How to adjust the opening and closing degree when the pneumatic metal seal butterfly valve cannot be closed? 4. Operation and application
1) Before operation, confirm that pipelines and valves have been washed.
2) The operation of the valve drives the valve rod to rotate and complete according to the size of the input signal of the actuator: when the valve rotates 1/4 circle (90 °) in the positive direction, the valve is closed. When the valve is rotated 1/4 turn (90 °) in the opposite direction, the valve is open.
3) When the direction indicating arrow of the actuator is parallel to the pipeline, the valve is open; When the arrow is straight with the pipeline, the valve is closed.
5. The repair has a long service life and repair free period, which will depend on the following factors: normal working conditions, temperature/pressure ratio for consistent reconciliation, and reasonable corrosion data
、 The popular reason of pneumatic butterfly valve 1. The butterfly valve is simple in structure, small in volume, light in weight, low in material consumption, small in installation size, fast in opening and closing, 90 ° reciprocating rotation, small in driving torque, etc. It is used to cut off, connect, and regulate the medium in the pipeline, and has good fluid control characteristics and closing sealing performance. 2. The butterfly valve can transport mud, and the liquid accumulated at the pipe mouth is the least. Good sealing can be achieved under low pressure. Good adjustment performance. 3. The streamline design of butterfly valve plate makes the fluid resistance loss small, which can be said to be an energy-saving product. 4. The valve stem of butterfly valve is of through stem structure. After quenching and tempering treatment, it has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the pneumatic butterfly valve is opened and closed, the valve stem only rotates rather than moves up and down. The packing of the valve stem is not easy to be damaged and the sealing is reliable. It is fixed with the taper pin of the butterfly plate, and the extended end is designed to prevent the valve rod from collapsing when the connection between the valve rod and the butterfly plate is accidentally broken.
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