Rotork ManPower range of manually energised spring-return actuators

The Rotork ManPower range of manually energised spring-return actuators is designed to reduce installation time and expense since no external electrical, hydraulic or pneumatic power supply is required. Suitable for a wide range of ball, butterfly and plug valves, the scotch-yoke actuators are equipped with a compact, self-contained, manually operated hydraulic power pack. A hydraulic hand pump on the power pack is used to operate the actuator and compress the failsafe spring, holding the valve in the desired open or closed position until a failsafe signal is received, at which point the spring will immediately drive the valve to the safe position.

Failsafe operation of ManPower units can be triggered by electrical signals, high- or low-pressure pilots or fire sensors, enabling the successful fulfilment of many ESD (emergency shutdown) and pressure-related protection duties in the oil, gas, petrochemical and pipeline industries.

Rotork ManPower actuators are available with output torques up to 45,000 Nm, with explosion-proof and watertight certification to international standards. A wide range of options includes local position indication, integral limit switches, speed control, high-speed operation, local electrical controls, manual reset and corrosion-resistant trims. Where space is restricted, the ManPower hydraulic module can be located separately from the valve. Standard units are suitable for a temperature range from -23 to +60ºC and equipped with built-in temperature compensation.