GB/T 5921-2015Motor vehicles and towed vehicles -- Air braking systems -- Identification of connections on units (English PDF)

Foreword

This standard is drafted as per the rules of GB/T 1.1-2009.

This standard replaces GB/T 5921-1986 "Motor vehicles and towed vehicles -

Air braking systems - Identification of connections on units". As compared with

GB/T 5921-1986, the main technical changes of this standard are as follows.

- CHANGE the "Introduction" into "Scope" (see Chapter 1 of this version;

Chapter 1 of 1986 version);

- DELETE the consistency descriptions with international standard of

Chapter 1 (see Clause 1.3 of 1986 version);

- AMEND the title of Chapter 2 (see Chapter 2 of this version; Chapter 2 of

1986 version);

- COMBINE the Chapter 2 and 3 of the previous standard, and re-edit the

clause structures;

- ADD the mark descriptions of same connection with multiple functions (see

Clause 2.5 of this version).

Adopting re-drafting method, this standard modifies-adopts ISO 6786.1980

"Road vehicles – Air braking systems - Identification of connections on units

(English Version)". As compared with ISO 6786.1980, the main structural

modifications are as follows.

- INCORPORATE Chapter 2 of ISO 6786 into Chapter 1 of this standard;

- REVISE Clause 3.1.1 and 3.1.2 of ISO 6786 as the listed items of Clause

1 Scope

This standard specifies the method for identifying connections on each unit of

air braking system of motor vehicles and towed vehicles (including the

pneumatic units of air-over-hydraulic braking system).

This standard applies to motor vehicles and towed vehicles, as well as for the

braking system diagram.

2 Mark

0 vacuum connection

1 air intake connection

2 air vent connection (not to atmosphere, see digit 3)

3 exhaust connection

4 control connection (access unit)

5 spare

6 spare

7 antifreeze connection

8 lubricant connection (for air compressor)

9 coolant connection (for air compressor)

b) The second digit.

When there are several connections of similar functions on one unit, such as in

......