Valves and valve actuation – With correlated flow path – Valve operated by joining flow path sections
Reexamination Certificate
2006-02-14
2006-02-14
Walczak, David J. (Department: 3751)
Valves and valve actuation
With correlated flow path
Valve operated by joining flow path sections
C251S331000, C137S510000
Reexamination Certificate
active
06997435
ABSTRACT:
A valve assembly to avoid or minimise the effect of “compression setting” which occurs when valves control the flow of some hazardous and/or corrosive fluids, especially when at en elevated temperature. The valve assembly includes a valve stem having a head portion which engages with a valve seat in order to close and seal the valve and an elastically deformable portion. In order to allow fluid to flow through the valve, the elastically deformable portion of the valve stem is deformed to allow fluid to pass between the head portion and the valve seat. An additional biasing element such as a cylindrical or conical compression spring is provided to urge the head portion towards contact with the valve seat. In this way, should “compression setting” of the elastic portion of the valve stem take place, the additional spring will ensure that the valve head is still able to be engaged with the valve seat to thereby close the valve.
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patent: 97/42438 (1997-11-01), None
deVore Peter
ITW New Zealand Limited
Walczak David J.
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