GB/T 34425-2023Fuel cell electric vehicles hydrogen refueling nozzle (English PDF)

3.1 Hydrogen refueling nozzle

A refueling nozzle, which is installed at the end of the hydrogenation hose of the hydrogen refueling machine, to connect the hydrogen refueling machine and the vehicle.

3.2 Receptacle

When refueling, the sum of components connecting the vehicle to the hydrogen refueling nozzle.

[Source. GB/T 26779-2021, 3.1, with modifications]

3.3 Connector

A receptacle and hydrogen refueling nozzle assembly, that can be quickly connected and disconnected to refuel fuel cell electric vehicles or storage systems.

3.4 Cycle

A whole process including the connecting the hydrogen refueling nozzle and the receptacle, pressurizing to the design pressure, depressurizing, disconnecting.

5.1 General requirements

5.1.4 The hydrogen refueling nozzle should have filters and other protective measures,

to prevent upstream solid matter from entering.

5.1.5 The hydrogen refueling nozzle shall be able to work normally in the ambient temperature range of -40 °C ~ 60 °C and the medium temperature range of -40 °C ~ 85 °C.

5.1.6 For the hydrogen refueling nozzle, it is not allowed to open the one-way valve of the receptacle through mechanical means.

5.1.7 When the internal pressure is greater than 1 MPa, the hydrogen refueling nozzle shall not be removed.

5.2 Performance requirements

5.2.1 Air tightness

Carry out the air tightness test according to the method specified in 6.3.If no bubbles are detected within the specified time, the sample passes the test. If bubbles are detected, use a vacuum test (overall cumulative test) to measure the leakage rate, OR use other equivalent methods to confirm that the hydrogen leakage rate is less than 20 cm3/h at 20 °C and 101 kPa.

5.2.2 Drop

After testing according to the method specified in 6.4, the hydrogen refueling nozzle can be connected normally to the receptacle and the tight fit test equipment specified in

5.2.6 Durability

5.2.6.1 Hydrogen refueling nozzle

After testing according to the method specified in 6.8.1, the hydrogen refueling nozzle meets the requirements in 5.2.1, 5.2.5 (only -40° C related content) and 5.2.10. of 5.2.9.

During the test, according to the requirements in Table 3, replace the loose and tight fit test equipment every 15000 times and check their wear. The wear and tear of test equipment shall comply with the requirements of Appendix D.

5.2.7 Aging resistance

5.2.7.1 Oxygen aging resistance

Conduct an oxygen aging resistance test on the hydrogen refueling nozzle seal, according to the method specified in 6.9.1.There shall be no obvious deformation, deterioration, spots, cracks, etc.

5.2.9 Resistance

According to the method specified in 6.11, the resistance of the connector shall not be greater than 1000 ohm under pressure and non-pressure conditions. Conduct resistance tests before and after the life cycle test.

5.2.10 Hydrostatic strength

Carry out the test according to the method specified in 6.12.There is no leakage in the hydrogen refueling nozzle and connector during the test.

The hydrostatic strength test is the final test. The sample shall not be used for any other tests after this test.

6.1 General provisions

6.1.1 Test conditions

Unless otherwise specified, the test shall be carried out under the following conditions.

6.1.2 Measurement parameters, their units, accuracy

The measurement parameters, their units, accuracy requirements are as shown in Table 2.

6.2 Appearance inspection

Visually inspect the hydrogen refueling nozzle.

6.3 Air tightness

When the hydrogen refueling nozzle is connected to the receptacle and the receptacle is in a closed state, OR when the hydrogen refueling nozzle is not connected to the receptacle and the hydrogen refueling nozzle is in a closed state, leak detection gas is passed through to carry out the test at 0.5 MPa and 1.5 times the nominal working pressure, respectively.

6.4 Drop

Place the hydrogen refueling nozzle in an environment of -40 °C for 24 hours. Then connect it to a filling hose which has a length of 5 m.

6.5 Valve operating handle

For a hydrogen refueling nozzle equipped with a valve operating handle, a force of 200 N is applied in the opening and closing directions of the farthest point from the rotation axis. The tests are conducted under two conditions.

6.8 Durability

6.8.1 Hydrogen refueling nozzle

Perform 100000 cycles on the hydrogen refueling nozzle. One cycle is defined as.

6.8.2 Connectors

Connect the connector to the test equipment; the outlet of the receptacle is connected to the atmosphere; the air inlet of the hydrogen refueling nozzle is connected to the leakage test gas source.

6.22 Swing/twist

Install the receptacle horizontally on a fixed support, that can withstand the specified load without displacement or deflection.