VENT VALVE AND CONTAINER THEREWITH

摘要

In one embodiment, the valve (100) comprises: (a) a housing (101) configured to interengage with a container (401), and having at least one axis (101a) and at least one aperture (105); (b) a first poppet (110) axially movably within said housing (101) between a first closed position and a first open position; (c) a second poppet (120) axially movable within said first poppet (110) between a second closed position and a second open position; (d) a first seal (111) between said first poppet (110) and said housing (101); (e) a second seal (121) between said first poppet (110) and said second poppet (120); (f) a first resilient member (112) disposed within a first space (130) between said housing(101) and said first poppet (110), and having a resilient force sufficient to hold said first poppet (110) in said first closed position such that said first poppet (110) urges said first seal (111) against said housing (101) when a pressure differential axially across said first poppet (110) is below a first point, and to allow said first poppet (110) to move in said first direction to said first open position when said fluid pressure differential exceeds said first point; and (g) a second resilient member (122) disposed within a second space (140) between said first poppet (110) and said second poppet (120), and having a resilient force sufficient to hold said second poppet (120) in said closed position such that that said second poppet (120) urges said second seal (121) against said first poppet (110) when a pressure differential axially across said second poppet (120) is below a second point, and to allow said second poppet (120) to move in a second direction, different from said first direction, to said second open position when said pressure differential exceeds said second point.