J21W internal and external screw thread the needle Industrial Valves and ball valve difference is bigger, we can distinguish from the function to go up and ball valve and J21W different effects of internal and external thread type needle valve, from ball valve and J21W distinguish between internal and external thread type needle valve structure. 【 Functional difference between 】 J21W type internal and external screw thread the needle Industrial Valves is composed of internal and external screw thread connection, applies to oil, water, gas and other non corrosive or corrosive medium, suitable for - 29℃～+440℃ - 70℃～- 240℃ ≤540℃ ≤570℃。 Than other types of valves, inner and outer screw thread the needle valve type has better sealing performance and the ability to tolerate stress, generally used for small flow high pressure gas or liquid medium sealing, the most appropriate and cooperate with pressure gauge. Ball Industrial Valves and J21W type thread the needle valve inside and outside the difference is larger, 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 】 J21W type internal and external thread the needle valve' Summary 】 J21W internal and external screw thread the needle 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, no matter when the design, or in the purchase, must be in strict accordance with the relevant technical requirements.
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