The sealing surface of the valve stem is generally divided into two parts, one part is a cylindrical sealing surface, and the other part is an inverted sealing surface.Among them, the cylindrical sealing surface and the inverted sealing surface will corrode after contact with the material body, and the inverted sealing surface will contact the lower cone surface of the bonnet stuffing box.It can prevent leakage of materials.But the performance is not very good.Attention should be paid to the maintenance of the sealing surface of the valve stem:

One is to treat its surface.Methods such as chromium plating, nitriding and quenching can be adopted. After grinding the surface of the sealing surface, many properties such as corrosion resistance and mechanical properties will be lost.Therefore, a certain degree of surface treatment is required to restore these properties.

Second, the shape of the grinding tool can be flat or ring-shaped.When grinding with a flat grinding tool, it is necessary to press the tool on the surface of the sealing surface and move it in four directions, but the precision of this shape grinding is not very high.The grinding method of another kind of grinding tool is more complicated. It needs to be sleeved on the sealing surface of the valve stem and also needs to be coated with plaster. The grinding operation is very complicated.If the sealing surface is not damaged, you can wrap the valve stem with emery cloth and move the emery cloth to achieve the purpose of grinding.

Zhengzhou Ever-Power Co., Ltd. produces wholesale customized standard parts, fasteners, various specifications of bolts, nuts, valve stems, worm gear boxes, bevel gear boxes, etc. For details, please refer to the company’s official website http://www.worm-gearbox. xyz/