| 摘要 |
<p>A disposable ball valve wherein the union is adhered inside the valve body of the valve housing so as to form the valve chamber for rotatably receiving the ball therein. On the surfaces of the valve body and the union facing the ball, annular grooves of rectangular cross section are formed. Within the annular grooves, there are fitted annular seating rings made of polytetrafluoroethylene backed by resilient rubber rings. Thus, the ball and the union do not disconnect from the valve housing by applied fluid pressure, and the sealing effect of the ball valve can be maintained for a long period of time. In addition, the contact surfaces of the valve housing and the tubular caps are formed in the shape of complementary spheres slidable with each other. Thus, even if the pipelines are deviated from the axis of the flow passage due to external forces, the ball valve substantially will not receive such excess forces.</p> |
