| 摘要 |
PCT No. PCT/EP92/02242 Sec. 371 Date Mar. 21, 1994 Sec. 102(e) Date Mar. 21, 1994 PCT Filed Sep. 25, 1992 PCT Pub. No. WO94/05526 PCT Pub. Date Mar. 17, 1994.A self-sealing coupling comprising two coupling parts each having an obturating member which seals automatically when the coupling parts are disconnected, and a ring seal which mates in a fluid tight manner with the corresponding ring seal of the other coupling part when the coupling is engaged. One of the obturating members has a conical elastomeric face seal which is relaxed when the coupling is made and the two obturating members are displaced to one side of the mating ring seals for fluid flow. A tapering annular clearance is formed between the faces of the obturating members when the elastomeric face seal is in a natural relaxed state. The arrangement is such that the conical face seal is flattened by the thrust that reseats the two obturating members so that the tapering annular clearance between it and the flat face of the other obturating member is taken up and fluid between the obturating members is squeezed out to a location upstream of the ring seals. |
