Bidirectional cryogenic valves

Details Bidirectional cryogenic valves Bidirectional cryogenic valves

F - Mech Eng,Light,Heat,Weapons

16

K

251/28

F16K 1/226 (2006.01) F16K 1/228 (2006.01)

Patent

CA 1233807

Abstract A bidirectional valve useful at all temperatures from cryogenic to extreme fire tempera- tures. The sealing means for the bidirectional valve comprises a metallic sealing element having a pair of spaced sealing lobes defined thereon which are coated with a Teflon compound. A third sealing lobe is defined on the metallic sealing element between the pair of sealing lobes and is constructed solely of metal. The pair of coated sealing lobes further function as wipers to prevent sand, dirt or similar foreign particles from becoming crushed between the valve disc and metallic sealing lobe during the final closing of the valve. When the valve is exposed to fire conditions, the Teflon coated sealing lobes melt out leaving the metallic lobe as the fire safe sealing lobe.

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