US20080210312A1 - Flow control device - Google Patents
Flow control device Download PDFInfo
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- US20080210312A1 US20080210312A1 US12/117,757 US11775708A US2008210312A1 US 20080210312 A1 US20080210312 A1 US 20080210312A1 US 11775708 A US11775708 A US 11775708A US 2008210312 A1 US2008210312 A1 US 2008210312A1
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- United States
- Prior art keywords
- diaphragm
- valve
- valve seat
- base material
- softer
- 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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- 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
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
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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
- 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
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
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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
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
- F16K7/14—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat
- F16K7/16—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being mechanically actuated, e.g. by screw-spindle or cam
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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
- Y10T137/6851—With casing, support, protector or static constructional installations
- Y10T137/7036—Jacketed
Definitions
- Diaphragm valves are a type of flow control device.
- Existing diaphragm valves include a valve body and a dome shaped diaphragm.
- a seal is provided between the diaphragm and the valve body at or near the outer peripheral area of the diaphragm.
- a bonnet may be used to clamp the diaphragm to the valve body to provide the seal between the valve body and the diaphragm.
- high compressive forces may be needed, especially where imperfections in the valve body and diaphragm surfaces exist and where the diaphragm is made of harder materials.
- the valve body typically includes a passageway between the inlet and the outlet of the valve.
- An actuator is typically employed to flex the diaphragm into engagement with a valve seat to seal off the passageway when desired. Forming a satisfactory seal between the diaphragm and valve seat is important to the performance of the valve.
- the present application relates to a flow control device having a control member that forms a seal with another part of the flow control device, such as for example, a body portion or a seat area.
- the control member may include a portion or surface that is a softer or more deformable than the rest of the control member or than a portion of the control device that the control member forms a seal with.
- the differences in hardness and/or the ability of the control member portion to deform aids in forming the seal. As a result, the amount of force needed to form a satisfactory seal may be less that what is needed if the softer, more deformable portion of the control member is not present.
- the flow control device is a diaphragm-style valve that includes an inlet port, an outlet port, and a valve seat.
- the flow control device includes a control member in the form of a coated, flexible member or diaphragm configured for sealing engagement with the valve seat.
- the coating may be disposed on the flexible member for sealing an interface between the flexible member and the valve seat and/or between the flexible member and a valve body.
- FIG. 1 is an illustration of a diaphragm valve assembled with a pneumatic actuator
- FIG. 2A is an enlarged view showing the portion of FIG. 1 that is identified by the reference FIG. 2 ;
- FIG. 2B is a view similar to the view of FIG. 2A showing the valve body that includes an integral valve seat;
- FIG. 3 is a cross-sectional view of a valve seat.
- FIG. 4A is a schematic illustration of a diaphragm showing contact areas on an actuator side of the diaphragm
- FIG. 4B is a schematic illustration of a diaphragm showing contact areas on a valve seat side of the diaphragm
- FIG. 5A is an enlarged view of the portion of FIG. 2 identified by the reference FIG. 5A illustrating a diaphragm with a coating disposed on both sides of the diaphragm;
- FIG. 5B is a schematic illustration of a diaphragm with a coating disposed on a valve seat side of the diaphragm;
- FIG. 6A is a schematic illustration that shows a coating on a diaphragm filling an imperfection in a valve member
- FIG. 6B is a schematic illustration that shows a coating on a diaphragm conforming to an imperfection in a valve member
- FIG. 7 is a schematic illustration of a coating pattern on the valve seat side of a diaphragm.
- FIG. 8 is a schematic illustration of a coating pattern on the actuator side of a diaphragm.
- the present invention contemplates a flow control device that includes a control member for forming a seal with another part or portion of the flow control device.
- the control member may be, or may include a portion or surface, that is softer or more deform able than the base material of the control member or the portion of the flow control device to which the control member seals.
- the softer material of the control member more readily conforms to surface of the flow control device, thus requiring less force to form a satisfactory seal.
- the flow control device may be, for example, a regulator or a diaphragm valve.
- the control member may be, for example, a flexible member, such as a diaphragm, or some other surface adapted to form a sealing interface with a portion of the flow control device.
- the control member may form a sealing interface with a seat surface or a body portion of the flow control device.
- a softer portion or surface of the control member may be achieved in a variety of ways. For example, a coating may be applied to the base material of the control member or an softer insert may be attached or affixed to the base material.
- a portion of the base material of the control member may be configured to be softer through surface modification, such as for example, making the surface more porous, locally annealing the surface, or some other reaction or modification to achieve a softer or more deformable/elastic surface condition.
- a coated flexible member 10 is used in a valve arrangement 12 that includes a pneumatic actuator 13 , an inlet port 14 , an outlet port 16 , and a valve seat 18 .
- the coated flexible member 10 in the exemplary embodiment of FIG. 1 is realized in the form of a diaphragm for providing a sealing engagement with the valve seat 18 .
- the illustrated inlet port 14 could function as an outlet port and the illustrated outlet port 16 could function as an inlet port.
- diaphragm 10 could be used in a variety of different types of valve arrangements, such as for example, but not limited to, manually actuated valve arrangements, electrically actuated valve arrangements, and normally open or normally closed valve arrangements.
- the diaphragm 10 comprises a flexible metallic member 20 or substrate.
