Hydraulic tube connectors DIN 2353
Hydraulic tube connectors DIN 2353
Threaded (pipe) fittings with 24° cone sealing and cutting ring are widely used in many branches of industry to connect steel pipes with outside diameter from 4 to 42 mm. Fittings according to DIN 2353 can also be used to connect flexible hose assemblies (as a body without nut and cutting ring). Manufactured according to ISO 8437-1 or DIN 2353. Used in hydraulic and pneumatic drive and control systems as well as general industrial applications.
Basic information
Material
DIN 2353 pipe fittings are supplied in two material versions::
carbon steel (zinc-plated or phosphate-coated) standard seal: NBR rubber,
stainless steel (AISI 316) standard seal: Viton
Working temperature
Allowable working temp. depends on the material of a connector and seal:
carbon steel:
from -40°C up to +120°C
carbon steel + NBR:
from -35°C up to +100°C
stainless steel:
from -35°C up to +100°C
stainless steel + Viton:
from -20°C up to +200°C
Working Pressure
The max. working pressure (nominal pressure) of DIN 2353 pipe fittings differs according to the type (light series, heavy series), size (pipe outside diameter), material and manufacturer. In the table below, data from different producers showing different types of fittings, made of carbon and stainless steel, is collected. It facilitates preliminary selection. If the required working pressure exceeds the value in the table, please contact TUBES INTERNATIONAL® Technical Department..
series pipe O.D.[mm] maximum working pressure [bar]
for connection with
cutting ring according
to PN-ISO 8434-1 for complete fitting
according to different producers
minimum maximum
LL 4 ÷ 8 100 – –
L 6 ÷ 15 250 160 400
18 ÷ 22 160 100 315
28 ÷ 42 100 100 250
S 6 ÷ 12 (14) 630 400 630
16 ÷ 25 400 250 400
30 ÷ 38 250 250 315
Nominal pressure (max working pressure) given by manufacturers is calculated within static working conditions, the safety factor of 4 for the cutting ring connection. For fittings with metal to metal seal and BANJO fittings, the safety factor varies from 1.5 to 2.5. When choosing a fitting, dynamic pressure load and vibrations in the installation should be also considered.
For temperatures above +100°C, the max. working pressure may require reduction (contact TUBES INTERNATIONAL® Technical Department).
Medium:
Pipe fittings according to DIN 2353 can be used to transfer a wide range of fluids and gases. However, the compatibility of the medium with fitting material and seal type must be always checked. For all applications different from standard hydraulic oils, please contact TUBES INTERNATIONAL® Technical Department.
Pipes used in installations
Pipes used for the construction of installations:
seamless steel precision pipes, protected against corrosion (phosphate-coated, zinc-plated), annealed,
stainless steel precision pipes, cold-drawn, free of annealing scale, heat treated (annealed).
Pipe dimensions (outside diameter, wall thickness) should be chosen according to the required flow rate and working pressure in an installation.
Operation principle of fittings with a cutting ring
A complete connection of a pipe with a hydraulic installation requires: a fitting (1), a cutting ring (2), a nut (3) and a hydraulic precision pipe (4). During assembly, sharp edges of the ring (5 and 6) bite into the pipe according to the 24° cone (7) and creating a “shoulder” (9). The pipe, cut straight at 90° angle, must be pushed firmly against the bottom of the seat (10). Otherwise, the cutting ring does not bite into the pipe deep enough to create a tight connection.
złączki hydrauliczne DIN 2353
łączniki DIN 2353 do rur hydraulicznych
before assembly after assembly
The fittings manufactured according to DIN 2353, depending on their usage and pressure, can be divided into the
following categories:
LL (extra light series) – used in small hydraulic and cooling devices, for plastic hoses, compressed air, propane,
etc.
L (light series) – used for standard applications within the working pressure of that range.
S (heavy series) – used for higher pressure, hydraulic high pressure applications such as: hammering, shipbuilding, mining, chemical industry, heavy equipment.
VOSS DIN 2353 hydraulic tube connectors
VOSS DIN 2353 threaded connection range includes cutting ring connections, soft seal connections, BV10 connections, specialist assembly tools and accessories. As standard, all products are protected against corrosion with premium zinc-nickel coating VOSS Coat (CrVI chromium-free coating). Salt spray tests conducted according to DIN EN ISO 9227 proved that the basic material withstands over 1000 hours in typical working conditions with no signs of corrosion.
