Which vacuum valves are used on the vacuum pipe

The pressure loss of the pipeline (both the pressure difference before and after the valve), that is, the valve has a certain resistance to the flow of the medium, the medium consumes a certain amount of energy to overcome the resistance of the valve. In terms of energy conservation, when designing and manufacturing valves, it is necessary to reduce the resistance of the valve to the flowing medium as much as possible.
 
  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. When closing the valve, it is necessary to form a certain sealing pressure between the opening and closing parts and the sealing surface of the bearing seat, and at the same time overcome the between the valve stem and the packing, between the thread of the valve stem and the nut, and at the end of the valve stem and The friction of 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. The maximum value is the final moment or opening of the closing. The initial moment. When designing and manufacturing valves, it is important to reduce their closing force.
 
  Vacuum valves can be divided into high vacuum butterfly valves, high vacuum ball valves, high vacuum flap valves, high vacuum diaphragm valves and vacuum solenoid valves.