Hydraulically operated electrical switch - has control valve allowing response even to brief press. changes

摘要

The hydraulically-operated electrical switch responds even to brief pressure changes, and consists of a main valve controlled by a control valve and allowing the hydraulic fluid to pass through to the piston that operates the switch. - The control valve has surfaces that are put under pressure when the valve opens. This hydraulic pressure holds the valve open. The piston housing has holes that lead into the piston chamber and prevent the control valve being held open when a given position is reached.