Machining process of valve body of large-flow cartridge valve

Abstract

The invention provides a machining process of a valve body of a large-flow cartridge valve. The machining process comprises the following operation steps of workblank molding, wherein carbon structural steel is adopted as materials of the valve body of the valve, a workblank is molded into a large-diameter thick-wall seamless steel pipe, and high-temperature forging is adopted in a molding method; workblank machining, wherein the thick-wall seamless steel pipe of a proper specification is selected according to the appearance and the size of the valve body of the valve and cut into segments; and valve body machining, wherein machining of a main pressure distribution valve body, machining of an isolating valve body and machining of an accident pressure distribution valve body are included. Workblank molding is easy, no casting mold needs to be independently designed for various valves, and the workblank purchasement cost is lowered to a large degree. The workblank machining amount is reduced, and the material waste rate is lowered. The machining amount is reduced, machining time is shortened, the machining cost is reduced, and the shipment period is shortened. The defects of holes, cracks, disqualification of components, structures and performance and the like possibly caused in the casting process are overcome, the product strength is guaranteed, and the shipment yield is improved. The machining process is suitable for large-batch production, and is wider in application range than a traditional machining process.

Description

technical field [0001] The invention relates to a processing technology for a valve body of a cartridge valve, in particular to a processing technology for a valve body of a large-flow cartridge valve used in a speed regulating system of a water turbine. Background technique [0002] At present, the valve parts used in the speed control system of large-scale hydraulic turbines at home and abroad, such as the main pressure distribution valve, emergency pressure distribution valve and isolation valve, etc., are all large in size, and their valve bodies are mostly cast or processed from large steel blocks. For casting, its molding process is cumbersome, the cost is high, and the casting itself is prone to defects such as holes, cracks, composition, structure and performance, which to a certain extent leads to the failure of some output valve bodies to meet safety and reliability. Requirements, disguised to increase the cost, and the method of large steel block processing materi...

AI Technical Summary

Problems solved by technology

[0002] At present, the valve parts used in the speed control system of large-scale hydraulic turbines at home and abroad, such as the main pressure distribution valve, emergency pressure distribution valve and isolation valve, etc., are all large in size, and their valve bodies are mostly cast or processed from large steel blocks. For casting, its molding process is cumbersome, the cost is high, and the casting itself is prone to defects such as holes, cracks, composition, structure and performance, which to a certain extent leads to the failure of some output valve bodies to meet safety and reliability. Requirements, disguised to increase the cost, and the method of large steel block processing material waste is serious, the processing cost is high, and the feasibility is low. Therefore, it is necessary to optimize and improve the processing technology for the defects of the current processing method of valve parts and valve bodies.