Some embodiments of a shutoff valve system for a fluid flow system can include a plug assembly that is biased to adjust from a first position in which the fluid flow path is open to a second position in which the fluid flow path is closed. The plug assembly may automatically adjust from the first po
Some embodiments of a shutoff valve system for a fluid flow system can include a plug assembly that is biased to adjust from a first position in which the fluid flow path is open to a second position in which the fluid flow path is closed. The plug assembly may automatically adjust from the first position to the second position in response to a downstream pressure condition.
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1. A shutoff valve system for a fluid flow system, comprising: a fluid flow path at least partially defined by an inlet and an outlet;a plug assembly that is biased, the plug assembly configured to adjust from a first position in which the fluid flow path is open to a second position in which the fl
1. A shutoff valve system for a fluid flow system, comprising: a fluid flow path at least partially defined by an inlet and an outlet;a plug assembly that is biased, the plug assembly configured to adjust from a first position in which the fluid flow path is open to a second position in which the fluid flow path is closed; anda trigger mechanism that is configured to move in response to a pressure condition, the trigger mechanism comprising a rotator shaft and a trigger shaft configured to impede rotation of the rotator shaft, each of the rotator shaft and the trigger shaft having a center axis that are parallel to one another, the rotator shaft configured to contact the plug assembly at a first interface and to contact the trigger shaft at a second interfacewherein the plug assembly is configured to automatically adjust from the first position to the second position in response to movement of the rotator shaft. 2. The shutoff valve system of claim 1, further comprising a seat positioned along the fluid flow path, wherein the plug assembly is movable along a generally linear path from the first position to the second position for closing the fluid flow path, wherein the plug assembly comprises a plug head to mate with the seat when the plug assembly is moved to the second position and at least one shaft coupled to the plug head, and wherein only a single ring seal member engages with the entire plug assembly. 3. The shutoff valve system of claim 1, further comprising: a regulator body that defines at least a portion of the fluid flow path between the inlet and the outlet,wherein the plug assembly and trip mechanism are housed together in a slam shut valve assembly, and wherein the entire slam shut valve assembly is removably coupled to the regulator body using only two mounting bolts. 4. A shutoff valve system, comprising: a fluid flow path at least partially defined by an inlet and an outlet;a seat positioned along the fluid flow path;a plug assembly that is biased, the plug assembly configured to adjust from a first position in which the fluid flow path is open to a second position in which the fluid flow path is closed, the plug assembly comprising a plug head to mate with the seat when the plug assembly is in the second position, a spring housing having an inner cylindrical surface portion and an outer cylindrical surface portion, and a spring at least partially positioned in the spring housing; anda trip mechanism having a trigger member that is configured to move in response to a pressure condition,wherein the plug assembly is configured to automatically adjust from the first position to the second position in response to movement of the trigger member, andwherein the plug head is configured to slidably engage with both the inner and outer cylindrical surface portions of the spring housing. 5. The shutoff valve system of claim 4, wherein trigger member is configured to move in the same direction in response to an underpressure condition and in response to an overpressure condition. 6. The shutoff valve system of claim 4, wherein the trigger member is coupled to a first sensing diaphragm and a second sensing diaphragm, and wherein the plug assembly is configured to automatically move in a linear path from the first position to the second position in response to an underpressure condition on the first sensing diaphragm and in response to an overpressure condition on the second sensing diaphragm. 7. The shutoff valve system of claim 4, wherein the trip mechanism is configured to retain the plug assembly in the first position, wherein, in response to a downstream fluid pressure condition, the trip mechanism is configured to release the plug assembly to travel in a linear path from the first position to the second position, wherein the trip mechanism comprises the trigger member and a rotator shaft that is pivotable about a pivot axis, and wherein the trigger member is movable relative to the rotator shaft. 8. The shutoff valve system of claim 7, wherein at least a first shaft portion of the plug assembly contacts the rotator shaft to urge the rotator shaft to pivot while the trigger member contacts the rotator shaft to resist rotation of the rotator shaft, and wherein the trigger member moves away from the rotator shaft in response to the downstream pressure condition so that the trip mechanism releases the plug assembly to move in a linear path from the first position to the second position. 9. The shutoff valve system of claim 4, wherein the plug assembly is biased to move in a longitudinal direction from the first position to the second position for closing the fluid flow path, wherein the system further comprises first and second sense diaphragms positioned in a lateral direction relative to the trigger member such that the trigger member is positioned generally laterally between the first and second sense diaphragms. 10. The shutoff valve system of claim 9, further comprising a first compression spring and a second compression spring, wherein the first compression spring is positioned laterally outside of the first sense diaphragm and opposite of the trigger member such that the first compression spring biases the first sense diaphragm toward the trigger member, and wherein the second compression spring is positioned laterally outside of the second sense diaphragm and opposite of the trigger member such that the second compression spring biases the second sense diaphragm toward the trigger member. 