- a coating 22 is disposed on the flexible metallic member (see FIGS. 4A and 4B ) to aid in sealing an interface between the diaphragm 10 and the valve seat 18 and/or an interface between the diaphragm and a valve body 26 .
- the valve seat 18 is a separate annular seat member that is assembled with the valve body 26 .
- the separate annular seat member 18 may be a plastic member, a metallic member, an annular metallic member that includes a thin polymer coating, or other suitable material(s).
- the thin polymer coating may be formed from the same materials as the coating 22 on the diaphragm 10 .
- the valve seat 18 includes the coating 22 and the diaphragm 10 does not includes the coating in the area of contact with the valve seat.
- valve seat 18 is integrally formed with the valve body 26 .
- the valve body 26 may be a metallic member and the valve seat 18 may be a metallic portion of the valve body.
- the valve seat 18 may be configured in a variety of ways.
- FIG. 3 illustrates one possible valve seat configuration.
- the integral valve seat 18 has a rounded annular bead cross-section 27 .
- the diaphragm 10 is assembled with the valve body 26 to flex into sealing engagement with the valve seat 18 and out of engagement with the valve seat.
- the diaphragm 10 has an actuator side 28 and a valve seat side 29 .
- the valve body 26 and the diaphragm 10 define a flow path from the inlet port 14 to the outlet port 16 when the diaphragm is not flexed, thus allowing process fluid to flow from the inlet port 14 to the outlet port 16 .
- the pneumatic actuator 13 is assembled with the valve body 26 and diaphragm 10 for selectively flexing the diaphragm into and out of engagement with the valve seat 18 .
- the coating 22 contacts and seals with the valve seat.
- a bonnet 34 secures the diaphragm 10 to the valve body 26 and a bonnet nut 36 clamps the bonnet 34 and diaphragm 10 to the valve body 26 .
- a bonnet nut 36 clamps the bonnet 34 and diaphragm 10 to the valve body 26 .
- the illustrated bonnet nut 36 includes internal threads 38 that engage outer threads 39 of the valve body 26 .
- a clamping surface 40 of the bonnet nut 36 engages an end surface 42 of the bonnet 34 to force the bonnet toward the valve body 26 .
- an annular ridge 44 on the bonnet 34 and an annular ridge 46 on the valve body 26 clamp the outer periphery of the diaphragm 10 to form a seal between the outer periphery of the diaphragm 10 and the valve body 26 .
- the coating 22 on the periphery of the diaphragm 10 acts as a seal between the diaphragm flexible metallic member 20 or substrate and the valve body 26 .
- the actuator 13 is assembled to the valve assembly 12 by the bonnet nut 36 .
- the illustrated bonnet nut 36 includes internal threads 56 that engage external threads 58 of the actuator 13 .
- the actuator 13 selectively extends an actuator rod 60 to move a button 62 along a path of travel defined by the bonnet 34 .
- the button 62 deflects the diaphragm 10 into sealing engagement with the valve seat 18 .
- the diaphragm 10 flexes away from the valve seat 18 to open the flowpath between the inlet port 14 and outlet port 16 .
- FIG. 4A schematically illustrates where the bonnet annular ridge 44 engages the diaphragm 10 when the valve arrangement 12 is assembled.
- Phantom line 50 illustrates the contact location of the bonnet annular ridge 44 on the actuator side 28 of the diaphragm 10 .
- the bonnet annular ridge 44 may contact the diaphragm 10 along the phantom line 50 or may contact an area of the diaphragm 10 , such as for example, the area on the diaphragm 10 between the phantom line 50 and the outer edge of the diaphragm.
- FIG. 4B schematically illustrates where the valve body annular ridge 46 and where the valve seat 18 engage the valve seat side 29 of the diaphragm 10 when the valve arrangement 12 is assembled.
- Phantom lines 52 , 54 illustrate the contact location of the valve body annular ridge 46 on the diaphragm 10 and phantom lines 64 , 66 illustrate the contact location of the valve seat 18 engages diaphragm 10 .
- Both the valve body annular ridge 46 and the valve seat 18 may contact the diaphragm 10 along the respective phantom lines or may contact an area of the diaphragm 10 .
- the coating 22 on the diaphragm 10 may be applied to one or both sides of the diaphragm 10 .
- the coating 22 is disposed on both sides of the base material 20 .
- the coating 22 is disposed only on the valve seat side 29 of the diaphragm 10 .
- the coating 22 on the diaphragm 10 may be a wide variety of different materials which may aid in sealing the interface between the diaphragm 10 and the valve seat 18 and/or valve body 26 , may sufficiently adhere or bond to the base material, and may be sufficiently temperature and chemically compatible to the valve arrangement's application.
- the coating 22 on the diaphragm 10 comprises a fluoropolymer material, such as polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), or perfluoroelastomer, such as for example, KALREZ®.
- PTFE polytetrafluoroethylene
- PFA perfluoroalkoxy
- KALREZ® perfluoroelastomer
- the coating parameters are selected to enable the diaphragm valve arrangement 12 to operate in a wide range of environments.
- a thin coating allows the valve arrangement 12 to operate in an environment with a temperature up to and possibly exceeding approximately 300 degrees C. In one embodiment, the coating is less than 0.001′′ thick.
- the coating 22 may be applied to the diaphragm 10 , such that the coating will permanently adhere to the diaphragm surface.
