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.

Product diagram of 200X piston pressure reducing valve

Suitable for use in industrial and mining enterprises, high-rise buildings, domestic water, and fire water systems, it can replace intermediate water tanks in situations where static and dynamic pressure reduction is required, saving the cost of intermediate water tanks in buildings and expanding the space for building use. The valve body adopts a full channel streamline design, with low fluid resistance and high flow rate. Hydraulic operation is adopted in the transmission mode, which uses the water pressure in the pipeline to automatically operate the up and down movement of the main valve disc, control the valve opening, adjust the downstream pressure, and maintain the downstream pressure at the pressure value set by the pilot valve spring. When the downstream pressure exceeds the set value, the pressure reducing valve will automatically close, and regardless of the fluctuation of the inlet pressure P1, a stable outlet pressure P2 can be output. No matter how the downstream flow changes, the outlet pressure P2 can be maintained stable at the set value of the pilot valve. At the same time, the outlet pressure adjustment range regulated by the pilot valve is large, reaching 10-80% of the pre valve pressure, and it works smoothly without water hammer impact.

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.)

Structural diagram of 200X piston pressure reducing valve

The valve consists of a main valve, pilot valve, needle valve, ball valve, micro-filter, pressure gauge, etc. Since the pilot valve, needle valve, pressure gauge and other components are connected to the main valve via conduits, they are collectively referred to as the conduit control system. It can be divided into diaphragm type and piston type based on different pipe diameter requirements.

Main parts and materials

Main technical performance

Outline Dimension Drawing of 200X Piston Type Pressure Reducing Valve

Outline Dimension Table of 200X Piston Type Pressure Reducing Valve