200X pressure reducing valve

One. Structure and characteristics

The 200X pressure reducing valve is a valve used to adjust the direction of water supply in a water supply system that connects fire water and domestic water in parallel. When a fire occurs, a large amount of water is needed for firefighting, immediately cut off the domestic water to ensure sufficient firefighting water; when the pressure of the fire stop water is reduced, the valve will automatically open and be in a normally open state to restore the domestic water supply. This valve eliminates the need to set up a separate fire-fighting separate water supply pipe network for the system, which greatly saves construction costs and water consumption. The valve control has high sensitivity, safety and reliability, easy debugging and long service life.

Two. Selection points

1. The hydraulic control valve used in the engineering type is a product that has passed the inspection of the manufacturer, has a complete variety of signs, and the technical data meets the requirements.

2. According to the functional requirements, select the type of valve, and then determine the material of the valve body and sealing part according to the pipeline transportation medium, temperature, construction standards and requirements of the owner. Commonly used valve body materials are cast iron, copper iron, copper, plastics and so on. Commonly used sealing surface and lining materials are copper alloy, plastic, steel, cemented carbide, rubber, etc. The valve body material should match the pipe material.

3. The nominal pressure of the valve has different levels such as 0.6, 1.0, 1.6, 2.5 and 4.0MPa. The working pressure of the medium transported by the pipeline should be less than the nominal pressure value of the valve.

4. The installation of hydraulic control valves in the project should have enough space for management, operation, installation and maintenance, and should meet the requirements of pipelines for valves.

5. When the pipeline adopts flange connection, the flange connection hydraulic control valve should be adopted; when the pipeline adopts the groove connection, the groove connection hydraulic control valve should be adopted.

6. The hydraulic control valve should be installed on the pipeline where the medium flows in one direction.

7. The direction of the arrow on the main valve body of the hydraulic control valve must be consistent with the flow direction of the pipeline system.

8. There should be no air blockage or air resistance in the pipe section of the hydraulic control valve. Automatic exhaust valves should be installed in the gas storage section such as the highest position of the pipe network.

9. When the valve is installed horizontally, the valve cover and valve stem should face upwards. When installed vertically, the valve cover and valve stem should face outwards.

10. The strength and tightness test should be done before the valve is installed.

11. The strength and tightness test of the valve should meet the following requirements.

A. The strength test pressure of the valve is 1.5 times the nominal pressure;

B. The tightness test pressure of the valve is 1.5 times the nominal pressure;

C. The test pressure should remain unchanged for the duration of the test, and there should be no leakage of the shell packing and the sealing surface of the valve clack;

D. The valve test duration is as per the above table.

Three, technical parameters