F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
F16K 15/06 (2006.01) B60T 13/24 (2006.01) F16K 15/14 (2006.01)
Patent
CA 2120238
2120238 9308059 PCTABS00021 A check valve (10) for use in the evacuation of air from a system having primary and secondary disc (32, 34) retained in a chamber of the housing (12) and responsive to first and second forces developed by the creation of a fluid pressure differential between the fluid pressure of air in a first member and a source of vacuum to control the evacuation of air from the member by the source of vacuum. The primary disc is located on a stem (38) that extends from the secondary disc to cover a plurality of openings (42, 42') which connect the inlet port (16) to the chamber. A spring (52) holds the secondary disc against the housing. The first force which develops as a result of a pressure differential between the fluid pressure of air and vacuum moves the primary disc to allow air to be evacuated through the openings in the secondary disc. Should the fluid pressure in the air located in the first member exceed a predetermined value, the second force develops which acts on the secondary disc to allow a larger volume of air to be evacuated in a shorter time. A tang (50) on the secondary disc engages the housing to prevent the development of vibrations therein when air is evacuated as a result or movement by the secondary disc. When the fluid pressure of the air is reduced to a predetermined fluid pressure, a spring moves the secondary disc into engagement with the housing and the evacuation of air is again through the openings in the secondary disc as controlled by the first disc.
Allied-Signal Inc.
Gowling Lafleur Henderson Llp
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