Discharge valve performance

The opening and closing force and the opening and closing torque refer to the force or moment that must be applied when the valve is opened or closed. A closed discharge valve, it is necessary to open and close with the fat seat sealing surface of the seal than a certain pressure, but also to overcome between the stem and the packing nut between the threaded stem and the stem end The friction between the bearing and other friction parts must be applied with a certain closing force and closing torque. During the opening and closing process, the required opening and closing force and opening and closing torque are changed, and the large value of the zui is closed. Zui instantaneous or open zui initial moment. When designing and manufacturing valves, it is important to reduce their closing force and closing torque.

Hoisting speed is used to complete a discharge valve opening or closing operation of the time required to represent. Generally, there is no strict requirement for the opening and closing speed of the valve, but some working conditions have special requirements on the opening and closing speed. If some requirements are quickly opened or closed, in case of accidents, some requirements are required to be slowly closed to prevent water hammer, etc. This should be considered when selecting the valve type.