초록 ▼

A gaseous-material evacuation system includes a filter assembly (44) with a housing (56) containing filter material (58) with a downstream porous filter member (60) at a downstream side of the filter material. The filter assembly includes a valve (64) with a movable valve member (66) for moving in a

A gaseous-material evacuation system includes a filter assembly (44) with a housing (56) containing filter material (58) with a downstream porous filter member (60) at a downstream side of the filter material. The filter assembly includes a valve (64) with a movable valve member (66) for moving in a direction of gas flow and having a breadth area dimension that is at least as great as that of the downstream surface of the downstream porous filter member. In a preferred embodiment, a spring member (68) presses the movable valve member (66) against the porous filter member (60), thereby stopping gaseous flow, but yields when gaseous materials are driven through the filter at a predetermined pressure. The valve member is mounted in a sub-compartment (72) of the housing, which is of a single-piece housing member.

대표청구항 ▼

1. An evacuation system comprising:a releasing device for releasing pressurized gaseous materials, said releasing device including a check valve for allowing flow of said pressurized gaseous materials away from said releasing device in a first direction, but not allowing it to return in an opposite

1. An evacuation system comprising:a releasing device for releasing pressurized gaseous materials, said releasing device including a check valve for allowing flow of said pressurized gaseous materials away from said releasing device in a first direction, but not allowing it to return in an opposite direction; a receptacle communicating with the releasing device and receiving the pressurized gaseous materials; a filter assembly comprising a housing for communicating with the receptacle, said housing containing filter material; wherein said filter assembly further includes a valve comprising a movable valve member for moving in an opposite direction to gaseous materials flowing through said filter assembly for stopping flow of said pressurized gaseous materials from said receptacle through said filter assembly and for moving in the direction of gaseous materials flowing through said filter assembly for allowing said flow; whereby said evacuation system is a closed system.