Check valve process design

Check valve process design

(1) Quality control of the main body blank. All parts of this valve are forgings. During forging, they are strictly carried out in accordance with the forging process regulations and process cards. The initial forging temperature, final forging temperature, deformation degree and deformation speed are strictly controlled. According to the process regulations, cooling method. Chemical composition analysis, mechanical property test, intergranular corrosion test and metallographic structure analysis were carried out on the forged products. After analysis, testing and measurement, they all met the corresponding standards.

The quality of forgings is ensured through ultrasonic inspection and liquid penetrant inspection. In accordance with RCC-M requirements, 100% ultrasonic flaw detection and assessment of forgings are carried out, and liquid penetrant inspection and assessment are conducted on all surfaces of forgings.

(2) Welding In order to improve the quality of overlay welding, the plasma argon arc welding process is used for overlay welding on the sealing surfaces of the valve disc and valve seat. At the same time, in order to ensure welding quality, the welding process used in production was re-evaluated.

(3) Assembly test High-quality products not only require high-precision parts, but more importantly, how to assemble these high-precision parts into high-performance products. CNNC Su Valve organized an experienced and skilled assembly and debugging team composed of many technicians and senior technicians to be responsible for the assembly, debugging, and testing of valves. They also formulated the cleaning process and assembly process of parts. During assembly, Strictly check and strive for excellence during the valve assembly and debugging to ensure successful assembly and debugging of the valve. Various performance tests have been conducted, and all indicators are in compliance with the requirements of the design brief.

(4) Process inspection has prepared a quality plan for the valve to ensure that the valve is quality controlled and approved from raw materials, blank input, machining, welding, heat treatment, non-destructive testing, cleaning, assembly, factory testing and various type tests. Approved by the Second Industrial Research and Design Institute and witnessed on site.

Butterfly double-disc check valve is suitable for water supply pipe networks in high-rise buildings, pipe networks with certain chemically corrosive media, pipe networks with limited installation space, and sewage pipe networks.

The lift-type silent check valve is suitable for pipe networks with high quality requirements for water supply and drainage projects; pipe networks with relatively high pressure requirements (PN2.5Mpa); it can be installed at the outlet of the pump and is an economical and practical waterproof hammer check valve.

The lift type silencer check valve is suitable for water supply and drainage systems and high-rise building pipe networks. It can be installed at the outlet of the pump. With a slight structural modification, it can be used as a water suction bottom valve, but it is not suitable for sewage pipe networks.

Horizontal check valve is suitable for submersible, drainage and sewage pumps, especially for sewage and sludge systems.

Swing rubber check valve is suitable for domestic water pipe networks; but it is not suitable for sewage with a lot of sediments.

Swing single-disc check valve is suitable for water supply systems, petroleum, chemical industry, metallurgy and other industrial sectors. It is most suitable for places with limited installation space.