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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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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