A fluid flow control device includes a trim cartridge, a diaphragm assembly, and a control element. The trim cartridge defines a cartridge supply port and an upper planar surface. The cartridge supply port is disposed along a supply path of the volume booster and the upper planar surface is disposed
A fluid flow control device includes a trim cartridge, a diaphragm assembly, and a control element. The trim cartridge defines a cartridge supply port and an upper planar surface. The cartridge supply port is disposed along a supply path of the volume booster and the upper planar surface is disposed along an exhaust of the volume booster. The diaphragm assembly defines an exhaust port on the exhaust path. The control element is movably disposed in the trim cartridge and includes a supply plug, an exhaust plug, and a stem. The supply plug engages the cartridge supply port and the exhaust plug engages the exhaust port. The exhaust plug further includes a lower planar surface that is coplanar with the upper planar surface of the trim cartridge.
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1. A fluid flow control device, comprising: a supply port for receiving a supply of pressurized fluid;an output port for delivering a supply of pressurized fluid;a vent port for venting a supply of pressurized fluid;a trim cartridge disposed between the supply port and the output port and between th
1. A fluid flow control device, comprising: a supply port for receiving a supply of pressurized fluid;an output port for delivering a supply of pressurized fluid;a vent port for venting a supply of pressurized fluid;a trim cartridge disposed between the supply port and the output port and between the output port and the vent port, the trim cartridge defining a cartridge supply port and an upper planar surface, the cartridge supply port being disposed along a supply path extending between the supply port and the output port, the upper planar surface disposed along an exhaust path extending between the output port, through the trim cartridge, and then the vent port;a diaphragm assembly disposed between the output port and the vent port, the diaphragm assembly defining an exhaust port along the exhaust path;a control element movably disposed in the trim cartridge, the control element including a supply plug, an exhaust plug, and a stem extending between the supply and exhaust plugs,the supply plug in selective engagement with the cartridge supply port of the cartridge, thereby closing the supply path,the exhaust plug in selective engagement with the exhaust port of the diaphragm assembly, thereby closing the exhaust path, the exhaust plug comprising a lower planar surface disposed at an interface between the exhaust plug and the stem, wherein during the selective engagement the lower planar surface of the exhaust plug being coplanar with the upper planar surface of the trim cartridge. 2. The device of claim 1, further comprising: an elastomeric supply component disposed between the supply plug of the control element and the cartridge supply port for providing a fluid tight seal; andan elastomeric exhaust component disposed between the exhaust plug of the control element and the exhaust port of the diaphragm assembly for providing a fluid tight seal. 3. The device of claim 2, wherein the elastomeric supply component is fixed to the supply plug of the control element and the elastomeric exhaust component is fixed to the exhaust plug of the control element. 4. The device of claim 1, further comprising: a body defining the supply port and the output port;a diaphragm housing defining the vent port and containing the diaphragm assembly; anda spring cap defining a control signal port. 5. The device of claim 4, further comprising a supply spring supported by the trim cartridge and engaging the control element for biasing the control element toward the cartridge supply port, and an exhaust spring disposed between the spring cap and the diaphragm assembly for biasing the exhaust port toward the control element. 6. The device of claim 4, wherein the diaphragm assembly comprises an instrument diaphragm, a feedback diaphragm, and a perforated spacer disposed between the instrument and feedback diaphragms, the feedback diaphragm in communication with the output port of the body and the instrument diaphragm in communication with the control signal port of the spring cap. 7. The device of claim 4, wherein the diaphragm housing includes a feedback cavity, in which the diaphragm assembly is movably disposed, the feedback cavity having a first cross-sectional dimension adjacent to the instrument diaphragm and a second cross-sectional dimension adjacent the feedback diaphragm, the second cross-sectional dimension greater than the first cross-sectional dimension. 