Process design of check valve

Design of check valve

(1) Quality control of the main body blank. All parts of this valve are forgings. The forging process is carried out in strict accordance with the forging process regulations and process cards, and the initial forging temperature, final forging temperature, deformation degree and deformation speed are strictly controlled. The cooling method performs cooling. Chemical composition analysis, mechanical property test, intergranular corrosion test, metallographic analysis of the forged product, after analysis, test and determination, all meet the corresponding standards.

The quality of forgings is guaranteed by ultrasonic inspection and liquid penetration inspection. Ultrasonic inspection and evaluation of forgings are carried out in accordance with RCC-M requirements, and liquid penetration inspections and evaluations are carried out on all surfaces of forgings.

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

(3) Assembling test products not only requires high-precision components, but also how to assemble these high-precision components into high-performance products. China Nuclear Su Valve has organized an assembly and commissioning team composed of a number of experienced and skilled technicians and technicians to be responsible for the assembly, commissioning and testing of the valve, and formulate the cleaning process and assembly process of the parts and components. Strictly check the assembly and commissioning, keep improving, to ensure the successful assembly and commissioning of the valve, and carry out various performance tests, and all indicators meet the requirements of the design task book.

(4) Process inspection has prepared a quality plan for the valve to ensure that the valve has been quality controlled and approved from raw materials, blank input, machining, welding, heat treatment, non-destructive testing, cleaning, assembly, factory testing, and various type tests. And on-site witness.