Quarter-Turn Hydraulic Actuator

The “Quarter-Turn Hydraulic” valve actuator is ideal for operating valves where utilizing hi-pressure natural gas as a power media presents a safety concern, for instance in a closed environment. The “Quarter-Turn Hydraulic Actuator” is designed to operate with pressures up to 1500 psi, providing torque outputs over 1 million inch-pounds. This hydraulic actuator provides the optimum size to output torque for operating pipeline ball valves.

Canted Scotch Yoke Design

The canted scotch yoke mechanism provides high breakaway torque at the beginning stroke resulting in smaller cylinders, which reduces cost. All hydraulic actuators utilize teflon impregnated, sintered bronze bushings on a heavily chrome-plated guide bar to absorb any side loads guaranteeing smooth operation and longer cycle life.

Linear Travel Stops

The externally adjustable travel stops are on center with the piston rod, eliminating side loading to the scotch yoke. Located at either end of the actuator, these travel stops provide precise adjustment. Both the ‘open’ and ‘close’ travel stops are independently adjustable.

Electrolysis Nickel Plated Cylinders

The cylinder walls are electroless nickel plated and precision honed to ensure long lasting, trouble free service. All pistons are furnished with a teflon impregnated graphite guide ring (wear band) that eliminates any possible metal to metal contact. The piston and rod seals are made of teflon rings preloaded by an “O” ring suitable for the most severe working conditions.

Manual Hand Pump

Each hydraulic actuator is equipped with a manual hand pump and hydraulic oil reservoir. When pipeline pressure is not available, the manual hand pump can be used to safely and reliably open and close the valve at its maximum torque requirement.