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Intermediate sleeve FI12 (for flaring)

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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Intermediate sleeve FI12 for flaring hydraulic pipes – 12 mm

The FI12 intermediate sleeve for flaring is a connection element designed for rigid steel pipes with an outer diameter of 12 mm. It is used in power hydraulics installations where the pipe end is formed by the flaring method and then connected to a properly selected fitting and nut. The sleeve acts as a thrust element, supporting the correct transfer of pressure to the formed pipe end. This solution is used when creating new installations and for the repair and modernization of existing pipelines.

The FI12 designation corresponds to a pipe outer diameter of 12 mm. This size is used, among others, in compact hydraulic installations, control lines, and machine systems where small fitting dimensions are important. The sleeve should be selected for a specific system of flared connections, taking into account the geometry of the fitting and the pipe wall thickness.

Technical parameters of the FI12 intermediate sleeve

Product type: intermediate sleeve for flaring.
Nominal size: FI12.
Outer diameter of the matching pipe: 12 mm.
Connection type: tubular, flared.
Intended use: rigid steel pipes for hydraulic installations.
Function: support for the formed flare and cooperation with the nut.
Matching elements: appropriate nut, flared pipe, and fitting.
Application: power hydraulics, pipe installations, and machine service.

Application of the FI12 sleeve in power hydraulics

The FI12 sleeve is designed for making connections of steel pipelines used in hydraulic systems. It can be used in machine tool installations, hydraulic power units, industrial equipment, agricultural machinery, and mobile equipment. Depending on the parameters of the entire installation, pipes with an outer diameter of 12 mm can be used to carry hydraulic oil in control, supply, or auxiliary circuits.

The small diameter of the matching pipe facilitates the design of compact piping systems where installation space is limited. A correctly selected flared connection allows the pipeline to be connected to the fittings without the need for a flexible hose. The condition for correct operation is the compatibility of the elements and the proper preparation of the pipe end.

Function of the intermediate sleeve in a flared connection

When making a connection, the end of the steel pipe is appropriately formed using a flaring tool. The resulting flare cooperates with the fitting surface, while the intermediate sleeve is located on the nut side and provides support for the formed end. When tightening the nut, the sleeve helps transfer the clamping force to the pipe flare.

Such a solution enables the creation of a detachable pipe connection. The tightness of the entire assembly depends on the appropriate geometry of the flare, the condition of the mating surfaces, and correct assembly. The sleeve does not replace proper pipe forming nor does it compensate for discrepancies between the nut and the fitting.

Selection of the FI12 sleeve for a 12 mm steel pipe

The basic selection parameter is the pipe outer diameter of 12 mm. However, its wall thickness, the type of flare being made, the nut design, and the type of fitting should also be checked. Pipes with the same outer diameter can differ in wall thickness, which affects the method of end preparation and the requirements for the flaring tool.

The FI12 designation does not specify the nut thread or the geometry of the sealing surface. Before completing the connection, ensure that the sleeve, nut, and fitting are intended for the same system. When repairing older installations, it is worth comparing the elements with the existing connection.

Flaring sleeve vs. cutting ring – differences

The FI12 intermediate sleeve is not a cutting ring. In a flared connection, the pipe end is previously appropriately formed, and the sleeve cooperates with the prepared flare. In contrast, in a bite-type (cutting ring) connection, a special ring clamps onto the outer surface of the pipe during assembly. These elements belong to different connection systems and should not be used interchangeably.

The FI12 intermediate sleeve should also not be confused with a crimp ferrule for hydraulic hose assembly. The described element works with a rigid steel pipe, while ferrules for flexible hoses are selected according to the diameter, construction, and type of the hose and the fitting used.

Preparing the FI12 pipe end for flaring

Before making the connection, check the diameter and wall thickness of the pipe and assess its surface condition. The end should be cut perpendicular to the pipe axis, cleaned, and deburred. The nut and intermediate sleeve must be installed in the correct order before starting the flaring process, in accordance with the requirements of the system used.

A suitable die and tool designed for the specific pipe size should be used for flaring. After forming, check the uniformity of the flare, the condition of the edges, and the absence of cracks and deformations. An incorrectly prepared end should be redone rather than attempting to fix a leak by over-tightening the nut.

Assembly and inspection of the hydraulic connection

When assembling the connection, align the pipe coaxially with the fitting and avoid stresses that force its position. The nut must be tightened in accordance with the requirements of the connection system used. After assembly, check the piping support to limit the impact of vibrations and mechanical loads on the connection point.

Before starting work, the hydraulic system should be safely depressurized. After assembly is complete, a leak test should be carried out according to the procedure applicable to the system. Do not check for potential oil leaks under pressure directly with your hand.

Main advantages of the FI12 intermediate sleeve

Designed for flared steel pipes with a diameter of 12 mm.
Can be used in compact hydraulic installations.
Support for the formed pipe end.
Cooperation with a properly selected nut and fitting.
Application during the construction of rigid pipelines.
Useful for repairs and modernization of hydraulic systems.
Possibility to assemble the connection from separate elements.

Technical specification

Parameter	Value
Product	Intermediate sleeve FI12
Size	FI12
Pipe outer diameter	12 mm
Connection type	Flared
Intended use	Rigid hydraulic pipes
Function	Flare support and cooperation with the nut
Application	Power hydraulics installations

Frequently Asked Questions (FAQ)

Which pipe does the FI12 intermediate sleeve fit?

The sleeve is designed for flared connections of steel pipes with an outer diameter of 12 mm. You should also check wall thickness compatibility and connection design.

Can the FI12 sleeve be used in power hydraulics?

Yes, it is designed for pipe connections used in hydraulic systems. Permissible operating conditions should be determined based on the parameters of the complete connection system.