Self-acting pressure control valve

The pressure of the working medium before the valve, P1, becomes the pressure after the valve, P2, after passing through the throttle formed by the valve core and the valve seat. P2 is delivered through control lines to the lower diaphragm chamber of the actuator, acting on the top plate; the force generated thereby balances the reaction force of the spring, determining the relative position of the valve core and the valve seat and thus controlling the pressure behind the valve. As the pressure behind the valve, P2, increases, the force exerted by P2 on the top plate also increases in a self-acting pressure control valve. At this point, the force exerted by the top plate is greater than the reaction force of the spring, causing the valve core to move toward the valve seat until the force from the top plate and the reaction force of the spring are in balance. At this point, the flow area between the valve core and the valve seat decreases, the flow resistance increases, thereby reducing P2 to the set value. Similarly, when the pressure P2 behind the valve decreases, the direction of action is opposite to that described above; this is the working principle of a self-acting (pressure behind the valve) pressure control valve.

This post was last edited by urayte on 2011-12-15 09:33. Self-acting control valves utilize feedback signals from the valve’s output side (pressure, pressure difference, temperature), which are transmitted via signal tubes to the actuator in order to drive the valve disc and adjust the degree of opening of the valve, thereby achieving regulation of pressure, flow rate, and temperature. We supply originally imported steam pressure regulators, pressure regulators for water and air, differential pressure control valves, and various other self-acting pressure control devices. If you need them, please visit http://www.ou-ray.com

Self-acting pressure control valves are divided into three series: self-acting pressure, differential pressure, and flow control valves. Self-acting pressure control valves are classified into pre-valve and post-valve types depending on the location of the pressure sampling point; when the sampling point is located before the valve, it is used to maintain a constant pressure before the valve ； When the pressure measurement point is located behind the valve, it is used to maintain a constant pressure behind the valve. When the pressures before and after the valve are applied to both sides of the actuator’s chamber simultaneously, a self-acting differential pressure control valve can maintain a constant pressure across the valve. The differential pressure between the two ends of a orifice plate installed in a pipeline can also be applied to both sides of the diaphragm actuator’s chamber to create a self-acting flow control valve; alternatively, flow can be detected and then regulated using a self-acting differential pressure control valve.

I’ve learned it.* There is quite a lot to know about pumps; I’ve encountered many problems in the field