An exercisable check valve having a fluid delivery test channel and piston closure is disclosed herein. A valve closure member stops flow through the valve in the presence of backwards pressure or when engaged by the piston. The valve may be tested by applying a pressure source to the fluid delivery
An exercisable check valve having a fluid delivery test channel and piston closure is disclosed herein. A valve closure member stops flow through the valve in the presence of backwards pressure or when engaged by the piston. The valve may be tested by applying a pressure source to the fluid delivery test channel to cause the piston to engage the valve closure member and stop flow through the valve. A test rod may then be inserted into a test rod port to ensure the valve closure member is in the proper closed position. The check valve may also include a biasing element to bias the valve closure member to an open position and a drainage channel. The check valve may be used in any piping or valve system.
대표청구항▼
1. An exercisable check valve comprising: a valve body having an inlet, an outlet, and a flow passage between and fluidly connecting said inlet and said outlet;a valve closure member received in said flow passage, said valve closure member being movable between at least an open position in which flu
1. An exercisable check valve comprising: a valve body having an inlet, an outlet, and a flow passage between and fluidly connecting said inlet and said outlet;a valve closure member received in said flow passage, said valve closure member being movable between at least an open position in which fluid may flow through said flow passage and a closed position in which said valve closure member cooperates with said valve body such that fluid flow through said flow passage is interrupted;a support member positioned on a downstream side of said valve closure member; anda piston assembly for selectively moving the valve closure member between the open position and the closed position, the piston assembly comprising: a piston bore defined in the support member and positioned within said flow passage,a piston coupled to said valve closure member, said piston being movable between at least a first position and a second position and being at least partially received in and movable relative to said piston bore, wherein movement of said piston to said second position causes said valve closure member to move to said closed position, andat least one fluid delivery test channel fluidly connecting an exterior of said valve body to an interior of said piston bore; wherein said piston comprises a shaft having a first shaft end extending into and terminating within said piston bore. 2. The check valve of claim 1, further comprising a biasing element adapted for normally biasing said valve closure member to said open position. 3. The check valve of claim 2, wherein said closure member comprises a valve closure disc, said biasing element engages said valve closure disc on an upstream side of said valve closure disc, and said piston bore is disposed on a downstream side of said of valve closure disc. 4. The check valve of claim 1, wherein the valve closure member comprises a valve closure disc. 5. The check valve of claim 4, further comprising a valve closure disc seat, wherein said valve closure disc is adapted for engaging said valve closure disc seat when said valve closure disc is in said closed position. 6. The check valve of claim 1, wherein said piston further comprises a second shaft end, and wherein said valve closure member is coupled to said piston between said first shaft end and said second shaft end. 7. The check valve of claim 6, wherein the support member is a downstream support member and wherein the check valve further comprising an upstream support member, the downstream support member, and a biasing element adapted for normally biasing said valve closure member to said open position, wherein said piston bore extends into said downstream support member, said piston assembly extends through said upstream support member, and said biasing element is coupled to said upstream support member. 8. The check valve of claim 1, wherein said piston comprises a first portion extending from the valve closure member to the first shaft end, the first portion being at least partially received in said piston bore with a close fit between an outer surface of said piston and an inner surface of said piston bore. 9. The check valve of claim 8, wherein the first portion of the piston is in the shape of a cylinder. 10. The check valve of claim 1, further comprising at least one inspection port fluidly connecting an exterior of said valve body and an interior of said flow passage. 11. The check valve of claim 1, wherein: said support member is a downstream support member positioned on the downstream side of said valve closure member and said piston bore is defined in said downstream support member; andthe check valve further comprises a biasing element adapted for normally biasing said valve closure member to said open configuration, andan upstream support member positioned on an upstream side of said valve closure member in said flow passage, wherein said biasing element is coupled to said upstream support member. 12. The check valve of claim 1, wherein said fluid delivery test channel is oriented perpendicularly to said piston bore. 13. The check valve of claim 1, wherein said piston bore defines a cavity with an end wall and a cavity opening through which the piston first shaft end is received into the bore, wherein the first shaft end is movable relative to said end wall. 14. The check valve of claim 1, wherein said piston bore defines a cavity with an end wall and a cavity opening through which the piston first shaft end is received into the bore, wherein a gap exists between the end wall of the bore and the first shaft end permitting movement of said shaft end relative to the bore end wall. 15. An exercisable check valve comprising: a valve body having an inlet, an outlet, and a flow passage between and fluidly connecting said inlet and said outlet;a valve closure member received in said flow passage, said valve closure member being movable between at least an open position in which fluid may flow through said flow passage and a closed position in which said valve closure member cooperates with said valve body such that fluid flow through said flow passage is interrupted;a piston assembly for selectively moving the valve closure member between the open position and the closed position;at least one fluid delivery test channel fluidly connecting an exterior of said valve body to an interior of a piston bore;a biasing element adapted for normally biasing said valve closure member to said open position; anda support member positioned on an upstream side of said valve closure member in said flow passage, wherein said biasing element is coupled to said support member. 16. The check valve of claim 15, wherein said biasing element is a compression spring. 17. A method for testing operation of a check valve having a valve body having an inlet, an outlet, and a flow passage between and fluidly connecting said inlet and said outlet and a valve closure member received in said flow passage, said valve closure member being movable between at least an open position in which fluid may flow through said flow passage and a closed position in which said valve closure member cooperates with said valve body such that fluid flow through said flow passage is interrupted, the method comprising: introducing a fluid under pressure into a piston bore through at least one fluid delivery test channel;moving a piston within the flow passage by the introduced fluid under pressure, the piston being at least partially received in and movable relative to the piston bore and comprising a free end within the piston bore, there being a gap defined in the piston bore between the piston free end and the downstream end of the bore, wherein the introducing the fluid under pressure into the piston bore comprises introducing fluid under pressure into the gap causing a force to act on the free end; andengaging the valve closure member by the piston to move the valve closure member to the closed position in response to moving of the piston.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.