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Class Information
Number: 137/247.15
Name: Fluid handling > With liquid valves or liquid trap seals > Liquid seal in liquid flow line; flow liquid forms seal > Valves > Line condition change responsive
Description: Apparatus in which the valve is responsive to a change in the condition of the liquid in the flow line.

Sub-classes under this class:

Class Number Class Name Patents
137/247.21 Ball valve 9
137/247.19 Pivoted valve 5
137/247.17 Plural valves or valve seats 7

Patents under this class:

Patent Number Title Of Patent Date Issued
8672000 Package system with automatic shut-off valve for use with dispensing devices Mar. 18, 2014
8640271 Cartridge unit and trap for sewer gas and odor containment Feb. 4, 2014
7854238 Conduit trap and condensation recovery device Dec. 21, 2010
6273639 Method and apparatus for facilitating migration of fish past dams and other barriers in waterways Aug. 14, 2001
5966076 Fluid leak detector and shut-off device Oct. 12, 1999
5419359 Gas and liquid backflow-preventing valve device for drains May. 30, 1995
5197510 Apparatus for checking back pressure Mar. 30, 1993
4681131 Liquid closing device Jul. 21, 1987
4120331 Low pressure gas regulator Oct. 17, 1978

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