Butterfly valve overview
In the 1930s, the United States daring to butterfly valves, introduced to Japan in the 1950s, and later introduced to China, and I was able to promote the technical requirements of general electric butterfly valves after 70 years:
The valve stem is connected by a square shaft or a key on the butterfly plate, and has a large flow area, a large pressure resistant area, good pressure resistance, reliable opening and closing, and a positive and negative two-way sealing function. The installation is not restricted by the flow direction of the medium, and is not subject to the position of the space. It can be installed in the pipeline. The valve is rotated 90 degrees by the valve shaft to drive the valve plate. The rubber seal ring is mounted on the arbitrarily. The valve is driven by the valve shaft and the valve plate is made of 98 degrees. The valve body is easy to repair and can be repaired online.
The valve stem and the disc should be absolutely coaxial. When the valve is at the maximum pressure difference, the flow in both directions can be guaranteed. The full opening and closing flow area is the largest. When the valve is fully closed, the valve body and the butterfly valve plate are at the valve shaft. There should be no leakage in the seal. Valves and stems must not allow any packing. The technical requirements in this area are very important.