber or some other can the material of Partial shrinkage, this such as can increase the sealability between valve sealing surface 208 and valve seat 209.
According to embodiments of the invention, piston 202 also comprises pressure actuated antelabium 210.In the embodiment illustrated in figure 2, when piston 202 is closed, the process fluid flow from process fluid supply port 112 is acted on pressure actuated antelabium 210 by fluid passage 211,212.As shown, the motion that pressure actuated antelabium 210 is substantially perpendicular to piston 202 extends, and it is along longitudinal axis L.In other embodiments, pressure actuated antelabium 210 can be formed angled relative to longitudinal axis L.Even if due to antelabium 210 pressure actuated when piston 202 is closed still with pressing technology fluid communication, so process fluid acts on pressure actuated antelabium 210 provide the bias force along second direction to piston 202 thus, it is substantially contrary with the first direction on pilot pressure offset piston 202 edges.
As can be appreciated, because piston 202 be in open and close position time pressure actuated antelabium 210 be all exposed to process fluid supply 112, as long as so when process fluid is supplied to port one 12 process fluid just on pressure actuated antelabium 210, provide bias force.According to embodiments of the invention, piston 202 also comprises one or more high pressure sealing member 213, and it stops high-pressure process fluid escapes to being formed in the vent port 214 be communicated with in piston 202 and with vent port 108 fluid be formed in housing 201 substantially.Sealing component 213 can comprise O shape ring, K shape ring etc.The specific sealing component used should not limit the scope of the invention.
According to embodiments of the invention, the size of pressure actuated antelabium 210 is configured such that to have about 25mm(0.95 inch at piston area 205) diameter D 1when, when process fluid is in the pressure of about 40 bar (580 psi), this is typical in SBM application, is less than 10 bar (145 psi) and is more particularly that the pilot pressure of about 8 bar (116 psi) can cut-off valve 200.As can be appreciated, piston area 205 in the present example embodiment comprises the diameter d of the piston 105 being prior art valve 102 2the diameter of half.Suppose circular cross section, this causes the region occupied by piston area 205 to be reduced to 1/4th.According to embodiments of the invention, this minimizing of the cross sectional area of piston area 205 is feasible, and wherein the external diameter of the part 250 extending into piston 202 of valve seal base portion 203 comprises about 24mm(0.94 inch) diameter D 2, and pressure actuated antelabium 210 comprises about 25.5mm(1 inch) outer diameter D 3.As can be appreciated, at diameter D 3and D 2between space result in the pressure acted on pressure actuated antelabium 210 and sealing component 213.These sizes result in about 58.32mm 2(0.09in 2) useful area, to act on for the process fluid pressure of 40 bar when piston 202 is sealed on valve seat 209.Which results in 233.26 N (52.44 lb along second direction f) power.Therefore, due to the bias force provided by the process fluid acted on pressure actuated antelabium 210, valve 200 can when operating to open this valve without the need to carrying out when spring or other biasing member.Those skilled in the art will easily recognize, above-mentioned size and pressure are only example and certainly should not limit the scope of this invention.
If recognize, piston 202 can be maintained in its closed position until the power along first direction on piston 202 drops to lower than threshold force, is namely 233.26 N in this example.
Fig. 3 shows the sectional view of a part for valve 200 according to another embodiment of the present invention.In the embodiment show in figure 3, the pilot pressure in control chamber 204 has dropped to and has been maintained in its closed position required threshold level lower than by piston 202.Therefore, due to the bias force provided by the process fluid acted on pressure actuated antelabium 210 and sealing component 213, piston 202 moves on to open position along second direction.At open position, piston 202 departs from from valve seat 209.Piston 202 can be opened completely and lean against the part in formation control chamber 204 of housing 201 from the projection 330 that piston area 205 extends.In the embodiment comprising this projection, projection 330 can stop whole piston area 205 to contact housing 201, and the area of the piston area 205 being exposed to pilot pressure can be reduced to the area of pilot pressure port 107 by this when piston 202 is in an open position.This structure will require that higher pilot pressure carrys out initially the mobile piston 202 and remaining part of piston area 205 is exposed to pilot pressure.In other embodiments, piston area 205 can be smooth and projection 330 can extend from housing 201.
According to embodiments of the invention, when piston 202 is in an open position, Process fluid outlet 207 and pressure compensation chamber 206 and process fluid are supplied port 112 fluid and are communicated with.Because process fluid is supplied to pressure compensation chamber 206, process fluid acts on the first and second pressure compensation surfaces 315,316 of piston 202.As shown, the second pressure compensation surface 316 comprises first portion, and first portion comprises pressure actuated antelabium 210.As explained above, first portion supplies 112 fluids with process fluid at piston 202 during in the closed position and open position and is communicated with.
