F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/45
F16K 5/14 (2006.01) F16K 1/226 (2006.01) F16K 5/06 (2006.01)
Patent
CA 1128030
ABSTRACT "FIRESAFE FLUID CONTROL VALVE" A valve member 17 when positioned so as to prevent fluid flow through a passage 11 in a valve body 10 engages a ring 14 made of flexible resilient fluorocarbon synthetic resin material, the ring 14 providing a fluid- tight seal between the valve member 17 and a seat 12 on the body 10. In the event of the ring 14 failing, the valve member 17 engages a back-up ring 15 made of a high temperature, non-metallic material which is non-galling, such as graphite. The high temperature properties of the ring 15 thus enable the valve to remain fluid-tight when shut even if the flexible ring 14 is destroyed by fire. The ring 15 can be compression- formed in situ into a shape which ensures close contact with the valve member 17. In the event of the ring 15 also failing, the valve member 17 comes into contact with a metallic ring 13 from which it is normally spaced and thereby restricts the flow of fluid through the valve. This arrangement can be applied to butterfly-type valves (Figure 1) as well as to ball-type valves (Figure 4).
345372
Nash Langley V.
Newton Frederick J.
Marks & Clerk
Serck Industries Limited
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