Valves and valve actuation – Electrically actuated valve – With means to bias valve open
Reexamination Certificate
2008-02-11
2010-11-16
Fristoe, Jr., John K (Department: 3753)
Valves and valve actuation
Electrically actuated valve
With means to bias valve open
C251S129150
Reexamination Certificate
active
07832707
ABSTRACT:
A normally open electromagnetic valve includes a fixed core, a movable core, a coil, a valve body, a valve seat member, a return spring, a raised portion formed at one of the fixed and movable core so as to project towards the other core and a recessed portion formed at the other core so as to face the raised portion. A relationship between the raised and recessed portions is set such that while a distance therebetween is within a predetermined range, an attraction force acting between the fixed core and the movable core by virtue of an excitation force of the coil decreases as the raised portion approaches or moves into the recessed portion, and when the valve body and the valve seat surface are brought into abutment with each other by exiting the coil, the distance between the raised portion and the recessed portion stays within the predetermined range.
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European Search Report for corresponding application No. EP 08002712.1.
Masuda Naoki
Shigeta Masaya
Calderon Andrew M.
Fristoe, Jr. John K
Nissin Kogyo Co. Ltd.
Roberts Mlotkowski Safran & Cole P.C.
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