Limitorque LPS Pneumatic Scotch Yoke Actuator

Limitorque’s LPS heavy-duty pneumatic scotch yoke actuator is the innovative, reliable choice for on/off, inching, and modulating automation applications on quarter-turn medium-to-large sized valves in general and protective services for the oil & gas market.

ISO 9001 and 5211
EN 15714, 60529, 13906, 13445 and 12570
IEC 61508 SC3
ATEX 2014/34/EU

Torque Rating Range: Up to 300000 Nm (221 270 ft-lb)

Pressure Rating:
Operating Pressure: 2.5 to 12 barg (36.3 to 174 psig)
MAWP = 12 barg (174 psig)
IP 66/67 and IP 66M/67M
NBR Buna, Viton®, and fluorosilicone sealing


  • Efficient design based on computational modeling and extensive experimental validation provides high performance with reduced size, weight, and consumption
  • Symmetrical and canted scotch yoke types perfectly fit individual valve torque requirements
  • Rugged heavy-duty fabricated carbon steel build epoxy painted and Electroless Nickel Plated (ENP) cylinders provide maximum protection against corrosion
  • Dust/waterproofing to IP66/IP66M and IP67/IP67M according to EN 60529
  • 25-year design life and maintenance intervals of up to six years, (depending on service conditions, proper installation, operation, and maintenance) exceed industry expectations
  • Modular construction allows easy on-site maintenance without special tools and without removal from the valve


  • Symmetric and canted scotch yoke mechanisms as standard. Customized yoke profiles available as an option
  • Spring return and double-acting configurations available (fail open, fail close, and fail-in-place capability)
  • Jackscrew, Geared, and Hydraulic Manual Operators are available on request. (Availability will vary based on size)
  • High and Low-temperature versions available: +160°C to -60°C (320°F to -76°F)
  • PED 2014/68/EU and & ASME BPVC VIII div. 1 versions available
  • Standard or special painting upon request
  • A wide range of feature and function customizations, including high-speed and high-cycle versions, are available

Specs & Brochures