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. LPS actuators provide up to 550 kNm (405 659 ft-lb) of heavy-duty torque. Enhanced performance is achieved by using a superior Scotch yoke support design that significantly reduces transverse loads. LPS actuators feature modular construction to minimize repair time and initial cost while maximizing process availability.
Additional information
| Type | Scotch Yoke |
|---|---|
| Action | Rotary |
| Fluid Power | Pneumatic |
| Sizes | 15, 20, 25, 30, 35, 40, 50, 60 |
| Maximum Output | 550 000 Nm (405 659 ft-lb) |
| Pressure Rating | 174 psig |
| Fail Safe Operation | Last, Closed, Open |
| Enclosure | Nodular Ductile Cast Iron, 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 | Jackscrew Light, Enclosed Jackscrew, Beverl Gear, Hydraulic Manual Hand Pump |
| Options | Control Panel, Positioners, Limit Switch Box |
Features & Benefits
- The LPS 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
- 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)
- 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)
- 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 |
