What is the opening and closing force and torque of instrument valve

What is the opening and closing force and torque of instrument valve
The opening and closing force and opening and closing moment of instrument valve refer to all forces or moments necessary for valve opening or closing. When closing the valve, it is necessary to form a certain sealing pressure between the opening and closing parts and the two sealing surfaces of the hair seat, and 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, it is necessary to apply a certain sealing force and sealing torque, The required opening and closing force and moment are variable, and the maximum value is at the closing moment or the opening moment. When planning and making valves, we should try our best to reduce the sealing force and torque. The opening and closing speed is indicated 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 some working conditions have special requirements for the opening and closing speed. For example, some need to open or close quickly to prevent accidents, and some need to close slowly to prevent water hammer. This should be considered when selecting the type of valve. The temperature of the valve is less than 120 ℃.