Volume booster with variable asymmetry

摘要

A volume booster for a fluid flow control device comprises a supply path for supplying a fluid boost to facilitate actuation of an actuator in a first direction, and an exhaust path for enabling controlled exhaust to facilitate actuation of the actuator in a second direction. The supply path defines a supply resistance that is set by the geometry of a supply trim component. The exhaust path includes an exhaust resistance that is set by the geometry of an exhaust trim component. The supply and exhaust trim components are independently removable and replaceable with replacement components to customize the exhaust and supply resistances, and therefore, the exhaust and supply capacities for specific applications.

主权项

1. A fluid flow control device, comprising:
a body comprising an inlet port, a common port, and a discharge port; a supply path extending between the inlet port and the common port; an exhaust path extending between the common port and the discharge port; a supply port disposed within the body along the supply path between the inlet port and the common port; a control element disposed within the body and comprising a supply plug, an exhaust plug, and a stem connecting the supply plug and the exhaust plug, the control element adapted for displacement between a closed position whereby the supply plug is in sealing engagement with the supply port to close the supply path, and an open position whereby the supply plug is spaced from the supply port to open the supply path; a diaphragm assembly defining an exhaust port and disposed along the exhaust path between the common port and the discharge port, the diaphragm assembly comprising at least one diaphragm adapted for displacement between a first position, wherein the exhaust port is in sealing engagement with the control element to close the exhaust path, and a second position, wherein the exhaust port is spaced from the exhaust plug of the control element to open the exhaust path; a supply trim component removably attached to the body and defining a supply passage disposed along the supply path between the inlet port and the supply port; and an exhaust trim component disposed within the body and defining a control opening and an exhaust passage, the control opening configured to receive a portion of the control element, and the exhaust passage extending axially through the exhaust trim component and along the exhaust flow path between the common port of the body and the exhaust port of the diaphragm assembly, the exhaust passage having a first exhaust fluid flow resistance, the exhaust trim component removably attached to the body thereby enabling the exhaust trim component to be removed and substituted with another exhaust trim component having an exhaust passage with a second exhaust fluid flow resistance that is different than the first exhaust fluid flow resistance.