LHS & LHH

LHS & LHH

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.

Brand: Limitorque
Category: Scotch Yoke
Type Scotch Yoke
Action Rotary
Fluid Power Hydraulic
Sizes 15, 20, 25, 30, 35, 40, 50, 60
Maximum Output 300,000 Nm (221,268 ft-lbs)
Pressure Rating LHS: 3000 psig, LHH: 5000 psig
Fail Safe Operation Last, Closed, Open
Enclosure Fabricated Carbon Steel, Carbon Steel ENP Lined, Stainless Steel
Seals NBR Buna, Viton®, and Fluorosilicone
Temperature Range -60°C to 160°C (-76°F to 320°F) Seal Dependent
Manual Override Hydraulic Manual Hand Pump
Options Control Panel, Limit Switch Box

The LHS/LHH actuator is suitable for use in Safety Integrated Systems in accordance with IEC 61508 up to and including SIL Level 3

Efficient design based on computational modelling and extensive experimental validation provides high performance with reduced size, weight, and consumption

Quick stroking time: less than 0.5 seconds, subject to technical evaluation

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

Spring return and double acting configurations available (fail open, fail close, and fail-in-place capability)

High and Low temperature versions available: +160°C to -60°C (320°F to -76°F)

Wide range of feature and function customizations, including high-speed and high-cycle versions, are available