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Specs & Brochures



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/water proofing to IP66/IP66M and IP67/IP67M according to EN 60529
25-year design life and maintenance intervals 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 option
Spring return and double acting configurations available (fail open, fail close and fail-in-place capability)
Jackscrew, Geared and Hydraulic Manual Operators 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
Wide range of feature and function customizations, including high-speed and high-cycle versions, are available

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