The 2S cutting ring couplings are designed to meet the requirements for easy assembly while offering high level of operating safety. The special cutting ring geometry produces firm seating of the cutting ring with the first, strong cutting edge, while the following second cutting edge provides for additional safety.

The VOSS spring effect with added safety elastically compensates all settling phenomenon of the materials.

VOSS 2S cutting ring couplings are especially well-suited for use under higher vibration strains and flexural fatigue loads.
 

With ES-4, VOSS Fluid offers a soft seal coupling that is both reliable and economical.

ES-4 provides the greatest possible security against leaks in the case of sudden pressure increases and vibrations.

With ES-4 the gap between the normal 2S cutting ring coupling and the 10° flared coupling or the weld nipple coupling is filled.

ES-4, the cutting ring coupling with 4-fold benefits:

1. The basis is the proven VOSS 2S cutting ring
2. Additional precision sealing with soft sealing elements of FPM / FKM (e. g. Viton®, registered trademark of DuPont) in the secondary area
3. Reliable freedom from leaks with gap-free chambering of the soft seals
4. Guided assembly up to the tightening limit

VOSS taper couplings are based on the proven principle of the 24° taper with an O-ring. This principle offers an added safety bonus, even with high dynamic loads and vibrations.

VOSS taper couplings can be easily and reliably assembled. Due to their dimensional equivalence, they can easily also be installed in existing hydraulic tubing where previously cutting ring couplings with adjustable directions were mounted.

The main reason for their increasing use are precision sealing, high pressure resistance, the simple, fast assembly and the mechanical robustness.

VOSS flared couplings prove their great reliability under high loads such as sudden pressure increases, vibrations and reversed bending stress. The holding function is fulfilled with the combined flare/clamping ring principle. The 10° flared angle prevents overstretching of the tube - especially with large tube wall thicknesses.

The sealing function on the connecting piece is assumed by the proven sealing head of the flared cone. On the tube connection side the sealing function is achieved with a very high surface pressure and the supporting labyrinth seal effect on the cone surface.

 

The new VOSSForm^SQR tube coupling system meets the main requirements for hydraulic connections such as:

• Safety, as the most important aspect.
• Quality, without which permanent freedom from leaks is not possible.

With its innovative design, VOSSForm^SQR is based on the proven VOSS design principles.

A contour is formed on at the end of a standard hydraulic tube in the VOSS pre-assembly machine. When a soft seal in the secondary area and the special SQR nut are added, a simple, high-quality connection for maximum loads and safety results.
 

Stainless-steel cutting ring couplings: corrosion-resistant and leak-proof

Both cutting ring systems can be fitted on VOSS standard pre-assembly devices (Note: Typical applications are the chemical industry, shipbuilding, offshore technology and industrial applications with especially demanding requirements for corrosion resistance and a long service life.
 

VOSS flange connections of the ZAKO system are designed for applications with the highest loads and especially demanding requirements for safety. They are based on the 10° flare principle and are available both in an SAE design and with a square shape. The product line encompasses the tube range from 16 to 120 mm.

To assemble the ZAKO flange connection, the ZAKO ring is pressed into the end of the tube. Various pre-assembly devices are available for this purpose.

The sealing function for the flange connection surface is assumed by the ZAKO ring plate with its integrated O-ring. On the tube side, the same sealing effect takes place as with the BV-10 flared cone by means of surface pressure and the labyrinth principle.

VOSS ZAKO flanges are designed for 250/400 bar nominal pressure and realise a 4-fold safety margin.
 

The VOSS flange couplings with a square flange connection are characterized by particularly compact outside dimensions. They are supplied in straight and elbow designs. The product range consists of the outside tube diameters from 10 to 38 mm.

Flange sealing is carried out with an elastic round sealing ring (O-ring), and the mounting connection with cheese head screws. The flange connections are designed for the connection hole patterns of leading pump manufacturers.

A particular advantage of the SAE flange couplings with an elbow design is their directional adjustability. However, the accessibility of the mounting screws must be ensured when installing the tube.

With the SAE flanges, the tubes in the small to medium dimensional range are primarily of the cutting-ring design.

However, the larger tubes are frequently welded. VOSS also offers a complete product line for this purpose. However, for cost reasons the designing engineer should always make sure the use of VOSS ZAKO flanges isn't a better alternative first.

The production of the welded connection requires both corresponding specially-trained personnel and necessitates anticorrosion treatment.
 

