Safety valve actuator assembly
AssigneeBarber Industries Ltd.
InventorClarence W. Johnson
Life of this patent
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Abstract
An emergency shut-down system to close a gate valve in a pipeline and therefore terminate flow. The closing action is initiated when a pilot valve senses pressure in the pipeline outside predetermined limits. This reduces the signal pressure in the system which, in turn, causes a fluid dump from the gate valve actuator which closes the gate valve and terminates fluid flow in the pipeline. The system is reactivated by manually pumping the system which re-opens the gate valve and allows fluid flow in the pipeline to again continue.
Claims23
An actuator for opening and closing a valve, said actuator comprising a manually operated pump for pumping hydraulic fluid from a reservoir holding said hydraulic fluid to move a piston and a valve operated from said piston in a first direction and at least one spring to move said piston and said valve in a second direction opposed to said first direction, said spring being contained in said reservoir.
Dependencies are inferred from the claim text.