A21F, A21H, A21W, A21Y micro type external thread safety valve and ball Industrial Valves spring difference is large, we can distinguish from the function to go up and ball valve and A21F, A21H, A21W, A21Y micro rev. Type the different function of external thread the relief Industrial Valves spring, from ball valve and A21F, A21H, A21W, A21Y spring up tiny qi type external thread safety valve structure. 【 Functional difference between 】 Such media equipment or piping. A21W - P, R type is suitable for the temperature of 200 ℃ or less corrosive gas or liquid equipment or piping, as the overpressure protection device. A21Y type is suitable for the temperature of 100 ℃ or less liquefied petroleum gas, etc. Ball valve and A21F, A21H, A21W, micro rev A21Y spring type external thread safety valve difference is bigger, ball valve, 球阀) Opening and closing is a sphere, driven by the valve stem, and for ball valve axis rotate 90 & deg; Open or closed. Can also be used on regulation and control of fluid, mainly used for cutting in line, distribution, and change the flow direction of medium, good sealing, convenient operation, opening and closing fast, simple structure, small volume, small resistance, light weight, etc. 【 Physical difference between 】 A21F, A21H, A21W, A21Y external thread the relief valve spring tiny qi type ball valve 【 Summary 】 A21F, A21H, A21W, A21Y spring type external thread safety valve and ball valve and the difference function, are quite different in application, in the selection of a certain need to pay special attention to diameter, pressure, material and use of media, whether at design time, or in the purchase, must be in strict accordance with the relevant technical requirements.
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