• Categories:Industry news
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• Time of issue:2021-01-26 14:34
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(Summary description) Manufacturer Jiangsu Xinhai pipe valve manufacturing Co., Ltd Opening and closing force and moment Opening and closing force and opening and closing moment refer to the force or moment that must be applied to open or close the valve. When closing the valve, it is necessary to form a certain sealing specific pressure between the two sealing surfaces of the headstock and the hair seat. At the same time, it is also necessary to overcome the friction between the stem and the packing, between the threads of the stem and the nut, at the end support of the stem and other friction parts. Therefore, a certain closing force and torque must be applied, The required opening and closing force and moment are variable, and the maximum value is at the final instant of closing or the initial instant of opening. When designing and manufacturing valves, the closing force and torque should be reduced.    Opening and closing speed The opening and closing speed is expressed by the time required for the valve to complete an opening or closing action. Generally, there is no strict requirement for the opening and closing speed of the valve, but there are special requirements for the opening and closing speed of the rotor pump in some working conditions, such as some requirements for rapid opening or closing to prevent accidents, some need to close slowly to prevent water hammer, which should be considered when selecting the type of valve.