Requirements for nominal size $9H compact float operated valves, of reducing flow type incorporating a float and renewable seat or no less effective assembly for use at operation pressures between 0.1 and 14 bar.
BS 1212-4:1991 history
2016BS 1212-4:2016 Float operated valves. Specification for compact type float operated valves for WC flushing cisterns (including floats)
1991BS 1212-4:1991 Float operated valves - Specification for compact type float operated valves for WC flushing cisterns (including floats)