D647H / X -2.5 pneumatic double eccentric butterfly valve with pneumatic actuator device mechanically driven by the completion of the disc opening and closing action. The valve has a closing torque, good sealing performance, long life and other characteristics. Open and close the valve disc position limit switch signals can be displayed through. The valve can be a single remote control, you can focus on more than one remote control, but also signals can be input into the computer program control. Under normal circumstances, the non-manual operation can be performed on-site.