Patent ID: 11905782
Assignee: NATIONAL COUPLING COMPANY, INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC E  F | IPC E

Claim 23:
24. A method used for a subsea control module in a subsea environment, the method comprising:
activating an actuator for a gate valve by:
opening a directional control valve communicating a hydraulic fluid supply at an input with an output, and
reducing hydraulic pressure of the hydraulic fluid supply from the output to the actuator using a regulator having a supply in communication with the output and having an outlet in communication with the actuator; and

deactivating the actuator for the gate valve by:
closing the directional control valve communicating the output with a vent,
preventing communication of the hydraulic pressure at the outlet to the supply of the regulator using a seal arrangement in the regulator,
permitting at least a portion of the hydraulic pressure from the actuator to bypass the seal arrangement to the directional control valve through a check valve connecting the outlet to the supply of the regulator, and
expelling the hydraulic pressure bypassing the regulator from the vent of the directional control valve to the subsea environment.