F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
F16K 15/14 (2006.01)
Patent
CA 2259831
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 valve also comprises top and base connectors for connecting the valve to the fluid carrying line and a shut-off/flush valve for controlling the flow of fluid through the device. The elastomeric valve member allows the flow of fluid from the supply to the outlet when the fluid pressure at the supply exceeds the pressure at 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. As the elastomeric valve member passes over each step, it engages the step and is thereby prevented from moving downstream. 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. In addition, once the elastomeric valve member is in the second position, it is secured in place and a backflow condition is thereby indicated.
Mcfadden Fincham
Pepsico Inc.
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