Puhui 900X emergency shut-off valve

Function and purpose of 900X emergency shut-off valve

900x emergency shut-off valveIt is used in a water supply system that connects fire water and domestic water in residential areas. When using fire water, the valve automatically closes urgently, cutting off domestic water and ensuring sufficient fire water supply. When the fire is over, the valve automatically opens to restore the domestic water supply system. It can save costs more than traditional separate water supply for firefighting. The 900x emergency shut-off valve will cut off the domestic water supply to ensure sufficient fire water. When the fire pipeline stops using water and the pressure decreases, the valve will automatically open, in a normally open state, restoring the domestic water supply.

The main components of the 900x emergency shut-off valve and fire emergency shut-off valve include a main valve, needle valve, pilot valve, pressure gauge, and copper connecting pipe. It is a valve used for parallel distribution of fire water and domestic water in a water supply system. When the fire pipeline requires a large amount of water.

Working principle of emergency shut-off valve

When the inlet and outlet pressures of the main valve are lower than the set pressure of the pilot valve, the pilot valve is in an open state. At this time, the pressure in the valve chamber on the main valve is the same as the outlet pressure of the main valve, and there is a pressure difference between the inlet and outlet. Water flows out through the valve outlet. When the pressure of the fire pump starts or the variable frequency pump increases above the set pressure of the pilot valve, the main valve is controlled to increase the pressure through the copper pipe of the pilot valve, and the pressure on the spring increases. The valve core is pushed downwards, and the pilot valve is closed. The inlet pressure of the main valve is continuously supplemented to the upper valve chamber of the main valve through the throttle valve, and the pressure in the main valve chamber increases. The pushing disc is pushed downwards, and the interception port of the main valve is closed, and the main valve is closed.

The 900x emergency shut-off valve is a valve used for distributing water supply in parallel with firefighting water and domestic water in a water supply system. When the fire pipeline requires a large amount of water, timely closure of domestic water supply is achieved to ensure sufficient fire water supply. When the fire pipeline stops using water and the pressure drops, the valve automatically opens to restore the normally open state, achieving the restoration of domestic water supply. The pipeline design for installing and using this valve does not require separate pipelines for fire protection. Can save project costs. The valve control has high sensitivity, safety and reliability, easy debugging, and long service life. It is worth noting that when the inlet pressure is lower than the set pressure, the main valve is in the open state, and when the inlet pressure is greater than the set pressure, the main valve is in the closed state.

Emergency shut-off valve 900x main parameters

Specification caliber: 40 to 600mm;

Medium temperature: 0 to 80 degrees;

Applicable medium: clear water;

Connection form: flange;

Shell material: cast iron;

Flange standard: GB/T17241.6 GB/T9113; (Casting flange)

Test standards: GB/T13927, Ap1598.

900X emergency shut-off valve pressure rating: PN10, PN16, PN25;
Diaphragm type: DN20-450;
Piston type: DN350~700.

Typical installation of 900x emergency shut-off valve legend:

The following picture shows a typical installation pipeline design for a fire emergency shut-off valve. Firstly, let's talk about the design and installation of the main pipeline. A turbine butterfly valve and a Y-shaped filter are installed in front of the pump, and a 300X slow closing noise reducing check valve is installed behind the pump. The main pipeline is divided into two parts, one for domestic water and the other for fire water. This emergency shut-off valve is installed on the domestic water supply pipeline.