How does sybv model of pneumatic lever butterfly valve connect with plc? 3、 Electric relay The electric relay is a kind of power amplifier, which can send the air pressure signal to a far place to eliminate the lag caused by the extension of the signal pipeline. It is mainly used between the field transmitter and the regulating instrument in the central control room, or between the regulator and the on-site butterfly valve. Another function is to amplify or reduce the signal.
、 Structural characteristics and working principle:
1. The biggest difference between the flange three eccentric multi-level hard seal butterfly valve and other butterfly valves is that the three eccentric design structure is adopted. The installation center and rotation center of the butterfly plate are designed with strict eccentricity. When the valve is opened at 10 ℃ or even fully opened, the sealing surface of the valve seat and the butterfly plate of the butterfly valve are in a non-contact state. When the valve is closed, the butterfly plate rotates with the valve stem and deflects into the sealing surface of the valve seat to make it closed. Therefore, the service life of the valve is prolonged due to less and no wear during the opening and closing process.
2. The valve seat of Shanghai Guilong butterfly valve uses an embedded O-ring or fluoroplastic as the sealing gasket to form a seal. Therefore, it has the function of self compensation for temperature difference and wear to ensure the tightness of Guilong butterfly valve.
3. When the butterfly valve pipeline fluid pressure is transmitted into the valve seat sealing groove, because of the Posson "s component action principle, the resultant force generated by the sealing element and the O-ring expansion force when the pipeline pressure is applied will squeeze the sealing surface of the valve seat towards the butterfly plate to seal the valve. This unique sealing structure can generate greater sealing force with the increase of pipeline pressure.
4. The valve seat of butterfly valve can be slightly adjusted. After the valve has been used for a certain period of time, when the seal ring is worn by itself and leaks, the adjusting screw can fine tune the seal pressure ring to the required size in the direction of the butterfly plate without dismantling the valve, so that it can be compensated and have the same sealing performance as the new valve.
5. In addition to manual devices, the flange three eccentric multi-level hard sealing butterfly valve series can also be equipped with electric devices or electric devices to form three categories of six series products, including manual butterfly valves, pneumatic butterfly valves (feedback signals can be attached and electric pneumatic valve positioners can be added) and pneumatic butterfly valves.
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