Rotork fluid power actuator Rack and pinion actuators 

Rack and pinion actuators often offer the most economical solution for quarter-turn valves that have a fairly constant torque requirement throughout the stroke.

RH rack and pinion hydraulic actuators are engineered to operate ball, butterfly, plug and other quarter-turn valves for either on/off or modulating service. The heavy-duty construction and compact design make this product ideal for skid manufacturers as well as offshore and process applications which require robust yet space saving valve actuation solutions.

RH actuators are available in five body sizes to produce torque output up to 3,700 Nm (29,900 lbf.in) at operating pressures up to 250 bar (3,625 psi). They are available in either double-acting or spring-return configurations.

Heavy-duty cast iron bodies

Electroless nickel-plated cylinders for corrosion resistance

Totally enclosed weatherproof housing

Valve mounting dimensions per ISO 5211 DIN 3337

Complies with EN60529 (1991) + (A1:2000) for IP67M

Certified suitable for use in SIL3 as a single device in accordance with IEC 61508

Actuators certified to ATEX 2014/34/EU and PED 97/23/EC

RH actuators are designed for some of the most challenging valve actuation applications on earth. They are an excellent choice for the demanding requirements and adverse conditions found in applications for mining and offshore. The balanced design has a very compact footprint for a given output. Output torque to 700,000 Nm (6,200,000 lbf.in). Units with output torque higher than 700,000 Nm (6,200,000 lbf.in) are available upon request.

Standard rotation 90° (+/-5°)

Totally enclosed weatherproof housing

Carbon steel construction

Electroless nickel-plated cylinders with redundant piston seals

Double acting with four hydraulic cylinders

Dual rack design

Female input shaft allows direct mounting to valve topworks