| 摘要 |
The non-return valve (1) contains a body (22) hollowed out to form a transverse chamber (221) in which is guided a moving piston (21). One end of the chamber has an orifice whose end faces the seat (13) for the piston and at the other end, an open orifice. The body (22) contains channels (227) cutting through its lateral walls which come out into the chamber (221) where slides the piston (21). Piston locking balls (23) are partially lodged in these channels and the surround of the piston has a peripheral throat (215). The balls (23) are free to move in these channels from a position where they are normally disengaged from the throat (215) to a position where they penetrate the throat (215) and hold the piston (21) off its seat (13). This is actuated by an unlocking piece (3) which is introduced via the annular channel (14), which forms part of the housing (12) for the fixing of the valve. The body contains admission holes (226) which join the outside to the inner chamber (221). |
