Installation Requirements and Precautions of Pneumatic Butterfly Valve
Pneumatic butterfly valve equipment requirements: 1、pneumatic butterfly valveEquipment attention medium fluid direction and arrow direction 2, pneumatic butterfly valve stem valve can not contact the equipment, to avoid corrosion of the valve stem, there is a cover plate in the trench, the valve should be equipment and maintenance and inspection and operation
Pneumatic butterfly valve equipment requirements:
1、pneumatic butterfly valveEquipment attention medium fluid direction and arrow direction
2, pneumatic butterfly valve stem valve can not contact the equipment, to avoid corrosion of the valve stem, there is a cover plate in the trench, the valve should be equipment and maintenance and inspection and operation
3. When the pneumatic butterfly valve is in the horizontal pipeline equipment, the valve stem should be straight up, or skew at a certain angle, and the valve stem is not allowed to go down.
4. For valves connected by flanges and threads, the valve should be closed when the equipment is in use. Equipment flange type valve, to ensure that the flange ends parallel to each other and concentric.
1. The relationship between the opening of the pneumatic butterfly valve and the flow rate is basically a linear change in share. If it is used to control the flow, its flow characteristics and the flow resistance of the piping are also closely related, such as the two pipeline equipment valve diameter, form, etc. are all the same, and the pipeline loss coefficient is different, the valve flow difference will be very large.
2. If the valve is in a state of saving ups and downs, the reverse side of the valve plate is prone to cavitation, and if there is damage to the valve, it is generally used outside 15 degrees.
3. When the pneumatic butterfly valve is in the middle opening degree, the opening shape formed by the valve body and the front end of the butterfly plate is centered on the valve shaft, and the two sides form different conditions. The front end of the butterfly plate on one side moves along the direction of water flow, and the other side moves against the direction of water flow. Therefore, the valve body and the valve plate on one side form a nozzle-like opening, and the nozzle side has a much faster flow rate than the saving hole-saving side, and save side valve below will occur negative pressure, often rubber seals fall.
4, pneumatic butterfly valve operating torque, due to opening and valve opening and closing direction of different values, horizontal pneumatic butterfly valve, especially large diameter valve, because of the water depth, the valve shaft, the head difference of the torque can not be ignored. In addition, when the equipment elbow on the inlet side of the valve is formed, the deflection will be added to the torque. When the valve is in the middle opening, the operating organization needs to be self-locking because of the water flow torque.