The Limitorque LDG Direct Gas powered scotch yoke actuator series is specifically designed to be operated by high pressure natural gas, or any other high pressure pneumatic fluid up to a maximum of 105 barg (1500 psig). LDG actuators are ideal for pipeline applications where no external sources of motive power are present and provide a robust heavy duty design and long service life with industry leading maintenance intervals. This makes them the actuator of choice for installation in remote or unmanned facilities.
Additional information
| Type | Scotch Yoke |
|---|---|
| Action | Rotary |
| Fluid Power | Gas Powered |
| Sizes | 15, 20, 25, 30, 35, 40, 50 |
| Maximum Output | 300,000 Nm (221,268 ft-lbs) |
| Pressure Rating | 1500 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, Line-Break, Low/High Pressure Trips |
Features & Benefits
- The LDG actuator is suitable for use in Safety Integrated Systems in accordance with IEC 61508 up to and including SIL Level 3
- On-board Medium-High Pressure Control group MHPC provides multiple control functionalities at full rated pressure, thus eliminating need for pressure reducer, reducing system complexity, and limiting gas consumption and exhaust
- 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)
- 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 |
