Surface roughness ≤ Ra 3,2 μm
Sealing surface finish: 0,8 μm to 0,05 μm
Material hardness: 75 Rockwell (HRB 75) minimum
a Minimum length of the receptacle which is clear of provisions for attachment of receptacle or protective caps.
4.2.
Figure 2 shows the dimensions of the filling unit for vehicles of categories M
2
, M
3
, N
2
and N
3
Figure 2
20 MPa filling unit size 2 (receptacle) for M
2
, M
3
, N
2
and N
3
vehicles
[Bild bitte in Originalquelle ansehen]
Dimensions in millimetres
Key
a
[Bild bitte in Originalquelle ansehen]
This area shall be kept free of all components.
1.
Sealing ID = Ø 15,47 ± 0,1 width = Ø 3,53 ± 0,2
Surface roughness < Ra 3,2 μm
Sealing surface finish: 0,8 μm to 0,05 μm
Material hardness: 75 Rockwell (HRB 75) minimum
(1) Road vehicles — Compressed natural gas (CNG) refuelling connector — Part 1: 20 MPa (200 bar) connector.
(2) Road vehicles — Compressed natural gas (CNG) refuelling connector — Part 2: 20 MPa (200 bar) connector, size 2.
(3) As defined in Annex 7 to the Consolidated Resolution on the Construction of Vehicles (R.E.3) (TRANS/WP.29/78/Rev.1/Amend.2).
ANNEX 4G
Provisions regarding the approval of gas flow adjuster and gas/air mixer or gas injector
1. The purpose of this Annex is to determine the provisions regarding the approval of the gas flow adjuster and gas/air mixer or gas injector.
2. Gas/air mixer or gas injector
2.1. The material constituting the gas/air mixer or gas injector which is in contact with CNG shall be compatible with the CNG. In order to verify this compatibility, the procedure specified in Annex 5D shall be used.
2.2. The gas/air mixer or gas injector shall conform to the requirements of Class 1 or 2 components, according to their classification.
2.3. Test pressures
2.3.1.
The gas/air mixer or gas injector of Class 2 shall withstand a pressure twice the working pressure.
2.3.1.1.
The gas/air mixer or gas injector of Class 2 shall be free from leakage at a pressure twice the working pressure.
2.3.2.
The gas/air mixer or gas injector of Class 1 and Class 2 shall be so designed to operate at temperatures as specified in Annex 5O.
2.4. Electrical operated components containing CNG shall comply with the following:
(i) They shall have a separate ground connection;
(ii) The electrical system of the component shall be isolated from the body;
(iii) The gas injector shall be in closed position when the electric current is switched off.
3. Gas flow adjuster
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