Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Reexamination Certificate
2006-03-07
2006-03-07
Jacyna, J. Casimer (Department: 3751)
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
C251S331000, C251S061000
Reexamination Certificate
active
07007916
ABSTRACT:
The present invention illustrates an irrigation valve that operates at low flows by providing a guide washer of the valve assembly that prevents diaphragm extrusion. Specifically, the circular channel area of a guide washer of the valve includes spoke-like fins. These fins keep the diaphragm from extruding into the open channel over time, while allowing for easy guide washer manufacturing.
REFERENCES:
patent: 3336843 (1967-08-01), Griswold
patent: 4081171 (1978-03-01), Morgan et al.
patent: 4135696 (1979-01-01), Saarem et al.
patent: 4180236 (1979-12-01), Saarem et al.
patent: 5996608 (1999-12-01), Hunter et al.
patent: 6394413 (2002-05-01), Lohde et al.
Inskeep IP Group, Inc.
Jacyna J. Casimer
The Toro Company
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