Working principle of self operated flow regulating valve
Release time:
2023-05-29
After the controlled medium is input into the valve, the pressure P1 in front of the valve is input into the lower membrane chamber through the control pipeline, and the pressure Ps after being throttled by the throttle valve are input into the upper membrane chamber.
After the controlled medium is input into the valve, the pressure P1 in front of the valve is input into the lower membrane chamber through the control pipeline, and the pressure Ps after being throttled by the throttle valve are input into the upper membrane chamber. The difference between P1 and Ps, 4Ps=P1-Ps, is called the effective pressure. The balance between the thrust generated by P1 acting on the diaphragm and the thrust difference generated by Ps acting on the diaphragm and the spring reaction force determines the relative position of the valve core and the valve seat, thus determining the meteor flowing through the valve. When the number of meteors flowing through the valve increases, that is, Δ Ps increases. As a result, P1 and Ps act on the lower and upper membrane chambers respectively, causing the valve core to move towards the valve seat, thereby changing the flow area between the valve core and the valve seat, causing Ps to increase. The increased Ps act on the diaphragm with a balance between the spring reaction force and the thrust of P1 acting on the diaphragm at the new position to achieve flow control. On the contrary, the same applies. Self operated regulating valves are used to regulate process parameters such as medium flow, pressure, temperature, and liquid level in the field of industrial automation process control. According to the control signals in the automation system, the opening of the valve is automatically adjusted to achieve the adjustment of medium flow, pressure, temperature, and liquid level.
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