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GBT24925-2019

Chinese Standard: 'GBT24925-2019'
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GB/T 24925-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.060.99
J 16
Replacing GB/T 24925-2010
Low temperature valve - Technical specifications
低温阀门 技术条件
ISSUED ON: OCTOBER 18, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 4 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions ... 9 
4 Structural style ... 10 
5 Technical requirements ... 19 
5.1 General requirements ... 19 
5.2 Performance ... 20 
5.3 Valve ... 21 
5.4 Bonnet ... 22 
5.5 Stem ... 25 
5.6 Opening-closing parts and valve seats ... 26 
5.7 Packing and stuffing box ... 26 
5.8 Medium flange seal ... 26 
5.9 Operation ... 27 
5.10 Material ... 27 
5.11 Visual quality of steel castings ... 28 
5.12 Defect treatment ... 28 
5.13 Nondestructive testing ... 28 
6 Test methods ... 30 
6.1 Marking inspection ... 30 
6.2 Visual quality of steel castings ... 30 
6.3 Dimensional check ... 30 
6.4 Chemical composition ... 30 
6.5 Mechanical properties ... 30 
6.6 Normal temperature test ... 31 
6.7 Low temperature test ... 31 
6.8 Low temperature cycle life test ... 35 
6.9 Nondestructive testing ... 35 
6.10 Anti-static test ... 36 
7 Inspection rules ... 36 
7.1 Inspection items ... 36 
7.2 Exit-factory inspection ... 36 
7.3 Type test ... 36 
8 Marking ... 37 
9 Painting, packaging, transportation, and storage ... 38 
Appendix A (Informative) Table of recommended materials for low temperature
valve ... 39 
Appendix B (Informative) Schematic diagram of internal cooling cycle ... 41 
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 24925-2010 "Cryogenic valve technical
specifications". Compared with GB/T 24925-2010, in addition to editorial
changes, the main technical changes are as follows:
- ADD the terms cryogenic treatment, drip plate, CWP, internal cooling cycle,
cold box; modify the term "neck elongation" to "bonnet extension" (see
Clause 3; Clause 3 of the 2010 edition).
- In Clause 4, add axial flow check valve, top-mounted fixed ball valve, top-
mounted floating ball valve, top-mounted eccentric butterfly valve; modify
"low temperature worm geared butterfly valve" to "eccentric butterfly valve"
(see Clause 4; Clause 4 of the 2010 edition).
- In 5.1, add the requirements of the valve's pressure-temperature rating,
valve connection type, drip plate, structural length, minimum diameter of
valve seat, valve installation direction, and pressure relief method
identification, etc. (see 5.1; 5.1 of the 2010 edition).
- ADD "Performance"; modify the leakage rate of the sealing test; ADD the
fugitive test of the medium flange and the valve stem, and the low
temperature cycle life test, etc. (see 5.1; Table 2 of the 2010 edition).
- ADD the minimum wall thickness of the valve body and flange requirements
(see 5.1.4 and 5.3.2; 5.2 of the 2010 edition).
- ADD the requirements for minimum elongation of bonnet extension
(including the elongation of bonnet extension of low temperature valve for
cold box and non-cold box), thermal insulation layer, and drip plate (see
5.4.1 and 5.4.5; 5.3 of the 2010 edition).
- ADD stem torque requirements, anti-blowout structure requirements;
modify requirements for dangerous section setting (see 5.5; 5.4 of the 2010
edition).
- Modify "Valve clack" to "Opening-closing parts (valve clack, valve plate, ball)
and valve seats", where the requirements for ball valves and butterfly
valves are added (see 5.6; 5.5 of the 2010 edition).
- Modify "Stuffing box" to "Packing and stuffing box"; ADD requirements for
packing and stuffing box structure (see 5.7; 5.6 of the 2010 edition).
- ADD requirements for medium flange seal (see 5.8).
Low temperature valve - Technical specifications
1 Scope
This Standard specifies the structural style, technical requirements, test
methods, inspection rules, marking, painting, packaging, transportation, and
storage of low temperature valve (hereinafter referred to as "valve").
This Standard is applicable to flange, wafer and welding-connected low
temperature gate valves, globe valves, check valves, ball valves, and butterfly
valves with nominal pressure PN16~PN400, nominal size DN15~DN1200;
pressure class Class150~Class2500, nominal size NPS1/2......
Related standard:   GB/T 38599-2020
   
 
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