Claims
- 1. A fluid flow control valve comprising:
a valve body having an inlet and an outlet; a valve opening and a cooperating movable valve closure member; a pressure chamber; and a sealing diaphragm connected between the valve closure member and the valve body to seal the pressure chamber, the diaphragm having a first portion which is disposed axially when the value is closed, and a second portion that is disposed radially when the valve is closed, the second portion being attached to and movable with the valve plug to cause the second portion to fold back onto the first portion when the valve is opened.
- 2. A flow control valve according to claim 1, wherein the length of the first portion of the diagram is approximately half the amount of the travel of the closure member from a fully open to a closed position.
- 3. A flow control valve according to claim 1, wherein:
the diaphragm includes an inner shoulder projecting inwardly from the second portion; the inner shoulder is received in a recess in the valve closure member; and the inner shoulder is sealingly affixed to the valve closure member by a retaining member that resiliently engages the shoulder against the recess.
- 4. A flow control valve according to claim 3, wherein:
the diaphragm includes an outer shoulder projecting outwardly from the first portion; and the outer shoulder is sealingly received in a recess defined by a portion of a wall of the valve body cavity, and a lip that is spaced from the cavity wall.
- 5. A flow control valve according to claim 3, wherein the first and second
portions of the diaphragm are supported against wall portions of the valve body when the valve is closed.
- 6. A flow control valve according to claim 1, wherein the first and second portions of the diaphragm are supported against wall portions of the valve body when the valve is closed.
- 7. A flow control valve according to claim 1, further including:
a bleed passage having a bleed orifice that communicates between the inlet side of the valve and the pressure cavity; and a filter screen covering the bleed passage which is positioned in flat alignment with a surface of the valve closure element to allow flow over the valve closure element surface to clean the filter screen.
- 8. A flow control valve according to claim 1, wherein:
a flow path through the valve body from the inlet to the outlet is substantially in a straight line; the valve opening is oriented obliquely to the flow path; and the motion of the valve closure element is along an axis perpendicular to the valve opening.
- 9. A flow control valve according to claim 8, further including a throttle mechanism for adjusting the maximum opening of the valve, the throttling mechanism being comprised of:
a rotatable actuating stem oriented at a right angle to the flow path of the valve; a handle for rotating the actuating stem oriented at a right angle to the actuating stem; a throttle element that moves along the axis of the valve closure element; and a bevel gear mechanism rotatable by the actuating stem to drive the throttle element.
- 10. A flow control valve according to claim 1, wherein:
the pressure chamber is formed by a cavity in the valve body and a top member, at least a portion of which is disposed in the valve body cavity; the valve body cavity is axially aligned with the valve opening; the valve body cavity is defined by a generally cylindrical axially extending wall, the valve body cavity wall includes an upper portion, a step portion, and a reduced diameter lower portion sized to slidingly receive the valve closure element therein with a predetermined small clearance; the first portion of the diaphragm is retained by, and substantially in contact with the upper portion of the body cavity wall and the second portion of the diaphragm is substantially in contact with, and supported by the step portion of the body cavity wall when the valve closure element is axially extended to close the valve; and the first portion of the diaphragm is partially displaced as the valve closure element retracts to open the valve.
- 11. A flow control valve according to claim 1, further including:
a bleed passage having a bleed orifice that communicates between the inlet side of the valve and the pressure cavity; and a filter screen covering the bleed passage which is positioned in flat alignment with a surface of the valve closure element to allow flow over the valve closure element surface to clean the filter screen.
- 12. A flow control valve according to claim 1, wherein the actuator for controlling the pressure differential between the inlet side of the valve and the pressure chamber includes a solenoid operated element that opens a venting port between the pressure cylinder and the outlet side of the valve when the solenoid is energized, and closes the venting port when the solenoid is deenergized.
- 13. A flow control valve according to claim 1, further including a throttle mechanism for adjusting the maximum opening of the valve.
- 14. A flow control valve according to claim 13, wherein:
the throttling mechanism includes a rotatable actuating stem; a gear mechanism drive by the actuating stem; and a throttling element which is axially driven by the gear mechanism to limit the movement of the valve closure element as it retracts to open the valve.
- 15. A flow control valve according to claim 14, wherein:
the linear motion of the valve closure element is along an axis perpendicular to the valve opening; the throttle mechanism actuating stem is oriented at a right angle to the flow path of the valve; and the gear mechanism includes:
a first bevel gear having an axis of rotation coincident with the axis of the throttle actuating stem; and a second bevel gear coupled to the first bevel gear, and having an axis of rotation coincident with the axis of the valve closure element.
- 16. A fluid flow control valve comprising:
a flow passage therethrough; a valve port opening; a valve plug cooperating with the valve port opening; and a sealing diaphragm for the valve plug,
the valve plug being movable by differential pressure there across to open and close the valve, the diaphragm being stepped in the direction of movement of the valve plug to provide an axial wall having a length equal to at least one-half the travel distance of the valve plug between the closed and open positions of the valve.
- 17. A valve according to claim 16, wherein the diaphragm includes a radially inwardly extending portion between one end of the axial wall and a surface of the valve plug extending in the direction of movement of the valve plug, the length of the radially extending portion being at least twice the thickness of the diaphragm.
- 18. A fluid flow control valve comprising:
a flow passage therethrough; a valve port opening; a valve plug cooperating with the valve port opening, and operable by differential pressure thereacross; a bleed passage for adjusting the differential pressure and a filter screen for the bleed passage,
the filter screen being positioned in flat alignment with a surface of the valve plug that seals the valve port opening whereby the screen is cleaned by the flow of fluid thereacross.
- 19. A fluid flow control valve comprising:
a housing; a fluid inlet; a fluid outlet; a fluid passage between the inlet and the outlet; a valve set area oriented obliquely in the fluid passage; a valve plug movable perpendicularly to the valve set area to close and open the valve; a sealing diaphragm for the valve plug; and a throttle mechanism, the throttle mechanism including:
a throttling mechanism linearly movable in the directions of movement of the valve plug; a rotatable operating shaft that extends in a direction perpendicular to the fluid passage; and a bevel gear mechanism coupled between the operating shaft and the throttling member that converts rotation of the operating shaft to linear movement of the throttling member.
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is based on and claims benefit of U.S. Provisional Patent Application No. 60/280,997 filed Apr. 4, 2001 entitled TILTED AND STEPPED DIAPHRAGM FOR CONTROL VALVES, the disclosure of which is hereby incorporated by reference and to which a claim of priority is hereby made.
Provisional Applications (1)
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Number |
Date |
Country |
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60280997 |
Apr 2001 |
US |