3 Position Pneumatic Linear Actuator is an automatic control element driven by compressed air, which can achieve three stable mechanical positions.

feature

High positioning flexibility
The 3-Position Pneumatic Linear Actuator can accurately achieve three fixed action positions by configuring an auxiliary limit piston system. The intermediate position angle supports adjustment within the range of 20° to 175°, and the adjustment error is controlled within ±1°, which meets high-precision scenarios such as segmented action and buffer control.

Strong compact structure
The 3-Position Pneumatic Linear Actuator adopts an integrated aluminum alloy cylinder structure to integrate the three-position action function in a compact space. Compared with traditional three-point actuators, its structural length is reduced by about 20%, which effectively improves the overall layout flexibility of the equipment.

Fast response speed
Relying on the optimized air path design and efficient dual piston structure, the 3-Position Pneumatic Linear Actuator achieves a fast switching response of 0.1 to 0.3 seconds per time, which is suitable for automation processes with short cycle times and frequent actions.

Long service life
The seals of the 3 Position Pneumatic Linear Actuator are made of highly wear-resistant nitrile rubber (NBR), and combined with a hard anodized cylinder body, the service life can reach more than 10 million times under the normal air source pressure of 6~8 bar.

Diverse control methods
Through the matching three-position five-way solenoid valve and signal switching system, the 3 Position Pneumatic Linear Actuator can achieve remote centralized control, support three-stage action modes of fully closed, neutral, and fully open, and cooperate with the PLC system operation, the control is more intelligent, meeting the needs of multi-station process switching.

Working principle

Pneumatic actuator has two kinds of models: 0°-45°-90° and 0°-90°-180°. The air intake "2" after the intake ends of the piston movement was designed to both ends there are auxiliary pistons produce mechanical constraints to achieve a middle positon, can be used directly out of both ends of the adjusting screw is easy to adjust the middle point of view, such as 20°, 30°, 50°, 75°, and 95°, 120°, 130°, 150°, 175° and so on.

Three-position pneumatic actuator operation requires the design of a solenoid valve control loop system to complete the operation. The control principle is as follows:

Position 1 (middle)

In this position, air pressure is applied simultaneously to ports 2 and D. Air is exhausted from ports 4 and C. The internal piston is positioned with restrictions from the secondary piston at port D, which ensures the piston remains in the middle position.

Position 2 (open position)

When air pressure is applied simultaneously to ports 2 and C, and air is exhausted from ports 4 and D, the internal piston moves. The auxiliary port C helps lift the restrictions on the piston, allowing it to smoothly reach the fully open position.

Position 3 (fully closed position)

In this position, air is directed into port 4, while air is discharged from port 2. The internal piston moves toward the middle position, ensuring a fully closed position. The actuator includes a 0°-45°-90° spring-return specification, meaning that if there is a loss of power or gas source failure, the internal piston will return to the fully closed position by spring force.