This standard specifies the terms and definitions, structural types, parameters, models, technical requirements, test methods, inspection rules, marking, painting and supply requirements of emergency shutoff valve for LG equipment (hereinafter referred to as shutoff valve).
This standard is applicable to emergency shutoff valve for LG equipment, of which, the nominal pressure is PN10~PN25, the nominal dimension is DN15~DN350, the working temperature is not greater than 50℃, the applicable media are LPG, liquid ammonia, liquid chlorine, liquid sulfur dioxide, propylene, propane, butane, butadiene and their mixture.
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 (excluding corrections), or revisions, of any of these publications do not apply to this standard. 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 699 Quality Carbon Structural Steels
GB/T 1047 Pipework Components--Definition and Selection of DN (Nominal Size) (GB/T 1047-2005, ISO 6708: 1995, MOD)
GB/T 1048 Pipework Components - Definition and Selection of PN (GB/T 1048-2005, ISO/CD 7268: 1996, MOD)
JB 4727 Low-alloy Steel Forgings for Low Temperature Pressure Vessels
JB 4728 Stainless Steel Forgings for Pressure Vessels
JB/T 7248 Technical Specification for Low Temperature Service Steel Casting for Valves
JB/T 7928 General Purpose Industrial Valve - Delivery Specification
3 Terms and Definitions
Foreword i 1 Scope 2 Normative References 3 Terms and Definitions 4 Structural Types, Parameters and Models 4.1 Structural Types 4.2 Parameters 4.3 Models 5 Technical Requirements 5.1 Maximum Working Pressure 5.2 Structural Length 5.3 Appearance 5.4 Valve Body 5.5 Spring 5.6 Hydraulic and Pneumatic Elements 5.7 Auto-shutoff Equipment of Fusible Element 5.8 Performance Requirements 5.9 Material 6 Test Methods 6.1 Shell Test 6.2 Air-tightness Test 6.3 Excess Flow Performance Test 6.4 Emergency Shutoff Performance Test 6.5 Natural Closing Test 6.6 Vibration Test 6.7 Repeated Operation Test 6.8 Fusible Element Fusion Test 6.9 Hydraulic and Pneumatic Element Tests 7 Inspection Rules 7.1 End-of-manufacturing Test 7.2 Type Test 7.3 Sampling Method 8 Marking 8.1 Marking Contents 8.2 Designation on Valve Body 8.3 Mark on Nameplate 9 Painting 10 Supply Requirements Annex A (Normative) Vibration-resistance Performance Test Method of Emergency Shutoff Valve Annex B (Informative) Order Contract Data Sheet for Emergency Shutoff Valve for LG Equipment
