Flow control valves
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Accused Products
Abstract
In one embodiment, a flow control valve includes a valve body having an inlet, an outlet, a flow passageway coupling the inlet to the outlet, and a cavity with first and second chambers. The valve further includes a hollow piston disposed in the first chamber and a seal separating the first and second chambers. The seal has a section within the piston that is exposed to the fluid in the first chamber. The section of the seal defines a first effective area. The valve also includes a biasing member configured to urge the piston, and a reference pressure passageway in fluid communication with the inlet and the second chamber. The valve can further include a piston seat that has a second inner effective area at least approximately equal to the first inner effective area.
76 Citations
56 Claims
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1-50. -50. (canceled)
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51. A valve, comprising:
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a valve body having an inlet, an outlet, a flow passageway coupling the inlet to the outlet, and a cavity intersecting the flow passageway, the cavity having a first chamber and a second chamber, the second chamber having a generally hollow configuration;
a piston assembly including a hollow piston body, a support member coupled to the hollow piston body, and a poppet coupled to the support member, the hollow piston body being disposed in the second chamber, the support member and the poppet being disposed in the first chamber;
a seal having a hollow section separating the first and second chambers, the hollow section having a first effective inner area;
a biasing member configured to urge the hollow piston body toward the first chamber;
a reference pressure passageway in fluid communication with the outlet and the second chamber; and
a piston seat positioned to selectively engage the poppet, the piston seat enclosing a second effective inner area at least approximately equal to the first effective inner area. - View Dependent Claims (52, 53, 54, 55, 56)
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Specification