| 摘要 |
The device has an elastic ring (1) provided at an inner pipe, and comprising sealing lips (2) at outer side, where the sealing lips are arranged at a distance from edges of the ring. The ring has a larger cross-section than that of the sealing lips, where inner radius of the ring is smaller than outer radius of the inner pipe. The ring has a sleeve encompassing the pipe with a fixed seat, where the ring and the sealing lips are made of rubber e.g. ethylene propylene diene M-class rubber, through an injection molding. |
