asymmetric volume booster assembly for valve actuator having first and second boosters

摘要

asymmetric volume booster assembly an asymmetric volume booster assembly includes a differential actuator (24) displaceable in a first direction and a second direction, a first reinforcer (44) in fluid communication with the actuator, and a second reinforcer (48) in fluid communication with the actuator, and a second booster in fluid communication with the actuator. the first booster includes a first feed passage (60) and a first exhaust passage, wherein the first feed passage supplies fluid to the actuator and the first exhaust passage discharges fluid from the actuator. The first exhaust passage is configured to produce a first fluid flow resistance. the second booster includes a second feed passage (58) and a second exhaust passage, wherein the second supply passage provides fluid to the actuator and the second exhaust passage discharges fluid from the actuator. the second exhaust passage is configured to produce a second fluid flow resistance. the first fluid flow resistance is greater than the second fluid flow resistance such that the actuator moves substantially symmetrically in the first direction and the second direction.