Typically installed in sea water desalination plants and hydropower plants, counterweight actuators are provided for the actuation of big size valves often working as combined check valves.
Fabricated steel construction is provided with single acting hydraulically operated cylinder, equipped with suitable hydraulic control manifolds to obtain a closing stroke with different speed to avoid the presence of hammer effect inside main process piping, allowing the actuators to act also as a damper to protect installation structures from undesirable stress and over pressure.