Pilot Film Steam Pressure Reducing Valve Pressure Regulator

When the pilot valve spring is in a free state before starting, the main valve and the pilot valve are in the closed state. The pilot valve is opened by spring force, the steam enters the main diaphragm chamber through the pilot valve, and part of the steam flows out through the control hole. When the steam flowing into the pilot valve is greater than the steam flowing out of the control hole, the control pressure in the main diaphragm valve increases and opens. main valve. As the steam flows through the main valve, the increase in downstream pressure is fed back through the sensing tube, and acts on the diaphragm of the pilot valve to balance the spring pressure on the upper part of the diaphragm, so that the pilot valve is closed and throttling, maintaining the pressure in the main diaphragm and controlling the main valve. The opening delivers just the right amount of steam. Downstream pressure can be varied by adjusting the spring on the pilot diaphragm.