GB/T 25753.2-2010 English PDFUS$169.00 ยท In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 25753.2-2010: Vacuum technology -- Roots vacuum pump -- Measurement of performance characteristics -- Part 2: Measurement of compression ratio of the zero throughput Status: Valid
Basic dataStandard ID: GB/T 25753.2-2010 (GB/T25753.2-2010)Description (Translated English): Vacuum technology -- Roots vacuum pump -- Measurement of performance characteristics -- Part 2: Measurement of compression ratio of the zero throughput Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J78 Classification of International Standard: 23.160 Word Count Estimation: 7,778 Date of Issue: 2010-12-23 Date of Implementation: 2011-10-01 Quoted Standard: GB/T 25753.1-2010 Regulation (derived from): National Standard Approval Announcement 2010 No.10 (Total No.165) 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 Roots vacuum zero-flow compression ratio measurement method. This section applies to pumping speed of 30 L/s-20 000 L/s Roots vacuum pump (hereinafter referred to as the pump). GB/T 25753.2-2010: Vacuum technology -- Roots vacuum pump -- Measurement of performance characteristics -- Part 2: Measurement of compression ratio of the zero throughput---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. .. Vacuum technology Roots vacuum pump Measurement of performance characteristics Part 2. Measurement of compression ratio of the zero throughput ICS 23.160 J78 National Standards of People's Republic of China Roots vacuum pumps - Measurement of performance art Part 2. Measurement of zero-flow compression ratio Part 2. Measurementofcompressionratioofthezerothroughput Issued on. 2010-12-23 2011-10-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released ForewordGB/T 25753 "Roots vacuum pumps - Measurement of performance art" is divided into three parts. --- Part 1 maximum allowable differential pressure measurement; --- Part 2 compression ratio of zero flow measurement; --- PART 3 relief valve differential pressure measurement. This is Part 2 GB/T 25753 of. This part is proposed by China Machinery Industry Federation. This part of the National Vacuum Technology Standardization Technical Committee. This section is responsible for drafting. Zhejiang Vacuum Equipment Group Co., Ltd. Participated in the drafting of this section. Chengdu South-ray machines Limited, Shenyang Institute of Scientific Instrument Development Center, Shandong Zibo Vacuum Equipment Co., Ltd., Anhui Hefei Science and Technology Co., Ltd., Shenyang Institute of Vacuum Technology. The main drafters of this section. Wang Xiaohu, Xu Tao, Fanlin Dong, Wang Guangyu, Xu Jian law, Ms. Huang, Wang Lingling, ROCKETS.IntroductionWith the development of basic industries and design innovation, design and performance Roots pump structure have made considerable Progress early Roots vacuum pumps must rely on pre-pump operation, and now the development of a direct atmospheric discharge run-cooled Roots Roots vacuum pumps and wet, the other a single series Roots vacuum pump has become the single-stage single-stage, two-stage, multi-stage, rotor profile also Futaba become the double leaf, clover, leafy. Existing Roots vacuum pump performance measure encompasses only a single-stage double-lobe Roots pump, other types of basic not involved, and Not made on how to measure the differential pressure relief valve specifications, to effectively improve the Roots vacuum pump performance measurement standards compatibility and suitability for the practical Test measurements provide the necessary operating instructions, drawing in a wide range of domestic and foreign-related indicators, benchmarks, based on the actual situation, the development of the "vacuum Roots vacuum pump performance measurement technology "standards, and is divided into three parts. Extreme pressure and pumping rate of the Roots vacuum pump unit Energy measurements, not according to the standard content. In the future will make the necessary modifications and expansion basis of technological development. Roots vacuum pumps - Measurement of performance art Part 2. Measurement of zero-flow compression ratio1 ScopeGB/T 25753 provisions of this part of the Roots vacuum pump zero flow measurements compression ratio. This section applies to a pumping speed 30L/s ~ 20000L/s Roots vacuum pump (hereinafter referred to as the pump).2 Normative referencesThe following documents contain provisions which, through reference GB/T 25753 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 25753.1-2010 Roots vacuum pump performance measurement techniques - Part 1 maximum allowable differential pressure measurement3 Terms and DefinitionsThe following terms and definitions apply GB/T 25753 in this section. 3.1 Zero flow compression ratio compressionratioofthezerothroughput Zero flow compression ratio K0 is closed Roots vacuum pump inlet valve, the gas flow rate is zero, the pump discharge pressure and the inlet pressure ratio. The compression ratio of the maximum value is called the zero flow the maximum compression ratio, with K0, max represents. 3.2 Test cover testdome Special vacuum vessel having a predetermined precise shape and dimensions, through which the gas to be measured into the pump, on which pressure measurement Means.4 deviceSee GB/T 25753.1-2010 Chapter 3.5 Test methods5.1 Principle Close Roots vacuum pump inlet valve, and then the front side regulating different stage vacuum pressure with an appropriate manner (pneumatic). Pumping speed when measuring method allows the use of pneumatic and supplemented adjusted before the pump outlet pressure is adjusted. 5.2 Program First, according to GB/T 25753.1-2010 test cover connection in Figure 3, a pressure gauge, inlet valve, and the former foreline pump, closing the intake valve A and B intake valve, after the pump pressure and the temperature reached the limit equilibrium by adjusting the foreline cover intake valve B test introduced Dry gas, into a different amount of gas test hood B form different pressures. After pressure equilibrium is reached, respectively, with the pressure measuring A stress test the amount of cover and inside cover B test, you can get a series of zero-flow compression ratio K0 value, the maximum compression ratio of the series is Zero flow maximum compression ratio. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 25753.2-2010_English be delivered?Answer: Upon your order, we will start to translate GB/T 25753.2-2010_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 25753.2-2010_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 25753.2-2010_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. 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