Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Reexamination Certificate
2001-07-25
2011-11-29
Lee, Kevin (Department: 3753)
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
C251S030030
Reexamination Certificate
active
08066255
ABSTRACT:
A solenoid valve has a main body defining a gas inlet passage, a gas outlet passage, and a cavity; a core tube forming a closure for said cavity so as to prevent an escape of gas; a cylindrical main piston slidably movable in said cavity of said main body, said main piston forming a front chamber and a back chamber in said main body, said main piston having a gas conduit for passing the gas from said gas inlet passage to said front chamber and an axial hole for passing the gas from said back chamber into said gas outlet passage with a bleed orifice at one end of said axial hole; said main piston being spring biased to a closed position; a spring biased pilot piston; and electrical coil means associated with said core tube to provide a magnetic field for movements of said pilot piston and said main piston, so that when said coil means is deenergized said pilot piston closes said outlet passage and causes a pressure equalization allowing said return spring to push said main piston to close the valve, while when said coil means is energized said pilot valve opens said outlet passage and lowers a pressure which causes pushing of said main piston to open the valve.
REFERENCES:
patent: 4799645 (1989-01-01), Kramer et al.
patent: 5538026 (1996-07-01), Kazi
patent: 6435210 (2002-08-01), Obersteiner et al.
patent: 6443420 (2002-09-01), Hettinger
patent: 7341236 (2008-03-01), Stephenson et al.
Lee Kevin
Ridout & Maybee LLP
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