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  4. N° 089 Hydraulic fittings
 
 
 

Hydraulic fittings

1. The component

There are many models of hydraulic fittings. It is sometimes difficult to find your way around.

 
1 implantation raccords
 

The hydraulic coupling has 2 ends:

  • Installation: The fitting is screwed onto a drilled block or onto a hydraulic component.
  • The adaptation: This is the part of the connection where the flexible or rigid hydraulic is screwed.

In Fig. A is shown a swiveling 90° elbow fitting. The implantation is in cylindrical gas and the adaptation is in JIC.

 

This type of fitting is called hybrid, meaning that each end is different. One comes from a French standard (AFNOR) and the other from an American standard (SAE).

A fitting is identified and recognized by:

  • its visual form. (74° cone, 24° cone, flat, nut shape...)
  • Her size. Fittings are classified by size.
  • Its thread. The thread can be inch or metric.

2. Origin of fittings

2 tableau des origines des raccords hydrauliques
 

The table Fig. B represents the origin of the fittings.

 

Hydraulic and electrical training

On site in business and/or videoconference

We move with a simulation bench, the training sessions alternate theory and practice.

The simulation bench makes it possible to reproduce industrial and mobile assemblies.

For any questions CONTACT US

A. USA

( SAE : Society of Automotive Engineers)

  • NPT installation: This is a conical thread on the inch side. Present in particular in nitrogen circuits. Sealing is done with sealant or Teflon.
  • JIC Adaptation: The fitting has a 74° external cone. Sealing is metal/metal.
  • ORFS adaptation (O'Ring Face Seal): The fitting has a flat surface where a seal is housed.
  • SAE 3000 PSI flange: This type of flange is very common. It is used in circuits where the pressure is less than 200 bars.
  • 6000 PSI flange: This type of flange is very common. It is used in circuits where the pressure is greater than 200 bars.
 

B. English

(BSP : British Standard Pipe)

  • Installation and adaptation BSP: This is a cylindrical inch-size thread. The fitting has a 60° inside cone. Sealing is metal/metal.

Since the sealing cone is inside the fitting, the fitting can serve both as an adaptation or as an implantation.

The thread is identical to the gas fitting, it can perfectly replace a cylindrical gas fitting. For implantation, sealing is done with a BS ring.

 

C. French

(AFNOR : Association Française de NORmalisation)

  • Gas fitting: This is a cylindrical inch-size thread. Sealing is done by a seal present on the fitting or a BS ring. There is also the conical gas, it is to be avoided for the hydraulic circuits because the sealing must be done with joint paste.

The gas thread of the installation is identical to the BSP fitting.

  • Metric adaptation: The fitting has a 24° internal cone. Sealing is metal/metal. The adapter thread is metric.

The gas thread of the installation is identical to the BSP fitting.

 

D. German

(DIN : Deutches Institut für Normung)

  • Metric layout: This is metric cylindrical thread. Sealing is done by a seal present on the fitting or a BS ring.
  • Metric adaptation: The fitting has a 24° internal cone. Sealing is metal/metal or with a seal present on the tube connection.

There are 3 series of adaptations:

    • LL series: Very light series: It is a small dimension fitting often used for lubrication systems.
    • L series (Low): Light series: This is a fitting used for hydraulic circuits not exceeding 200 bars.
    • S series (Strong): Heavy series: This is a fitting used for hydraulic circuits exceeding 200 bars.
 

3. Identify a fitting

3 reconnaitre un raccord
 

The table Fig. C makes it possible to identify the most common fittings by measuring the fitting.

 

4. Connections

4 union

The union makes it possible to connect 2 female connections between them.

Pictured: Union BSP

 
5 manchon

The sleeve fitting connects 2 male connections to each other.

Pictured: Cylindrical gas sleeve fitting.

 
6 reduction

Reduction reduces the size of the connection.

Pictured: BSP Male Reduction

7 adaptateur

The adaptation makes it possible to adapt 2 connections of different standards.

Pictured: Conical Gas Adapter / BSP.

 
8 coude bsp male

The elbow makes it possible to connect 2 connections while respecting the radius of curvature of the flexible or rigid.

Pictured: Male BSP elbow.

 
9 coude orientable

The adjustable elbow allows to connect 2 connections respecting a given orientation.

On the photo: Swivel elbow gas / BSP installation.

 
10 te

The male or female tee is used to connect 3 connections.

Pictured: BSP male tee

 
 

 
 

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