Process design：

(1) The main body blank quality control of all parts of the valve are forgings, forging in strict accordance with the forging process rules and process card, strict control of the beginning of forging temperature, final forging temperature, deformation degree and deformation speed, according to the process rules cooling method. The chemical composition analysis, mechanical properties test, intergranular corrosion test and metallographic structure analysis were carried out on the finished products.

The quality of forgings is guaranteed by ultrasonic inspection and liquid penetration inspection, 100% ultrasonic inspection and evaluation of forgings are carried out according to RCC-M requirements, and liquid penetration inspection and evaluation are carried out on all surfaces of forgings.

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

(3) Assembly test high-quality products not only need high-precision parts, but also 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 specification.

(4) The process inspection of the valve quality plan, to ensure that the valve from raw materials, blank input, machining, welding, heat treatment, nondestructive testing, cleaning, assembly, delivery test and each type test are quality control, and the second research and design Institute of nuclear industry recognized and on-site witness.

Butterfly DOUBLE VALVE IS SUITABLE FOR HIGH-RISE BUILDING WATER SUPPLY NETWORK, there are certain chemical corrosive medium network, installation space limited network, also suitable for sewage network.

Lift type silent check valve is suitable for water supply and drainage engineering pipe network with high quality requirements; Pipe network with relatively high pressure requirement (PN2.5Mpa); Can be installed at the pump outlet, is an economical and practical waterproof hammer check valve.

Lifting TYPE MUFFLER CHECK VALVE IS SUITABLE FOR WATER SUPPLY AND DRAINAGE SYSTEM, high-rise BUILDING PIPE network, can be installed at the pump outlet, the structure is slightly changed, can be used as a suction bottom valve, but not for sewage network.

Horizontal CHECK VALVES ARE SUITABLE FOR submerSIBLE, DRAINAGE and sewerAGE PUMPS, ESPECIALLY FOR SEWAGE and SLUDGE SYSTEMS.

Swing rubber check valve is suitable for domestic water pipe network; But it is not suitable for sewage with many sediments

Swing SINGLE DISC CHECK VALVE IS SUITABLE FOR WATER SUPPLY SYSTEM, petroleum, chemical, metallurgical and other industrial sectors for the installation of space constraints.

Fault handling：

The disc break

The cause of disc breakage is

The prevention method is to use the disc as a ductile material check valve.

Medium backflow

There are several reasons why the medium flows backwards

① sealing surface damage; ② Clamp in impurities.

By repairing the sealing surface and cleaning impurities, backflow can be prevented.

check valve