New Generation of Pneumatic Quarter-Turn Actuators

Actuators New Generation of Pneumatic Quarter-Turn Actuators

23.08.2023 Source: Press release KSB Reading Time: 1 min

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KSB has recently introduced its 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 which can be used in all types of part-turn valves.

The double-acting and single-acting pneumatic actuators of the Actair Evo and Dynactair Evo type series are designed for actuating all types of part-turn valves.
(Source: KSB)

In the first half of 2023, the KSB Group 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 all types of part-turn valves, such as butterfly valves, ball valves and plug valves. Applications covered by the actuators are water treatment, waste water treatment, power generation, general industry, refinery engineering and shipbuilding.

The double-piston actuators can be operated with compressed air to ISO 8573-1 from 3 to 8 bar. The maximum torque is 8000 Nm for the double-acting type series and 4000 Nm for the single-acting variant. The maximum ambient temperatures should be between -50 °C and +150 °C, shares the company. 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 metres.

The pneumatic connections comply with the Namur requirements. 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, adds the firm.

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

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