- Existing fluoropolymer coating techniques such as the techniques used to apply fluoropolymers to non-stick pans, may be used to apply the coating 22 to the metal diaphragm 10 .
- the coating 22 facilitates a high integrity seal between the diaphragm 10 and the valve body 26 and/or the diaphragm and the valve seat 18 (which may be integrally formed with the valve body), even when the surfaces of the diaphragm, the valve body and/or the valve seat include imperfections.
- imperfections include voids 70 ( FIG. 6A ), such as for example, scratches, and bumps 71 ( FIG. 6B ).
- the valve seat 18 , valve body 26 , bonnet 34 , or the diaphragm member 18 itself may include an imperfection, such as a void 70 or a bump 71 .
- a metallic valve body 26 that includes an integrally formed valve seat 18 may be used with a low actuation force actuator.
- no secondary operations are required to connect a seat 18 to the valve body 26 .
- the coating 22 may be applied to the entire actuator side 28 and/or the entire valve seat side 29 of the diaphragm 10 or the coating may be applied in a pattern to one or both sides of the diaphragm.
- a pattern of coating 22 is applied to the diaphragm 10 generally only in areas where a seal is formed by the diaphragm 10 with the valve body 26 , the valve seat 18 , and the bonnet 34 (as illustrated in FIGS. 4A and 4B ).
- the coating 22 may be applied in any pattern desired, such as for example, to generally match the sealing areas of valve arrangements with various configurations.
- the coating 22 may also be applied in a buffer region surrounding the areas where a seal is formed. By limiting the area where the coating 22 is applied to the diaphragm 10 , wetting of the coating by fluid that flows through the valve arrangement 12 is reduced.
- an outer ring 80 of coating 22 is applied to the valve seat side 29 of the diaphragm 10 .
- the illustrated outer ring 80 of coating covers the area (illustrated by phantom lines 52 , 54 in FIG. 4B ) of the diaphragm 10 where the valve body annular ridge 46 engages the diaphragm.
- the outer ring 80 is wider than the area where the valve body 26 engages the diaphragm 10 to ensure proper sealing even if alignment of the diaphragm and the valve body is not precise.
- the outer ring 80 is sized to be the same width, or slightly narrower than the area where the valve body annular ridge 46 engages the diaphragm 10 . In this embodiment, wetting of the outer ring 80 of the coating 22 by process fluid is substantially eliminated.
- an inner ring 82 of coating 22 is applied to the valve seat side 29 of the diaphragm 10 .
- the illustrated inner ring 82 of coating covers the area (illustrated by phantom lines 64 , 66 in FIG. 4B ) of the diaphragm 10 where the valve seat 18 engages the diaphragm.
- the inner ring 82 is wider than the area where the valve seat 18 engages the diaphragm 10 to ensure proper sealing even if alignment of the diaphragm and the valve seat is not precise.
- the inner ring 82 is sized to be the same width, or slightly narrower than the area where the valve seat 18 engages the diaphragm 10 . In this embodiment, wetting of the inner ring 82 of the coating 22 by process fluid when the diaphragm valve is closed is substantially eliminated.
- a ring 88 of coating is applied to the actuator side 28 of the diaphragm 10 .
- the illustrated ring 88 of coating 22 covers the area (illustrated by phantom line 50 in FIG. 6 ) of the diaphragm to where the bonnet 34 engages the diaphragm.
- the ring 88 is wider than the area where the bonnet 34 engages the diaphragm 10 to ensure proper sealing even if alignment of the diaphragm and the bonnet is not precise.
- the ring 88 of coating 22 is sized to be the same width, or slightly narrower than the area where the bonnet 34 engages the diaphragm.
- the coating 22 on the diaphragm 10 By patterning the coating 22 on the diaphragm 10 only in areas where a seal is formed between the diaphragm 10 and another member, the potential for particle generation and the overall surface area of polymer coating exposed to process fluid is reduced. Reducing the exposed coating surface area reduces the amount of process fluid that could potentially be absorbed by the coating 22 and thereby reduces the possibility that purge performance will be compromised by using a coated diaphragm 10 .
- the valve body 26 comprises a metallic member
- the valve seat 18 is an integrally formed metallic portion of the valve body 26
- the diaphragm 10 comprises a metallic member
- the coating 22 comprises a polymer, such as fluoropolymer material.
- the coating 22 acts as a seal between the metallic valve seat 18 and/or the metallic valve body 26 . If the seal provided by the diaphragm coating 22 is damaged, for example, by contamination or an environmental problem, the diaphragm 10 can be easily removed and replaced with a new coated diaphragm that provides a fresh seal.
- the inclusion of an integrally formed metallic seat 18 allows for an increased flow of process fluid as compared with valve bodies that include staked-in plastic valve seats. The flow is higher with an integral seat, because the combination of the structure needed to stake-in the valve seat and the valve seat itself is larger than an integral valve seat and the valve porting can thus be made larger for a given valve body size.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Fluid-Driven Valves (AREA)
- Gasket Seals (AREA)
Abstract
A flow control device having a control member for forming a seal with another part of the flow control device. The control member having a base material and a portion or surface that is a softer or more deformable than the base material or the portion of the control device that the control member forms a seal with. The differences in hardness and/or the ability of the control member portion to deform, aids in forming the seal.
