The leakage problem of the valve stem sealing structure of the knife type gate valve has been solved

in the pastKnife type gate valveThe valve stem is prone to leakage and the sealing effect is not ideal. It was only after structural improvement that it improved significantly.

The sealing structure of the valve stem of a knife type gate valve mainly consists of a valve body and a valve stem that rotates inside the valve body. The main feature of this structure is that both ends of the valve stem are stepped structures, and a receiving chamber is set inside the valve body to place the lower end of the valve stem. A copper sleeve 1 is set inside the valve body above the receiving chamber to support the stepped structure of the lower end of the valve stem, and the lower end of the valve stem can rotate relative to the copper sleeve; A copper sleeve 2 and a pressure sleeve are installed on the stepped structure at the upper end of the valve stem, and the pressure sleeve is fixedly connected to the valve body. The pressure sleeve includes a pipe part and a circular ring part set on the outer wall of the pipe part. A sealing ring installation groove 1 and a sealing ring installation groove 2 are set on the inner circumferential surface of the pipe part, and a sealing ring installation groove 3 is set on the contact surface between the circular ring part and the valve body. Three sealing rings are correspondingly set in the three sealing ring installation grooves.

This new type of knife shaped gate valve stem structure solves the technical problem of valve stem leakage.