Fire extinguishers – Fluid systems – Distributing systems
Reexamination Certificate
2008-01-29
2008-01-29
Nguyen, Dinh Q. (Department: 3752)
Fire extinguishers
Fluid systems
Distributing systems
C169S022000, C169S019000, C169S020000, C137S516250, C137S527800, C137S559000, C251S074000
Reexamination Certificate
active
07322423
ABSTRACT:
A fire protection system comprises a supply pipe having a first fluid pressurized to a first pressure and a network of pipes having a plurality of sprinklers. The network of pipes have a second fluid being pressurized to a second pressure at approximately 5.5 times the first pressure. The system further comprises a dry pipe valve including a body defining a passage extending along a longitudinal axis between an inlet coupled to the supply pipe and an outlet coupled to the network of pipes. The inlet has an inlet diameter of approximately WD inches and a seat disposed in the body has a seating surface with a diameter AD approximately less than two times WD inches. The dry pipe valve further includes a clapper pivotable about an axis orthogonal to the longitudinal axis between a first position occluding the passage when the ratio of the second pressure to the first pressure is at least 5.5 and a second position permitting fluid flow through the passage when the ratio is less than 5.5.
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Grinnell LLC
Nguyen Dinh Q.
Proskauer Rose LLP
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