GB/T 23337-2023Internal combustion engines—Intake and exhaust valves—Specification (English PDF)

Foreword

This document complies with the regulations of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Custom drafting.

This document replaces GB/T 23337-2009 "Technical Conditions for Intake and Exhaust Valves of Internal Combustion Engines". Compared with GB/T 23337-2009, except In addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) Changed the hardness of the valve base after quenching and tempering treatment (see 4.4.1, 2009 version of 4.4.1);

b) Changed the surface hardness of the chrome-plated valve stem (see 4.6.1, 2009 version of 4.6.1);

c) Changed the requirements for nitriding and nitriding layers of high-temperature alloy valves (see 4.6.2, 2009 version of 4.6.2);

d) Changed the austenite grain size requirements for the metallographic structure of austenitic steel valves (see 4.7.3, 2009 version of 4.7.3);

e) The requirements for the microstructure of high-temperature alloys have been changed (see 4.7.4, 2009 version of 4.7.4);

f) The surface roughness requirements of the conical locking clip groove have been changed (see 4.8.4, 4.8.4 of the 2009 edition);

g) Increased the oblique circular runout tolerance of the stem axis of the nitrided unground valve disc cone surface (see 4.9.2);

h) The disc cone surface roundness tolerance has been changed (see 4.9.3, 4.9.3 of the 2009 version);

i) Added sodium filling requirements and inspection methods for hollow sodium-filled valves (see 4.13 and 5.11);

j) Added requirements and inspection methods for plate forged metal flow lines (see 4.14 and 5.12);

k) Added the coaxiality inspection method between the inner cavity of the hollow sodium-filled valve and the cylindrical surface of the stem (see 5.7.9);

l) Added the coaxiality inspection method of the valve bottom cavity to the cylindrical surface of the stem (see 5.7.10);

m) Increased the chemical composition and mechanical properties of high-temperature alloy Ni30 and cladding alloy P25 (see Table 1 and Table 2).

Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.

This document is proposed by China Machinery Industry Federation.

This document is under the jurisdiction of the National Internal Combustion Engine Standardization Technical Committee (SAC/TC177).

This document was drafted by: Shanghai Motor Vehicle Inspection and Certification Technology Research Center Co., Ltd., Jinan Ward Auto Parts Co., Ltd., Shanghai Overseas Combustion Engine Research Institute Co., Ltd., Huaiji Moon Valve Co., Ltd., Guangxi Yuchai Machinery Co., Ltd., Chongqing Sanai Hailingshi Industry Co., Ltd., Jinhua Star Valve Co., Ltd., Hunan Tianyan Machinery Co., Ltd., Anhui Jinqinglong Machinery Manufacturing Co., Ltd.

Division, Jiangsu Shenyuan Group Co., Ltd., Hengyang Jinzeli Special Alloy Co., Ltd., Pinghu Auto Parts Inspection and Testing Co., Ltd., Beijing Foton Cummins Engine Co., Ltd., Tianjin Internal Combustion Engine Research Institute (Tianjin Motorcycle Technology Center).

The main drafters of this document. Zhao Minghao, Dong Bing, Guo Hua, Luo Huahuan, Su Huailin, Peng Yong, Jiang Ruxing, Xia Caixia, Zuo Yanshang, Tu Yuguo, Zhong Junjie, Zhong Changlin, Xu Jianlu, Gong Yingli, Yan Xicheng.

This document was first published in 2009 and this is the first revision.

Internal combustion engine intake and exhaust valve technical conditions

1 Scope

This document specifies the technical requirements, inspection methods, inspection rules and marking, packaging, transportation and storage of internal combustion engine intake and exhaust valves.

This document applies to the intake and exhaust valves of reciprocating piston internal combustion engines with a cylinder diameter of less than.200 mm.

2 Normative reference documents

GB/T 228.1

GB/T 230.1

GB/T 1804-2000

GB/T 1958

GB/T 2828.1

GB/T 3077

GB/T 4340.1

GB/T 4955

GB/T 4956

GB/T 6394

GB/T 6462

GB/T 6809.2

GB/T 9790

GB/T 11354-2005

GB/T 12773

3 Terms and definitions

The terms and definitions defined in GB/T 6809.2 and QC/T 469-2016 apply to this document.

4 Technical requirements