1 Scope
This standard specifies structure formation, technical requirements, materials, test methods and inspection rules, marking, painting, packaging and storage/transportation of flanged and wafer resilient seal butterfly valves.
This standard is applicable to: flanged resilient seal butterfly valves with nominal pressure not larger than PN25 and nominal dimension of DN50~DN4000; and wafer resilient seal butterfly valves with nominal pressure not larger than PN16 and nominal dimension of DN50~DN1200.
Where the medium is non-corrosive liquid or gas, the flow rate of the medium in the pipe, when the valve on fully open position, is not larger than 5m/s.
2 Normative References
Provisions of the following documents, through reference in this Standard, constitute provisions of this Standard. For dated reference, subsequent amendments (excluding correction contents) to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to these technical requirements.
