Patent ID: 6976668
Filing Date: 2005-12-20
Classification: F16K,Y10T

Abstract:
1. A diaphragm control valve comprising: a) a valve body with an upstream port and a downstream port, and a valve seat formed between said upstream and downstream ports; b) a plug housing extending from said valve body between said upstream and downstream ports, at least a portion of an interior volume of said plug housing at least partially defining a control chamber; c) a displaceable valve plug at least partially deployed within said plug housing so as to be displaceable between a closed position, in which a sealing portion of said valve plug abuts said valve seat, and an open position, in which said sealing portion of said valve plug is separated from said valve seat; and d) a flexible diaphragm sealingly attached to said valve plug, said diaphragm sealing said control chamber from at least a portion of said downstream port, said diaphragm having a substantially “S” shaped cross section such that a distance of said valve plug displacement within said plug housing on each side of a central plane of attachment between said diaphragm and said plug housing is at least about twenty percent of an outer diameter of said diaphragm, providing a total distance of said valve plug displacement within said plug housing of at least about forty percent of an outer diameter of said diaphragm; wherein said valve plug is configured to be slidingly longitudinally displaceable within plug housing, and said plug housing further comprises a plurality of substantially longitudinal guide ribs configured on at least one side wall so as to guide said displacement of said valve plug.