| 摘要 |
<p>The tap comprises a closure member (22) in a chamber (20) at the intersection of an axial inlet channel (14) and a radial outlet channel (16), and a valve intended to contain a specific residual pressure in the bottle through the action of a spring (44). This valve consists of an annular cylindrical piston (38) fitted in a leaktight manner in the said chamber (20) downstream of the closure member (22) and defining, around an axial operating rod (28), an annular cylindrical passage space (46) in communication, in the open position, with the outlet channel (16) via at least one radial orifice (48) in the said piston (38). A leaktight seal (50) is provided between the base of the said piston (38) and the head of the closure member (22), whereas the piston is stressed by a spring (44) in the direction of the closure member (22) and comprises means for locking it in a position distant from the said closure member ( 22) against the action of its spring (44).</p> |
