This Malaysian Standard specifies requirements for the design, materials, dimensions and performance of piston type side entry float operated valves (copper alloy-body) (here in afterball float valve) of: a) Type I - Ball float valve for light duty of nominal size DN 15 (? inch), DN 20 (? inch) andDN 25 (1 inch) as illustrated in Figure 1; and b) Type lI - Ball float valve for heavy duty of nominal size DN 15 (? inch), DN 20 (? inch)and DN 25 (1 inch) as illustrated in Figure 2 intended for use with floats complying with BS 1968 and BS 2456. This standard applies to all Type I and Type II piston type float operated valves suitable for operation at PN 10 and PN 16 respectively.