Patent ID: 6296008
Filing Date: 2001-10-02
Classification: F17C,Y10T

Abstract:
A valve for switching over from one supply of pressure fluid to another supply thereof in response to failing or failure of the one supply, said valve comprising:a valve body having two inlets for connection thereto of the respective supplies and an outlet;a valve member movable in the body between a position establishing communication for delivery of fluid from one inlet to the outlet and blocking flow from the other inlet to the outlet, and a position establishing communication for delivery of fluid from the other inlet to the outlet and blocking flow from the one inlet to the outlet;said valve member being subject to pressure of fluid supplied to said one inlet for moving it from the first-mentioned position to the second-mentioned position and to pressure of fluid supplied to the other inlet for moving it from the second-mentioned position to the first-mentioned position;a latch for latching the valve member in one or the other of said positions, said latch being movable between a latching position engaging the valve member and a retracted position clearing the valve member for movement;said latch being biased toward said retracted position and being held in latching position against the bias by pressure of fluid delivered by the valve member in one or the other of its said positions; andsaid latch moving to said retracted position under the bias upon a drop in pressure of fluid delivered by the valve member in either of its said positions.