大口径最小回流阀的阀体密封面加工工艺

Fabrication Process for Sealing Face in Large Diameter Minimum Backflow Valve

某公司生产的最小回流阀的密封面要求耐冲蚀,硬度要求较高（HRC35-40）,一般采用堆焊硬质合金Co Cr-A的方式,但大口径（10＂及以上）最小回流阀的焊层厚度在实际生产中却很难保证,进而密封面硬度就很难达到要求。经过长期试验,总结了保证大口径最小回流阀的阀体密封面堆焊层厚度及硬度的加工工艺过程,保证了产品质量,提高了生产效率。

There is a small reflux valve, in which the sealing face is required anti-erosion and high hardness（HRC 35-40）. In general, overlaid hard alloy Co Cr-A should be applied. But in practice for large diameter reflux valve, the overlay thickness required is often difficult to reach, thus the hardness on sealing face cannot be ensured. Through the test for long time, the fabrication process to ensure overlay thickness and hardness on sealing face in large reflux valve was summarized, which can make the products qualified and raises the efficiency of production.