TPi November 2017

Fi t t ings , valves & f langes

An alternative to ferrule fittings for enhanced process security

The high surface finish quality of the forming reduces the risk of leaks: even small surface defects on the tube are levelled out. The nut and coupling body are matched so that when the nut is tightened the sealing surfaces are pressed together tightly. The mechanical shaping of the tube contour follows the principle of guided assembly. In contrast to ferrule fittings, users of VossLok40 can tighten the nut with a tightening torque wrench in a manner that nearly completely excludes over- and under-assembly. VossLok40 meets the sealing requirements in the sector of the CNG R110 application and complies with all relevant tests in accordance with DIN EN ISO 19879. Voss Fluid GmbH – Germany www.voss.de

wide variety of structural shapes such as angle, T- or L-couplings. The coupling components are fabricated from stainless steel as standard but are also available in special materials on request. Stainless steel 1.4571 and steel E235/ E355, aluminium and CuNiFe (copper- nickel alloys) are suitable as tube materials. As with other forming systems from Voss Fluid, VossLok40 is made out of three components: a conical sealing and retaining contour that is formed onto a tube end; a VossLok40 nut that is silver-plated as standard; and a VossLok40 coupling body. The mechanic shapes the cone structure at the end of the connection tube with the VossLok40 forming machine. During this process, the material on the tube surface is compressed and smoothed on the sealing radius.

With the newly developed VossLok40 tube coupling system, Voss offers users of 40° ferrule fittings an alternative. The system is based on the principle of tube forming established in hydraulics. With VossLok40 the company is transferring its experience with forming systems for hydraulic connections into sectors that normally use ferrules. Benefits of VossLok40 include reliable process security and tight connections. The range of applications of VossLok40 is highly diversified: chemical industry, the energy sector, process technology and the automotive sector. The pure metal-sealing forming system ensures precise sealing at nominal pressures of up to 700 bar and temperatures down to -40°C. It is suitable for tubes with an outside diameter of 6 to 22mm. The VossLok40 system comprises a

The new VossLok40 tube coupling system from Voss Fluid Photo credit: Voss Fluid

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TUBE PRODUCTS INTERNATIONAL November 2017

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