Backflow valve

Details Backflow valve Backflow valve

1992-02-13

1993-01-05

Rivell, John

Fluid handling

With indicator, register, recorder, alarm or inspection means

Inspection means

137846, 137550, 116273, F16K 3700, F16K 1514

Patent

active

051761734

ABSTRACT:
A backflow valve for use in a post-mix carbonator system for preventing the backflow of carbonated fluid, thereby preventing the contamination of the fresh water supply, and indicating when such a backflow condition has occurred. In a first embodiment the valve comprises a check seat body which houses an elastomeric valve member, and a sight glass body for viewing the position of the elastomeric valve member. The elastomeric valve member allows normal the flow of fluid from the supply to the outlet and prevents the reverse flow of fluid when the pressure at the outlet exceeds the pressure at the supply. As the pressure downstream increases, the elastomeric valve member is forced in the upstream direction over a plurality of steps in the check seat body. The position of the elastomeric valve member may be observed through a sight glass body which has a line marking the normal position of the elastomeric valve member. In a second embodiment the elastomeric valve member is slidably disposed within a retaining chamber that is positioned between the upstream and downstream portions of the valve. Under normal operating conditions, the elastomeric valve member is in a normal first position allowing fluid flow therethrough; however, in a backflow condition, the elastomeric valve member slides into a second position within the retaining chamber and fluid flow is restricted, and a backflow condition is thereby indicated.

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