VOSS Non-return valves are available in a broad range of variants. For example, as non-return valves for tube installation, plug-in cartridges with a block design or as loose installation sets for use in valves or blocks.

All variants convince with the flow-promoting design and the chambered soft seal on the taper. This enables advantageous flow rates and leak-free cut-off.

• Non-return valves with a tube connection on both sides
• Non-return valves and screw-in variants
• Non-return valve plug-in cartridges
• Non-return valve inside parts installation set

Safety in a compact space

Machines with hydraulic drives used for lifting loads must be equipped with line-break protection devices. This is understandable, as otherwise a pressure drop in the hydraulic system would lead to unchecked lowering of the load. In the past, this safety component was installed in the hydraulic system as an additional component.

Typical applications for this safety component include mobile work machines such as forklift trucks, elevating platforms, excavators, wheel bearings etc. VOSS produces the line-break protection devices in four standard connection sizes (G 1/4, G 3/8, G 1/2 and G 3/4). The threaded studs comply with shape E, DIN 3852 Part 11.

VOSS shuttle valves are used as automatic gates within a closed hydraulic circulation system. With two blockable inlet openings and on outlet opening, the shuttle valve connects the connection A or B to the connection C of the valve depending on the existing pressure oil supply. The second side of the valve is blocked by pressure loading by means of a ball or a soft sealing sliding sleeve. The soft sealing variant can also be used in applications requiring a pressure holding function.

VOSS shuttle valves are available in two designs

• Variant with ball seat (metallic-sealing)
• Variant with sliding sleeve (soft-sealing)

A special focus of VOSS lies on the development of customer-related system solutions which, for example, in the valve segment range from modifications, additional functional details or the special combination of units all the way up to new developments.
 

The Type 80N2 manual pre-assembly device consists of a hand-pump pressure unit with a working piston and a pushing head. For assembly, one tool set is required per tube outside diameter. The assembly is carried out with pumping movements of the assembly lever. The Type 80N2 assembly device also supports the correct pre-assembly result with a pressure gauge.

The following can be pre-assembled:

• VOSS ES-4 cutting rings for a 6 - 42 mm outside tube diameter
• VOSS 2S cutting rings for a 6 - 42 mm outside tube diameter
• VOSS BV-10 flared cones for a 6 - 42 mm outside tube diameter
• All other cutting rings in accordance with the valid standards (DIN EN ISO 8434-1)

 

With the Type 85 pre-assembly device, ZAKO rings of the ZAKO flared flanges for an outside tube diameter from 38 to 120 mm can be pre-assembled.

Assembly is simple and fast. The pre-assembly process is carried out electrohydraulically with high precision and ensures reliably prepared flanged connections. The Type 85 pre-assembly device consists of the assembly cylinder with a pre-flanged assembly head and a separate electrohydraulic pump unit. The maximum operating pressure is 700 bar - a continuous operating pressure of 560 bar is permissible. For pre-assembly, one clamping jaw is required per tube outside diameter.

The VOSS Type 86 E pre-assembly device is a further development of the Type 80N2 manual pre-assembly device. The device is driven with an electrohydraulic unit. The pre-assembly process is triggered with a hand switch. Actuation with a foot switch is also possible on request.

With the VOSS Type 86 E pre-assembly device, 10° flared cones and cutting rings can be assembled even more quickly.

As an alternative to the electrohydraulic drive, a drive with a pneumatic pump is also possible (Type 86 P). The Type 86 P requires a compressed-air connection of 3 to 8 bar and has an air requirement of approx. 560 l/min.

The Type 100 pre-assembly device can be operated wherever an electrical connection with 400 V AC/16 A/50 Hz/4.0 kW is available. The device is equipped with a forming force of 100 t and has a weight of approx. 450 kg.
 

With the Type 120 pre-assembly device, the ZAKO rings of the ZAKO flared flanges for an outside tube diameter from 50 to 120 mm can be pre-assembled. Assembly is simple and fast. The pre-assembly process is carried out electrohydraulically with high precision and ensures reliably prepared flanged connections.

The Type 120 pre-assembly device can be operated wherever an electrical connection with 400 V AC/16 A/50 Hz/2.7 kW is available. To connect the machine, a 3.5 m long cable with a 5-pin CEE plug is provided.

VOSS test technology is a logical addition to VOSS tube couplings. A comprehensive range of measuring couplings, coupling elements and measuring hoses is suitable both for use within the tube system and directly on control and working devices. Soft seals at the coupling and connection points ensure reliable sealing.