SUBMERGED HYDRAULIC SYSTEM

摘要

A static seal for a power fluid operated actuator is arranged in a cylinder to close off the space between a piston and a cylinder in which the piston reciprocates at the end of the power stroke of the piston. The piston has a fixed stroke and may be used to actuate apparatus requiring definite movements, such as valves and flow diverters. The piston may be single or double acting. For remote underwater operations, the actuator is connected into a closed hydraulic system which also includes a hydraulic reservoir, an electrically powered pump and a hydraulic accumulator to furnish hydraulic power fluid to the cylinder. Electrically operated valves are used to direct the flow of power fluid in the proper directions. The piston is spring-loaded to permit the piston to exhaust the cylinder and return the piston to its initial position to operate automatically the apparatus being actuated in the event of power failure.