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GB/T 45978-2025: Pressure and temperature classifications for hydraulic systemms of aerospace
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| GB/T 45978-2025 | English | 209 |
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Pressure and temperature classifications for hydraulic systemms of aerospace
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GB/T 45978-2025
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Basic data | Standard ID | GB/T 45978-2025 (GB/T45978-2025) | | Description (Translated English) | Pressure and temperature classifications for hydraulic systemms of aerospace | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | V29 | | Classification of International Standard | 49.080 | | Word Count Estimation | 10,175 | | Date of Issue | 2025-08-01 | | Date of Implementation | 2025-11-01 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB/T 45978-2025: Pressure and temperature classifications for hydraulic systemms of aerospace---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT45978-2025
National Standard of the People's Republic of China
ICS 49.080CCS V 29
Aerospace hydraulic system pressure levels and temperature types
(ISO 6771.2007, Aerospace-Fluid systems components-Pressure and
temperature classifications, MOD)
Released on August 1, 2025
2025-11-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
This document is modified to adopt ISO 6771.2007 “Aerospace fluid systems and components – Pressure and temperature classification”.
Compared with ISO 6771.2007, this document has the following structural adjustments.
--Added Chapter 2 "Normative References";
--Chapter 3 and Chapter 4 correspond to Chapter 2 and Chapter 3 of ISO 6771.2007.
The technical differences between this document and ISO 6771.2007 and their reasons are as follows.
--Deleted the description of hydraulic system application scenarios in the scope (see Chapter 1 of ISO 6771.2007) and added the scope of application
(See Chapter 1), in line with domestic usage habits;
-- Deleted the statement "To meet the requirements of both systems, the higher pressure and higher temperature ranges should be used" (see ISO 6771.
2007, 3.2.1 and 3.2.2), which are in line with domestic usage practices.
The following editorial changes have been made to this document.
--To coordinate with the existing standard, the name of the standard will be changed to "Pressure Levels and Temperature Types for Aerospace Hydraulic Systems";
--Deleted the explanatory statements about the “old pressure levels” and “old temperature types” of the basic system in ISO 6771.2007;
--Deleted the footnotes on unit conversion and newly added pressure levels in Table 1 of ISO 6771.2007, and added the footnotes on equivalent pressure.
Note on force value;
--Deleted the notes to Table 2, Table 3 and Table 4 in ISO 6771.2007.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed and coordinated by the National Technical Committee for Aircraft Standardization (SAC/TC 435).
This document was drafted by. China Aviation Technology Research Institute, China Aviation Industry Corporation Jincheng Nanjing Electromechanical Hydraulic Engineering Research Institute
Center, Harbin Engineering University, Luoyang Electro-Optical Equipment Research Institute of AVIC, Chengdu Aircraft Industry (Group) Co., Ltd.
Xi'an Aircraft Design and Research Institute of China Aviation Industry Corporation, Shenyang Aircraft Design and Research Institute of China Aviation Industry Corporation, Shenyang Aircraft Design and Research Institute of China Aviation Industry Corporation
Aircraft Industry (Group) Co., Ltd., AVIC Xi'an Aircraft Industry Group Co., Ltd.
The main drafters of this document are. Ren Haitao, Wang Zhenzhen, Liu Pingan, Liu Hancong, Liu Zhanping, He Zhiying, He Junwei, Dai Ying, Zhang Shuang, Liu Hui,
Ren Xiujun, Liu Yun, and Liu Hangyu.
Aerospace hydraulic system pressure levels and temperature types
1 Scope
This document specifies the pressure classes and temperature types of basic systems and their components commonly used in aerospace fluid systems.
This document applies to the design, production, and use of aerospace fluid systems.
2 Normative references
This document has no normative references.
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
basic system
Fluid systems used for aircraft control, with temperature types and pressure levels specified by the aircraft specifications.
NOTE 1.The basic system consists of several subsystems.
NOTE 2.Temperature type and pressure level are tested and certified as an integral part of aircraft performance.
3.2
component system
The temperature type and pressure level of the fluid component are usually specified by the product specification.
NOTE 1.Components are individually tested and qualified within each subsystem.
Note 2.The temperature and pressure tolerances of the components are selected appropriately to ensure that the subsystem achieves the same performance whether the components are used in the metric or imperial system.
4 Categories
4.1 Basic System
4.1.1 General
The pressure levels of the basic system are shown in Table 1, and the temperature types are shown in Table 2.No tolerances are permitted for the pressure levels and temperature types of the basic system.
4.1.2 Pressure Level
The pressure level of the basic system shall comply with the requirements of Table 1.
Table 1 Basic system pressure levels
4 000 (40)
10 500 (105)
Pressure Level
Metric
Old pressure level
Pressure value
Basic pressure value
kPa (bar)
Equivalent pressure value a
psi
Imperial
Old pressure level
Pressure value
Basic pressure value
psi
Equivalent pressure value
kPa
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