The DFS series scotch and Yoke Pneumatic Actuators are heavy-duty actuators for operating large diameter ball valves, butterfly valves, plug valves and other 90˚ rotating mechanism. Available with two yoke deigns namely symmetrical design and canted yoke design. Cylinder blocks are plated with hard chromium to increase the service life of the actuators. The piston rod and guide block connection superior surface finish and the self-lubricating bearings maximize the input energy transfer directly to the valve stem and ensure reliable operation over the service life of the actuator. Can be supplied with the complete line of controls and monitoring accessories, including hand wheel, hydraulic manual override, limit switches, solenoid valves, positioners and other control accessories.
Additional information
| Type | Scotch Yoke |
|---|---|
| Action | Rotary |
| Fluid Power | Pneumatic |
| Sizes | 250, 300, 350, 400, 450, 500, 550, 600, 700 |
| Maximum Output | 29 000 Nm (21 390 ft-lb) |
| Pressure Rating | 100 psig |
| Fail Safe Operation | Last, Closed, Open |
| Enclosure | Carbon Steel |
| Seals | NBR Buna, FKM, and Fluorosilicone |
| Temperature Range | -40°C to 150°C (-40°F to 302°F) Seal Dependent |
| Manual Override | Jack Screw Handwheel, Hydraulic Manual |
| Options | Control Panel, Positioners, Limit Switch Box |
Features & Benefits
- VT-DFA series Scotch and Yoke Pneumatic Actuators are heavy-duty actuators for operating large diameter ball valves, butterfly valves, plug valves and other 90° rotating mechanisms
- The piston rod and guide block connection, superior surface finish and the self-lubricating bearings maximize the input energy transfer directly to the valve stem and ensure reliable operation over the service life of the actuator
- Efficiency is further enhanced by the tension-loaded spring, minimizing radial loads on the piston road
- VT-DFA series actuators incorporate three stages of internal and external coatings to resist severe weather, chemical and petroleum environment
- The inner surface of cylinder is coated by PTFE, that provides enhanced corrosion resistance and is self-lubricating
- VT-DFA series actuators can be supplied with the complete line of controls and monitoring accessories, including handwheel, hydraulic manual override, limit switches, solenoid valves, positioners and other control accessories
- The modular design of the Scotch & Yoke makes it suitable for all type of application. It is extremely convenient and easy to handle during storage, installation and maintenance operation
- Modules are removable, serviceable and interchangeable when mounted on the valve
- To ensure the safety of personnel during installation and maintenance, the spring module has been designed so that it only be removed from the power module with the spring in the fully extended position
- This prevents accidental release of the spring force, protecting personnel from injury and the actuator from accidental damage
