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GB/T 21387-2008 English PDF

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GB/T 21387-2008: Axial flow check valve
Status: Valid
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GB/T 21387-2008English229 Add to Cart 3 days [Need to translate] Axial flow check valve Valid GB/T 21387-2008

PDF similar to GB/T 21387-2008


Standard similar to GB/T 21387-2008

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Basic data

Standard ID GB/T 21387-2008 (GB/T21387-2008)
Description (Translated English) Axial flow check valve
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J16
Classification of International Standard 23.060.50
Word Count Estimation 10,179
Date of Issue 2008-02-02
Date of Implementation 2008-07-01
Quoted Standard GB 150; GB/T 4423; GB/T 7306
Regulation (derived from) National Standard Approval Announcement 2008 No.2 (Total No.115)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the structure of the axial flow check valve, technical requirements, materials, test methods, inspection rules and availability requirements. This standard applies to nominal PN2. 5 ~ PN150, nominal sizes DN25 ~ DN1800, temperature of not more than 100��C axial flow check valve, their ends connected to form the flange, welded or threaded connection, applicable to water, oil, natural gas and so on.

GB/T 21387-2008: Axial flow check valve

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Aaxial flow check valve ICS 23.060.50 J16 National Standards of People's Republic of China Axial Check Valve Posted 2008-02-02 2008-07-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

The standard proposed by China Machinery Industry Federation. The standard valve by the National Standardization Technical Committee (SAC/TC188) centralized. This standard was drafted. Shanghai Huatong Valve Co., Ltd., Ningbo Ai Ke US copper valve Co., HSBC Shanghai Valve Co., Ltd. The main drafters of this standard. ZHANG Yong-hui, Liu Tienan, Zhengxue Zhen, Tie Ke, Meng Aimin. This standard by the National Standardization Technical Committee valve responsible for the interpretation. Axial Check Valve

1 Scope

This standard specifies the axial-flow check valve structure, technical requirements, materials, test methods, inspection rules and delivery requirements. This standard applies to nominal pressure PN2.5 ~ PN150, nominal size DN25 ~ DN1800, a temperature of not more than 100 ℃ axial stop Return valve; their connections end flange, welded or threaded connection; suitable medium is water, oil, and natural gas.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB 150 steel pressure vessels GB/T 4423 copper and copper alloy rod drawing GB/T 7306 55 ° sealing pipe thread (GB/T 7306-2000, eqv ISO 7-1.1994) GB/T 9113.1 Integral steel pipe flanges GB/T 9124 steel pipe flanges GB/T 12221 metal valve structure length (GB/T 12221-2005, ISO 5752. 1982, MOD) GB/T 12224 General requirements for steel valves GB/T 12225 General Valve copper alloy castings GB/T 12226 General Valve gray iron castings GB/T 12227 General Valve iron castings GB/T 12228 Universal valves carbon steel forgings GB/T 12229 Universal valves carbon steel castings GB/T 12230 Universal valves stainless steel castings GB/T 17241.6 whole cast iron pipe flanges (GB/T 17241.6-1998, neq ISO 7005-2. 1988) GB/T 17241.7 cast iron pipe flanges (GB/T 17241.7-1998, neq ISO 7005-2. 1988) JB/T 5296 General methods of test valve flow coefficient and flow resistance coefficient JB/T 7928 General Valve supply requirements Inspection and testing JB/T 9092-1999 valves

3 Terms

The following terms and definitions apply to this standard. 3.1 Body cavity surface, shroud, valve and other surfaces should be streamlined overcurrent state, and before and after a round tip. Fluid on the surface layer mainly for Flow, little or no turbulence.

4 form structure

Axial check valve can be divided into the sleeve type, disc-type, ring disk type and other forms depending on the form of its valve flap structure, the basic structure of the form Shown in the formula shown in Figure 1 to Figure 3. Allow, in conformity with the technical requirements of this standard, is designed to form other structures.

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