Description
- This application claims the benefit of U.S. provisional patent application Ser. No. 60/648,543 for COATED VALVE DIAPHRAGM filed Jan. 31, 2005, the entire disclosure of which is fully incorporated herein by reference.
- Diaphragm valves are a type of flow control device. Existing diaphragm valves include a valve body and a dome shaped diaphragm. A seal is provided between the diaphragm and the valve body at or near the outer peripheral area of the diaphragm. A bonnet may be used to clamp the diaphragm to the valve body to provide the seal between the valve body and the diaphragm. In order to achieve a satisfactory seal, high compressive forces may be needed, especially where imperfections in the valve body and diaphragm surfaces exist and where the diaphragm is made of harder materials.
- The valve body typically includes a passageway between the inlet and the outlet of the valve. An actuator is typically employed to flex the diaphragm into engagement with a valve seat to seal off the passageway when desired. Forming a satisfactory seal between the diaphragm and valve seat is important to the performance of the valve.
- The present application relates to a flow control device having a control member that forms a seal with another part of the flow control device, such as for example, a body portion or a seat area. The control member may include a portion or surface that is a softer or more deformable than the rest of the control member or than a portion of the control device that the control member forms a seal with. The differences in hardness and/or the ability of the control member portion to deform, aids in forming the seal. As a result, the amount of force needed to form a satisfactory seal may be less that what is needed if the softer, more deformable portion of the control member is not present.
- In one embodiment, the flow control device is a diaphragm-style valve that includes an inlet port, an outlet port, and a valve seat. The flow control device includes a control member in the form of a coated, flexible member or diaphragm configured for sealing engagement with the valve seat. The coating may be disposed on the flexible member for sealing an interface between the flexible member and the valve seat and/or between the flexible member and a valve body.
- In the accompanying drawings, which are incorporated in and constitute a part of this specification, an embodiment of the invention is illustrated, which, together with a general description of the invention given above, and the detailed description given below, serve to illustrate the principles of this invention.
-
FIG. 1 is an illustration of a diaphragm valve assembled with a pneumatic actuator; -
FIG. 2A is an enlarged view showing the portion ofFIG. 1 that is identified by the referenceFIG. 2 ; -
FIG. 2B is a view similar to the view ofFIG. 2A showing the valve body that includes an integral valve seat; -
FIG. 3 is a cross-sectional view of a valve seat. -
FIG. 4A is a schematic illustration of a diaphragm showing contact areas on an actuator side of the diaphragm; -
FIG. 4B is a schematic illustration of a diaphragm showing contact areas on a valve seat side of the diaphragm; -
FIG. 5A is an enlarged view of the portion ofFIG. 2 identified by the referenceFIG. 5A illustrating a diaphragm with a coating disposed on both sides of the diaphragm; -
FIG. 5B is a schematic illustration of a diaphragm with a coating disposed on a valve seat side of the diaphragm; -
FIG. 6A is a schematic illustration that shows a coating on a diaphragm filling an imperfection in a valve member; -
FIG. 6B is a schematic illustration that shows a coating on a diaphragm conforming to an imperfection in a valve member; -
FIG. 7 is a schematic illustration of a coating pattern on the valve seat side of a diaphragm; and -
FIG. 8 is a schematic illustration of a coating pattern on the actuator side of a diaphragm. - While various aspects and concepts of the invention are described and illustrated herein as embodied in combination in the exemplary embodiments, these various aspects and concepts may be realized in many alternative embodiments, either individually or in various combinations and sub-combinations thereof. Unless expressly excluded herein all such combinations and sub-combinations are intended to be within the scope of the present invention. Still further, while various alternative embodiments as to the various aspects and features of the invention, such as alternative materials, structures, configurations, methods, devices, software, hardware, control logic and so on may be described herein, such descriptions are not intended to be a complete or exhaustive list of available alternative embodiments, whether presently known or identified herein as conventional or standard or later developed. Those skilled in the art may readily adopt one or more of the aspects, concepts or features of the invention into additional embodiments within the scope of the present invention even if such embodiments are not expressly disclosed herein. Additionally, even though some features, concepts or aspects of the invention may be described herein as being a preferred arrangement or method, such description is not intended to suggest that such feature is required or necessary unless expressly so stated. Still further, exemplary or representative values and ranges may be included to assist in understanding the present invention however, such values and ranges are not to be construed in a limiting sense and are intended to be critical values or ranges only if so expressly stated.
- The present invention contemplates a flow control device that includes a control member for forming a seal with another part or portion of the flow control device. In order to facilitate a satisfactory seal, the control member may be, or may include a portion or surface, that is softer or more deform able than the base material of the control member or the portion of the flow control device to which the control member seals. The softer material of the control member more readily conforms to surface of the flow control device, thus requiring less force to form a satisfactory seal.
- The flow control device may be, for example, a regulator or a diaphragm valve. The control member may be, for example, a flexible member, such as a diaphragm, or some other surface adapted to form a sealing interface with a portion of the flow control device. For example, the control member may form a sealing interface with a seat surface or a body portion of the flow control device. A softer portion or surface of the control member may be achieved in a variety of ways. For example, a coating may be applied to the base material of the control member or an softer insert may be attached or affixed to the base material. In addition, a portion of the base material of the control member may be configured to be softer through surface modification, such as for example, making the surface more porous, locally annealing the surface, or some other reaction or modification to achieve a softer or more deformable/elastic surface condition.
