A flow control assembly can include a pilot-operated valve and a pilot control valve. The pilot-operated valve includes a closure element between inlet port and outlet ports of the pilot-operated valve and an actuating element adjacent to the closure element. The closure element can move between an
A flow control assembly can include a pilot-operated valve and a pilot control valve. The pilot-operated valve includes a closure element between inlet port and outlet ports of the pilot-operated valve and an actuating element adjacent to the closure element. The closure element can move between an open position allowing fluid flow between the inlet and outlet ports and a closed position preventing fluid flow between the inlet and outlet ports. A pilot pressure communicated to the actuating element can cause the actuating element to apply force that moves the closure element to the open position. The pilot control valve can include a closure element between inlet port and outlet ports of the pilot control valve. Communicating an actuation pressure to the closure element of the pilot control valve can open the pilot control valve. Opening the pilot control valve can allow communication of pilot pressure to the pilot-operated valve.
대표청구항▼
1. A flow control assembly comprising: a pilot-operated valve comprising: a first closure element positioned between a first inlet port and a first outlet port of the pilot-operated valve, the first closure element movable between an open position allowing fluid flow between the first inlet and outl
1. A flow control assembly comprising: a pilot-operated valve comprising: a first closure element positioned between a first inlet port and a first outlet port of the pilot-operated valve, the first closure element movable between an open position allowing fluid flow between the first inlet and outlet ports and a closed position preventing fluid flow between the first inlet and outlet ports, andan actuating element adjacent to the first closure element, the actuating element movable in response to communication of a pilot pressure to the actuating element via a pilot port of the pilot-operated valve, wherein the first closure element is movable to the open position in response to a force applied by movement of the actuating element; anda control valve comprising a second closure element positioned between a second inlet port and a second outlet port of the control valve, wherein the second closure element is movable to an open position allowing fluid flow between the second inlet and outlet ports in response to communication of an actuation pressure through the second inlet port to the second closure element,wherein the control valve is operable for allowing the communication of the pilot pressure to the pilot port in response to the second closure element being in the open position. 2. The flow control assembly of claim 1, wherein the first inlet port and the second inlet port are connectable to a common pressure source. 3. The flow control assembly of claim 1, further comprising a fluid communication path between the pilot port and the second outlet port; anda relief valve comprising: a third inlet port in fluid communication with the fluid communication path, anda third closure element selectively movable from an open position allowing fluid flow through the third inlet port and a closed position preventing fluid flow through the third inlet port,wherein the third closure element is movable to the closed position in response to a closing pressure being communicated to the third closure element, the closing pressure corresponding to the pilot pressure being communicated from the control valve to the pilot-operated valve via the fluid communication, andwherein the third closure element is movable to the open position in response to a pressure greater than an opening pressure and less than the closing pressure being communicated to the third closure element. 4. The flow control assembly of claim 3, further comprising a restrictor in fluid communication with a third outlet port of the relief valve, the restrictor operable for restricting a flow of fluid out of the fluid communication path between the pilot port and the second outlet port. 5. The flow control assembly of claim 1, further comprising: a fluid communication path between the pilot port and the second outlet port; anda restrictor in fluid communication with the fluid communication path. 6. The flow control assembly of claim 1, further comprising a restrictor in fluid communication with the first outlet port of the pilot-operated valve, the restrictor operable for restricting a fluid flow from the first outlet port of the pilot-operated valve by a specified amount of restriction. 7. The flow control assembly of claim 1, further comprising: a fluid communication path between the pilot port and the second outlet port;a bypass valve positioned in the fluid communication path between the pilot-operated valve and the control valve, the bypass valve comprising a bypass closure element movable from an open position allowing fluid flow through the bypass valve to the control valve and a closed position preventing fluid flow through the bypass valve to the control valve; andan additional control valve comprising a third closure element positioned between a third inlet port and a third outlet port of the additional control valve, wherein the third outlet port is in fluid communication with the bypass closure element,wherein the third closure element is movable to an open position allowing fluid flow between the third inlet port and the third outlet port to the bypass closure element in response to an additional actuation pressure being communicated to the third closure element, wherein the additional actuation pressure is greater than the actuation pressure for the control valve,wherein the bypass closure element is movable to the closed position in response to pressure communicated to the bypass closure element by the fluid flow from the third outlet port to the bypass valve. 8. The flow control assembly of claim 7, wherein the second inlet port of the control valve and the third inlet port of the additional control valve are connectable to a common pressure source. 