DFA

DFA

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.

Brand: Vahn-Tech
Category: Scotch Yoke
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

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