Type of fertilizer industry in China with H22 hydrogen nitrogen tightening machine more than 30 annular valve, at present due to air valve failure be tightening machine problems. To deal with this problem, the valve manufacturer to stop a valve failure reason analysis and using life of the statistics, found that there are a lot of air valve can use was changed, and the main reason is: 1. Lift limiter valve guide block on radial a lot of wear and tear, valve plates and the clearance between the guide block by 0. About 2 mm to 1 mm ~ 2 mm, this valve can't fall in the right place after the movement on and off the seat sealing surface. Of high pressure valve is especially striking. The solution: change the wear serious lift limiter. 2. After the valve seat sealing surface repairing, often make the seat of the groove is very shallow, to enable the convex platform on the lift limiter grooves at the bottom of the seat, so sometimes not positioning convex function, cause Industrial Valves plates off the seat sealing surface. The solution: at the same time in the processing of the Industrial Valves seat sealing surface processing groove bottom, make the depth of the grooves stick to the original, so, uniform annular Industrial Valves utilizing life can reach more than half a year.
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