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Flowserve-Limitorque-Hydraulic Actuators - LHS & LHH

Hydraulic Actuators - LHS & LHH

BRAND: Limitorque

The Limitorque LHS and LHH Hydraulic Scotch Yoke actuator series are designed to meet or exceed the most current and stringent safety and reliability standards for application in the oil and gas industry. LHS and LHH are ideal where hydraulic motive power is preferred for the operation of quarter-turn valves and for applications requiring a robust heavy duty design, long service life, high-torque and high-speed operation.


  • General Industry
  • Chemicals
  • Oil & Gas
  • Power

industry sectors

  • Mining
  • Basic (Organic & Inorganic)
  • Specialty (Fine & Consumer)
  • Biofuels
  • Upstream Exploration & Production
  • Midstream Transportation
  • Downstream Processing
  • Conventional Steam
  • Geothermal
  • Combined Cycle
  • ISO 9001 and 5211
  • EN 15714, 60529, 13906, 13445 and 12570
  • IEC 61508 SC3
  • ATEX 2014/34/EU
Design Range

Torque Rating Range: Up to 300000 Nm (221000 ft-lbs)

Pressure Rating:

  • LHS series: 207 barg (3000 psig) MAWP
  • LHH series: 345 barg (5000 psig) MAWP
Environmental Enclosures
  • IP 66/67 and IP 66M/67M
  • ATEX Ex II 2GD
  • NBR Buna, Viton®, and Fluorosilicone sealing
Features & Benefits
  • Efficient design based on computational modelling 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
  • Quick stroking time: less than 0.5 seconds, subject to technical evaluation
  • 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

Hydraulic actuator rated 207 barg (3000 psig) Maximum Allowable Working Pressure (MAWP)

Hydraulic actuator rated 345 barg (5000 psig) Maximum Allowable Working Pressure (MAWP). 410 barg (6000 psig) versions also available on request.

  • Symmetric and canted scotch yoke mechanisms as standard. Customized yoke profiles available as option
  • Spring return and double acting configurations (fail open, fail close and fail-in-place capability)
  • Hydraulic Handpump for Manual Operation available on request
  • 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 customer specified painting on request
  • Wide range of feature and function customizations, including high-speed and high-cycle versions, are available

Flowserve Limitorque offers practical product training at our global automation headquarters in Lynchburg, Va., and our state-of-the-art valve automation center in Houston. Taught by qualified instructors in classroom settings, these three-day courses emphasize hands-on training. Key topics include the principles of actuator functionality as well as actuator setup and commissioning, maintenance and troubleshooting. View available courses and dates.


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