This standard specifies the determination of the critical foreline pressure of a vapor flow vacuum pump. This standard applies to vapor flow pumps with oil or mercury as the working fluid, including diffusion pumps, jet pumps, and diffusion jet pumps, i.e., oil booster pumps (the pumps can operate in the molecular flow and laminar flow ranges, and have the combined performance of diffusion pumps and jet pumps). The three types of vapor flow pumps are hereinafter referred to as pumps. These pumps may or may not be equipped with baffles or cold traps. JB/T 8472.2-1996 Determination of the performance of vapor flow vacuum pumps Part II: Determination of the critical foreline pressure JB/T8472.2-1996 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T8472.1~-8472.296
eqIs 1608-111993
1S01608-2:1989
Performance Determination of Steam Flow Vacuum Pumps
1996-09-03 Issued
Ministry of Machinery Industry of the People's Republic of China
1997-07-01 Implementation
JB/T 8472.1--8472.296
This standard is formulated based on the international standard IS153 edition and the national standard GB6307.2-86 edition. The technical content of this standard is equivalent to the international standard. The writing format and method of this standard are formed according to the relevant provisions of GB 1.11993 and the technical practice of the original HG307, which is in line with the national standard. This standard is composed of the following parts under the general title of TE/84. Determination of the performance of steam vacuum system: Part 1 (i.e., TE/84.2: Determination of the flow rate (volume) of the steam; Part 2 (i.e., B/8472.2: Determination of the pressure range of the upper limit). As mentioned in the introduction of TS 16 (82), under the general title of the determination of the flow rate of steam in a vacuum system, the third part is titled "Gas flow rate", but this part of the standard has never been seen. Therefore, the first part of this standard can adopt the international standard to calculate the gas reverse rate - / day, and the calculation of the gas flow Q, I is supplemented in the form of Appendix A. Supplement, and give the calculation of the independent gas velocity of the citizens. And, in the form of record, the interest of the air flow rate limit of the standard part of the Appendix 4, the Ministry of Health is the standard limit record. This standard is 1 ≤ S? July 1, 2009, the original GG357.1-~07.2-Appendix abolished. The only national standard is the six technical committees for standardization and export. The responsible unit for the production standard is the Vacuum Technology Research Institute of the Ministry of Machinery Industry, and the main persons in charge of the standard are Zhang Yao and Li Yuying. The standard is entrusted to the Vacuum Technology Research Institute of the Ministry of Machinery Industry to compile and interpret JH/T 8473.2—9h
ISO1608-2 Foreword
ISO (International Organization for Standardization) is a worldwide federation of national standardization bodies (ISO members). The work of preparing international standards is usually carried out through ISO technical committees. For disciplines that have established technical committees: a technical committee is formed every year to effectively monitor this work, and the international organization that has developed with ISO can participate in this work through the government or the government. For all electrotechnical technical standards, ISO works closely with the ILC. The international standard of Na is used to follow the design, and before the war series platform indicates the standard, it is transmitted in the finished product. The international standard of the report process pressure batch should be changed by 75% to reduce the scope of the international standard. The third edition of the TS/TC113 real change technical table is formulated by the TS/TC113 real change technical table. This third edition of the technical revision of the TS cancels the 51-97 edition. The TS project is under the title of the determination of the performance of the high-pressure gas system in the general operation, and contains the following parts: Part 1: Determination of the basic rate (beat rate): Part 2: Measurement of the gas flow rate. Part 3: Gas flow rate. 1608-2
1S1503's date of staff: to ensure that the Xiao steam flow vacuum residual performance measurement connection means the same process in the alternate killing parts trace. Because the comparison. Zhuo each manufacturer's field each laboratory measurement results used in each manufacturer's long case and called H's call will be on a suitable basis. This is for the first household structure factory case double can have some places, people pay attention to the judgment, the complete beat can be reduced in the language when the international standard, for the main evil type steam flow in fact wide range performance re-determination violation! Pan research system. However, for the speed limit of the second use of a number, as far as possible according to the speed of the publication [5 door 160%. 10
People's Republic of China Machinery Industry Standard
Steam flow vacuum pump performance measurement
Part II, the determination of the critical fore-stage pressure of the gold standard parts near the completion of the state of steam flow car air phenomenon of the fore-stage pressure of the definition, JD/T 8472.2-96
0)160R2:1989
This standard is used for steam systems, including diffusion systems, jet systems and diffusion jet systems, which can be used in flow and layer separation. The standard specification is as follows: The following three types of flow cases are also used as the following. These tickets can be installed whether they are blocked or cold researched.
2 Referenced standards
The texts contained in the following standards have become the texts of this standard through reference. When this standard is published, the version indicated by the reference shall be: All standards will be stable when the following versions are updated. The following international standards are likely to be updated when the following international standards are updated. 84?2.1-5 Steam flow and vacuum performance are determined by first distinguishing the oil and gas velocity and the volume flow rate. 3 Definitions
This international standard uses the following definitions.
3.1 Critical forestage pressure
General working conditions, for the system working time and the corresponding gas flow rate, the critical forestage pressure is the pressure of the forestage under the pressure of the forestage ... 3 Ultimate pressure
The rest shall be produced under the specified conditions, and the intake valve shall be closed, and the vehicle shall be tested to a stable internal pressure. 4 Test device
4.1 Test quantity
Add the new figure 1, which shall comply with the provisions of 4.2 in /T172.1. Approved by the Ministry of Machinery Industry on September 3, 1996 bzxz.net
Implemented on July 1, 1997
4.2 Test device The combination of the test device is as shown in the national 2, and the following equipment is required! JB/T 8472.2-96
Figure 1 Frequency test
True life king
a) The air intake fine adjustment (A) of the integrated test device shall be adjusted
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