Standard No.:	GB/T 28776-2012
English Name:	Steel gate, globe and check valve for the petroleum and natural gas industries (for sizes DN100 and smaller)
Chinese Name:	石油和天然气工业用钢制闸阀、截止阀和止回阀（≤DN100）
Chinese Classification:	J16    Valve
Professional Classification:	GB    National Standard
ICS Classification:	23.060.99 23.060.99    Other valves 23.060.99
Issued by:	AQSIQ,SAC
Issued on:	2012-11-5
Implemented on:	2013-3-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	13000 words
Price(USD):	390.0
Delivery:	via email in 1 business day

Steel Gate, Globe and Check Valve for the Petroleum and Natural Gas Industries (for Sizes DN100 and Smaller) 1 Scope This standard specifies the structural types, specifications, materials, test methods and inspection rules, marking, packaging, storage and transportation requirements for steel gate valves, globe valves (including throttle valves) and check valves (hereinafter referred to as "valves") of nominal sizes not larger than DN100 for petroleum and natural gas industry applications. This standard is applicable to flanged end valves of nominal pressure PN20, PN50, PN100, PN250, and of nominal sizes DN8 to DN100. This standard is applicable to socket welding and threaded end compact valves of nominal pressure PN140, PN250, and of nominal sizes DN8 to DN65. This standard is applicable to butt-welding end valves of nominal pressure PN20 to PN250, and of nominal sizes DN8 to DN100. This standard is applicable to gate and globe valves valves of bellows stem seal construction. Note: Nominal pressure PN20 is equivalent to Class150, nominal pressure PN50 is equivalent to Class300, nominal pressure PN100 is equivalent to Class600, nominal pressure PN140 is equivalent to Class800, and nominal pressure PN250 is equivalent to Class1500. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB 150 Steel Pressure Vessels GB/T 196 General Purpose Metric Screw Threads — Basic Profile (GB/T 196-2003, ISO 724:1993, MOD) GB/T 197 General Purpose Metric Screw Threads — Tolerances (GB/T 197-2003, ISO 965-1:1998, MOD) GB/T 228.1 Metallic Materials — Tensile Testing — Part 1: Method of Test at Room Temperature (GB/T 228.1-2010, ISO 6892-1:2009, MOD) GB/T 898 Double End Studs bm = 1.25d GB/T 1220 Stainless Steel Bars GB/T 1221 Heat-resistant Steel Bars GB/T 3077 Alloy Structure Steels GB/T 5796.1 Trapezoidal Screw Threads — Part 1: Profiles (GB/T 5796.1-2005, ISO 2901, 1993, MOD) GB/T 5796.2 Trapezoidal Screw Threads — Part 2: General Plan (GB/T 5796.2-2005, ISO 2902:1977, MOD) GB/T 5796.3 Trapezoidal Screw Threads — Part 3: Basic Dimensions (GB/T 5796.3-2005, ISO 2904:1977, MOD) GB/T 5796.4 Trapezoidal Screw Threads — Part 4: Tolerances (GB/T 5796.4-2005, ISO 2903:1993, MOD) GB/T 7306.2 Pipe Threads with 55 Degree Thread Angle Where Pressure-tight Joints are Made on the Threads — Part 2: Taper Internal and External Threads (GB 7306.2-2000, eqv ISO 7-1:1994) GB/T 9113 Integral Steel Pipe Flanges GB/T 12220 General Purpose Industrial Valves — Marking (GB/T 12220-1989, idt ISO 5209:1977) GB/T 12221 Metal Valves — Face to Face, End to End, Center to Face and Center to End Dimensions (GB/T 12221-2005, ISO 5752:1982, MOD) GB/T 12224 General Requirements for Industrial Steel Valves GB/T 12228 General Purpose Industrial Valves — Specification of Carbon Steel Forgings GB/T 12229 General Purpose Industrial Valves — Specification of Carbon Steel Castings GB/T 12230 General Purpose Industrial Valves — Specification of Stainless Steel Castings GB/T 12716 Pipe Threads with the Thread Angle of 60 Degrees Where Pressure-tight Joints are Made on Threads GB/T 26480 Valve Inspection and Testing JB/T 5300 General Purpose Industrial Valves Material — Selection Guideline JB/T 8858 Gate Valve — Potential Pressure Life Test Regulation JB/T 8859 Globe Valve — Potential Pressure Life Test Regulation ASME 1.5 ACME Screw Threads ASME 1.5 Stub ACME Screw Threads 3 Structural Form

Foreword II 1 Scope 2 Normative References 3 Structural Form 4 Specifications 4.1 Pressure-temperature rating 4.2 Temperature constraints 4.3 Valve structure 4.4 Flow passageway of valve body 4.5 Wall thickness of valve shell 4.6 Connecting end of valve 4.7 Structure length 4.8 Valve seats 4.9 Valve body and bonnet 4.10 Obturator 4.11 Valve stem 4.12 Stem nut or stem bushing 4.13 Packing, packing chamber and gland 4.14 Packing retention 4.15 Hand wheel 5 Material 6 Test Methods and Inspection Rules 6.1 Test methods 6.2 Inspection rules 7 Marking 8 Packaging, Storage and Transportation Annex A (Normative) Pressure-temperature Ratings for PN250 Valves Annex B (Normative) Requirements for Valves with Bellows Stem Seals Annex C (Informative) Dimensions of Butt Welding End