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Air Operated Butterfly Valve Working Principle

17 views Source: VALTEC China Valve Manufacture CO.,LTD

Air operated butterfly valve is a combination of a pneumatic actuator and butterfly valve, pneumatic butterfly valve because the butterfly valve is installed in the pneumatic actuator, solenoid valve coil, air filtration pressure reducing valve, signal feedback device, so that it can adapt to some high-risk working conditions, reduce the human operation may bring the danger, especially in the low pressure large and medium diameter pipeline, the use of pneumatic butterfly valve more and more, the price is also more favorable.

Air Operated Butterfly Valve img
Air Operated Butterfly Valve

Air operated butterfly valve working principle

The pneumatic butterfly valve is equipped with a pneumatic actuator to replace the human operation. Its working principle is to use compressed air as the power source to drive the valve stem to rotate, and the stem drives the disc-shaped butterfly plate to rotate, and the initial position of the butterfly plate depends on the actual demand.

Single acting air operated butterfly valve working principle

Single acting air operated butterfly valve single effect positioner output gas signal pressure input to the pneumatic actuator without taut spring side of the gas chamber, because the gas signal pressure effect on the piston in the case of the difference between the thrust and taut spring force, the cylinder piston will do linear motion. The motion is stopped when the thrust force of the pneumatic signal pressure is balanced with the spring force by the gear and rack drive.

And, in the actuator spindle for rotary motion at the same time drive the valve stem, spool for rotary motion, and then change the flow area between the spool, valve seat, to reach the regulating intention.

principle of single acting actuator counter clockwise

Air to port A forces the pistons outwards, causing the springs to compress, The pinion turns counterclockwise while air is being exhausted from port B.

Loss of air pressure on port A, the stored energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from port A.

principle of single acting actuator clockwise

Air to port B forces the pistons outwards, causing the springs to compress, The pinion turns counterclockwise while air is being exhausted from prot B.

Loss of air pressure on port A, the stored energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from prot A.

Double acting air operated butterfly valve working principle

Double acting air operated butterfly valve has two air chambers on the left and right, and the air source signal pressure output by the double effect positioner is input into the left and right air chambers of the actuator piston respectively. Because the pressure of the gas source input to the two chambers is different, the pressure difference will be formed between the two chambers, and then the piston will be pushed for linear motion. Through gear and rack drive, the linear motion of piston is converted into rotary motion of actuator spindle, and the motion will stop when the pressure of left and right chambers are balanced. If it is necessary to adjust the flow, it is necessary to drive the valve stem and spool to do rotational motion while the actuator does rotational motion, in order to change the flow area between the spool and the valve seat to reach the adjustment intention.

principle of double acting actuator counter clockwise

Air to Port A forces the pistons outwards, causing the pinion to turn counterclockwise while the air is being exhausted from Port B.

Air to Port B forces the pistons inwards, causing the pinion to turn clockwise while the air is being exhausted from Port A.

principle of double acting actuator counter.

Air to Port A forces the pistons outwards, causing the pinion to turn clockwise while the air is being exhausted from Port B.

Air to Port B forces the pistons inwards, causing the pinion to turn counterclockwise while the air is being exhausted from Port A.

Pneumatic butterfly valve is a kind of general valve which is used especially widely. Nowadays, many chemical industries, paper industry, coal industry, petroleum, medical and so on will use the valve, especially the pneumatic valve, VALTECCN is a Chinese butterfly valve supplier and manufacturer, if you need to buy pneumatic butterfly valve, feel free to contact us.

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