Self-reliance type flow working principle of the pneumatic control valve

Accused of medium after input self-reliance type pneumatic control valve, valve chamber film under pressure P1 input via the control line before, after the throttle valve throttle pressure Ps membrane house on input, P1 and Ps of delta Ps = P1 - namely Ps referred to as the effective pressure. P1 role in the effects of the thrust and Ps on the diaphragm on the diaphragm thrust produced by the poor and the spring force balance determine the relative position of the valve core and valve seat, flowing through the valve of the flow was established. When flowing through the valve of flow increase, the delta Ps increase, the results of P1, Ps, respectively, next, the film room, to make the valve core seat direction, which changes the circulation between valve core and valve seat area, increase the Ps, increase after Ps role on the diaphragm thrust and the spring force and P1 on the diaphragm thrust balance to achieve the purpose of flow control in a new location. On the other hand, in the same way. Self-reliance type pneumatic control valve is used to adjust in the field of industrial automation process control medium flow rate, pressure, temperature, liquid level, etc. The process parameters. According to the control signal of the automation system, the automatic pneumatic control valve opening, so as to realize the medium flow rate, pressure, temperature and liquid level of the regulation.