According to embodiments of the invention, the first portion on the second pressure compensation surface 316 also can comprise the part being exposed to process fluid of sealing component 213,313.As shown in the drawing, when piston 202 is in an open position, process fluid also will act in sealing component 213,313 with along second direction offset piston 202.In certain embodiments, the pressure acted on sealing component 213,313 can be out in the cold, this is because area is quite little compared with all the other areas on the second pressure compensation surface 316.But, due to the process fluid pressure of 40 bar, may desirably the power set up by the pressure acted on sealing component 213,313 be taken into account.
Second pressure compensation surface 316 be also included in piston 202 in an open position time supply with process fluid the second portion that 112 fluids are communicated with.According to embodiments of the invention, second portion is substantially sealed with process fluid supply 112 when piston 202 is in the closed position and is opened.According to embodiments of the invention, the second portion on the second pressure compensation surface 316 comprises piston sealing surface 208 and ramped surfaces 317.Should be realized, in certain embodiments, ramped surfaces 317 can be omitted and more particularly, sealing surfaces 208 may extend into the end of piston 202.But, ramped surfaces 317 can be configured to contribute to guiding fluid by pressure compensation chamber 206 and flowing out from valve 200 when piston 202 is in an open position.According to one exemplary embodiment of the present invention, the longitudinal axis L of ramped surfaces 317 and piston 202 is into about 30 degree of angles.This angle is only example, and certainly should not limit the scope of this invention.
As can be appreciated, the pressure acted on the first pressure compensation surface 315 provides the bias force along first direction on piston 202, and this is (closedown) upwards as shown in drawings.On the contrary, the process fluid acted on the second pressure compensation surface 316 provides the bias force along second direction on piston 202, and this is downward (opening) as shown in drawings.Because the pressure acted on two pressure compensation surfaces 315,316 acts on substantially contrary direction, so act on the part payment of the bias force on piston 202, namely balance, this generates pressure compensated valve at least in part.Therefore, because piston 202 departs from from valve seat 209, the resulting net force acted on piston 202 quite little process fluid pressure provides compared with the power acted in pressure compensation surface 315,316 on any one.The resulting net force acted on piston 202 can be determined based on the difference between the first pressure compensation surface 315 and the surface area on the second pressure compensation surface 316.
According to embodiment illustrated in the accompanying drawings, the external diameter on the first pressure compensation surface 315 and the second pressure compensation surface 316 is substantially equal.But, the area on pressure compensation surface 315,316 is different, and this is the first diameter D of the piston area 205 of internal diameter owing to being substantially equal to the first pressure compensation surface 315 1with the Second bobbin diameter D being positioned at the part 250 of the valve seal base portion 203 of piston 202 of internal diameter defining the second pressure compensation surface 316 2between difference.Use the size identical with examples shown above, in one example, the first diameter D 1about 25mm(0.98 inch), and Second bobbin diameter D 2about 24mm(0.94 inch).Poor based on this, the effectively clean surface area (area on the second pressure compensation surface 316 deducts the area on the first pressure compensation surface 315) on the second pressure compensation surface is 38.48 mm 2(0.06 in 2).The area that this effectively clean surface area is equivalent to be provided by the external diameter of piston area 205 (25mm) substantially deducts the area provided by the external diameter (24mm) of the part 250 extending to piston 202 of valve seal base portion 203.This is because the counteracted by pressure acted on the area exceeding the diameter of piston area 205 on the first pressure compensation surface 315 and the second pressure compensation surface 316 has been fallen.
The part 250 extending into piston 202 of effectively clean surface area hypothesis piston 202 and valve seal base portion 203 comprises circular cross section.It should be understood that valve 200 can comprise other shape of cross section.Based on the process fluid of 40 bar, the resulting net force acted on piston 202 provided by process fluid when piston 202 departs from from valve seat 209 is 153.94 N (34.61 lb f).According to embodiments of the invention, owing to act on piston 202 with offset piston 202 thus the resulting net force opened is 153.94N, valve 200 can easily cut out by the pilot pressure of 8 bar when needed.As mentioned above, the size provided and pressure are only example and certainly should not limit the scope of this invention.Or rather, the particular value provided is auxiliary understanding and understands the present invention.
