IS 10989 : 1984 Specification for Cast or Forged Steel Check Valves (Flanged or Butt Welding Ends) for Petroleum, Petrochemicals, Chemicals and Allied Industries

1 Scope

Specifies the requirements for cast or forged steel check valveswith flanged or buttwelding ends.

1.1 It covers the valves in nominal sizes from 15 mm to 600 mmas specified in IS 9520 : 1980 `Nominal sizes for valves' and classdesignations:

150, 300, 600, 900, 1500 and 2500

1.2 For each class and type, the range of sizes covered by thisstandard is shown in Table 1.