| 摘要 |
Non-return valve of the type having a hollow body (1), two sockets (3-4) to which are connected, respectively, the inlet and outlet pipes, a seat (6) and a closure member (7) which is pushed against the said seat, counter to the normal flow of the fluid, by a spring (8) retained in the said body by a plug (9) characterised in that the closure member (7) has an orifice (15) and a skirt (10) extending downstream of the direction of flow of the fluid and communicating with the outlet socket (3), the said skirt being sealed leaktightly by a piston (11) pushed towards the end (10a) of the skirt by a spring (12) inserted between the said piston and the closure member (7). <IMAGE> |
