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This Standard applies to devices that automatically reduce the initial supply pressure to a set lower pressure in domestic water systems. It applies to devices in the size range 1/2-2 inches inclusive that are of the direct acting diaphragm type with a means for adjusting the pressure setting, and are suitable for use over a hydrostatic inlet pressure range up to 1700 kPa and a water temperature range up to 82°C.
1.2 Scope
This Standard covers material specifications, construction requirements, and tests for structural integrity, capacity and reduced pressure deviations, and instructions and marking.
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