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GB/T 12227-2025: General purpose industrial valves - Technical specification for ductile iron castings
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 12227-2025	English	279	Add to Cart	3 days [Need to translate]	General purpose industrial valves - Technical specification for ductile iron castings
GB/T 12227-2005	English	159	Add to Cart	3 days [Need to translate]	General purpose industrial valve -- Specification of spheroidal graphite iron castings
GB/T 12227-1989	English	199	Add to Cart	2 days [Need to translate]	General purpose industrial valves. Specification of spheroidal graphite iron castings

GB/T 12227-2025: General purpose industrial valves - Technical specification for ductile iron castings

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ICS 23.060.01 CCSJ16 National Standards of the People's Republic of China Replaces GB/T 12227-2005 Technical Specifications for Ductile Iron Valves Published on 2025-10-31 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III 1.Scope 1 2 Normative References 1 3.Terms and Definitions 1 4.Technical Requirements 1 4.1 Geometric shape and dimensional tolerances 1 4.2 Machining allowance 2 4.3 Weight Deviation 2 4.4 Chemical composition 2 4.5 Mechanical Properties 2 4.6 Pressure Test 3 4.7 Metallographic Examination 3 4.8 Surface Quality 3 4.9 Defects and Repairs of Castings 3 4.10 Stress Relief Treatment 3 5.Test Methods 3 5.1 Geometric shape and dimensional tolerances 3 5.2 Machining allowance 3 5.3 Weight Deviation 4 5.4 Chemical composition 4 5.5 Mechanical Properties 4 5.6 Pressure Test 4 5.7 Metallographic Examination 4 5.8 Surface Quality 4 6.Inspection Rules 4 6.1 Inspection Classification 4 6.2 Factory Inspection 4 6.3 Type Testing 5 6.4 Batching, Sampling Methods, and Judgment Rules 5 7.Marks, labels, and accompanying documents 5. 7.1 Contents of the logo 5 7.2 Tag 6 7.3 Accompanying Documents 6 8 Packaging, transportation and storage 6 8.1 Packaging 6 8.2 Transportation 6 8.3 Storage 6 Table 1 Tensile properties of ductile iron specimens 2 Table 2.Minimum impact absorbed energy of V-notch specimens machined on ductile iron samples. Table 3.Inspection Items 4 Table 4.Sampling Quantity Table 5

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document replaces GB/T 12227-2005 "Technical Conditions for General-Purpose Ductile Iron Valves". Compared with GB/T 12227-2005, Apart from structural adjustments and editorial changes, the main technical changes are as follows. a) The scope has been changed (see Chapter 1, Chapter 1 of the.2005 edition); b) The terms "ferritic pearlitic ductile iron" and "side-by-side test block" and their definitions have been added (see 3.1 and 3.2); c) The terms "casting process" and "quality requirements" and their definitions have been removed (see 3.1 and 3.4 of the.2005 edition); d) Requirements for "geometric shape and dimensional tolerances, machining allowances, and weight deviations" have been added (see 4.1~4.3); e) The requirements for tensile properties and minimum impact energy absorption have been changed (see Tables 1 and 2,.2005 editions); f) The requirements for "mechanical properties of cast specimens" and "impact values of cast notched specimens" have been removed (see Tables 3 and 4 in the.2005 edition); g) A "stress test" requirement has been added (see 4.6); h) The requirements for “metallographic examination” have been changed (see 4.7, 3.5 of the.2005 edition); i) Requirements for "surface quality, defects and repairs in castings, and stress relief treatment" have been added (see 4.8~4.10); j) Added tests for "geometric shape and dimensional tolerances, machining allowances, weight deviations, chemical composition, metallographic inspection, and surface quality". Methods (see 5.1–5.4, 5.7, 5.8); k) Added requirements for "inspection classification, factory inspection, type testing, batching, sampling methods, and judgment rules" (see 6.1~6.4); l) The requirements for "inspection by the foundry (workshop)" and "inspection by the buyer" have been removed (see 5.1 and 5.2 of the.2005 edition); m) Added requirements for "logos, labels, and accompanying documents" (see Chapter 7); n) The requirements for “packaging, transport and storage” have been changed (see Chapter 8, Chapter 6 of the.2005 edition). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee on Valve Standardization (SAC/TC188). This document was drafted by. Yuanda Valve Group Co., Ltd., Anhui Baihu Valve Factory Co., Ltd., and Zhongfa Holding (Group) Co., Ltd. The company, Anhui Hongxing Valve Co., Ltd., CNNC Suzhou Valve Technology Industry Co., Ltd., Hangzhou Chunjiang Valve Co., Ltd., and Shanghai Guanlong Valve. Energy-saving equipment company, Shanghai Biaoyi Valve Co., Ltd., Anhui Tongdu Fluid Technology Co., Ltd., and Bonasway Valve Co., Ltd. Limited Liability Company, Shanghai Hang Technology Group Co., Ltd., Hefei Tong'an Engineering Machinery Equipment Supervision Co., Ltd., Jiangsu Tenglong Petrochemical Machinery Co., Ltd. Chengdu Chuanli Intelligent Fluid Equipment Co., Ltd., Zhejiang Hualong Jushui Technology Co., Ltd., Shandong Tianli Machinery Casting Co., Ltd. Shandong Yibaitong Valve Co., Ltd., Wenzhou Technician College, Yongkang Liangong Valve Co., Ltd., and Tianjin Tanggu Watts Valve Co., Ltd. The main drafters of this document are. Shao Jiannong, Feng Yuzhu, Huang Jie, Chen Chunjian, Yan Jie, Zhu Wenbin, Chai Lu, Zhang Yan, Huang Zhimin, Wang Jing, and Wang Ronghui. Chen Wengong, Zhou Qinkai, Dai Yiming, Zhang Wei, Ge Bing, Yang Zhisen, Lü Guoqin, Su Zhiping, Lin Fan, Wang Zhanbo. This document was first published in 1989, revised for the first time in.2005, and this is the second revision. Technical Specifications for Ductile Iron Valves

1 Scope

This document specifies the technical requirements, test methods, inspection rules, marking and labeling, and accompanying documents for general-purpose ductile iron valve parts. For loading, transportation and storage. This document applies to the design, production, and inspection of ferritic pearlitic ductile iron (hereinafter referred to as "ductile iron") for general-purpose valves.

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 191 Pictorial Symbols for Packaging and Storage GB/T 228.1 Metallic materials – Tensile testing – Part 1.Test method at room temperature GB/T 229 Metallic materials Charpy impact test method GB/T 1348 Ductile Iron Castings GB/T 5611 Casting Terminology GB/T 6414 Dimensional tolerances, geometric tolerances and machining allowances for castings GB/T 9441 Metallographic Examination of Ductile Iron GB/T 9441-2021 Metallographic Examination of Ductile Iron GB/T 11351 Weight tolerance of castings GB/T 12220 Industrial Valve Marking GB/T 13927 Pressure Testing of Industrial Valves

3 Terms and Definitions

The terms and definitions defined in GB/T 5611 and the following terms and definitions apply to this document. 3.1 Ductile cast iron containing a ferrite or pearlite matrix or a mixture of ferrite and pearlite. 3.2 Side-by-side cast sample The specimen is cast using the same gating system as the casting and is cast side by side with the casting. 4.Technical Requirements 4.1 Geometric shape and dimensional tolerances The geometry and dimensions of the castings shall conform to the specifications in the drawings. Dimensional tolerances of the castings shall conform to the requirements of GB/T 6414; special tolerances may apply. Alternatively, it can be executed according to the buyer's drawings and technical requirements. ...