F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
F16K 31/08 (2006.01) F16K 1/30 (2006.01) F16K 31/40 (2006.01) F02M 21/02 (2006.01)
Patent
CA 2312186
The present invention provides a valve for controlling flow of gas from a pressure vessel comprising a fluid passage, a first valve seat mounted in the fluid passage and including an orifice, a sleeve including a second valve seat and an orifice opening into the pressure vessel, a secondary piston slidably carried within the sleeve and including a first sealing surface for closing the orifice of the first valve seat, a bleed passageway extending through the secondary piston, and a third valve seat including an orifice opening into the bleed passageway, and a primary piston slidably carried within the same sleeve and including a second sealing surface for closing the orifice of the third valve seat of the secondary piston, and a third sealing surface for closing the orifice of the sleeve. The secondary piston can further include a body such that the bleed passageway is formed within the body. The bleed passageway can communicate with the fluid passage. A biasing means can be provided for biasing the primary piston towards the secondary piston. The sleeve can further comprise sidewalls extending from the valve seat and terminating at a distal end to define an opening at the distal end. The body of the secondary piston can include a periphery wherein a sealing member is carried at the periphery of the body between the body and the sleeve, thereby preventing gas from flowing between the periphery of the body and the sleeve. The primary piston can be biased towards the first position by a resilient member, such as a spring means. The valve can further comprise an outlet port and a first throughbore, wherein the first throughbore extends from the outlet port to the orifice of the first valve seat, and a manual override valve is disposed between the orifice of the first valve seat and the outlet port for selectively sealing the flow passage. The secondary piston can comprise a first part and a second part such that the first part comprises a non- magnetic material and the second part comprises magnetic material.
Gfi Control Systems Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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