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Class Information
Number: 137/247.11
Name: Fluid handling > With liquid valves or liquid trap seals > Liquid seal in liquid flow line; flow liquid forms seal
Description: Apparatus comprising a U-shaped flow passage which retains a portion of a line flow liquid to provide a gas seal in the said line.










Sub-classes under this class:

Class Number Class Name Patents
137/247.29 Divided and recombined passages 9
137/247.33 Downward partition encircles projecting outlet 9
137/247.27 Plural inlet 16
137/247.25 Seal replenishers 28
137/247.35 Submerged inlet pipe end 16
137/247.31 Tangential inlet flow 2
137/247.41 U-seals 30
137/247.13 Valves 6


Patents under this class:

Patent Number Title Of Patent Date Issued
8646117 Anti-siphon trap with snorkel Feb. 11, 2014
8485216 Flow trap with compartment separator and baffle for use in a water-free urinal Jul. 16, 2013
8382993 Drain filter apparatus and method Feb. 26, 2013
7854238 Conduit trap and condensation recovery device Dec. 21, 2010
7575022 Diverter, liquid-level indicator and chemical pre-treatment and post-treatment implementations useful in waterless urinals Aug. 18, 2009
7571741 Flow trap with compartment separator and baffle for use in a waterless urinal Aug. 11, 2009
7120949 Multi-purpose drain Oct. 17, 2006
6589440 Waterless urinal with liquid seal, liquid seal and method of using liquid seal Jul. 8, 2003
6543470 Flexible trap for drains Apr. 8, 2003
6250331 Zero crack-pressure, high-flow valve Jun. 26, 2001
5176165 Air gap apparatus Jan. 5, 1993
5028320 Sewer catch basin with gas seal for a petroleum refinery or chemical processing plant Jul. 2, 1991
4953235 Trap fitting assembly Sep. 4, 1990
4831875 Water trap valve for fail safe operation of an air inleakage monitoring system in a steam turbine May. 23, 1989
4706701 Odor trap assembly Nov. 17, 1987
4524795 Hydraulic device for the drainage of waste water Jun. 25, 1985
4432384 Sewer fluid trap Feb. 21, 1984
4198717 Modular assembly for drain trap Apr. 22, 1980











 
 
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