Power supply for small flow pneumatic cut-off ball valve The electro pneumatic valve positioner, powered by electric signal and compressed air, receives 0-10mA? Input from the control system? DC or 4-20mA? The DC current signal is converted from compressed air to air source pressure signal input and output by the regulator to change the rotation angle of the valve plate (0-90o any angle), which has better parameters such as flow regulation and control.
The external leakage of single seat pneumatic control valve can be solved by pressing the packing or replacing the packing. For the working conditions that must eliminate the leakage, the upper valve cover sealed by bellows can be used, which can basically solve the problem of external leakage. There are many reasons for the internal leakage of the valve, which are first described as follows:
