Installation and removal of valves

The connection parts such as nut, spring washer, stop washer, cotter pin are commonly used to prevent the nut from loosening. The connection structure of stem and closure part is usually used the method of stopping washer and flange washer to prevent looseness, and the effect is better.

 

In addition, the methods used to prevent the valve from loosening include the fixing method of riding screw (riding screw) and point riveting method, both of which are used in the case of not often dismantling. Point riveting is to rivet two or more points with a foreign punch point at the thread where the nut and bolt mesh, so that the thread is extruded and deformed to prevent loosening. If the nut is loose, it is difficult to solve the above method, the bonding method can be used.