9. The flow control assembly of claim 1, wherein the pilot-operated valve comprises a first check valve operable for allowing fluid flow from the first inlet port to the first outlet port and preventing fluid flow from the first outlet port to the first inlet port;wherein the control valve comprises a second check valve operable for allowing fluid flow from the second inlet port to the second outlet port and restricting fluid flow from the second outlet port to the second inlet port. 10. The flow control assembly of claim 1, wherein the control valve further comprises a reference port connectable to a fluid communication path from the first outlet port of the pilot-operated valve to a target tool, wherein the second closure element is movable in response to a first pressure at the second inlet port exceeding a second pressure at the reference port. 11. A flow control assembly comprising: a pilot-operated check valve comprising: a first closure element positioned between a first inlet port and a first outlet port of the pilot-operated check valve, the first closure element movable between an open position allowing fluid flow from the first inlet port to the first outlet port and a closed position preventing fluid flow from the first outlet port to the first inlet port, andan actuating element adjacent to the first closure element, the actuating element movable in response to communication of a pilot pressure to the actuating element via a pilot port of the pilot-operated check valve, wherein the first closure element is movable to the open position in response to a force applied by movement of the actuating element; anda pilot control check valve comprising a second closure element positioned between a second inlet port and a second outlet port of the pilot control check valve, wherein the second closure element is movable to an open position allowing fluid flow from the second inlet port to the second outlet port in response to communication of an actuation pressure through the second inlet port to the second closure element,wherein the pilot control check valve is operable for allowing the communication of the pilot pressure to the pilot port in response to the second closure element being in the open position. 12. The flow control assembly of claim 11, wherein the first inlet port and the second inlet port are connectable to a common pressure source. 13. The flow control assembly of claim 11, further comprising a fluid communication path between the pilot port and the second outlet port; anda relief valve comprising: a third inlet port in fluid communication with the fluid communication path, anda third closure element selectively movable from an open position allowing fluid flow through the third inlet port and a closed position preventing fluid flow through the third inlet port,wherein the third closure element is movable to the closed position in response to a closing pressure being communicated to the third closure element, the closing pressure corresponding to the pilot pressure being communicated from the pilot control check valve to the pilot-operated check valve via the fluid communication, andwherein the third closure element is movable to the open position in response to a pressure less than the closing pressure being communicated to the third closure element. 14. The flow control assembly of claim 13, further comprising a restrictor in fluid communication with a third outlet port of the relief valve, the restrictor operable for restricting a flow of fluid out of the fluid communication path between the pilot port and the second outlet port. 15. The flow control assembly of claim 11, further comprising: a fluid communication path between the pilot port and the second outlet port; anda restrictor in fluid communication with the fluid communication path, the restrictor operable for allowing a controlled fluid flow from the fluid communication path in response to a pressure lower than the pilot pressure being communicated from the second outlet port to the pilot port. 16. The flow control assembly of claim 11, further comprising a restrictor in fluid communication with the first outlet port of the pilot-operated check valve, the restrictor operable for restricting a fluid flow from the first outlet port of the pilot-operated check valve to a specified flow rate. 17. The flow control assembly of claim 11, further comprising: a fluid communication path between the pilot port and the second outlet port;a bypass valve positioned in the fluid communication path between the pilot-operated check valve and the pilot control check valve, the bypass valve comprising a bypass closure element movable from an open position allowing fluid flow through the bypass valve to the pilot control check valve and a closed position preventing fluid flow through the bypass valve to the pilot control check valve; andan additional pilot control check valve comprising a third closure element positioned between a third inlet port and a third outlet port of the additional pilot control check valve, wherein the third outlet port is in fluid communication with the bypass closure element,wherein the third closure element is movable to an open position allowing fluid flow between the third inlet port and the third outlet port to the bypass closure element in response to an additional actuation pressure being communicated to the third closure element, wherein the additional actuation pressure is greater than the actuation pressure for the pilot control check valve,wherein the bypass closure element is movable to the closed position in response to pressure communicated to the bypass closure element by the fluid flow from the third outlet port to the bypass valve. 18. The flow control assembly of claim 17, wherein the second inlet port of the pilot control check valve and the third inlet port of the additional pilot control check valve are connectable to a common pressure source. 19. The flow control assembly of claim 11, wherein the pilot-operated check valve is connectable to a pressure source and further comprising a check valve operable for allowing fluid flow from the pressure source to an injection mandrel and preventing fluid flow the injection mandrel to the pressure source, wherein the first outlet port of the pilot-operated valve is in fluid communication with the check valve. 20. An assembly for controlling injection of fluid to an injection mandrel, the assembly comprising: a check valve operable for allowing fluid flow from a pressure source to the injection mandrel and preventing fluid flow the injection mandrel to the pressure source;a pilot-operated valve comprising: a first closure element positioned between a first inlet port connectable to the pressure source and a first outlet port in fluid communication with the check valve, the first closure element movable between an open position allowing fluid flow between the pressure source and the check valve and a closed position preventing fluid flow between the pressure source and the check valve, andan actuating element adjacent to the first closure element, the actuating element movable in response to communication of a pilot pressure to the actuating element via a pilot port of the pilot-operated valve, wherein the first closure element is movable to the open position in response to a force applied by movement of the actuating element; anda pilot control valve comprising a second closure element positioned between a second inlet port connectable to the pressure source and a second outlet port in fluid communication with a pilot port of the pilot-operated valve, wherein the second closure element is movable to an open position allowing fluid flow between the second inlet and outlet ports in response to communication of an actuation pressure through the second inlet port to the second closure element,wherein the pilot control valve is operable for allowing the communication of the pilot pressure to the pilot port in response to the second closure element being in the open position.
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