A single-acting pneumatic actuator is a type of actuator that operates in only one direction using compressed air. In the opposite direction, return is achieved through a spring system. This setup allows for a safe closure without the need for electricity.

This type of actuator is particularly notable for its ability to keep the system in a closed position during power outages. Its spring-return design provides simple, reliable, and cost-effective solutions.

Compared to double-acting pneumatic actuators, single-acting actuators operate with less energy. This makes them a preferred choice in energy-saving systems.

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Where to use?

Single-acting pneumatic actuators are used in many industries where a safe shut-off is required. They are particularly preferred in chemical processes, steam lines, and gas distribution systems.

They are used for safe valve control in power plants, water treatment facilities, and petrochemical plants. In addition, they are also employed in HVAC systems and fire-fighting pipelines.

Since air is required in only one direction, the system installation is easier and more economical. This reduces both installation time and cost.

Its ability to operate reliably in harsh environments and provide automatic closure thanks to the spring is a significant advantage. Among UNOX pneumatic actuator models, single-acting options are available in a wide range.

Technical Structure and Features

UNOX single-acting pneumatic actuators feature an aluminum extrusion body. The internal surfaces are treated with friction-reducing techniques, providing high efficiency and long service life.

The pistons are made of aluminum casting, while the springs are made of high-elasticity steel. The cadmium-plated shaft increases corrosion resistance and extends the system’s lifespan.

Nitrile rubber seals are used for leak prevention, ensuring safe operation under all conditions. All mounting dimensions comply with ISO 5211 and VDI/VDE 3845 standards.

In addition, the actuators can be easily integrated with accessories such as switch boxes, directional valves, and solenoid valves.

Why Should It Be Preferred?

In applications requiring safe shut-off, single-acting actuators provide a significant advantage. During power outages, the system closes automatically, reducing risks.

These systems stand out for their low energy consumption and high safety standards. In addition, they require minimal maintenance and can operate reliably for many years.

With UNOX-branded locally manufactured actuators, both quality and cost advantages can be achieved. Models are offered in a variety that is compatible with different types of valves.