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Class Information
Number: 137/215
Name: Fluid handling > Back flow prevention by vacuum breaking (e.g., anti-siphon devices)
Description: Apparatus which stop reverse flow of a liquid in a distribution system by preventing or eliminating the vacuum condition which would cause the reverse flow, such as a condition which would start siphoning.










Sub-classes under this class:

Class Number Class Name Patents
137/216 Air vent in liquid flow line 104


Patents under this class:

Patent Number Title Of Patent Date Issued
8607433 Method of installing an anti-siphon assembly Dec. 17, 2013
8550279 Anti-siphoning fuel device, system, and method Oct. 8, 2013
8240507 Seal-retaining valve for fluid metering device Aug. 14, 2012
7175612 Suction limiting device with variable control Feb. 13, 2007
5639063 Shut-off valve for installation immediatley downstream from a defective valve mounted into the compression-connection type of outlet of the defective valve Jun. 17, 1997
5365969 Float with skirt to prevent leakage due to oversudsing Nov. 22, 1994
5039405 Disconnector for the protection of the watermain, with particular reference to medical plants Aug. 13, 1991
4667925 Quick coupling hose connection with double acting backflow preventing valve May. 26, 1987
4640302 Double disc gate valve Feb. 3, 1987
4558716 Valve body for multiple valve insert packages Dec. 17, 1985
4545735 Diaphragm pump having a valve sheet with inlet and outlet flaps and having antisiphoning capability during pump shutdown Oct. 8, 1985
4480656 Plumbing fixture Nov. 6, 1984
4321219 Steam cleaner Mar. 23, 1982
4286616 Non-freeze wall hydrant Sep. 1, 1981
4090527 Backflow preventer and relief valve assembly May. 23, 1978
4044787 Backflow preventer and relief valve assembly Aug. 30, 1977
3996962 Backflow preventer and relief valve assembly Dec. 14, 1976
3930516 Ballcock assembly Jan. 6, 1976











 
 
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