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Valve basic knowledge 4 - Stem Nut Material

  • 2021-05-03 10:14

The stem nut directly bears the axial force of the stem during the opening and closing of the valve, so it must have a certain strength. At the same time, it and the valve stem are threaded transmission, which requires a small friction coefficient, no rust and avoid seizure.
 

1. Copper alloy

Copper alloy has a small coefficient of friction and does not rust, and it is one of the commonly used materials at present. For low pressure valves with Pg<1.6Mpa, ZHMn58-2-2 cast brass can be used.

For Pg16-6.4Mpa medium pressure valve, ZQAL9-4 Wuxi bronze can be used. For high pressure valves, ZHAL66-6-3-2 cast brass can be used.

2. Steel

When working conditions do not allow the use of copper alloys, high-quality carbon steels such as 35 and 40 can be selected, and stainless and acid-resistant steels such as 2Cr13, 1Cr18Ni9, and Cr17Ni2 can be used.

Working conditions are not allowed to refer to the following situations.

1. For electric valves, stem nuts with melon clutches require heat treatment to obtain high hardness or surface hardness.

2. When the working medium or surrounding environment is not suitable for copper alloys, such as ammonia medium that corrodes copper.

When selecting steel stem nuts, pay special attention to thread seizure. 

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