- Referring to the exemplary embodiment of
FIG. 1 , a coatedflexible member 10 is used in avalve arrangement 12 that includes apneumatic actuator 13, aninlet port 14, anoutlet port 16, and avalve seat 18. The coatedflexible member 10 in the exemplary embodiment ofFIG. 1 is realized in the form of a diaphragm for providing a sealing engagement with thevalve seat 18. It should be readily apparent that the illustratedinlet port 14 could function as an outlet port and the illustratedoutlet port 16 could function as an inlet port. Furthermore, it should be readily apparent, that thediaphragm 10 could be used in a variety of different types of valve arrangements, such as for example, but not limited to, manually actuated valve arrangements, electrically actuated valve arrangements, and normally open or normally closed valve arrangements. - In the exemplary embodiment of
FIG. 1 , thediaphragm 10 comprises a flexiblemetallic member 20 or substrate. Acoating 22 is disposed on the flexible metallic member (seeFIGS. 4A and 4B ) to aid in sealing an interface between thediaphragm 10 and thevalve seat 18 and/or an interface between the diaphragm and avalve body 26. - In the embodiment illustrated by
FIG. 2A , thevalve seat 18 is a separate annular seat member that is assembled with thevalve body 26. The separateannular seat member 18 may be a plastic member, a metallic member, an annular metallic member that includes a thin polymer coating, or other suitable material(s). The thin polymer coating may be formed from the same materials as thecoating 22 on thediaphragm 10. In one embodiment of thediaphragm valve arrangement 12, thevalve seat 18 includes thecoating 22 and thediaphragm 10 does not includes the coating in the area of contact with the valve seat. - In the embodiment illustrated by
FIG. 2B , thevalve seat 18 is integrally formed with thevalve body 26. For example, thevalve body 26 may be a metallic member and thevalve seat 18 may be a metallic portion of the valve body. Thevalve seat 18 may be configured in a variety of ways. For example,FIG. 3 illustrates one possible valve seat configuration. In the example ofFIG. 3 , theintegral valve seat 18 has a roundedannular bead cross-section 27. - Referring to the exemplary embodiment of
FIGS. 1 , 2A, and 2B, thediaphragm 10 is assembled with thevalve body 26 to flex into sealing engagement with thevalve seat 18 and out of engagement with the valve seat. When assembled, thediaphragm 10 has anactuator side 28 and avalve seat side 29. Thevalve body 26 and thediaphragm 10 define a flow path from theinlet port 14 to theoutlet port 16 when the diaphragm is not flexed, thus allowing process fluid to flow from theinlet port 14 to theoutlet port 16. Thepneumatic actuator 13 is assembled with thevalve body 26 anddiaphragm 10 for selectively flexing the diaphragm into and out of engagement with thevalve seat 18. When thediaphragm 10 is flexed into engagement with thevalve seat 18, thecoating 22 contacts and seals with the valve seat. - In the illustrated example, a
bonnet 34 secures thediaphragm 10 to thevalve body 26 and abonnet nut 36 clamps thebonnet 34 anddiaphragm 10 to thevalve body 26. By including thecoating 22 on thediaphragm 10 in the area where thevalve body 26 engages the periphery of thediaphragm 10, the amount of force required to properly seal thediaphragm 10 to thevalve body 26 is reduced. In addition, the range of acceptable forces that will properly seal thediaphragm 10 with thevalve body 26 is broadened. The illustratedbonnet nut 36 includesinternal threads 38 that engageouter threads 39 of thevalve body 26. A clampingsurface 40 of thebonnet nut 36 engages anend surface 42 of thebonnet 34 to force the bonnet toward thevalve body 26. In the illustrated embodiment, anannular ridge 44 on thebonnet 34 and anannular ridge 46 on thevalve body 26 clamp the outer periphery of thediaphragm 10 to form a seal between the outer periphery of thediaphragm 10 and thevalve body 26. Thecoating 22 on the periphery of thediaphragm 10 acts as a seal between the diaphragm flexiblemetallic member 20 or substrate and thevalve body 26. - In the example illustrated by
FIGS. 1 , 2A, and 2B, theactuator 13 is assembled to thevalve assembly 12 by thebonnet nut 36. The illustratedbonnet nut 36 includesinternal threads 56 that engageexternal threads 58 of theactuator 13. Theactuator 13 selectively extends anactuator rod 60 to move abutton 62 along a path of travel defined by thebonnet 34. When therod 60 is extended, thebutton 62 deflects thediaphragm 10 into sealing engagement with thevalve seat 18. When therod 60 is retracted, thediaphragm 10 flexes away from thevalve seat 18 to open the flowpath between theinlet port 14 andoutlet port 16. -
FIG. 4A schematically illustrates where the bonnetannular ridge 44 engages thediaphragm 10 when thevalve arrangement 12 is assembled.Phantom line 50 illustrates the contact location of the bonnetannular ridge 44 on theactuator side 28 of thediaphragm 10. The bonnetannular ridge 44 may contact thediaphragm 10 along thephantom line 50 or may contact an area of thediaphragm 10, such as for example, the area on thediaphragm 10 between thephantom line 50 and the outer edge of the diaphragm. -
FIG. 4B schematically illustrates where the valve bodyannular ridge 46 and where thevalve seat 18 engage thevalve seat side 29 of thediaphragm 10 when thevalve arrangement 12 is assembled.Phantom lines annular ridge 46 on thediaphragm 10 andphantom lines valve seat 18 engagesdiaphragm 10. Both the valve bodyannular ridge 46 and thevalve seat 18 may contact thediaphragm 10 along the respective phantom lines or may contact an area of thediaphragm 10. - The
