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Class Information
Number: 137/247.25
Name: Fluid handling > With liquid valves or liquid trap seals > Liquid seal in liquid flow line; flow liquid forms seal > Seal replenishers
Description: Devices having (1) a distinct compartment with a restricted orifice which stores flow line liquid during flow and discharges it into the seal after the flow ceases in order to assure a seal or replace lost seal liquid, or (2) a connection to an outside source of seal liquid for the same purpose.










Patents under this class:

Patent Number Title Of Patent Date Issued
8671970 Flow-through trap primer valve assembly Mar. 18, 2014
8602051 Trap-primer system for floor drains Dec. 10, 2013
7882851 Pressure activated trap primer and water hammer combination Feb. 8, 2011
7520292 Pressure activated trap primer and water hammer combination Apr. 21, 2009
6834665 Automatic adjustable trap priming valve Dec. 28, 2004
6629621 Gauge hatch with liquid seal Oct. 7, 2003
6422260 Trap primer Jul. 23, 2002
6325091 Water distribution apparatus for multiple sewer drain trap primer systems Dec. 4, 2001
6152164 Pressure-drop activated trap seal primer valve Nov. 28, 2000
6056005 Vent valve with liquid seal May. 2, 2000
6041809 Two stage flush control valve assembly Mar. 28, 2000
5797419 Sewer line trap priming assembly and antisiphoning conduit component therefor Aug. 25, 1998
5678588 Sewer line multiple trap priming system and method Oct. 21, 1997
5287877 Sewer drain trap primer valve Feb. 22, 1994
5263508 Sewer line water trap charging valve with improved adjustment for house line pressure changes Nov. 23, 1993
5253670 Multiple drain trap primer valve assembly for sewer lines Oct. 19, 1993
5184640 Back water trap Feb. 9, 1993
4880027 Method of and apparatus for regulating the flow of at least one gas stream Nov. 14, 1989
4773441 Liquid seal vent Sep. 27, 1988
4728486 Pressurized water nuclear reactor pressure control system and method of operating same Mar. 1, 1988
4574399 Flushing, toilet tank-fed, primer valve for sewer line drain traps Mar. 11, 1986
4502500 Water traps Mar. 5, 1985
4497337 Floor trap primer valve Feb. 5, 1985
4249559 Reliable trap filling device for siphon apparatus Feb. 10, 1981
4222405 Pressure vacuum breaker Sep. 16, 1980
4218786 Water saving trap primer Aug. 26, 1980
4204556 Self-contained, automatic primer valve for sewer line drain traps May. 27, 1980
4193967 Liquid sealing apparatus for sealing vapors in a tank Mar. 18, 1980











 
 
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