B356-M1979

1. Application and Scope 1.1 Application 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.