Product Introduction

This product is designed and manufactured by our professional technicians with reference to advanced counterparts from the US, France and domestic markets. It is suitable for industrial and mining enterprises, high-rise buildings, domestic water supply and fire protection systems. In scenarios requiring static and dynamic pressure reduction, it can replace intermediate water tanks, saving construction costs and expanding usable building space.

The valve body features a full-channel streamlined design, ensuring low fluid resistance and large flow. It adopts hydraulic operation: water pressure in the pipeline automatically drives the main valve disc to move up and down, controlling the valve port opening and regulating downstream pressure to maintain it at the value set by the pilot valve spring. When downstream pressure exceeds the set value, the pressure reducing valve shuts off automatically. It delivers stable outlet pressure (P2) regardless of fluctuations in inlet pressure (P1) or changes in downstream flow. Additionally, the pilot valve allows a wide outlet pressure adjustment range (10-80% of the inlet pressure), with stable operation and no water hammer.

200X Piston Type Pressure Reducing Valve Product Diagram

Working principle

The inlet pressure P1 enters the control chamber of the main valve through the conduit and needle valve 18 (see the structure diagram), establishing a downward pressure P3. The outlet pressure P2 also acts under the diaphragm (or piston) of the pilot valve via a conduit, opposing the regulating spring of the pilot valve. When the downstream pressure exceeds the set value of the pilot valve spring, the pilot valve closes, the water discharge from the control chamber becomes zero, the variable pressure P3 reaches its maximum, and the main valve disc is pressed tightly against the valve seat, closing the pressure reducing valve.

Once the downstream pressure P2 drops below the set value of the pilot valve spring, the pilot valve opens, and the pressure water in the control chamber is discharged downstream through pilot valve 9 and ball valve 6. Due to the small opening of the needle valve and the smaller diameter of the inlet conduit compared to the outlet conduit, the discharge rate exceeds the water replenishment rate of the inlet pressure. As a result, the pressure P3 in the control chamber decreases, and the inlet pressure P1, which acts under the main valve disc, lifts the main valve disc, thereby opening the pressure reducing valve.

In the stable regulation state, the discharge flow equals the replenishment flow, the opening of the main valve port remains unchanged, and the downstream pressure is stabilized. (This is the working principle of the diaphragm type, and the piston type works similarly.)