Standard No.:	HG/T 3704-2003
English Name:	General specification for valves lined with fluoroplastics
Chinese Name:	氟塑料衬里阀门通用技术条件
Chinese Classification:	G94    Non-metal chemical machinery equipment
Professional Classification:	HG    Professional Standard - Chemistry
Source Content Issued by:	NDRC
Issued on:	2004-1-9
Implemented on:	2004-5-1
Status:	superseded
Superseded by:	HG/T 3704-2024 General specification for valves lined with fluoroplastics
Superseded on:	2025-5-1
Abolished on:	2025-05-01
Target Language:	English
File Format:	PDF
Word Count:	5500 words
Translation Price(USD):	130.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the product classification, requirements, test methods, inspection rules, marking, packaging, transportation and storage of valves lined with fluoroplastics. This standard is applicable to valves lined with fluoroplastics for flange connection and wafer connection. 2 Normative References The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. GB/T 2828 Sampling Procedures and Tables for Periodic Inspection by Attributes GB/T 9113.1 Integral Steel Pipe Flanges with Flat Face or Raised Face GB/T 12220 General Purpose Industrial Valves — Marking GB/T 12221 Metal Valves for Use in Flanged Pipe Systems — Face-to-face and Centre-to-face Dimensions GB/T 12224 General Requirements for Industrial Steel Valves GB/T 12233 General Purpose Industrial Valves — Casting Iron Globe Valves and Lift Check Valves GB/T 12235 General Purpose Industrial Valves — Flanged Steel Globe Valves and Lift Check Valves GB/T 12236 General Purpose Industrial Valves — Steel Swing Check Valve GB/T 12237 General Purpose Industrial Valves — Flanged and Butt-weld End Steel Ball Valves GB/T 12238 General Purpose Industrial Valve — Flanged and Wafer Butterfly Valves GB/T 12239 General Purpose Industrial Valves — Diaphragm Valves GB/T 12240 General Purpose Industrial Valves — Iron Plug Valves GB/T 13927 Pressure Testing for General Purpose Valves GB/T 15188 Face-to-face, Centre-to-face, End-to-end and Centre-to-end Dimensions of Valves GB/T 17241 Cast Iron Pipe Flanges HG/T 2167 Daiflon HG/T 2902 Polytetrafluoroethylene Molding Powder

Foreword I 1 Scope 2 Normative References 3 Product Classification 3.1 Classification, Designation and Type of Valves 3.2 Lining Materials and Symbols 4 Requirements 4.1 Lining Materials 4.2 Type and Tolerance 4.3 Connecting Type 4.4 Appearance of Fluoroplastics Lining 4.5 Pressure Test 4.6 High Frequency Spark Test 4.7 Vacuum Test 4.8 Assembly 5 Inspection Items and Test Methods 5.1 Lining Materials 5.2 Dimensional tolerance 5.3 Flange dimensions 5.4 Appearance of Fluoroplastics Lining 5.5 Pressure Test 5.6 High Frequency Spark Test 5.7 Vacuum Test 5.8 Assembly 6 Inspection Rules 6.1 Inspection Categories 6.2 Delivery Inspection 6.3 Type Inspection 7 Marking, Packaging, Transportation and Storage Annex A (Normative) Structural Type, Lining Wall Thickness and Face-to-face Dimensions of Valves