8. A fluid flow control device, comprising: a body defining a supply port adapted to be coupled to at least one supply of pressurized air and an output port adapted to be coupled to an actuator of a control valve;a diaphragm housing coupled to the body and defining a vent port adapted to be in communication with a surrounding atmosphere;a spring cap coupled to the diaphragm housing and defining a control signal port adapted to receive a pneumatic control signal;a supply path extending between the supply and output ports of the body;an exhaust path extending between the output port of the body and the vent port of the diaphragm housing;a trim cartridge disposed within the body and defining a cartridge supply port and an upper planar surface, the cartridge supply port being disposed along the supply path between the supply and output ports of the body, the upper planar surface disposed along the exhaust path between the output port of the body, through the trim cartridge, and then the vent port of the diaphragm housing;a diaphragm assembly disposed within the diaphragm housing and defining an exhaust port disposed along the exhaust path between the output port of the body and the vent port of the diaphragm housing; anda control element disposed within the body and including a supply plug, an exhaust plug, and a stem extending between the supply and exhaust plugs, the exhaust plug comprising a lower planar surface at an interface between the exhaust plug and the stem,the control element and the diaphragm assembly movable in the body and the diaphragm housing, respectively, relative to a quiescent position, wherein a supply port seat load urges the supply plug into engagement with the cartridge supply port and an exhaust port seat load simultaneously urges the exhaust port of the diaphragm assembly into engagement with the exhaust plug of the control element to close the exhaust path,wherein the upper planar surface of the trim cartridge is aligned with the lower planar surface of the exhaust plug when the control element and the diaphragm assembly occupy the quiescent position. 9. The device of claim 8, wherein the control element and the diaphragm assembly are movable from the quiescent position to a supply position and a vent position, wherein when in the supply position, the exhaust port seat load urges the exhaust port into engagement with the exhaust plug and the supply plug into a position spaced from the cartridge supply port, andwhen in the vent position, the supply port seat load urges the supply plug into engagement with the cartridge supply port and an output pressure in the output port of the body overcomes the exhaust port seat load and urges the exhaust port into a position spaced away from the exhaust plug. 10. The device of claim 9, further comprising: an elastomeric supply component disposed between the supply plug of the control element and the cartridge supply port of the trim cartridge for providing a fluid tight seal when in the quiescent and vent positions; andan elastomeric exhaust component disposed between the exhaust plug of the control element and the exhaust port of the diaphragm assembly for providing a fluid tight seal when in the quiescent and supply positions. 11. The device of claim 10, wherein the elastomeric supply component is fixed to the supply plug of the control element and the elastomeric exhaust component is fixed to the exhaust plug of the control element. 12. The device of claim 8, wherein a magnitude of the exhaust port seat load varies in proportion to an output pressure present in the output port and a magnitude of the supply port seat load varies in inverse proportion to the output pressure. 13. The device of claim 8, further comprising a supply spring supported by the trim cartridge and engaging the control element for biasing the control element toward the cartridge supply port, and an exhaust spring disposed between the spring cap and the diaphragm assembly for biasing the exhaust port toward the control element. 14. The device of claim 8, wherein the diaphragm assembly comprises an instrument diaphragm, a feedback diaphragm, and a perforated spacer disposed between the instrument and feedback diaphragms, the feedback diaphragm in communication with the output port of the body and the instrument diaphragm in communication with the control signal port of the spring cap. 15. The device of claim 8, wherein the diaphragm housing includes a feedback cavity, in which the diaphragm assembly is movably disposed, the feedback cavity having a first cross-sectional dimension adjacent to the instrument diaphragm and a second cross-sectional dimension adjacent the feedback diaphragm, the second cross-sectional dimension greater than the first cross-sectional dimension. 16. A fluid process control system, comprising: a control valve;an actuator operably connected to the control valve, the actuator including a piston, a first control port in fluid communication with a first surface of the piston, and a second control port in fluid communication with a second surface of the piston;a primary source of pressurized fluid for actuating the actuator during a normal operating mode;a secondary source of pressurized fluid for actuating the actuator during a trip mode;a first volume booster connected in fluid communication with the first control port of the actuator and the primary source of pressurized fluid, the first volume booster adapted to boost a volume of pressurized fluid delivered to the first control port from the primary source of pressurized fluid during the normal operating mode;a second volume booster connected in fluid communication with the second control port of the actuator, the primary source of pressurized fluid, and the secondary source of pressurized fluid, the second volume booster adapted to boost the volume of pressurized fluid delivered to the second control port from the primary source of pressurized fluid during the normal operating mode and the secondary source of pressurized fluid during the trip mode; anda positioner having an inlet port in fluid communication with the primary source of pressurized fluid, a first outlet port in fluid communication with an inlet connection of the first volume booster, and a second outlet port in fluid communication