Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Type test
4.1 Test conditions
4.2 Test procedures
5 Performance classes
5.1 Classification criteria
5.2 Tightness classes
5.3 Endurance classes
5.4 Temperature classes
5.5 Example of class designation
5.6 Marking
6 Reporting
7 Extension of qualification to untested valves
Annex A (normative) Total leak rate measurement
A.1 Vacuum method (helium only)
A.2 Flushing method (helium or methane)
Annex B (normative) Leak measurement using the sniffing method
B.1 Use of helium as test fluid
B.2 Methane as test fluid
Annex C (informative) Derivation and graphs relating the stem
diameter to leak rate
C.1 Stem seal helium leakage rate comparison for fugitive
emission testing in helium
C.2 Stem seal methane leakage rate comparison for fugitive
emission testing in methane
Bibliography