Butterfly valve
Stem in butterfly plate is connected with the shaft or key, big flow area, the compressive area is big, good pressure resistance, opening and closing, reliable and has the positive and negative two-way sealing function. Installed in the flow direction of medium is not subject to restrictions, nor to by space position, can rise in pipe installation. Valve is driven by valve shaft disc valve plate 90 - degree rotation. The rubber sealing ring is with broom at any installation. Valve by valve spindle drive valve plate, valve plate does turn of 98 degrees, body sealing Jane maintenance, and then it can repair online.
Stem and disc should be absolutely the coaxial, maximum differential pressure across the valve, the flow of the two directions are guarantee, all into the port area, the largest complete closed when seated, the body and the butterfly valve plate in the valve shaft in the seal should be no leakage. Valves and valve stem can't allow any packing. This is an important technical requirement.
