Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Reexamination Certificate
2005-10-25
2005-10-25
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
C137S454500, C251S050000
Reexamination Certificate
active
06957660
ABSTRACT:
A pressure relief valve has a valve element that is biased by a spring into a closed position. A pressure being controlled is applied to the valve element to counter the force of the spring. When the pressure applied to the valve element exceeds the force of the spring the pressure relief opens, otherwise the valve closes. The pressure is applied through a damping orifice which controls the rate at which the applied pressure can increase and decrease thus delaying the response of the pressure relief valve to pressure changes in both directions. The relative size relationship between the inlet and outlet can be varied to define the pressure-flow characteristic of the pressure relief valve.
REFERENCES:
patent: 2351512 (1944-06-01), Holt
patent: 3578019 (1971-05-01), Turolla
patent: 3752174 (1973-08-01), Turolia
patent: 32 00 526 (1983-07-01), None
patent: 196 30 212 (1997-07-01), None
patent: 196 45 172 (1998-05-01), None
patent: 199 46 848 (2001-04-01), None
patent: 101 20 643 (2002-05-01), None
patent: 810 835 (1959-03-01), None
Sheet with two drawings of Assignee's prior valves.
Eaton Corporation
Hepperle Stephen M.
Quarles & Brady LLP
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