Patent ID: 6358416
Filing Date: 2002-03-19
Classification: B01D,F02M,Y10T

Abstract:
A drain valve for a fuel filter water separator for an internal combustion engine, said fuel filter water separator having a housing defining a water collection space and a vent space, the housing having a wall with a drain opening therethrough for draining water from said water collection space, and having a vent opening therethrough and permitting incoming air to replace outgoing water, said engine having a running condition wherein said fuel filter water separator is pressurized, said engine having an off condition wherein said fuel filter water separator is not pressurized, said drain valve comprising a housing mounted to said fuel filter water separator housing and having a first port mating with said vent opening, a second port mating with said drain opening, and a third port, and an actuator member in said drain valve housing and actuable between a closed position blocking communication of said first port with said third port and blocking communication of said second port with said third port, and an open position providing communication of said first port with said third port and providing communication of said second port with said third port such that if said actuator member of said drain valve is actuated to said open position when said engine is in said off condition, collected water and vent air each flow through said third port in opposite directions, wherein said actuator member is a rotary piston rotatable about an axis, and comprising a vent passage having a first portion extending radially through said piston, relative to said axis, and a second portion extending axially along a gap between said piston and said drain valve housing.