BS 2456:1990

This standard BS 2456:1990 Specification for floats (plastics) for float operated valves for cold water services is classified in these ICS categories:

• 91.140.60 Water supply systems

This British Standard specifies requirements for two grades of float, with or without boss inserts. Grade C for use in cold water cisterns only, where they may be exposed to temperatures not exceeding 38 °C. Grade H for use in cold water cisterns or systems that may subject the float to hot water not exceeding 93 °C for a limited period, e.g. from a vent pipe arrangement in a feed and expansion cistern. The standard specifies plastics spherical floats of 102 mm, 114 mm, 127 mm and 152 mm diameter, and non-spherical floats having equivalent lifting efforts, suitable for attachment to the float operated valves specified in BS 1212-1, BS 1212-2 and BS 1212-3, except when otherwise specified by the purchaser in accordance with Appendix A of this standard.

Appendix A lists the information to be provided by the purchaser at the time of enquiry or order.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.

Requirements for two grades of plastic floats specified in BS 1212.