Features and benefits of swing check valve with pneumatic actuator 

• *Trouble-free operation and easy maitanance
• *Prevent medium back flow and eliminate destructive water hammer when the valve close. Protect the pipe system.
• *Fitted with cushion cylinder and lever weight, connected with disc by same shaft. The open and close time or speed can be adjusted by regulating valve and slide weight.      
• *Sealing performance stable, reliable and wear resistance. Long use life, No vibration, No noise.

Working principal of swing check valve with pneumatic actuator :

• 1. When the upstream water pressure higher than the valve open pressure, the valve disc will be pressed open. The cylinder piston will be drive open and inhale. When the upstream water pressure stop or back pressure, the valve disc will be close quickly by the disc deadweight, lever weight and back pressure. The cylinder piston fall down and the air inside the cylinder will start to produce damping force. More closing to the valve seat, more damping force it happened. When the disc closing to 30% open position, the damping force will be significantly increased. The disc will start to close slowly.
• 2. The closing speed of the disc can be adjusted by the regulating valve on the cylinder. Turn the knob of the regulating valve clockwise will increase the damping force of the cylinder and slow down the close speed of the disc; turn the knob of the regulating valve of the cylinder anti-clockwise will speed up the close of the disc. The lock nut clockwise adjustment after the completion of the can lock position at this time.