Control valve having two independently driven valves

Details Control valve having two independently driven valves Control valve having two independently driven valves

F - Mech Eng,Light,Heat,Weapons

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F16K 11/22 (2006.01) F16K 1/44 (2006.01) F16K 31/363 (2006.01)

Patent

CA 1045616

A CONTROL VALVE HAVING TWO INDEPENDENTLY DRIVEN VALVES Abstract of the Disclosure The control valve has a quick-acting main valve and a safety valve which are independently operated either by the working medium which is being controlled or by an auxiliary pressure medium. The safety valve includes a rod which is secured to the piston of the safety valve drive and which extends through the piston of the servo-motor drive of the main valve. This rod has a longitudinal passage which communicates the upper chamber of the servo-motor for the safety valve with a discharge line for venting purposes or with the pressure medium in the upper chamber of the servo- motor of the main valve for closing purposes.

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