Self-reliance type pressure valve after pressure control principle of pneumatic control valve

Working medium of self-reliance type valve pressure P1 before after throttling after the valve core, valve seat, a valve after pressure P2. P2 input through the control line to the actuator in particular of the film under the indoor function of force and reacting force of spring balance, determines the position of the valve core and valve seat, valve after pressure. When the valve after pressure P2 increases, the P2 role in particular of force also will increase. In particular reaction force is greater than the spring, the valve core is close to the location of the seat, until a particular reaction and the reaction force of spring balance. At this time, the valve core and valve seat of the circulation area decreases, flow resistance, allowing the P2 to set value. Similarly, when the valve after pressure P2 falls, direction, contrary to the above, this is self-reliance type ( After the valve) The working principle of pneumatic pressure regulator.