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Question:

What exactly is the stem nut, please

What exactly is the stem nut, please

Answer:

The stem nut is composed of a nut cap and a nut rod; the nut cap is provided with a dustproof sealing groove; the inner circumferential surface of the nut rod is successively provided with an upper and a lower annular grooves; the outer periphery of the nut rod is provided with a ring-shaped groove.
Jul 19, 2017
The stem nut has a certain strength and resistance to pressure, because the stem nut is the valve running process, the stem shaft strength directly to the stem nut. The stem nut and stem are rotated with the thread, and the friction coefficient of the stem nut is smaller.
Jul 19, 2017
Only in this way can the phenomenon of scuffing or rust be avoided. Stem nut materials are mainly copper alloy, steel and so on. The copper alloy is one of the main materials used for the stem nut. If Pg<1.6Mpa, the stem nut made of brass valves; if Pg16-6.4Mpa, the stem nut can be made of raw materials of Wuxi bronze; if the pressure is high, so the stem nut can be made with brass material. The material for stem nuts can also be made of steel.
Jul 19, 2017
Sometimes it is not possible to use copper alloy stem nuts for production and operation. Because some products or environment will corrode copper medium, the material of the stem nut can not be made of copper. On the basis of the electric valve, the stem nut has a melon clutch, which requires a certain amount of heat treatment to achieve more surface hardness and maximum hardness. When using the steel stem nut, we should pay attention to the thread, and the steel stem nut is easy to bite. But the stem nut is only suitable for low pressure and small bore valves. The strength of the stem nut of this material is less than that of the metal stem nut
Jul 19, 2017

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