Fig. 4 shows the sectional view of a part for blowing valve block 400 according to an embodiment of the invention.Blowing valve block 400 is similar to the prior art blowing valve block shown in Fig. 1.Therefore, similar parts share the reference character identical with Fig. 1.Difference between prior art blowing valve block 100 and blowing valve block 400 of the present invention is the valve 102 that valve 200 instead of prior art.As shown, valve 200 process fluid receiving in self-forming and housing 201 supplies the process fluid supply of port 112, and this housing comprises the housing of valve block 400 in Fig. 4.In addition, Process fluid outlet 207 is shown as and is communicated with opening 113 fluid be formed in stretching bar 103.Therefore, those skilled in the art easily can expect that valve 200 can reduce the energy requirement of operating valve block 400 widely compared with prior art valve block 100.In addition, although it is appreciated that a valve 200 is only shown in the diagram, in fact, valve block 400 can comprise more than one valve 200.Such as, valve block 400 can comprise three or four valves, as explained above.
In use, valve 200 can be used to control the supply of pressing technology fluid.Some other systems that process fluid supply can be used for SBM system or requires pressure fluid to supply.According to embodiments of the invention, valve 200 is actuated to closed position to control chamber 204 so that control chamber 204 is pressurized to threshold pressure by supply pilot pressure.Because valve 200 is actuated to closed position, valve sealing surface 208 and valve seat 209 generally define fluid tight seal.Therefore, process fluid acts in the first portion on pressure compensation surface 316, and it comprises pressure actuated antelabium 210 and sealing component 213, instead of the second whole pressure compensation surface 316, thus on piston 202, provide the bias force along second direction.Therefore, based on the pilot pressure of 8 bar (116psi) and the process fluid pressure of 40 bar (580psi), piston 202 to be had an appointment 392.70 N (88.28 lb by band f) pilot pressure of power is biased and to be had an appointment 233.26 N (52.44 lb by band along first direction f) power process fluid pressure along second direction be biased.Therefore, piston sealing surface 208 is by 159.44 N (35.84 lb f) resulting net force keep be sealed on valve seat 209.
Once, pilot pressure is removed or drops to lower than threshold level, this process fluid pressure based on above-mentioned size and 40 bar is about 4.75 bar (68.90psi), and the process fluid acted in the first portion on the second pressure compensation surface 316 provides enough power with along second direction mobile piston (shown in the drawings is downward) to open position.As discussed above, at open position, the projection 330 extended from piston area 205 leans against housing 201.Advantageously, pressure actuated antelabium 210 substantially eliminates Returnning spring or analog mobile piston sealing surfaces 208 needs away from valve seat 209.
According to embodiments of the invention, because piston 202 is moved to open position, process fluid can act on to provide the bias force along first direction on piston 202 on the first pressure compensation surface 315, towards closed position.Process fluid also can provide the bias force along second direction on the second pressure compensation surface 316, and it is substantially contrary with first direction.Because the bias force acted on piston 202 is partially compensated, acting on piston 202 piston 202 to be biased to the resulting net force of open position is about 153.94 N (34.61 lb f), this is the larger surface area due to the second pressure compensation surface 316, as discussed above.In order to cut-off valve 200 again, control chamber 204 can be pressurized to higher than threshold pressure to overcome the clean bias force of piston 202.
The present invention as described above can reduced in size and/or pilot pressure required by operating valve 200 widely.The operation pressure acted on piston 202 is advantageously compensated by the first and second pressure compensation surface portion, and a part for the power produced by process fluid has been offseted on described pressure compensation surface.Advantageously, be also largely reduced even if act on when resulting net force on piston 202 operates under with hyperbaric environment such as 40 bar.Present invention also offers pressure actuated antelabium 210, it is all communicated with process fluid fluid when piston 202 is in opening and closing, to eliminate the needs to Returnning spring or analog.
Not the detailed description to whole embodiments that the present inventor fallen in the scope of the invention expects to the specific descriptions of embodiment above.In fact, those skilled in the art will recognize that, some element of above-described embodiment can be combined by different way or omit to set up other embodiment, and these other embodiment also falls into scope of the present invention and instruction.Those skilled in the art also understand, above-described embodiment can by integrally or partially combined with set up the scope of the invention and instruction in extra embodiment.
Therefore, although herein in order to purpose of illustration describes the specific embodiment of the present invention and example, within the scope of the invention, various equivalent improvement is also possible, and this is that those skilled in the art can recognize.Instruction provided herein can be applied to other valve, and is not only be applied to above-mentioned and embodiment illustrated in the accompanying drawings.Therefore, scope of the present invention should be determined according to claim below.

Claims (16)

1. a valve (200), it comprises:
Housing (201);
Be formed in this housing (201) with the process fluid of receiving process fluid supply port (112);
Can the piston (202) of movement between open and closed positions in this housing (201), and this piston comprises:
First pressure compensation surface (315), it is supplied port (112) fluid when piston (202) is in an open position with process fluid and is communicated with; And
Second pressure compensation surface (316), its first portion (210) supplies port (112) fluid with process fluid be communicated with when piston (202) is in and opens and closes position, and its second portion (208,317) is supplied port (112) fluid when piston (202) is in an open position with process fluid and is communicated with.
2. valve (200) as claimed in claim 1, wherein the first portion on the second pressure compensation surface (316) comprises pressure actuated antelabium (210).
3. valve (200) as claimed in claim 1, wherein the second portion on the second pressure compensation surface (316) comprises valve sealing surface (208) and ramped surfaces (317).
4. valve (200) as claimed in claim 1, also comprises valve seal base portion (203), its be connected to housing (201) and comprise by piston (202) around part (250).
5. valve (200) as claimed in claim 4, wherein valve seal base portion (203) comprises valve seat (209), and valve seat is configured to substantially form fluid tight seal when piston (202) is in the closed position with the piston sealing surface (208) be formed on piston (202).
6. valve (200) as claimed in claim 1, also comprise control chamber (204), it is limited by housing (201) and piston (202).
7. valve (200) as claimed in claim 6, also comprises pilot pressure port (107), and pilot pressure port to be formed in housing (201) and to be communicated with control chamber (204) fluid.
8. valve (200) as claimed in claim 1, also comprise pressure compensation chamber (206), it is communicated with Process fluid outlet (207) fluid when piston (202) is in an open position and is communicated with process fluid port (112) fluid.
9. valve (200) as claimed in claim 8, process fluid pressure wherein in pressure compensation chamber (206) provides the bias force along first direction and the bias force provided on the second pressure compensation surface (316) along second direction on the first pressure compensation surface (315), and second direction is substantially contrary with first direction.
10. valve (200) as claimed in claim 1, its middle shell (201) comprises a part for the housing for blowing valve block assembly (400).
The method of 11. 1 kinds of operating valves, this valve comprises piston, and this piston has the first and second pressure compensation surfaces and can move between open and closed positions in the housing, and described method comprises step:
Pressing technology fluid is fed to the first portion on the second pressure compensation surface to be activated from closed position towards open position by piston;
Supplied with pressurized process fluid is surperficial to provide towards the bias force of closed position on piston to the first pressure compensation; And
Supplied with pressurised fluid to the first portion on the second pressure compensation surface of piston and second portion to provide towards the bias force of open position on piston, bias force wherein on the second pressure compensation surface is greater than the bias force on the first pressure compensation surface, so that piston is remained on open position.
12. methods as claimed in claim 11, wherein the first portion on the second pressure compensation surface comprises pressure actuated antelabium.
13. methods as claimed in claim 11, wherein the second portion on the second pressure compensation surface comprises valve sealing surface and ramped surfaces.
14. methods as claimed in claim 11, also comprise step: control chamber is pressurized to threshold pressure with by plunger actuation to closed position.
15. methods as claimed in claim 11, also comprise step: supply process fluid when piston is in an open position to performing member.
16. methods as claimed in claim 11, also comprise step: between the valve sealing surface of piston and valve seat, substantially form fluid tight seal when piston is in the closed position.
CN201180044057.6A 2010-09-13 2011-09-10 Pressure compensated valve Expired - Fee Related CN103201548B (en)

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US38230810P 2010-09-13 2010-09-13
US61/382308 2010-09-13
US61/382,308 2010-09-13
PCT/EP2011/065699 WO2012034953A1 (en) 2010-09-13 2011-09-10 Pressure compensated valve

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Publication number Priority date Publication date Assignee Title
EP2870394A4 (en) * 2012-07-09 2016-05-04 Norgren Inc Electromagnet assisted pressure-actuated valve
DE102014015416A1 (en) * 2014-10-20 2016-04-21 Krones Ag Hollow body manufacturing machine
EP4082751B1 (en) * 2021-04-29 2024-03-13 Eugen Seitz AG Method for operating a valve unit and valve unit
EP4082750B1 (en) * 2021-04-29 2023-11-01 Eugen Seitz AG Fixture of a blowing device

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CN2520443Y (en) * 2002-01-09 2002-11-13 湖南省中潭科技企业有限公司 Guide control, pressure compensation safety protection self-operating pressure reducing valve for feedback system
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US3860073A (en) * 1974-01-25 1975-01-14 Norris Industries Fire extinguisher discharge valve
EP0188048A1 (en) * 1984-09-21 1986-07-23 Moog Inc. Pilot-operated valve
CN2520443Y (en) * 2002-01-09 2002-11-13 湖南省中潭科技企业有限公司 Guide control, pressure compensation safety protection self-operating pressure reducing valve for feedback system
CN1886179A (en) * 2003-12-30 2006-12-27 克劳迪奥·贝内蒂 An apparatus for launching balls for sports practice

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