Stem nut in the valve opening and closing process, the direct bearing stem axial force, it must have a certain strength. At the same time it is with the stem is threaded drive, requiring a small friction coefficient, no rust and avoid biting dead. First, the copper alloy copper alloy friction coefficient is small, not rusty, is currently one of the commonly used materials. For Pg two, when the working conditions do not allow the use of copper alloy, you can choose 35,40 and other high-quality carbon steel, 2Cr13, 1Cr18Ni9, Cr17Ni2 and other stainless steel acid-resistant steel. Working conditions are not allowed to refer to the following situations. 1, for the valve on the electric valve with melon clutch stem nut, need heat treatment to obtain high hardness or surface hardness. 2, the working medium or the surrounding environment is not suitable for use of copper alloy, such as copper corrosion of ammonia medium. Selection of steel stem nut, pay special attention to the thread bite death phenomenon.
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