| 摘要 |
<p>1. Direct-throughflow two-position valve having an inlet orifice (2) connected to a pressure-fluid storage container or circuit, the inlet orifice (2) and an outlet orifice (15) being coaxial, one of the two orifices being closed by a rupturable cap (12), and a hollow striker (16) sliding in sealing-tight manner in the housing (1) of the valve between a position of rest and a position in which the valve is open, these positions being defined respectively by an upstream shoulder (6) and a downstream shoulder which are integral with the valve housing (1) ; the striker (16) having an upstream tubular portion (18b), a collar (16a) and a tubular downstream portion (16c), one of the said portions (16b, 16c) being bevelled at its end for on the one hand piercing the rupturable cap (12) and for on the other hand forming a small passage for fluid at the level of one of the shoulders in the position of rest, characterised in that the rupturable cap (12) closes the outlet orifice (15) and that the downstream tubular portion (16c) of the striker (16) is bevelled at its end ; in that the upstream tubular portion (16b) of the striker has a cross-section greater than that of the downstream tubular portion (16c), in such a manner that the collar (16a) of the striker (16) constitutes a differential piston and that the position of rest of the striker (16) is obtained by the pressure exerted by the fluid, and in that a triggering device is provided for suddenly lowering the pressure at the downstream side of the striker (16) and causing it to slide towards the open valve position, piercing the cap (12).</p> |
