GB/T 12225-2018General purpose industrial valves - Specification of copper alloy castings (English PDF)

Foreword

This Standard is drafted in accordance with stipulations in GB/T 1.1-2009. This Standard serves as a replacement of GB/T 12225-2005 General Purpose Industrial Valves - Specification of Copper Alloy Castings. In comparison with GB/T 12225-2005, there are several main technical changes as follows:

---Copper alloy nameplates ZCuZn31Al2 and ZCuAl9Fe4Ni4Mn2 are added;

---In mechanical properties, Brinell hardness complies with a new method of representation;

---The illustration of sample for tensile test is modified in accordance with GB/T 228.1;

---The marking of castings is modified in accordance with GB/T 12220. This Standard was proposed by China Machinery Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee (188) on Valves of Standardization Administration of China (SAC/TC 188). The responsible drafting organizations of this Standard. Hefei General Machinery Research Institute, Ningbo AMICO Copper Valves Manufacturing INC., Zhejiang WANDEKAI Fluid Equipment Science and Technology Co., Ltd., Zhejiang DunAn Valve Applications Co., Ltd., KAIRUITE Valve Co., Ltd. The participating drafting organizations of this Standard. Taizhou DUOHE Machinery Co., Ltd., YORHE Fluid Intelligent Control Co., Ltd., Zhejiang SUMING Valves Co., Ltd., Zhejiang VALOGIN Technology Co., Ltd., Taizhou NENG SHI HVAC Technology Co., Ltd., Yuhuan Xiuhui Valves Co., Ltd., Boteli Valve Group, Hefei Tongyong Environmental Control Technology Limited Liabiity Company. The main drafters of this Standard. Zhang Jiwei, Zheng Xuezhen, Zhazhao, Ding Chunlan, Li Yunlong, Yao Shengyong, Su Zongyao, Zhang Yinzong, Chen Weifeng, Liu Wenxiu, Jin Keyu, Hu Chunyan. The release of previous versions of the standard replaced by this Standard is as follows:

---GB/T 12225-1989, GB/T 12225-2005. General Purpose Industrial Valves - Specification of Copper Alloy Castings

1 Scope

GB/T 12225-2018 is the Chinese national standard on general purpose industrial valves - specification of copper alloy castings, in the field of fluid systems and general-purpose components. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 14 May 2018 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 December 2018. Classification: ICS 23.060.01, CCS J16. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Standard specifies the classification, nameplate, marking method and code, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of copper alloy castings. This Standard is applicable to valves of sand casting and metal casting (non-pressure casting) and copper alloy castings of pipe fittings (hereinafter referred to as castings).

2 Normative References

The following documents are indispensable to the application of this Standard. In terms of references with a specified date, only versions with a specified date are applicable to this Standard. The latest version (including all the modifications) of references without a specified date is also applicable to this Standard.

GB/T 228.1 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room Temperature

GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1. Test Method

GB/T 1176 Casting Copper and Copper Alloys

GB/T 6414 Castings - Dimensional Tolerances and Geometrical Tolerances and Machining Allowances

GB/T 11351 Mass Tolerances of Casting

GB/T 13927 Pressure Testing for General Purpose Valves

3 Casting Classification

Castings shall be divided into four grades. Please refer to Table 1 for the grade classification and assessment requirement. Table 1 -- Casting Assessment Requirement Casting Grade Assessment Requirement I Chemical composition, mechanical properties II Mechanical properties welding or other methods. However, they shall comply with the drawings or the stipulation in the contract of ordering. The pressure-containing parts shall satisfy the test requirement of the shell body.

7 Marking, Packaging, Transportation and Storage

7.1 Pressure-containing castings, such as valve body and bonnet, shall cast out nominal dimension (DN) or (NPS), nominal pressure (PN) or pressure class (Class), manufacturer's name or trademark, material code number and furnace (batch) number. When it is difficult to cast out the marks, it is allowable to adopt the method of embossing for marking. At least the nominal dimension, nominal pressure, and the manufacturer's name or trademark shall be marked, or as stipulated in the contract of ordering.