Valves and valve actuation – Fluid actuated or retarded – Compulsory cut-off after flow period
Patent
1984-08-20
1986-03-25
Scott, Samuel
Valves and valve actuation
Fluid actuated or retarded
Compulsory cut-off after flow period
251 22, 251 48, F16K 2104
Patent
active
045778299
ABSTRACT:
A self closing valve has a housing with a water inlet and outlet and with a valve piston positioned inside it in such a way that the end of the piston facing away from the valve seat demarcates a discharge chamber in conjunction with the inlet and outlet through flowthrough passages that are activated in opposite directions by supplementary-valve controls in such a way that the duration of operation is determined by a decelerated opening stroke of the valve piston and closure is activated by a rapid closing stroke of the valve piston. The initiating position of the supplementary-valve controls that is provided during the opening activation of the valve piston is designed to maintain itself hydraulically as the result of a pressure difference generated at a choking device as the result of the flow through the valve and discontinuing the automatic maintenance shifts the supplementary-valve controls. Any leakage flows that may occur at the self-maintaining members are diverted to the outlet, without being choked off, through the supplementary valve that is opened by means of the initiating position of the supplementary-valve controls and the supplementary valve closes once self-maintenance and the shift in the supplementary-valve controls that is provided thereby have been discontinued, eliminating any potential bypass flow parallel to the flow through the choking device on the part of the flow through the valve.
REFERENCES:
patent: 1273140 (1918-07-01), Brooks
patent: 1385456 (1921-07-01), Kellan
patent: 2204191 (1940-06-01), Sloan et al.
Georg Rost und Soehne Armaturenfabrik GmbH und Co. KG.
Kamen Noah
Scott Samuel
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