An additional function is the maximum pressure protection. Moreover, these spool valves are available in direct acting or pilot-operated design.

backflowprevention valve - bunnings

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Ames backflow2000SS

Series 009 Reduced Pressure Zone Assemblies are designed to protect potable water supplies in accordance with national plumbing codes and water authority requirements. This series is designed to protect drinking water supplies from dangerous cross-connections in accordance with national plumbing codes and water authority requirements for non-potable service applications such as irrigation, fire line, or industrial processing. This series features two in-line, independent check valves, captured springs and replaceable check seats with an intermediate relief valve. Its compact modular design facilitates easy maintenance and assembly access. Sizes 1⁄4 – 1 inch shutoffs have tee handles. Assembly meets AS/NZS 2845.1 Standards.