Freeze Resistant Sanitary Yard Hydrants with Backflow Protection

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The purpose of freeze resistant sanitary yard hydrants is to supply potable water without danger of damaging the device due to freezing, to provide protection of the potable water supply from contamination due to ground water, and to prevent backflow in accordance with the backflow prevention device selected. These devices shall only be used on systems where the low-head backpressure does not exceed that generated by an elevated hose equal to or less than 10.0 feet (3.0 m) in height. This device shall not be subjected to continuous pressure for more than 12 hours. The freeze resistant sanitary yard hydrants shall comply with ASSE Standard # 1057.The freeze resistant sanitary yard hydrant with backflow protection has five design types.

Type 1 devices shall consist of two independent check, force loaded or biased to a closed position, with an atmospheric vent located between the two check valves which is force loaded or biased to an open position and a means for attaching a hose. When the hose is attached the Type 1 device shall be freeze resistant.

Type 2 devices shall consist of two independent check, force loaded or biased to a closed position, with an atmospheric vent located between the two check valves which is force loaded or biased to an open position and a means for attaching a hose. When the hose is removed the Type 2 device shall be freeze resistant.

Type 3 devices shall consist of one check, force loaded or biased to a closed position, with an atmospheric vent which is force loaded or biased to an open position and a means for attaching a hose. When the hose is attached the Type 3 device shall be freeze resistant.

Type 4 devices shall consist of one check, force loaded or biased to a closed position, with an atmospheric vent which is force loaded or biased to an open position and a means for attaching a hose. When the hose is removed the Type 3 device shall be freeze resistant.

Type 5 devices shall consist of a removable mechanical backflow protection device with at least one check, force loaded or biased to a closed position and an atmospheric vent which is loaded or biased to an open position and a means for attaching a hose. When the hose and backflow protection device is removed, the Type 5 device shall be freeze resistant and shall not allow a hose to be attached.