11. The shutoff valve system of claim 4, further comprising a viewing window that is configured to provide an externally visible indicator of the trip mechanism releasing the plug assembly to move to the second position. 12. A shutoff valve system for a fluid flow system, comprising: a fluid flow path at least partially defined by an inlet and an outlet;a plug assembly that is biased, the plug assembly comprising a plug, a main shaft coupled with the plug, and a reset shaft coupled with the main shaft, the plug configured to move in a linear path from a first position in which the fluid flow path is open to a second position in which the fluid flow path is closed;a trigger mechanism comprising a rotator shaft and a trigger shaft configured to impede rotation of the rotator shaft, each of the rotator shaft and the trigger shaft having a center axis that are parallel to one another, the rotator shaft configured to contact the plug assembly at a first interface and to contact the trigger shaft at a second interface; anda sensor assembly in communication with the trigger member, the sensor assembly having a first sensing diaphragm and a second sensing diaphragm, each coupled with the trigger shaft,wherein the trigger shaft is configured to release the rotator shaft to allow the plug to automatically move in the linear path from the first position to the second position in response to an underpressure condition on the first sensing diaphragm, andwherein the trigger shaft is configured to release the rotator shaft to allow the plug to automatically move in the linear path from the first position to the second position in response to an overpressure condition on the second sensing diaphragm. 13. The shutoff valve system of claim 12, wherein the inlet and the outlet are configured to be installed between a natural gas source and natural gas consuming equipment. 14. The shutoff valve system of claim 12, wherein the fluid flow path between the inlet and the outlet is at least partially defined by a regulator assembly and a body assembly, and wherein the regulator assembly includes a diaphragm that regulates fluid flow between the inlet and the outlet. 15. The shutoff valve system of claim 12, wherein the center axis of the rotator shaft is spaced apart from the first interface by a distance that is less than the distance from the center axis of the rotator shaft to the second interface. 16. A valve system to shutoff fluid flow in a fluid flow system, comprising: a fluid flow path at least partially defined by an inlet and an outlet;a plug assembly comprising a plug, a shaft coupled with the plug, and a spring that is configured to bias the plug to move in a linear path from a first position in which the fluid flow path is open to a second position in which the fluid flow path is closed; anda trigger mechanism that is configured to retain the plug in the first position and, in response to a downstream fluid pressure condition, is configured to release the plug to travel in the linear path from the first position to the second position,wherein the trigger mechanism comprises a rotator shaft and a trigger shaft configured to impede rotation of the rotator shaft, each of the rotator shaft and the trigger shaft having a center axis that are parallel to one another, the rotator shaft configured to contact the plug assembly at a first interface and to contact the trigger shaft at a second interface,wherein at, the first interface, the plug assembly contacts the rotator shaft to urge the rotator shaft to pivot while the trigger shaft contacts the rotator shaft to resist rotation of the rotator shaft, andwherein the trigger shaft is configured to move away from the rotator shaft in response to the downstream pressure condition so that the trip mechanism releases the plug to move in the linear path from the first position to the second position. 17. The valve system of claim 16, wherein the inlet and the outlet are configured to be installed between a natural gas source and natural gas consuming equipment. 18. The valve system of claim 16, wherein the fluid flow path between the inlet and the outlet is at least partially defined by a regulator assembly and a body assembly, and wherein the regulator assembly includes a diaphragm that regulates fluid flow between the inlet and the outlet. 19. The valve system of claim 16, wherein the center axis of the rotator shaft is spaced apart from the first interface by a distance that is less than the distance from the center axis of the rotator shaft to the second interface. 20. A slam-shut valve assembly, comprising: a plug assembly with a plug that is biased to move in a longitudinal direction from a first position to a second position for closing a fluid flow path;a trigger mechanism positioned proximate to the plug assembly, the trigger mechanism being movable so as to release the plug to travel toward the second position in response to a sensed pressure condition, the trigger mechanism comprising a rotator shaft and a trigger shaft configured to impede rotation of the rotator shaft, each of the rotator shaft and the trigger shaft having a center axis that are parallel to one another, the rotator shaft configured to contact the plug assembly at a first interface and to contact the trigger shaft at a second interface;first and second sense diaphragms positioned in a lateral direction relative to the trigger mechanism such that the trigger mechanism is positioned generally laterally between the first sense diaphragm and second sense diaphragm;a first compression spring positioned laterally outside of the first sense diaphragm and opposite of the trigger mechanism such that the first compression spring biases the first sense diaphragm toward the trigger mechanism; anda second compression spring positioned laterally outside of the second sense diaphragm and opposite of the trigger mechanism such that the second compression spring biases the second sense diaphragm toward the trigger mechanism. 21. The slam-shut valve assembly of claim 20, wherein the trigger mechanism is configured to move in the same direction both in response to an underpressure condition and in response to an overpressure condition. 22. The slam-shut valve system of claim 20, wherein the center axis of the rotator shaft is spaced apart from the first interface by a distance that is less than the distance from the center axis of the rotator shaft to the second interface. 