3.6 Lokring connections
In case of repair on the refrigeration circuit, the cut pipe connections are restored with
the Lokring technology.
Fig.10: Structure of Lokring connection
1 Main sealing area / reduces the tube diameter by 2 %
2 Cylindrical area / reduces the tube diameter by 0.2 %
3 Lokring insertion area / facilitates the initial positioning of the Lokring on the
connecting piece
4 Cooling tube
5 Lokring
6 Tubular concreting piece
Lokring connection consists of two Lokrings (5) and a tubular connecting piece (6) for
supporting the pipe ends. With the special inside contour of the Lokring, the connecting
piece is reduced so that a hermetically sealing metal-to-metal connection is created.
There are suitable Lokring connections for all pipe dimensions.
Fig.11: Types of Lokrings
1 T-piece with Schrader valve / used if the compressor is not replaced but the
service nozzle is too short
2 NTR connection / used for repairing the point at which the capillary tube is in-
serted into the intake tube (Y-joint)
3 Reducing connection / used to connect tubes of different sections, available
along with a number of Lokring connections for special applications
4 Stopper (sealing cap) / used to block off a compressor connection prior to trans-
portation
5 NAV connection (extension) / used to extend compressor connection if it is too
short
6 Straight connections from 1.6 mm through to 13.0 mm / used for tubes of the
same diameter, aluminum or brass
In the case of connections between different metals, an electrical po-
tential is created under the influence of moisture, and this can lead to
contact corrosion in the connection.
To prevent this corrosion, an aluminium connection should be used
when making a connection in an aluminium tube. Brass is used for all
other connections. Even the connection between a steel tube and a cop-
per tube is made by means of a brass connection.
Design and function
2020-08-03_58300000002379_ara_en_p Copyright by BSH Hausgeräte GmbH Page15of73
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