coating 22 on thediaphragm 10 may be applied to one or both sides of thediaphragm 10. In the example illustrated byFIG. 5A , thecoating 22 is disposed on both sides of thebase material 20. In the example illustrated byFIG. 5B , thecoating 22 is disposed only on thevalve seat side 29 of thediaphragm 10. - The
coating 22 on thediaphragm 10 may be a wide variety of different materials which may aid in sealing the interface between thediaphragm 10 and thevalve seat 18 and/orvalve body 26, may sufficiently adhere or bond to the base material, and may be sufficiently temperature and chemically compatible to the valve arrangement's application. In an exemplary embodiment, thecoating 22 on thediaphragm 10 comprises a fluoropolymer material, such as polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), or perfluoroelastomer, such as for example, KALREZ®. Afluoropolymer material coating 22 facilitates a high-integrity seal with a low required actuator force. - In the exemplary embodiment, the coating parameters are selected to enable the
diaphragm valve arrangement 12 to operate in a wide range of environments. A thin coating allows thevalve arrangement 12 to operate in an environment with a temperature up to and possibly exceeding approximately 300 degrees C. In one embodiment, the coating is less than 0.001″ thick. Thecoating 22 may be applied to thediaphragm 10, such that the coating will permanently adhere to the diaphragm surface. Existing fluoropolymer coating techniques, such as the techniques used to apply fluoropolymers to non-stick pans, may be used to apply thecoating 22 to themetal diaphragm 10. - Referring to
FIGS. 6A and 6B , thecoating 22 facilitates a high integrity seal between thediaphragm 10 and thevalve body 26 and/or the diaphragm and the valve seat 18 (which may be integrally formed with the valve body), even when the surfaces of the diaphragm, the valve body and/or the valve seat include imperfections. Examples of imperfections include voids 70 (FIG. 6A ), such as for example, scratches, and bumps 71 (FIG. 6B ). In the examples illustrated byFIGS. 6A and 6B , thevalve seat 18,valve body 26,bonnet 34, or thediaphragm member 18 itself may include an imperfection, such as a void 70 or abump 71. When a force (indicated by arrow 72) is applied to thediaphragm 10, thesofter coating 22 fills the void 70 or conforms around thebump 71 to thereby inhibit leakage. As a result, ametallic valve body 26 that includes an integrally formedvalve seat 18 may be used with a low actuation force actuator. In addition, with an integrally formed seat, no secondary operations are required to connect aseat 18 to thevalve body 26. - The
coating 22 may be applied to theentire actuator side 28 and/or the entirevalve seat side 29 of thediaphragm 10 or the coating may be applied in a pattern to one or both sides of the diaphragm. In the example ofFIGS. 7 and 8 , a pattern ofcoating 22 is applied to thediaphragm 10 generally only in areas where a seal is formed by thediaphragm 10 with thevalve body 26, thevalve seat 18, and the bonnet 34 (as illustrated inFIGS. 4A and 4B ). It should be readily apparent, that thecoating 22 may be applied in any pattern desired, such as for example, to generally match the sealing areas of valve arrangements with various configurations. - The
coating 22 may also be applied in a buffer region surrounding the areas where a seal is formed. By limiting the area where thecoating 22 is applied to thediaphragm 10, wetting of the coating by fluid that flows through thevalve arrangement 12 is reduced. In the example ofFIG. 7 , anouter ring 80 ofcoating 22 is applied to thevalve seat side 29 of thediaphragm 10. The illustratedouter ring 80 of coating covers the area (illustrated byphantom lines FIG. 4B ) of thediaphragm 10 where the valve bodyannular ridge 46 engages the diaphragm. In the illustrated embodiment, theouter ring 80 is wider than the area where thevalve body 26 engages thediaphragm 10 to ensure proper sealing even if alignment of the diaphragm and the valve body is not precise. In one embodiment, theouter ring 80 is sized to be the same width, or slightly narrower than the area where the valve bodyannular ridge 46 engages thediaphragm 10. In this embodiment, wetting of theouter ring 80 of thecoating 22 by process fluid is substantially eliminated. - In the example of
FIG. 7 , aninner ring 82 ofcoating 22 is applied to thevalve seat side 29 of thediaphragm 10. The illustratedinner ring 82 of coating covers the area (illustrated byphantom lines FIG. 4B ) of thediaphragm 10 where thevalve seat 18 engages the diaphragm. In the illustrated embodiment, theinner ring 82 is wider than the area where thevalve seat 18 engages thediaphragm 10 to ensure proper sealing even if alignment of the diaphragm and the valve seat is not precise. In one embodiment, theinner ring 82 is sized to be the same width, or slightly narrower than the area where thevalve seat 18 engages thediaphragm 10. In this embodiment, wetting of theinner ring 82 of thecoating 22 by process fluid when the diaphragm valve is closed is substantially eliminated. - In the example of
FIG. 8 , aring 88 of coating is applied to theactuator side 28 of thediaphragm 10. The illustratedring 88 ofcoating 22 covers the area (illustrated byphantom line 50 inFIG. 6 ) of the diaphragm to where thebonnet 34 engages the diaphragm. In the illustrated embodiment, thering 88 is wider than the area where thebonnet 34 engages thediaphragm 10 to ensure proper sealing even if alignment of the diaphragm and the bonnet is not precise. In one embodiment, thering 88 ofcoating 22 is sized to be the same width, or slightly narrower than the area where thebonnet 34 engages the diaphragm. - By patterning the
