F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/7
F16K 21/04 (2006.01) E03D 3/04 (2006.01) F16K 21/12 (2006.01)
Patent
CA 1250272
ABSTRACT A self-closing valve has a housing with an inlet and an outlet and a valve piston supported therein. The side of the valve piston furthest from the valve seat defines a relief chamber with the housing, the chamber being connected through flow channels to the inlet and the outlet which are so con- trolled in counter-flow by an auxiliary valve that the running time is determined by a retarded opening movement of the valve piston, closing being achieved by a rapid closing movement of the valve piston. The "on" position of the auxiliary valve control is achieved hydraulically with autoholding by the opening sequence of the valve piston by a pressure differential built up with the flow through the valve at a choke device. Interruption of this autohold switches the auxiliary valve con- trol. Any leakage flow that occurs at the autohold elements is passed unrestrictedly to the outlet through an additional valve that is opened when the auxiliary valve control is activated. This additional valve closes after interruption of the autohold and the switching of the auxiliary valve control that occurs when this takes place, so that any possible bypass flow parallel to the flow through the choke device for the flow through the valve is avoided.
461021
Fetherstonhaugh & Co.
Rost (georg) Und Sohne Armaturenfabrik G.m.b.h. Und Co. Kg
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