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Rotork linear actuators offer the advantages of compact size, high performance and a simple but highly reliable design. They are ideal for operating on/off and control functions of both globe and wedge gate valves. Both spring-return and double-acting configurations are available with either pneumatic or hydraulic cylinders.
Linear Actuators
Rotork Fluid Systems manufactures a comprehensive range of double-acting and spring-return pneumatic and hydraulic actuators to suit all valve sizes. These units are specifically sized for each application.
Operating Pressure: Pneumatic up to 12 Bar (175 psi), Hydraulic up to 250 Bar (3,625 psi)
Max. Thrust:
Pneumatic Double-Acting
1,800,000 N (404,656 lbs)
Pneumatic Spring-Return
400,000 N (89,925 lbs)
Hydraulic Double-Acting
5,500,000 N (1,236,450 lbs)
Hydraulic Spring-Return
400,000 N (89,925 lbs)
Temperature Ranges:
Standard: -30 to100°C/(-22 to 212 °F)
High: 20 to160 °C/(-4 to 320 °F)
Low: -40 to160 °C/(-40 to 320 °F)
Extreme Low: -60 to160 °C/(-76 to 320 °F)
Override Options
A dependable manual override facility is an important part of many valve/actuator applications. Rotork Fluid Systems has a variety of override options to meet virtually any requirement. Available options include handwheel jackscrew, hydraulic hand pump and gearbox solutions.
Key Design Features
- Carbon steel design single- and double-acting cylinders, electroless nickel-plated to reduce the surface roughness and to provide minimum friction and maximum protection against corrosion.
- Carbon steel piston with PTFE/rubber seals to reduce friction and avoid stick slip effect even after prolonged periods without operation.
- Carbon steel, chromium-plated piston rod to prevent corrosion and to minimise sliding friction on the dynamic seals.
- Visual position indicator directly connected to the valve stem showing actuator/valve full linear stroke.
- Totally enclosed carbon steel spring cartridge with additional safety feature to avoid injury during the disassembly of the spring enclosure.
- Carbon steel open type adaptor with bottom flange machined according to the valve flange.
- Actuators can be fitted with handwheel or hydraulic manual override on request.
Stem Coupling
Rotork's standard offering for linear actuators includes a carbon steel, nickel-plated coupling for mating the actuator piston rod to the valve stem. The coupling is supplied machined to suit the piston rod. The opposite end must be machined by others to suit the valve stem arrangement.
An optional coupling design is available upon request. It has added features to ease disassembly and to provide a 'hammer blow' effect that facilitates release of the valves.
Complete Control Solutions
Rotork has extensive experience in the design and assembly of all types of fluid power control systems to satisfy any customer requirement for on/off, modulating or ESD (emergency shut down) service. Packages can be mounted on a panel or in a cabinet and mounted either on the actuator or at a remote location. We offer components from all leading industry suppliers as well as those of our own design including limit switch housings, quick exhaust valves, pneumatic and hydraulic manifolds, shuttle valves, linebreak safety systems, a torque limiting device and partial stroke solutions.
Fire Protection Solutions
Rotork Fluid Systems' actuators and control systems can be customized to withstand exposure to both fire and vary high environmental temperatures. A range of fireproof systems are available that include flexible protective jackets, intumescent coatings and rigid enclosure systems. Each system offers unique features to meet a wide range of application requirements. The rigid enclosure system offers our maximum protection level of 1,200 °C (2,192 °F) for up to 120 minutes and can even be retrofit to existing actuator installations.
Extensive Product Range
Rotork Fluid Systems offers the world's most extensive line of fluid power valve actuators. Products include low- and high- pressure pneumatic, hydraulic and electro-hydraulic actuators. Scotch yoke, linear and rack and pinion designs are available in both double-acting and spring-return configurations. We also manufacture special build actuators for subsea and nuclear power applications and specialty products including a hydraulic damper for swing check valves, a manual/hydraulic power handwheel, and the SVM smart valve monitoring system; a comprehensive, non-intrusive valvetectuator partial stroke test and performance monitor.
