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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 |
| 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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