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Intermediate sleeve FI25 (for flaring)

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€1.55

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Manufacturer: HYDRON hydraulika siłowa (go to products)

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Intermediate sleeve FI25 for flaring hydraulic pipes – 25 mm

The FI25 intermediate sleeve for flaring is a hydraulic fitting component designed for making connections of rigid steel pipes with an outer diameter of 25 mm. It is used in flared connections, where the appropriately formed pipe end works with a matching connector, sleeve, and nut. The sleeve creates a supporting surface for the nut and helps transfer the clamping force to the prepared pipe end. It is used during the construction, repair, and modernization of power hydraulic systems.

The FI25 designation refers to the pipe's outer diameter of 25 mm. The product should be selected as part of a complete connection system. Diameter compatibility alone does not guarantee that the sleeve will fit every nut and every type of flare.

Technical parameters of the FI25 intermediate sleeve

Product type: intermediate sleeve for pipe flaring.
Size: FI25.
Outer diameter of the matching pipe: 25 mm.
Connection type: pipe, flared.
Intended use: steel hydraulic pipes.
Function: support for the flared pipe end and interaction with the nut.
Matching elements: appropriately selected nut, connector, and FI25 pipe.
Application area: power hydraulics and machine piping systems.

Application of FI25 sleeves in hydraulic systems

The FI25 intermediate sleeve is used to complete connections of steel pipe lines used in power hydraulics. This type of connection can be found in industrial machine installations, agricultural equipment, construction machinery, hydraulic power units, and other systems using rigid pipelines for hydraulic oil transport.

Pipes with an outer diameter of 25 mm can be used in various parts of the installation, including supply and return lines. However, the choice of pipe and connection is determined by the system design parameters, particularly the operating pressure, flow rate, wall thickness, and strength requirements of the entire assembly.

What function does the intermediate sleeve perform during flaring?

During the preparation of the connection, the end of the steel pipe is appropriately formed using a flaring tool. The resulting flare creates a surface that interacts with the connector. The intermediate sleeve is located on the nut side and acts as a support element, allowing the clamping force to be transferred to the flared end of the pipe.

A properly made flared connection enables the mechanical connection of the pipe line with the fittings. Its leak-tightness depends on the geometry of the flare, the condition of the mating surfaces, the compatibility of individual parts, and the correct tightening of the nut.

Selecting the sleeve for a 25 mm diameter steel pipe

The basic criterion for selecting the FI25 sleeve is the pipe's outer diameter of 25 mm. The wall thickness of the line, the type of flaring, and the design of the other connection components should also be checked. Pipes with the same outer diameter can have different wall thicknesses, therefore they require proper end preparation and compatibility with the flaring tool.

When completing the connection, a nut with the appropriate thread and a connector with a geometry matching the prepared flare must be selected. The FI25 pipe diameter does not automatically determine the connection thread. In the case of repairing an existing installation, it is worth comparing all elements with the previously used system.

Flaring sleeve vs cutting ring

An intermediate sleeve for flaring is not a replacement for a cutting ring. In a flared connection, the pipe end must be appropriately formed beforehand. In contrast, in systems with a cutting ring, the compression element interacts directly with the outer surface of the pipe. Both solutions require fittings of different designs.

The FI25 intermediate sleeve is also not a crimp sleeve for crimping flexible hydraulic hoses. Its purpose is for connecting rigid steel pipes, not for mounting fittings on rubber hoses.

Pipe preparation and flared connection assembly

Before starting assembly, check the pipe dimensions, surface condition, and compatibility of the connection components. The pipe end should be cut evenly, cleaned, and deburred. The nut and sleeve should be placed on the pipe in the correct order, according to the design of the system being used.

The flare should be made with the appropriate tool, and then its symmetry and the condition of the sealing surface should be checked. Ends with cracks, indentations, or other deformations should not be used. After tightening the connector, a leak test should be carried out according to the procedure applicable to the given hydraulic system.

Correct routing of FI25 hydraulic pipes

In installations with pipes having an outer diameter of 25 mm, it is important to properly support the lines and limit the stresses acting on the connections. The pipeline should be routed in a way that does not force displacement or deformation of the end when tightening the nut. In machines exposed to vibrations, proper placement of clamps and the operating conditions of the entire system must be taken into account.

Key advantages of the FI25 intermediate sleeve

Intended for flared connections of steel hydraulic pipes.
Size corresponding to an outer pipe diameter of 25 mm.
Compatibility with a matching nut and connector.
Support for the formed pipe end during tightening.
Used during the creation of new hydraulic installations.
Suitability for repairs and modernization of rigid pipelines.
Ability to complete the connection from appropriately selected components.

Technical specification

Parameter	Value
Name	Intermediate sleeve FI25
Size	FI25
Pipe outer diameter	25 mm
Connection type	Flared
Intended use	Steel hydraulic pipes
Function	Flare support and interaction with the nut
Application	Pipe connections in power hydraulics

Frequently Asked Questions (FAQ)

Which pipe does the FI25 intermediate sleeve fit?

The FI25 sleeve is designed for flared connections of steel pipes with an outer diameter of 25 mm. The compatibility of wall thickness and connector design should also be checked.