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A quick release valve for a vehicle fluid pressure braking system includes a housing having inlet, exhaust and delivery ports. A bead circumscribes the inlet port to provide a valve seating area for a flexible diaphragm within the valve housing, and the exhaust port includes a projecting portion whi

A quick release valve for a vehicle fluid pressure braking system includes a housing having inlet, exhaust and delivery ports. A bead circumscribes the inlet port to provide a valve seating area for a flexible diaphragm within the valve housing, and the exhaust port includes a projecting portion which preloads the flexible diaphragm into engagement with the bead circumscribing the inlet port. Accordingly, pressure variations between the ports cannot force the flexible diaphragm to vibrate to create an undesirable honking noise. Furthermore, the circumferentially extending bead assures a pressure-tight seal with the flexible diaphragm, and also establishes a predetermined sealing area for the diaphragm, thereby reducing valve hysteresis by preventing sealing of the diaphragm at varying areas on the housing.

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Quick release valve assembly comprising a housing defining a chamber therewithin, an inlet port and an exhaust port in said housing and communicating with said chamber on substantially opposite sides thereof, a delivery port communicated with said chamber between the inlet and outlet ports, a flexib

Quick release valve assembly comprising a housing defining a chamber therewithin, an inlet port and an exhaust port in said housing and communicating with said chamber on substantially opposite sides thereof, a delivery port communicated with said chamber between the inlet and outlet ports, a flexible diaphragm positioned in said chamber between the inlet and outlet ports and adapted to control communication through the inlet and exhaust ports in response to changes in the pressure differentials between the inlet, delivery and exhaust ports, inlet and exhaust annular valve seating areas circumscribing said inlet and exhaust ports respectively, said housing including a projecting portion circumscribed by the exhaust valve seating area and projecting through the plane defined by said exhaust valve seating area, said projecting portion engaging said flexible diaphragm to exert a preload force on the latter urging it toward the inlet valve seating area, but permitting the flexible diaphragm to wrap around said projecting portion to engage the exhaust valve seating area to close communication through the exhaust port.