Patent ID: 7913973
Filing Date: 2011-03-29
Classification: F16K

Abstract:
1. A reverse primary flow pressurized media driven valve, comprising: a housing having internal routing for separate flows of actuator media and primary media, the primary media entering the housing through an inlet port; an actuator disposed within the housing for movement in response to flow of the actuator media; a nozzle body disposed in the housing and having an inlet passageway in communication with the inlet port so as to direct inlet flow of the primary media to a metering section of the nozzle body; and a metering member disposed in the housing for movement by the actuator with respect to the nozzle body between an open position and a closed position in which the metering member engages the metering section to close off the inlet flow of the primary media, wherein the metering member moves essentially parallel to the inlet flow of the primary media and essentially counter to the inlet flow of primary media when moving toward the nozzle body and wherein the metering member has a contoured head defining a convex flow metering surface extending axially from a leading end to a contoured shut-off section, wherein the shut-off section defines a constant diameter transition section extending axially from the flow metering surface to a seat projecting radially outward for engagement with the nozzle body when in the closed position.