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Scotch yoke pneumatic actuator

Short Description:

NORTECH Scotch yoke pneumatic actuator  are fit for turn-off or metering control of 90° valves (such as ball valves, butterfly valves and plug valves).

NORTECH scotch yoke actuators adopt modular design, including cylinder module, center body module and spring cartridge module.Modular components are replaceable and storable, which can meet the short supply cycle.
The all weather protection center body and yoke are made of ductile iron or cast steel. The yoke pin is made of alloy steel with excellent mechanical performance, and the adjustment bolts and fastening bolts of flange on both sides of the center body are of class 12.9 to ensure sufficient strength.
The inner wall of cylinder and the surface of piston rod are honed and plated with hard chromium,combined with the dynamic sealing design of star ring, the sealing performance is greatly improved.
Each of the NORTECH  series actuators can provide long and efficient work without maintenance.

NORTECH is one of the leading China Scotch yoke pneumatic actuator   Manufacturer & Supplier.

Product Detail

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What is Scotch yoke pneumatic actuator ?

Scotch yoke pneumatic actuator may be defined as a mechanical device that converts linear force into torque to motorise quarter-turn valves. A single-acting scotch yoke actuator is made of three main components: housing containing the yoke mechanism, pressure cylinder containing the piston and spring enclosure.

Main features of Scotch yoke pneumatic actuator

Pneumatic actuators generate operating energy through the efficient use of compressed air. The instrument air builds up force or pressure which applies against the diaphragm or piston. This then moves the valve actuator to position on the valve stem and the result is mechanical motion.
  • Compact design offers a high torque to weight ratio
  • Modular Design offers easy configuration in the field
  • Module alignment ensured by precision machined centering rings
  • Torque Output ranging from 2,744 to 885,100 in-lb (310 to 100,000 Nm)
  • Spring End Torque ranging from 2,744 to 445,261 in-lb (310 to 50,306 Nm)
  • Standard premium epoxy/polyurethane coating 


Technical specification of Scotch yoke pneumatic actuator

Operating Conditions

  • Pressure Range: 40 - 150 psi (2.8 - 10.3 bar)
  • Media: Dry Compressed Air/Inert Gas
  • Temperature Range Options:Torque Base: Mounting Dimensions per ISO 5211: 2001(E)
    • Standard: -20°F to 200°F (-29°C to 93°C)
    • High Temperature: Up to 300°F (149°C)
    • Low Temperature: Down to -50°F (-46°C)
  • Accessories: Shaft Driven Accessories Mounting per NAMUR-VDE
  • Performance Testing: EN 15714-3:2009
  • Ingress Protection: IP66/IP67M per IEC 60529
  • Safety: ATEX, SIL 3 suitable, PED on request

Product Show: Scotch yoke pneumatic actuator



Product Application: Scotch yoke pneumatic actuator

What is Scotch yoke pneumatic actuator used for ?

Scotch yoke pneumatic actuator  is available in symmetric design to meet application specific valve torque demand requirements with minimum cost and weight.

Scotch yoke pneumatic actuator are provided with modular design. A pneumatic or hydraulic cylinder can be attached to either or both sides. A spring cylinder can also fitted to either side for ESD (emergency shutdown) applications. With large stock or finished and semi-finished components always available, actuators can be assembled and supplied with very fast and reliable deliveries



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