The KSB Group, a manufacturer of pumps and valves, has launched a new generation of pneumatic 90° quarter-turn actuators. The double-acting and single-acting pneumatic actuators of the ACTAIR EVO and DYNACTAIR EVO type series are designed for actuating different types of part-turn valves, like butterfly valves, ball valves and plug valves.

Applications covered by the actuators include water treatment, wastewater treatment, power generation, general industry, refinery engineering and shipbuilding.

Source: KSB Group

The double-piston actuators can be operated with compressed air to ISO 8573-1 from 3 to 8 bar. The maximum torque is 8,000 Nm for the double-acting type series and 4,000 Nm for the single-acting version. The maximum ambient temperatures should be between -50° C and 150° C. With their IP68 enclosure, the actuators are suitable for use in a maritime environment. This means that in the event of flooding they will remain water-tight for about 169 hours at a depth of up to 30 m.

For mounting the necessary control units, every actuator is designed with interfaces to the VDI/VDE 3845 standards. Connection to the valve is via an ISO mounting interface to ISO 5211. The scotch yoke mechanism of these pneumatic actuators provides a variable torque, with the peak torque being effective for closing the valve.

Further, the actuator is fitted with a position indicator and adjustable mechanical stops. The actuators are lubricated with silicone-free grease at the factory, and their gear housings are made of anodized aluminum alloy. The actuators can also be connected to higher-level process control systems with solenoid valves, positioners and diverse digital and analogue control units.