Comparative test in a salt spray chamber after 720 hours.
DIN 2353 fittings
hydraulic connectors DIN 2353
standard zinc coating VOSS Coat zinc-nickel coating
Optimised construction of DIN 2353 connections
All components of VOSS connection system are perfectly matched to each other. Thus, it takes less effort to assemble the elements and they do not wear so much. Main advantages:
- reduction of a final assembly angle from 90° to 30°
- significantly less effort
- easy final assembly in limited space
- protection against excessive tightening during final assembly
- suitable for repeated assembly
An assortment of hand tools and fully automatic machines has been developed for mounting DIN 2353 VOSS connection components. To select the correct solution, please contact Tubes International.
VOSS RingM cutting ring connectionsM
VOSS RingM cutting ring allows an easy, quick and reliable connection. Improved cutting geometry ensures superb tightness. Construction reinforced in all areas exposed to high pressure impact increases stability and pressure resistance. Patented limit stop enables correct pre-assembly , prevents over-tightening or under-tightening of a connector. Cutting ring, with a very thin, yet extremely hard surface obtained via the process of surface hardening, can be used for stainless steel tubes. VOSS RingM rings are coated with black VOSS Coat as standard.
Characteristics:
- optimum hardness to bite into the tube deep enough
- high dynamic load capacity
- optimum construction for correct assembly
- slight spring-back after assembly
- suitable for carbon steel and stainless steel tubes
VOSS RingM cutting ring connectionsM
złączka DIN 2353
ES-4 cutting ring connections
A cutting ring with a moulded seal in a recess on the cone of the ring and an additional O-ring between the ring and tube (stainless steel rings have labyrinth metal seals). The seals stop all possible leaks that may sometimes occur when the metallic seal created by the ring loosens, e.g. during continuous full load operation or operation under dynamic loads. The rings are available in both carbon steel (coated with VOSS Coat, NBR sealing) and stainless steel (with FPM/FKM sealing).
Characteristics:
- additional elastomer seal ideal for dynamic loads
- reinforced ring construction can be pressed harder against 24° cone
- slight spring-back after assembly
- carbon steel and stainless steel versions available
DIN 2353 fittings sealing
ES-4 cutting ring connections
Formed end connection – VOSSFormSQR
VOSSFormSQR formed end connection is a tube end formed into a shoulder matching DIN 2353 type fittings. To obtain this uniquely shaped shoulder on the tube, a section of tube material is formed with a specially designed VOSS machine (available in Tubes International). This formed tube end has and additional elastomer seal (FPM/FKM is a standard seal material).
VOSSFormSQR connection combines the highest level of safety with exceptional quality. It withstands the most extreme dynamic loads, bending and temperature fluctuations, ensuring durable and reliable connection.
VOSSFormSQR system is available in carbon steel and stainless steel.
Characteristics:
- outstanding resistance to dynamic loads
- noticeable increase in torque during tightening
- prevents over-tightening or under-tightening of a connector
- fast connection forming process
- perfect solution for series production
- carbon steel and stainless steel versions available
hydraulic connection DIN 2353 VOSS
high pressure hydraulic fittings DIN 2353
BV-10 flared coupling connections
A system is suitable for operation under extreme loads. Resists bending moments, pressure variations, continuous maximum working pressure operation, vibrations and temperature fluctuations. BV-10 stub pipe is mounted in a tube end by pushing it in with VOSS manual device. The serrated surface of the stub pipe on the tube side prevents it from slipping out and acts as a metallic seal. The flared end of the tube is held in place by a clamping ring located in the nut.
Characteristics:
- outstanding resistance to dynamic loads
- easy assembly, even on thick-walled pipes
- compatible with all DIN 2353 connectors
- suitable for stainless steel tubes
- carbon steel and stainless steel versions available
List of products:
Carbon steel rings and nuts
Rings and nuts
Straight connectors
Angled connectors
Shape connectors
Screw-in straight connectors
Screw-in angled connectors
Carbon steel Screw-in T-connectors
Screw-in T-connectors
Screw-on connectors
Screw-on connectors
Blank plugs and caps