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Class Information
Number: 137/253
Name: Fluid handling > With liquid valves or liquid trap seals > Liquid valves > With auxiliary means for varying liquid level
Description: Apparatus including auxiliary means independent of the flow path for adjusting or varying the height of the liquid in the valve.










Patents under this class:

Patent Number Title Of Patent Date Issued
8607813 Method for reducing the air feed from the atmosphere into the expansion vessel of high-voltage systems filled with insulating liquid and device for carrying out the method Dec. 17, 2013
7591278 Sewer system vent monitor Sep. 22, 2009
7523792 Method and apparatus for shifting speeds in a fluid-actuated motor Apr. 28, 2009
4809537 System and method for monitoring wet bulb temperature in a flue gas stream Mar. 7, 1989
4800914 Gas pressure relief apparatus Jan. 31, 1989
4800596 Ventilated toilet Jan. 31, 1989
4793952 Interface control apparatus Dec. 27, 1988
4773441 Liquid seal vent Sep. 27, 1988
4562724 Gas sampling valve Jan. 7, 1986
4412477 Arrangement to counteract or prevent spreading of fire or smoke Nov. 1, 1983
4411286 Liquid seal valve Oct. 25, 1983
4294165 Arrangement to counteract or prevent spreading of fire or smoke Oct. 13, 1981
4222405 Pressure vacuum breaker Sep. 16, 1980
4199008 Wet sealed standpipe cap Apr. 22, 1980
4022240 Slide valve sealant system May. 10, 1977
3961641 Liquid seal for preventing pneumatic back flow Jun. 8, 1976
3933168 Liquid closure device Jan. 20, 1976











 
 
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