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.
Additional information
| 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 |
Features & Benefits
- 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
Case Studies
| Flowserve-Limitorque-Quad-Yoke-FPSO-Case-Study-FLS-VA-ECS-00006-EN-EX-A4-0217.pdf |
Flowserve-Limitorque-Quad-Yoke-FPSO-Case-Study-FLS-VA-ECS-00006-EN-EX-A4-0217.pdf |
