GB/T 18688-2023 English PDFUS$364.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 18688-2023: Agricultural irrigation equipment - Pressure losses in irrigation valves - Test method Status: Valid GB/T 18688: Historical versions
Basic dataStandard ID: GB/T 18688-2023 (GB/T18688-2023)Description (Translated English): Agricultural irrigation equipment - Pressure losses in irrigation valves - Test method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B91 Classification of International Standard: 65.060.35 Word Count Estimation: 20,228 Date of Issue: 2023-11-27 Date of Implementation: 2024-06-01 Older Standard (superseded by this standard): GB/T 18688-2012 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 18688-2023: Agricultural irrigation equipment - Pressure losses in irrigation valves - Test method---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. ICS 65:060:35 CCSB91 National Standards of People's Republic of China Replace GB/T 18688-2012 Pressure loss of irrigation valves in agricultural irrigation equipment experiment method Testmethod (ISO 9644:2018,IDT) Published on 2023-11-27 2024-06-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee ForewordThis document complies with the provisions of GB/T 1:1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting: This document replaces GB/T 18688-2012 "Test Method for Pressure Loss of Irrigation Valve of Agricultural Irrigation Equipment" and is consistent with Compared with GB/T 18688-2012, in addition to structural adjustments and editorial changes, the main technical changes are as follows: a) Changed the scope (see Chapter 1, Chapter 1 of the:2012 edition); b) Changed the definition of pressure loss of the test bench (see 3:5, 2:5 of the:2012 edition); c) The requirements for flow measuring instruments have been changed (see 4:2:3, 4:2:3 of the:2012 edition); d) Changed the requirements for pressure measuring holes (see 4:2:5,:2012 version of 4:2:5); e) The requirements for the allowable fluctuation value of the measured quantity have been changed (see 5:2:1, 5:2:1 of the:2012 version); f) The test method of valves has been changed (see 5:4,:2012 version of 5:4): This document is equivalent to ISO 9644:2018 "Pressure loss test method for irrigation valves of agricultural irrigation equipment": Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents: This document is proposed by China Machinery Industry Federation: This document is under the jurisdiction of the National Agricultural Machinery Standardization Technical Committee (SAC/TC201): This document was drafted by: Ningbo Yaofeng Water Saving Technology Co:, Ltd:, China Academy of Agricultural Mechanization Sciences Group Co:, Ltd:, Jiangsu University Xue Fluid Mechanical Engineering Technology Research Center, Lewei Pump Industry Co:, Ltd:, Hebei Runong Water Saving Technology Co:, Ltd:, Xinjiang Academy of Agricultural Sciences Agricultural Mechanization Research Institute, Xinjiang Hongyan Smart Agricultural Technology Co:, Ltd:, and Zhejiang Provincial Pump and Valve Product Quality Inspection Center: The main drafters of this document: Zhang Feng, Wu Wenjing, Cao Puyu, Zhang Xiansheng, Zhang Haiping, An Shengxin, Yang Huimin, Lin Hongbing, Yuan Shouqi, Zhang Ping, Wang Yang, Zhang Fan, Xing Li, Lu Shusheng, Zhao Liwei: This document was first published in:2002, revised for the first time in:2012, and this is the second revision: Pressure loss of irrigation valves in agricultural irrigation equipment experiment method1 ScopeThis document applies only to manual valves: This document specifies a test method for the determination of the pressure loss produced when water flows through agricultural irrigation valves (hereinafter referred to as valves) under steady conditions: The range and accuracy of valve performance parameters presented will assist agricultural irrigation system designers in comparing the pressure losses of various types of valves: Through the pressure loss test, the functional relationship between the flow rate of the valve and the pressure loss can be obtained: This document also specifies the processing method of test data and the content of the test report: This document does not cover the purpose, design and application of the product: The test method described in this document is suitable for valves with equal inlet and outlet nominal dimensions:2 Normative reference documentsThis document has no normative references:3 Terms and definitionsThe following terms and definitions apply to this document: 3:1 Nominal sizenominalsize DN Numerical designation used to indicate valve size: 3:2 volumeflowrate flowflowrate qV The volume of water flowing through the valve per unit time: 3:3 pressure losspressureloss Δp The pressure difference produced when water flows through two specified points in a system or a certain part of the system: 3:4 piping pressure loss pipingpressureloss Δpp The pressure loss in the test pipeline between the two pressure measuring holes upstream and downstream of the tested valve does not include the pressure loss of the tested valve: (See 5:4:4) 3:5 Benchpressureloss Δpb The head loss between the pressure measuring holes upstream and downstream of the measurement area, excluding the pressure loss of the valve under test: ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 18688-2023_English be delivered?Answer: Upon your order, we will start to translate GB/T 18688-2023_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 18688-2023_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 18688-2023_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 18688-2023?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 18688-2023 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
