F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
F16K 24/00 (2006.01) E03C 1/10 (2006.01)
Patent
CA 2104774
2104774 9214954 PCTABScor01 A valve assembly (15, 15A, 15B) which is suitable for backflow prevention in a stop cock (10) having an inlet (11), a seat (12) and an outlet (13). The valve assembly may be attachable to the stop cock and includes a valve body (20) having at least one opening (24) and also including a valve chamber (26) and a valve seat (23). There is provided a balance tube (30) in the valve body (20) which communicates with the valve chamber (26) which has one end engaged with the stop cock seat (12) for sealing against the seat (12) for prevention of flow of fluid from inlet (11) to outlet (13), a piston (40) located within the valve body (20) and engageable with the valve seat (24), and biasing means (45) operable to unseat the piston (40) from the valve seat (23) to enable the outlet (13) to communicate with the valve body opening (24). In a further embodiment (figure 5) the valve assembly (15B) also includes a third seat (62) in the handle (17) and a valve member (61) biased open by a spring (64) against inlet (11) pressure to allow atmospheric air to break a vacuum at the inlet (11). The fundamental advantage of the valve assembly is that it can prevent backflow when the stop cock is opened or closed and may also be utilised when the downstream pressure exceeds the upstream pressure by a predetermined amount.
Bards Pty Ltd.
Gowling Lafleur Henderson Llp
Valvtec Pty Limited
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