General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 778.4-2018
Scope
This part of GB/T 778 specifies the technical characteristic requirements for drinking cold water meters and hot water meters that measure the volume of cold water and hot water in closed full pipes and are equipped with cumulative flow indicating devices. This part applies to the following types of water meters: a) Maximum allowable pressure (MAP) is greater than or equal to 1 MPa (0.6 MPa for water meters with pipe nominal diameter DN≥500 mm); b) Drinking water meters with maximum allowable temperature (MAT) of 30 °C Cold water meters; c) Hot water meters with a maximum allowable temperature (MAT) of up to 180 °C by grade. This standard applies both to water meters based on the mechanical principle and to water meters based on the electrical or electronic principle and with electronic devices based on the mechanical principle for measuring the volume flow of cold and hot water for drinking. This section also applies to electronic auxiliary devices. Usually electronic auxiliaries are optional, but national or international regulations may determine that certain auxiliaries are mandatory depending on the usage of the water meter.