Butterfly valve

摘要

The butterfly valve diverts a fluid flow to different outlets. It has a plastics body with a one-piece valve member formed of thermoplastic elastomer. It has an integral hub with torque transmitting surfaces which are engaged by lugs on a rigid shaft received in the hub and the shaft is journalled for rotation in the valve body. The valve member has integral thin blade portions extending in opposite directions from the hub with a thickened rim formed about the periphery of the blade with the edge of the rim preferably chamfered. The preferred butterfly member has integral stiffening ribs extending centrally from the hub along the blades to the rim.