coating 22 on thediaphragm 10 only in areas where a seal is formed between thediaphragm 10 and another member, the potential for particle generation and the overall surface area of polymer coating exposed to process fluid is reduced. Reducing the exposed coating surface area reduces the amount of process fluid that could potentially be absorbed by thecoating 22 and thereby reduces the possibility that purge performance will be compromised by using acoated diaphragm 10. - In one exemplary embodiment, the
valve body 26 comprises a metallic member, thevalve seat 18 is an integrally formed metallic portion of thevalve body 26, thediaphragm 10 comprises a metallic member, and thecoating 22 comprises a polymer, such as fluoropolymer material. In this embodiment, thecoating 22 acts as a seal between themetallic valve seat 18 and/or themetallic valve body 26. If the seal provided by thediaphragm coating 22 is damaged, for example, by contamination or an environmental problem, thediaphragm 10 can be easily removed and replaced with a new coated diaphragm that provides a fresh seal. The inclusion of an integrally formedmetallic seat 18 allows for an increased flow of process fluid as compared with valve bodies that include staked-in plastic valve seats. The flow is higher with an integral seat, because the combination of the structure needed to stake-in the valve seat and the valve seat itself is larger than an integral valve seat and the valve porting can thus be made larger for a given valve body size. - The invention has been described with reference to the preferred embodiments. Modification and alterations will occur to others upon a reading and understanding of this specification. It is intended to include all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (35)
1-33. (canceled)
34. A diaphragm for sealing against a valve seat in a flow control device that includes an inlet port, and an outlet port, the diaphragm comprising:
a flexible metallic member made from a base material; and
a softer surface that is softer than the base material disposed on the base material for sealing with the valve seat; wherein the softer surface is disposed on the base material in a pattern comprising a ring of the softer surface on the base material of the flexible metallic member that is configured to engage the valve seat, a first area of the flexible metallic member without the softer surface that extends radially inward from the ring, and a second area without the softer surface that extends radially outward from the ring.
35. The diaphragm of claim 34 wherein the softer surface comprises a polymer material.
36. The diaphragm of claim 34 wherein the softer surface comprises a fluoropolymer material.
37. The diaphragm of claim 34 wherein the softer surface comprises polytetrafluoroethylene.
38. The diaphragm valve of claim 34 wherein the softer surface is formed by a surface reaction of the base material.
39. The diaphragm of claim 34 wherein the pattern of the softer surface is defined on a first side of the flexible metallic member and a second pattern is applied to a second side of the flexible metallic member.
40. The diaphragm of claim 34 wherein the pattern of the ring generally matches the area where the diaphragm forms a seal with the valve seat when the diaphragm is used in the flow control device.
41. The diaphragm of claim 34 wherein the ring has a width that is less than or equal to a width of an area of the valve seat that engages the flexible metallic member to substantially eliminate wetting of the ring of coating when the diaphragm is used in the flow control device and the diaphragm is seated against the valve seat.
42. A diaphragm valve comprising:
a valve body including an inlet port, an outlet port, and a valve seat; and
a diaphragm made from a base material assembled with the valve body, the diaphragm being configured to flex into sealing engagement with the valve seat to inhibit fluid flow from the inlet port to the outlet port and out of sealing engagement with the valve seat to allow fluid flow from the inlet port to the outlet port;
wherein the diaphragm includes a softer surface that is softer than the base material disposed on the base material for forming a seal with the valve seat when the diaphragm is flexed into engagement with the valve seat;
wherein the softer surface is disposed on the diaphragm in a pattern comprising a ring of the softer surface on the base material that engages the valve seat when the valve is closed, a first area of the diaphragm where a surface of the base material is exposed that extends radially inward from the inner ring, and a second area of the diaphragm where a surface of the base material is exposed that extends radially outward from the inner ring.
43. The diaphragm valve of claim 42 wherein the softer surface comprises a coating of a polymer material.
44. The diaphragm valve of claim 43 wherein the coating comprises a fluoropolymer material.
45. The diaphragm valve of claim 43 wherein the base material is metal and the coating comprises a fluoropolymer material.
46. The diaphragm valve of claim 42 wherein the softer surface is formed by a surface reaction of the base material.
47. The diaphragm valve of claim 42 wherein the ring defined by the pattern generally matches the area where the diaphragm forms a seal with the valve seat.
48. The diaphragm valve of claim 42 wherein the valve seat is a separate component that is assembled with the valve body.
49. The diaphragm valve of claim 42 wherein the valve seat is integrally formed with the valve body.
50. The diaphragm of claim 42 wherein the ring has a width that is less than or equal to a width of an area of the valve seat that engages the diaphragm to substantially eliminate wetting of the softer surface when the diaphragm is seated against the valve seat.
