Patent ID: 6655656
Filing Date: 2003-12-02
Classification: F16L,Y10T

Abstract:
A quick disconnect female coupler comprising:a housing; a valve body axially movable in the housing, the valve body having a main cavity and a poppet valve seat at the forward end of the main cavity; a poppet valve axially movable in the valve body toward and away from the poppet valve seat; a piston for forwardly urging the poppet valve toward the poppet valve seat upon application of pressurized fluid to the rear side of the piston; a flow passage for supplying pressurized fluid from the main cavity to the back side of the piston; a trap seal valve seat; and a resilient wiper seal engageable with the trap seal valve seat to block reverse flow of pressurized fluid from behind the piston to the main cavity while permitting flow of pressurized fluid from the main cavity to the rear side of the piston, the wiper seal being retained in a radially opening annular groove and including at its rear side an annular recess that allows rearward rolling of the wiper seal in the annular groove when the wiper seal is subjected to a surge of high pressure fluid from the main cavity to the back side of the piston, whereby the wiper seal moves out of the way of the high pressure fluid surge to avoid being forced out of the annular groove.