1 Scope
Design, material, structure, performance, test & inspection, marking & lead sealing and delivery of spring loaded safety valves are specified in this standard.
This standard is applicable to steam boiler, pressure vessel and pipe safety valves whose set pressures are 0.1MPa~42.0MPa and flow diameters are greater than or equal to 8mm.
2 Normative references
Clauses of the following documents are quoted into this standard. As for all dated references, all subsequent modification sheets (excluding correcting contents) or revised editions are not applicable to this standard. However, each side of this standard is encouraged to research if the latest editions of these references can be applied. As for all undated references, their latest editions are applicable to this standard.
GB/T 1239.2 Cold coiled helical compressions springs - Technical specifications
GB/T 1239.4 Hot coiled helical springs - Technical specifications
GB/T 1239.6 Design of helical springs
GB/T 9440 Malleable iron castings
GB/T 12220 General purpose industrial valves-Marking (GB/T 12220-1989, idt IS0 5209: 1977)
GB/T 12224 General requirements for industrial steel valves
GB/T 12225 General purpose industrial valves - Specification of copper alloy castings
GB/T 12227 General purpose industrial valves - Specification of spheroidal graphite iron castings
GB/T 12228 General purpose industrial valves - Specifications of carbon steel forgings
GB/T 12229 General purpose industrial valves - Specification of carbon steel castings
GB/T 12230 General purpose industrial valves - Specifications of austenitic steel castings
GB/T 122 41 Safety valve - General requirements (GB/T 12241-2005, IS0 4126-1:1991, MOD)
GB/T 12242 Performance test code - Pressure relief devices
JB/T 7928 General purpose industrial valves - Delivery specification
3 Terms and definition
Terms and definition in GB/T 12241 are applicable to this standard.
4 Design, material and structure
GB/T 12243-2005 The following standards are cited：
