Spring centralised control valve for shipboard valves - has control valve operated pneumatically via pressure valves and has three selection positions

摘要

A valve to control the drive mechanisms of cut-off valves, seat, and slide valves on ships, is a spring-centralised control valve with three selection positions, which is hydraulically operated and controlled by the pressure valves. One of the pressure valves, which fixes the central pressure for one central chamber of the control valve, is so connected with the movable part of the drive mechanism that each position of the movable part of the drive mechanism corresponds to a given pressure position of the pressure valve. The control valve is operated pneumatical ally via the pressure valves.