AC series

The AC series pneumatic actuators are suitable for driving and controlling various rotary valves. They are driven by compressed air at 2.5-8 Bar. The design requires no lubrication; the cylinder inner surface and piston rack are hardened, giving them a service life of over 1 million cycles.

The AC series pneumatic actuators are a perfect new generation of products integrating the latest technologies, practical materials, and precision processing technologies in the world. This series of pneumatic actuators features a double-piston rack and pinion structure. Double-acting and spring-return types share the same cylinder body and include a standard indicator and opening and closing adjustment devices. In addition, the latest design technology makes our products modern in appearance, beautiful in shape, and compact in structure.

Structure

1. Indicator

The multi-functional position indicator has a NAMUR standard mounting slot, allowing for easy installation of various accessories such as positioners and limit switches.

2. Output Shaft

The high-precision integral gear output shaft is made of nickel-plated alloy steel and conforms to ISO5211, DIN3337, and NAMUR standards. Dimensions can be customized according to user requirements, and stainless steel material is also available.

3. Cylinder Body

The ASTM6005 extruded aluminum cylinder body can be surface treated with hard anodizing, epoxy resin blue spraying, PTFE coating, or nickel plating, depending on the requirements.

4. End Cap

The die-cast aluminum alloy end cap can be treated with polyester coating, metal powder spraying, PTFE coating, or nickel plating.

5. Piston

The double piston rack uses hard-anodized cast aluminum or zinc-plated cast steel. The installation positions are symmetrical, the action is quick, the service life is long, and simply reversing the piston changes the rotation direction.

6. Stroke Adjustment

Two independent external stroke adjustment screws allow for convenient and accurate ±5° adjustment in both the opening and closing directions.

7. High-Performance Spring

The combined pre-loaded spring uses high-quality materials, coating treatment, and pre-pressure assembly. It has strong corrosion resistance and a long service life. Single-acting actuators can be safely and easily disassembled, and the output torque range can be adjusted by changing the number of springs.

8. Bearings and Guide Plates

Low-friction, long-life composite materials are used to avoid direct metal-to-metal contact, making maintenance simpler and more convenient.

9. Seal

O-rings use nitrile rubber at normal temperatures and fluororubber or silicone rubber at high or low temperatures.

Under normal operating conditions, the recommended safety factor for double-acting actuators is 15-20%, for example:

Valve Torque = 100 Nm

Safety Torque = 100 x (1 + 20%) = 120 Nm

Air Supply Pressure = 5 Bar

Referring to the double-acting actuator torque table, the smallest model for a double-acting actuator is: AC105DA (output torque of 164.4 Nm at 5 Bar).

Single-Acting Actuator Selection

Valve Required Torque = 80 Nm

Safety Torque = 80 x (1 + 30%) = 104 Nm

Air Supply Pressure = 5 Bar

Referring to the single-acting actuator torque table, we can find: AC140SRK7

Output Torque is

Air Stroke 0° = 318 Nm

Air Stroke 90° = 257 Nm

Spring Stroke 90° = 181 Nm

Spring Stroke 0° = 120 Nm

All output torques are greater than our requirements.

In the selection process of single-acting actuators, if we understand the torque distribution during the opening, operation, and closing of the valve, we can select the actuator more economically and reasonably.

For example:

Valve Required Torque = 80 Nm

Safety Torque = 80 x (1 + 30%) = 104 Nm

Valve opening requires torque = 104 x 30% = 32 Nm

Air Supply Pressure = 5 Bar

We can choose AC125SRK11

Air Stroke 0° = 141 Nm > 104 Nm

Air Stroke 90° = 83 Nm > 32 Nm

Spring Stroke 90° = 173 Nm > 32 Nm

Spring Stroke 0° = 115 Nm > 104 Nm

The above data shows that the normal opening and closing of the valve can be met.