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GB/T 8464-2023 English PDF
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GB/T 8464: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 8464-2023 | English | 395 |
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Cast iron, copper and stainless steel valves with screwed connections
| Valid |
| GB/T 8464-2008 | English | 85 |
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Cast iron and copper valves with screwed connections
| Obsolete |
| GB/T 8464-1998 | English | 719 |
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5 days
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Valves with female screw ends for water-heating system
| Obsolete |
| GB/T 8464-1987 | English | RFQ |
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3 days
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General technical requirements for gate, stop, globe and check valves with female screw connection
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 8464-2023
GB/T 8464-2023: Cast iron, copper and stainless steel valves with screwed connections
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT8464-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.060.01
CCS J 16
Replacing GB/T 8464-2008
Cast iron, copper and stainless steel valves with screwed
connections
Issued on: MARCH 17, 2023
Implemented on: OCTOBER 01, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 8
4 Structure type... 8
5 Materials... 15
6 Technical requirements... 17
6.1 Pressure-temperature rating... 17
6.2 Structure length... 17
6.3 Connection end... 17
6.4 Minimum flow diameter... 17
6.5 Minimum wall thickness of valve body... 18
6.6 Valve cover... 19
6.7 Wrench... 19
6.8 Gate... 20
6.9 Valve seat... 20
6.10 Valve disc... 20
6.11 Valve stem... 20
6.12 Ball... 21
6.13 Assembly... 21
6.14 Operation... 22
6.15 Appearance... 22
6.16 Shell strength... 22
6.17 Sealing performance... 22
6.18 Leaching of metallic contaminants... 23
6.19 Torsional performance... 23
6.20 Bending resistance... 23
7 Test methods... 24
7.1 Structure length... 24
Cast iron, copper and stainless steel valves with screwed
connections
1 Scope
This document specifies the structure types, materials, technical requirements, test
methods, inspection rules, marking, packaging, transportation, and storage of cast iron,
copper, and stainless steel gate valves, globe valves, ball valves, and check valves with
screwed connections.
This document applies to.
Gray cast iron valves with a nominal pressure not exceeding PN16 and a nominal size
not exceeding DN100.
Malleable cast iron valves and ductile cast iron valves with a nominal pressure not
exceeding PN25 and a nominal size not exceeding DN100.
Copper alloy valves and stainless steel valves with a nominal pressure not exceeding
PN40 and a nominal size not exceeding DN100.
The operating temperature is not higher than 180 ℃, and the working medium is water,
non-corrosive liquid, air, saturated steam, etc.
Note 1.The valves in this document refer to gate valves, globe valves, ball valves, or
check valves with screwed connections.
Note 2.For valves with a nominal size greater than or equal to DN50, the working
medium does not include air or saturated steam.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
GB/T 700, Carbon structural steels
GB/T 1176, Casting copper and copper alloys
GB/T 1184-1996, Geometrical tolerancing - Geometrical tolerance for features
without individual tolerance indications
GB/T 17241.7, Specifications for cast iron pipe flanges
GB/T 29528, Specification of copper alloy forgings for valves
GB/T 35741, Specification of stainless steel forgings for industrial valves
QB/T 5257, Polytetrafluoroethylene (PTFE) sheet
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
wrench
The part where the installation tool contacts the threaded head of the valve pipe when
clamping the valve to the pipeline.
4 Structure type
4.1 A typical structure of the gate valve with screwed connections is shown in Figure 1.
5.2 The technical requirements for gray iron castings shall comply with the provisions
of GB/T 12226; the technical requirements for malleable iron castings shall comply
with the provisions of GB/T 9440; the technical requirements for ductile iron castings
shall comply with the provisions of GB/T 12227; the technical requirements for copper
alloy castings shall comply with the provisions of GB/T 12225; the technical
requirements for copper alloy forgings shall comply with the provisions of GB/T 29528;
the technical requirements for stainless steel castings shall comply with the provisions
of GB/T 12230; the technical requirements for stainless steel forgings shall comply with
the provisions of GB/T 35741.
6 Technical requirements
6.1 Pressure-temperature rating
6.1.1 The pressure-temperature rating shall be determined by the smaller pressure-
temperature rating of the valve body and internal component materials.
6.1.2 The pressure-temperature rating of cast iron valves shall comply with the
provisions of GB/T 17241.7.
6.1.3 The pressure-temperature rating of copper alloy valves shall comply with the
provisions of GB/T 15530.8.
6.1.4 The pressure-temperature rating of stainless steel valves shall comply with the
provisions of GB/T 12224.
6.2 Structure length
The structure length of valves shall comply with the provisions of GB/T 12221 or the
requirements of the purchase contract.
6.3 Connection end
6.3.1 The pipe threads at both ends of the valve shall comply with the provisions of
GB/T 7306 (all parts), GB/T 7307, and GB/T 12716.
6.3.2 The surface roughness Ra value of the pipe thread shall not exceed 6.3 μm, and
the thread surface shall be smooth and free from obvious defects such as dents and
broken thread.
6.3.3 The angular deviation of the pipe thread axis at both ends shall not exceed 1°.
6.4 Minimum flow diameter
The minimum flow diameter of the valve shall not be less than the specifications in
Table 4.
6.13.2 After the sealing packing is installed in the stuffing box, the sealing performance
shall be guaranteed and a certain adjustment margin shall be provided.
6.13.3 When the ball valve is fully open, the angular deviation between the axis of the
ball through-hole and the axis of the valve body through-hole shall not exceed 3°.
6.14 Operation
6.14.1 Regardless of the type of hand wheel or handle configured for the valve, under
the condition of maximum differential pressure of the valve, the maximum operating
force of the hand wheel or handle configured shall not exceed 360 N.
6.14.2 For gate valves, ball valves, and globe valves, rotating the hand wheel or handle
clockwise closes the valve and counterclockwise opens it. When opening a ball valve,
the handle shall be parallel to the ball passage.
6.14.3 Hand wheels and handles shall be provided with permanent markings indicating
the direction of switching.
6.14.4 Hand wheels and handles shall be securely installed and easy to disassemble and
replace.
6.14.5 Ball valves shall be provided with limit structures for full opening and full
closing.
6.15 Appearance
6.15.1 The valve surface shall be free from defects such as sand-holes, cracks, looseness,
and non-metallic inclusions.
6.15.2 All non-machined outer surfaces of cast iron valves shall be painted or powder
coated. The paint or powder coating shall be firmly adhered and uniform in color, and
shall not have obvious defects such as paint runs, bubbles, or poor coatings.
6.15.3 The valve cavity shall not be painted, but shall be provided with rust prevention
measures.
6.16 Shell strength
After the shell test, there shall be no structural damage, and no visible leakage through
the valve shell wall and any fixed valve body connection.
6.17 Sealing performance
When valves are tested for sealing, during the test duration, the maximum permissible
leakage at the seal of non-metallic valves shall meet the Class A requirements of GB/T
13927-2022, and the maximum permissible leakage at the seal of metallic valves shall
meet the Class D requirements of GB/T 13927-2022.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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