(1) Quality control of main body blank All parts of the valve are forgings. Forging is carried out in strict accordance with the forging process procedure and procedure card, and the initial forging temperature, final forging temperature, deformation degree and deformation speed are strictly controlled. Cooling is carried out in accordance with the cooling method stipulated in the process procedure. The chemical composition analysis, mechanical properties test, intergranular corrosion test and metallographic structure analysis of the forged products were carried out. The results showed that all the products were in accordance with the corresponding standards.
The quality of forgings is guaranteed by ultrasonic inspection and liquid penetration inspection. The forgings are inspected and evaluated by 100% ultrasonic inspection and liquid penetration inspection and evaluation on all surfaces of forgings in accordance with RCC-M requirements.
(2) Welding In order to improve the surfacing quality, plasma argon arc welding technology is adopted for surfacing of valve disc and valve seat. At the same time, in order to ensure the welding quality, the welding process used in production was re-evaluated.
(3) Assembly test High-quality products not only need high-precision parts, but more importantly, how to assemble these high-precision parts into high-performance products. In nuclear Sue valve organized a team of experienced, very skillful, composed of a number of technicians and senior technicians assembly, commissioning team, responsible for the valve assembly, debug and test, make the cleaning technology of parts, assembly process, check on strictly in the assembly and debugging, strives for perfection, to ensure the success of the valve assembly, commissioning, and all kinds of performance test, All the indicators meet the requirements of the design task book.
(4) Process inspection of the valve quality plan, to ensure that the valve from raw materials, blank input, machining, welding, heat treatment, non-destructive testing, cleaning, assembly, factory test and various type tests have been quality control, and the second research and design institute of nuclear industry recognized and field witnessed.
Butterfly double flap check valve is suitable for high-rise building water supply pipe network, a certain chemical corrosive media pipe network, installation space is limited pipe network, but also suitable for sewage pipe network.
Lift type silent check valve is suitable for water supply and drainage engineering quality requirements of high pipe network; Pipe network with relatively high pressure requirements (PN2.5MPa); Can be installed at the outlet of the pump, is an economical and practical waterproof hammer check valve.
Lift type muffler check valve is suitable for water supply and drainage system, high-rise building pipe network, can be installed at the outlet of the pump, the structure is slightly changed, can be used as a suction bottom valve, but not for sewage pipe network.
Horizontal check valves are suitable for submersible, drainage, sewage pumps, especially for sewage and sludge systems.
Swing type rubber check valve is suitable for domestic water pipe network; But it is not suitable for sewage with much sediment
Swing single flap check valve is suitable for water supply system, petroleum, chemical, metallurgy and other industrial sectors to have the most suitable installation space limit places.