How to adjust the differential pressure setting value and proportion of pressure reducing valve? Talking about the principle of pilot pressure reducing valve. All books are value-driven.

The pilot pressure reducing valve is a pressure reducing valve which controls its action by its own pressure. It consists of a main valve, an auxiliary conduit, a decompression pilot valve, an angle needle valve, a ball valve and a pressure gauge.

The main valve of pilot pressure reducing valve is divided into control room \ upstream and downstream by I-shaped spool and diaphragm//valve seat respectively. Under the action of the spring, the conduit B discharges the upstream water to the downstream low pressure area of the confluence hole through the diversion hole.

The working process of the whole valve:

When the decompression pilot valve is fully opened, the water introduced into the hole-making chamber through the angle valve is completely discharged, and the main flow pushes the valve disc away from the valve seat. At this time, the main valve is in the supply state. When the decompression pilot valve reaches the set value and closes, the water entering the control room stays and forms upstream pressure to push the valve disc to the valve seat and compress it. At this time, the main valve is closed. When the opening (variable) of the decompression pilot valve is the same as the flow (quantitative) of the needle angle valve, the valve disc will automatically control its position.

To sum up, the pilot pressure reducing valve can use the upstream and downstream pressure difference as the power to make the diaphragm drive the valve core to move up and down under the target working pressure value, which is the same as the pressure reducing pilot valve (closed \ adjusted \ opened) to meet the pressure reducing requirements in the modern engineering fluid conveying system.

The above is the working principle and process of the pilot pressure reducing valve, and the value controlled by the fixed differential value proportional pressure reducing valve has been set at the factory, and its value can only change due to the change of working conditions (inlet pressure) and cannot be adjusted.

If in doubt, QQ6 19878393 will be happy to discuss the valve problem with you.