BS/EN 4834-2018 pdf download.Aerospace series – Adaptor, Pipe coupling 24° Cone up to 35 000 kPa (5 080 psi) Port for Ring locked fitting – Inch Series – Geometric configuration.
This BS/EN 4834 specifies the dimensions, tolerances and requirements of a port for a fluid connection with ring locked fitting, for use in aircraft systems at nominal operating pressure of 35 000 kPa (5 080 psi) maximum and temperature range of —54 to +135 °C (—65 to +275 °F).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2815, Aerospace series — Steel FE-PM 1802 (X5CrN1Cu 15-5) — Consumable electrode remelted — Solution treated and precipitation treated — Bar for machining — a or D ≤200 mm — Rm 965 MPa
EN 2817, Aerospace series — Steel FE-PM1 802 (X5CrN1CuI 55) — Consumable electrode remelted — Solution treated and precipitation treated — Bar for machining — a or D ≤200 mm — 1 070 MPa
EN 4832, Aerospace series — Pipe coupling 24°Cone up to 35000 kPa (5080 psi) Ring-locked fitting and Ring-locked fitting-reducer — Inch Series — Technical specification 1)
EN 4833, Aerospace series — Pipe coupling 24° Cane up to 35000 kPa (5080 psi) Ring-locked fitting — Flared End — Inch Series — with Extra Fine Thread Pitch I)
EN 4835. Aerospace series — installation and removal requirements for Ring locked fitting and reducer, 24° Cone up to 35000 kPa (5080 psi) — inch Series1)
EN 4836, Aerospace series — Adaptor, Pipe coupling 24°Cone up to 35000 kPa (5080 psi) Ring-locked fitting Reducer — Flared End — with Extra Fine Thread Pitch — Inch Series’)
Iso 3161, Aerospace — UN) threads — General requirements and limit dimensions
ARP4296, Drawing interpretations standard machining practice, tube fittings and connectors, fluid systems²)
3 Requirements
3.1 General characteristics
The drill and porting tool method oi preparing the machined cavity is mandatory for use with ring locked fitting installed in accordance with EN 4835. The porting tool will size the minor dia and provide balance of cavity configuration ready for broaching serration.
After serrations are broached, chip removal is required.
The minimum boss diameter ‘B and boss length “H’ shown are to resist adapter installation torque and coupling nut torque. They are satisfactory for use In materials that exhibit minimum shear strengths of 179 MPa (26 ksl). A 10% increase In the diameters shown is required for sizes -05 through -08, and a 15 % increase in diameters shown for sizes -10 and above when designing in materials whose shear strength is less than 179 MPa (26 ksi). Increase not required for -02 through – 04. Using design activity may reduce mm “B’ in steel bosses. See also EN 4833 or EN 4836 for boss material strength requirements. The boss material for 35 000 kPa (5 080 psi) systems shall be titanium alloy 6AL-4V or CRES 15-5PH in accordance to EN 2815 or EN 2817.
Use of porting tool and broach tool specified Is mandatory to provide required port configuration. Further information and tools shall be in accordance with EN 4835.
Interpretation of drawing according to ARP4296.
Surface texture: Unless otherwise specified, machined surface to be 3,175 pm (125 pIn) Ra and sealing surface to be 1,6 pm (125 pIn) Ra,
3.2 Configuration, dimensions and tolerances
The configuration, dimensions and tolerances shall be in accordance with Figure 1 and Table 1.
Port serrations shall be compliant with Detail Y.
For production, machining tools provided by the fitting manufacturer may be used.
For control, serration control gauges provided by the fitting manufacturer shall be used.
5 Marking
Not applicable.
6 Technical specification
The technical specification shall be in accordance with EN 4832 (for all item codes, except for -05, -24 and -32 sizes). See ISO 7169 for -05, -24 and -32 sizes.BS/EN 4834-2018 pdf download.
BS/EN 4834-2018 pdf download
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