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GB/T 21385-2025Metal-seated ball valves (English PDF)

金属密封球阀

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 31, 2025

Implementation date

May 1, 2026

Scope

GB/T 21385-2025 is the English-translated version of 金属密封球阀.

GB/T 21385-2025 is the Chinese standard "Metal-seated ball valves". Its scope clause reads: This document specifies the structural types, technical requirements, materials, test methods, inspection rules, markings and nameplates, and anti-corrosion features of metal-sealed ball valves.

Protection, packaging, storage and transportation. This document applies to nominal sizes DN15~DN800 and nominal pressures PN16~PN400, and nominal sizes NPS1/~NPS32 and...

Nominal pressure Class 150~Class 2500, applicable temperature -29°C~550°C, applicable media include gas, liquid, gas-solid, gas-liquid, and solid-liquid mixtures.

Design, production and inspection of flanged, welded or threaded metal-sealed ball valves for gas-solid-liquid multiphase flow.

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Document preview — GB/T 21385-2025

National Standard of the People's Republic of China

ICS: 23.060.10
Classification: J 16
Replacing: GB/T 21385-2008

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Structural Type
5 Technical Requirements
6.Materials 7.
7.Test Methods 8.
8 Inspection Rules
9.Signs and nameplates
10 Protection, Packaging, Storage and Transport
11 Supply Requirements
Appendix A (Informative) Metal-Sealed Ball Valve Ordering Contract Data Sheet

1 Scope

This document specifies the structural types, technical requirements, materials, test methods, inspection rules, markings and nameplates, and anti-corrosion features of metal-sealed ball valves.

Protection, packaging, storage and transportation.

This document applies to nominal sizes DN15~DN800 and nominal pressures PN16~PN400, and nominal sizes NPS1/~NPS32 and...

Nominal pressure Class 150~Class 2500, applicable temperature -29°C~550°C, applicable media include gas, liquid, gas-solid, gas-liquid, and solid-liquid mixtures.

Design, production and inspection of flanged, welded or threaded metal-sealed ball valves for gas-solid-liquid multiphase flow.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 70.1 Socket head cap screws

GB/T 196 Basic Dimensions of Ordinary Threads

GB/T 197 Tolerances for Standard Threads

GB/T 228.1 Metallic materials - Tensile testing - Part 1.Test method at room temperature

GB/T 897 Double-ended studs bm=1d

GB/T 898 Double-ended studs bm=1.25d

GB/T 901 Equal Length Double-Ended Studs, Class B

GB/T 4622 (all parts) Spiral wound gaskets for pipe flanges

GB/T 5782 Hex head bolts

GB/T 5783 Hex head bolts with full thread

GB/T 6175 Type 2 Hex Nut

GB/T 7306 (all parts) 55° Sealing Pipe Thread

GB/T 9124 (all parts) Steel pipe flanges

GB/T 9128 (all parts) Metal ring gaskets for steel pipe flanges

GB/T 12220 Industrial Valve Marking

GB/T 12221 Structural Length of Metal Valves

GB/T 12223 Connection of Partial Rotary Valve Actuators

GB/T 12224 General requirements for steel valves

GB/T 12228 Technical Specification for Carbon Steel Forgings of General Valves

GB/T 12229 Technical Specification for Carbon Steel Castings of General Valves

GB/T 12230 Technical Requirements for Stainless Steel Castings for General Valves

GB/T 12716 60° Sealing Pipe Thread

GB/T 13927 Pressure Testing of Industrial Valves

GB/T 21384 | GB/T 24921.2 | GB/T 24921.1 | GB/T 21387 | […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 14 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 4622 · GB/T 7306 · GB/T 9124

Cited by

Editions of GB/T 21385

Edition	Title	Revision	Status
GB/T 21385-2025	Metal-seated ball valve	current edition	Current
GB/T 21385-2008	Metal-seated ball valve	previous edition	In force

This page sells the current edition, GB/T 21385-2025. Earlier editions are listed for reference only.

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