51. A diaphragm valve comprising:
a valve body including an inlet port, an outlet port, and a valve seat; and
a diaphragm made from a base material assembled with the valve body, the diaphragm being configured to flex into sealing engagement with the valve seat to inhibit fluid flow from the inlet port to the outlet port and out of sealing engagement with the valve seat to allow fluid flow from the inlet port to the outlet port;
wherein the diaphragm includes a softer surface that is softer than the base material disposed on the base material for forming a seal with the valve seat when the diaphragm is flexed into engagement with the valve seat;
wherein the softer surface is disposed on the diaphragm in a pattern comprising a ring of the softer surface on the base material that engages the valve seat when the valve is closed, a first area of the diaphragm without the softer surface that extends radially inward from the inner ring, and a second area of the diaphragm without the softer surface that extends radially outward from the inner ring.
52. The diaphragm valve of claim 51 wherein the softer surface comprises a coating of a polymer material.
53. The diaphragm valve of claim 52 wherein the coating comprises a fluoropolymer material.
54. The diaphragm valve of claim 52 wherein the base material is metal and the coating comprises a fluoropolymer material.
55. The diaphragm valve of claim 52 wherein the softer surface is formed by a surface reaction of the base material.
56. The diaphragm valve of claim 51 wherein the ring defined by the pattern generally matches the area where the diaphragm forms a seal with the valve seat.
57. The diaphragm valve of claim 51 wherein the valve seat is a separate component that is assembled with the valve body.
58. The diaphragm valve of claim 51 wherein the valve seat is integrally formed with the valve body.
59. The diaphragm of claim 51 wherein the ring has a width that is less than or equal to a width of an area of the valve seat that engages the diaphragm to substantially eliminate wetting of the softer surface when the diaphragm is seated against the valve seat.
60. A diaphragm valve comprising:
a body portion including a valve seat; and
a diaphragm assembled with the body portion, the diaphragm being configured for moving into sealing engagement with the valve seat;
wherein the diaphragm includes a base material and softer sealing material that is disposed on the base material only in an area where the diaphragm contacts and forms a seal with the valve seat.
61. The diaphragm valve of claim 60 wherein the softer sealing material comprises a polymer material.
62. The diaphragm valve of claim 60 wherein the softer scaling material comprises a fluoropolymer material.
63. The diaphragm valve of claim 60 wherein the base material comprises metal.
64. The diaphragm valve of claim 60 wherein the base material comprises metal and the softer surface material is formed by a surface reaction of the base material.
65. The diaphragm valve of claim 60 wherein the valve seat is a separate component that is assembled with the body portion.
66. The diaphragm of claim 60 wherein the softer sealing material is disposed on the base material in a ring that has a width that is less than or equal to a width of an area of the valve seat that engages the diaphragm to substantially eliminate wetting of the ring when the diaphragm is seated against the valve seat.
67. A diaphragm valve comprising:
a body portion including a valve seat; and
a diaphragm assembled with the body portion, the diaphragm being configured for moving into sealing engagement with the valve seat;
wherein the diaphragm includes a base material and softer sealing material that is disposed on the base material only in an area where the diaphragm contacts and forms a seal with the valve seat and a buffer region extending directly from and surrounding the area where the diaphragm contacts and forms a seal with the valve seat.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/117,757 US20080210312A1 (en) | 2005-01-31 | 2008-05-09 | Flow control device |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US64854305P | 2005-01-31 | 2005-01-31 | |
US11/343,105 US7370664B2 (en) | 2005-01-31 | 2006-01-30 | Flow control device |
US12/117,757 US20080210312A1 (en) | 2005-01-31 | 2008-05-09 | Flow control device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/343,105 Continuation US7370664B2 (en) | 2005-01-31 | 2006-01-30 | Flow control device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080210312A1 true US20080210312A1 (en) | 2008-09-04 |
Family
ID=36354114
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/343,105 Expired - Fee Related US7370664B2 (en) | 2005-01-31 | 2006-01-30 | Flow control device |
US12/117,757 Abandoned US20080210312A1 (en) | 2005-01-31 | 2008-05-09 | Flow control device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/343,105 Expired - Fee Related US7370664B2 (en) | 2005-01-31 | 2006-01-30 | Flow control device |
Country Status (3)
Country | Link |
---|---|
US (2) | US7370664B2 (en) |
TW (1) | TW200632243A (en) |
WO (1) | WO2006083783A1 (en) |
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US20190178394A1 (en) * | 2017-12-08 | 2019-06-13 | Kitz Sct Corporation | Fluid control valve and fluid control valve assembling method |
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TWI560386B (en) * | 2015-04-16 | 2016-12-01 | Bueno Technology Co Ltd | |
US20190178394A1 (en) * | 2017-12-08 | 2019-06-13 | Kitz Sct Corporation | Fluid control valve and fluid control valve assembling method |
US10718438B2 (en) * | 2017-12-08 | 2020-07-21 | Kitz Sct Corporation | Fluid control valve and fluid control valve assembling method |
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Also Published As
Publication number | Publication date |
---|---|
WO2006083783A1 (en) | 2006-08-10 |
US20060169941A1 (en) | 2006-08-03 |
US7370664B2 (en) | 2008-05-13 |
TW200632243A (en) | 2006-09-16 |
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Owner name: SWAGELOK COMPANY, OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GLIME, WILLIAM H.;REEL/FRAME:021197/0065 Effective date: 20050405 |
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