US PATENT SUBCLASS 239 / 574
.~ Serially arranged valves (e.g., trap or wet flow line)

Current as of: June, 1999
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239 /   HD   FLUID SPRINKLING, SPRAYING, AND DIFFUSING

569  DF  INCLUDING VALVE MEANS IN FLOW LINE {11}
574.~ Serially arranged valves (e.g., trap or wet flow line)

DEFINITION

Classification: 239/574

(under subclass 569) Apparatus comprising at least two flow controlling means arranged in the flow line at spaced points along the direction of flow.