23. A slam-shut valve system, comprising: a fluid flow path at least partially defined by an inlet and an outlet;a seat positioned along the flow path; anda plug assembly that is biased to move from a first position in which the fluid flow path is open to a second position in which the fluid flow path is closed; andwherein the plug assembly comprises: a plug head to mate with the seat when the plug assembly is moved to the second position,a spring holder member having an inner cylindrical surface portion and an outer cylindrical surface portion,a spring at least partially positioned in the spring holder member,wherein the plug head is configured to slidably engage with both the inner and outer cylindrical surface portions of the spring holder member,wherein the fluid flow path between the inlet and the outlet is at least partially defined by a regulator assembly and a body assembly, andwherein the regulator assembly includes a diaphragm that regulates fluid flow between the inlet and the outlet. 24. The slam-shut valve system of claim 23, wherein the inlet and the outlet are configured to be installed between a natural gas source and natural gas consuming equipment. 25. The shutoff valve system of claim 23, wherein the center axis of the rotator shaft is spaced apart from the first interface by a distance that is less than the distance from the center axis of the rotator shaft to the second interface. 26. A shutoff valve system for a fluid flow system, comprising: a fluid flow path at least partially defined by an inlet and an outlet;a seat positioned along the flow path; anda linearly movable plug assembly that is configured to, in response to a downstream pressure condition, automatically adjust along a linear path from a first position in which the fluid flow path is open to a second position in which the fluid flow path is closed; anda trigger mechanism configured to release the plug assembly to travel between the first position and the second position, the trigger mechanism comprising a rotator shaft and a trigger shaft configured to impede rotation of the rotator shaft, each of the rotator shaft and the trigger shaft having a center axis that are parallel to one another, the rotator shaft configured to contact the plug assembly at a first interface and to contact the trigger shaft at a second interface,wherein the plug assembly comprises a plug head that is configured to mate with the seat when the plug assembly is moved to the second position and at least one shaft coupled to the plug head, andwherein only a single ring seal member engages with the entire linearly movable plug assembly. 27. The shutoff valve system of claim 26, wherein the inlet and the outlet are configured to be installed between a natural gas source and natural gas consuming equipment. 28. The shutoff valve system of claim 26, wherein the fluid flow path between the inlet and the outlet is at least partially defined by a regulator assembly and a body assembly, and wherein the regulator assembly includes a diaphragm that regulates fluid flow between the inlet and the outlet. 29. The slam-shut valve assembly of claim 26, wherein the center axis of the rotator shaft is spaced apart from the first interface by a distance that is less than the distance from the center axis of the rotator shaft to the second interface. 30. A slam-shut valve system, comprising: a regulator body that defines a fluid flow path between an inlet and an outlet;a seat positioned along the flow path; anda slam shut valve assembly having a sensor assembly that is configured to detect a downstream pressure condition, a plug assembly that is configured to mate with the seat, and a trigger mechanism configured to release the plug assembly to travel between a first position and a second position, the trigger mechanism comprising a rotator shaft and a trigger shaft configured to impede rotation of the rotator shaft, each of the rotator shaft and the trigger shaft having a center axis that are parallel to one another, the rotator shaft configured to contact the plug assembly at a first interface and to contact the trigger shaft at a second interface,wherein, in response to the downstream pressure condition, the plug assembly is configured to automatically adjust from the first position in which the fluid flow path is open to the second position in which the fluid flow path is closed, andwherein the entire slam shut valve assembly is removably coupled to the regulator body using only two mounting bolts. 31. The slam-shut valve system of claim 30, wherein the inlet and the outlet are configured to be installed between a natural gas source and natural gas consuming equipment. 32. The slam-shut valve system of claim 30, wherein the fluid flow path between the inlet and the outlet is at least partially defined by a regulator assembly and a body assembly, and wherein the regulator assembly includes a diaphragm that regulates fluid flow between the inlet and the outlet. 33. A slam-shut valve assembly, comprising: a plug assembly that is biased to move in a longitudinal direction from a first position to a second position for closing a fluid flow path;a trigger mechanism that is configured to releasably engage with a component of the plug assembly, the trigger mechanism comprising a rotator shaft and a trigger shaft configured to impede rotation of the rotator shaft, each of the rotator shaft and the trigger shaft having a center axis that are parallel to one another, the rotator shaft configured to contact the plug assembly at a first interface and to contact the trigger shaft at a second interface, wherein, in response to a downstream pressure condition, the trigger mechanism is configured to automatically adjust to release the plug assembly move to the second position for closing the fluid flow path; anda viewing window that is configured to provide an externally visible indicator of the trip mechanism releasing the plug assembly to move to the second position. 34. The slam-shut valve assembly of claim 33, wherein the trigger shaft is configured to move in the same direction both in response to the downstream pressure condition being an underpressure condition and in response to downstream pressure condition being an overpressure condition.
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이 특허에 인용된 특허 (4)
Engdahl Paul D. ; Engdahl Roger P., Automatic safety shutoff valve.
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