HOME   Cart(0)   Quotation   About-Us Policy PDFs Standard-List
www.ChineseStandard.net Database: 189759 (19 Oct 2025)

GB/T 34878-2017 English PDF

US$259.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 34878-2017: Vacuum technology -- Valves -- Leak test
Status: Valid
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 34878-2017English259 Add to Cart 3 days [Need to translate] Vacuum technology -- Valves -- Leak test Valid GB/T 34878-2017

PDF similar to GB/T 34878-2017


Standard similar to GB/T 34878-2017

TSG 71   HG/T 6093   GB 19815   GB/T 34876   GB/T 34873   

Basic data

Standard ID GB/T 34878-2017 (GB/T34878-2017)
Description (Translated English) Vacuum technology -- Valves -- Leak test
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J78
Classification of International Standard 23.160
Word Count Estimation 13,143
Date of Issue 2017-11-01
Date of Implementation 2018-05-01
Regulation (derived from) National Standard Announcement 2017 No. 29
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

GB/T 34878-2017: Vacuum technology -- Valves -- Leak test

---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-Valves-Leak test ICS 23.160 J78 National Standards of People's Republic of China Vacuum technology valve leak rate test (ISO 27895.2009, IDT) Posted.2017-11-01 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Foreword Ⅲ Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 symbol 4 5 Requirements 4 6 test method 4 6.1 Leakage valve plate 4 6.2 Body Leakage 6 6.3 Pneumatic Leak Detection (Option) 8 at minimum and maximum compressed air pressure 6.4 Manual valve leak detection under minimum and maximum torque (optional) 8 6.5 Leakage within the operating temperature range (optional) 8 6.6 Bake rate test after baking (optional) 8 7 test report 8 Reference 9

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses the translation method identical with ISO 27895.2009 "Vacuum Technology Valve Leakage Rate Test." The documents of our country that are consistent with the corresponding international documents in the normative references in this standard are as follows. --- GB/T 18193-2000 Vacuum technology helium mass spectrometer leak detector calibration (ISO 3530.1979, IDT). This standard is proposed by the China Machinery Industry Federation. This standard by the National Vacuum Technology Standardization Technical Committee (SAC/TC18) centralized. This standard was drafted unit. Beijing Satellite Environmental Engineering Institute, Hefei Zhihai Optoelectronics Technology Co., Ltd. Anhui Anhui Science and Technology Co., Ltd. Company, Shanghai Vacuum Valve Manufacturing Co., Ltd., North Sichuan Vacuum Technology (Beijing) Co., Ltd., Hunan Yufeng Vacuum Science and Technology Co., Ltd., North Jinglang Wo Technology Co., Ltd., Weihai Mitutoyo Vacuum Technology Co., Ltd., Shenyang Institute of Vacuum Technology. The main drafters of this standard.Sun Lichen, Liu Enjun, Meng Donghui, Yan Rongxin, Hong Xiaopeng, Shi Jijun, Liu Lei, Huang Wenping, Zhang Donglin, Chen Bohao, Zhou Yi, Xu Xi, Lin Lezhong, Zhang Chunyuan, Zhang Haifeng, Sun Lizhi, Wang Li, Wang Lingling.

Introduction

Vacuum valves are the most commonly used components in vacuum systems and valve manufacturers provide technical parameters based on their own testing methods. According to these technical parameters choose the valve. Valve seal leakage rate is one of the most basic technical parameters, but different test methods may lead to test Test results appear a big difference, such as the valve leak rate from the internal gas leak to leak test during the leak rate is constantly changing, so the leak test time The choice of the test results have a great impact, but until this standard was released, there is still no one used to regulate the vacuum valve leak rate test method The national standard There are three main forms of leakage. a) Real leaks, eg gas leaks through larger cracks and holes; b) leakage, in the system, due to the release of gas or vapor caused by increased pressure; c) leakage, gas from the side of the density through the solid structure material exists on the diameter of the pores can be compared with the atomic density to small One side of the infiltration, diffusion, through the process, for example, through the infiltration of rubber materials. Spurious does not apply to the method specified in this standard test. Therefore, when the valve design and selection of valve materials, it is appropriate to leaking air Insurance to a minimum. Vacuum technology valve leak rate test

1 Scope

This standard specifies the vacuum system used to control air flow or vacuum pressure vacuum valve leak rate test method. Apply right after closing Leakage gas leakage rate of less than 1 × 10-5Pa · m3/s leakage rate leak test, but also for the body's leakage rate test can be used For the vacuum valve test basis. This standard applies to the vacuum valve allows the operating pressure range, pressure, baking temperature, operating temperature and life cycle and other provisions of the technical regulations Leakage rate test of the entire work piece under the above conditions, the test leak rate of the valve below the nominal leakage rate given by the manufacturer. Note 1. Affected by the surface accuracy of the valve installation surface of the vacuum equipment installed, the test leak rate and the separate test data after installing the large and valveless vacuum valve There may be differences. NOTE 2 The test leak rate obtained in accordance with this standard is the result of a separate test of individual vacuum valve personnel, possibly in conjunction with the number of valves installed on the vacuum equipment There are differences.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. ISO 3530 Vacuum Technology Vacuum technology-Mass-spectrometer-type leakde- tectorcalibration

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Leak rate leakrate < Vacuum Valve Technology> Under specified conditions, through the valve body, seat or sealing material on the cracks, holes or gaps and other parts of the leak Body flow. Notes 1. Rewrite ISO 3530.1979, definition 2.5.1. Note 2. Leak rate is given in pascals per second. Note 3. The leak rate of tracer gas can be measured with mass spectrometry leak detectors. The leak rate depends on the kind of gas, pressure difference and temperature. Note 4. The definition of standard air leakage rate (3.2) and equivalent standard air leakage rate (3.3) is more detailed. 3.2 Standard air leakage standardairleakrate Under the standard conditions of inlet pressure of (100 ± 5) kPa, outlet pressure of less than 1 kPa and temperature of (23 ± 7) ° C, the dew point is lower than Air at -25 ° C flows through a hole, such as a slit or a small hole. Notes 1. Rewrite ISO 3530.1979, definition 2.5.2. Note 2. The standard status refers to ISO 3530.1979. 3.3 Equivalent standard air leakage equivalentairleakrate Molecular state, the standard air leakage rate of less than 10-7Pa · m3/s leakage rate of thin-walled leaks.

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 34878-2017_English be delivered?

Answer: Upon your order, we will start to translate GB/T 34878-2017_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 34878-2017_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 34878-2017_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+ countries

Question 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 [email protected]. 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.