with an inlet connection of the second volume booster, the positioner adapted to deliver a pneumatic signal to the first and second volume boosters during the normal operating mode of the system for controlling the control valve;each of the first and second volume boosters comprising a supply port, an output port, a vent port, a trim cartridge, a diaphragm assembly, and a control element,the trim cartridge defining a cartridge supply port and an upper planar surface, the cartridge supply port being disposed along a supply path of the volume booster extending between the supply port and the output port, the upper planar surface disposed along an exhaust path of the volume booster extending between the output port, through the trim cartridge, and then the vent port;the diaphragm assembly defining an exhaust port disposed along the exhaust path between the output port and the vent port, andthe control element being movably disposed within the trim cartridge and including a supply plug for selectively engaging the cartridge supply port of the trim cartridge, an exhaust plug for selectively engaging the exhaust port of the diaphragm assembly, and a stem extending between the supply and exhaust plugs, the exhaust plug comprising a lower planar surface at an interface between the exhaust plug and the stem, the lower planar surface disposed in alignment with the upper planar surface of the trim cartridge when the supply plug and the exhaust plug simultaneously engage the cartridge supply port and the exhaust port, respectively. 17. The system of claim 16, wherein the control element and the diaphragm assembly are movable between a quiescent position, a supply position, and a vent position, wherein when in the quiescent position, a supply port seat load urges the supply plug into engagement with the cartridge supply port and an exhaust port seat load simultaneously urges the exhaust port into engagement with the exhaust plug,when in the supply position, the exhaust port seat load urges the exhaust port into engagement with the exhaust plug and the supply plug into a position spaced from the cartridge supply port, andwhen in the vent position, the supply port seat load urges the supply plug into engagement with the cartridge supply port and an output pressure in the output port of the volume booster overcomes the exhaust port seat load and urges the exhaust port into a location spaced away from the exhaust plug. 18. The system of claim 17, wherein, during the trip mode, the control element and the diaphragm assembly occupy the vent position. 19. The system of claim 16, wherein the supply port seat load of the first volume booster during the trip mode is greater than the supply port seat load of the first volume booster during the normal operating mode, andthe exhaust port seat load of the second volume booster during the trip mode is greater than the exhaust port seat load of the second volume booster during the normal operating mode. 20. The system of claim 16, further comprising an elastomeric supply component associated with the supply plug, and an elastomeric exhaust component associated with the exhaust plug. 21. The system of claim 16, wherein, for each of the first and second volume boosters, the supply port seat load and the exhaust port seat load is the same during the normal operating mode. 22. The system of claim 16, wherein each of the first and second volume boosters further comprises: a body defining the supply port, the supply port being coupled to the primary and secondary sources of pressurized air, and the output port, the output port being coupled to one of the first and second control ports of the actuator;a diaphragm housing defining the vent port, the vent port being in communication with the atmosphere;a spring cap defining a control signal port coupled to one of the first and second fluid outlet ports of the positioner. 23. The system of claim 22, wherein the diaphragm assembly of each of the first and second volume boosters comprises an instrument diaphragm, a feedback diaphragm, and a perforated spacer disposed between the instrument and feedback diaphragms, the feedback diaphragm in communication with the output port and the instrument diaphragm in communication with the control signal port. 24. The system of claim 22, wherein the diaphragm housing of each of the first and second volume boosters includes a feedback cavity, in which the diaphragm assembly is movably disposed, the feedback cavity having a first cross-sectional dimension adjacent to the instrument diaphragm and a second cross-sectional dimension adjacent the feedback diaphragm, the second cross-sectional dimension greater than the first cross-sectional dimension. 25. The system of claim 16, wherein a magnitude of the exhaust port seat load varies in proportion to an output pressure present in the output port and a magnitude of the supply port seat load varies in inverse proportion to the output pressure. 26. The system of claim 22, wherein each of the first and second volume boosters further comprises a supply spring supported by the trim cartridge and engaging the control element for biasing the control element toward the cartridge supply port, and an exhaust spring disposed between the spring cap and the diaphragm assembly for biasing the exhaust port toward the control element.
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이 특허에 인용된 특허 (6)
Junk,Kenneth W., Asymmetric volume booster arrangement for valve actuator.
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