Valve

Details Valve Valve

F - Mech Eng,Light,Heat,Weapons

16

K

137/130

F16K 11/00 (2006.01) A62B 9/02 (2006.01) B60T 17/18 (2006.01) F16K 31/363 (2006.01) F17C 13/04 (2006.01)

Patent

CA 1319584

ABSTRACT A valve of the kind for controlling the flow of fluid from at least two alternative supplies in such a manner that reduction or cessation of one supply automatically causes the valve to switch to another of the alternative supplies comprises a cylinder having a piston slidable therein in a region between a first fluid inlet and a second fluid inlet. The piston has working surfaces of differential area such that equal pressure on both sides of the piston biases the piston to one end of the cylinder. The valve has a fluid outlet with a first fluid flow path from the first fluid inlet to the fluid outlet, and a second fluid flow path from the second fluid inlet to the fluid outlet and including an axial outlet bore. The second fluid flow path is closable by the piston and is opened upon axial movement of the piston towards the first fluid inlet which is caused when the supply of fluid from the first fluid inlet fails, is arrested or falls below a predetermined limit. The first fluid flow path of the valve is permanently open thus rendering the valve fail safe. The axial outlet bore of the second fluid flow path is formed through the piston and is closable by a seal in the cylinder against which an end of the piston is adapted to abut thus ensuring a compact valve construction.

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