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Process Design For Check Valves
- Apr 17, 2017 -

(1) The quality control of the main blank all parts of this valve are forgings, forged strictly in accordance with the forging process and process card, strictly control the temperature of the start forging, the end forging temperature, deformation degree and deformation speed, according to the cooling method stipulated by the process procedure. The chemical composition analysis, mechanical properties test, intergranular corrosion test and metallographic microstructure analysis were carried out to meet the corresponding standards.

The quality of the forgings is ensured by ultrasonic inspection and liquid penetration testing, in accordance with the RCC-M requirements for 100% ultrasonic flaw detection and evaluation of forgings, and the inspection and evaluation of all surfaces of forgings.

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

(3) Assembling test products not only need high-precision parts, but also how to assemble these high-precision components into high-performance products. The central nuclear-Soviet valve organizes an experienced, technically competent, composed of several technicians and senior technicians. Commissioning team, responsible for valve assembly, commissioning, testing, the development of parts of the cleaning process, assembly process, in the assembly and commissioning Strictly, excellence, to ensure that the valve assembly, commissioning success, and carried out various performance tests, the indicators are in line with the design task requirements.

(4) The process inspection of the valve produced a quality plan to ensure that the valve from raw materials, blank inputs, machining, welding, heat treatment, nondestructive testing, cleaning, assembly, factory test and all types of tests are quality control, and the nuclear Industry Second Research Institute recognized and live witness.