F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/39.1
F16K 11/02 (2006.01)
Patent
CA 1058478
ABSTRACT OF THE DISCLOSURE A pilot valve mechanism for controlling the flow of a pressure medium responsive to predetermined variations in a pressurized system. The pilot valve mechanism is constructed in such manner that a plurality of pilot valves may be connected in assembly and may be operative to shut down operation of a flow system responsive to sensing of pressure that are above or below a predetermined range of operating pressure. Each of the valves may include a shuttle valve mechanism capable of interrupting fluid communication between the inlet and outlet of the pilot valve mechanism or between the outlet and vent of the valve assembly, depending upon the position of a shuttle valve actuating piston that is proportionally movable responsive to variations in the pressure that is sensed by the pilot valve mechanism. Movement of the piston and shuttle valve to the various positions thereof may be controlled by an urging means that may be adjustably preset for a particular high or low pressure. The shuttle valve may incorporate annular end seals that are retained in assembly with the shuttle valve and engage annular seal sur- faces, defined within the valve body of the valve assembly, to control fluid communication between the various ports. Slight movement of the end seals of the shuttle valve away from the annular sealing surfaces affords substantial cross-sectional flow area for large volume flow, thus providing for rapid pressure responsive actuation. Utilization of piston sealing elements having low friction characteristics and utilization of a tension spring for urging the shuttle valve and piston between operative positions thereof, facilitated accurate operation of the pilot valve mechanism at relatively narrow pressure differentials.
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