u2-Lok Twin ferrule fittings
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About the successful certification of u2-Lok Twin Ferrule Fittings fittings by DNV · GL (Det Norske Veritas · Germanischer Lloyd), the Schwer Fittings GmbH was delighted. The very extensive type examination included the following tests: Combined pressure pulse and vibration test, repeated assembly, leak testing, vacuum testing, pull test and a burst resistance.
Description
The back ferrule affords damping of tube circuit vibrations through a spring like action. Furthermore, it prevents a carry-over of tightening torque from the coupling nut to front ferrule.
The front ferrule circumferentially seals the surface between the tube and coupling. Due to the inner taper the front ferrule is pressed into the tube so that a pressure-tight impression is formed.
Silvering of the coupling nut thread prevents seizing of the stainless steel coupling. This allows multi-use of a coupling.
A deep pipe bore, and entry taper, guarantees accurate positioning and centring of the tube.
The stainless steel u2-Lok compression wedge ring tube fittings are used in high-pressure and vacuum applications where the highest demands are placed on material and tightness. They are suitable for liquid and gaseous media. Also suitable for applications with gaseous hydrogen and certified to EC79 (H2-Lok).
Basically, the u2-Lok screw connection consists of 4 components or individual parts: The media-carrying base body (straight socket, elbow, T-piece or cross piece), the union nut and the two rings, also known as clamping and wedge rings.
The screw connections are used wherever gases and liquid media flow and where a high safety standard is required. It is also ideal for hydrogen applications.
The u2-Lok screw connections are mainly used:
- in chemical process technology
- in pharmaceutical and biotechnology
- in petroleum processing
- in offshore and shipbuilding
- in nuclear research
- in laboratories and institutes
- in vacuum technology
- for hydrogen applications (Hydrogen H2)
The new u2 fittings are designed according to its own production facilities in Europe. The semi-finished products are mostly from EU countries. Both the quality and the current pressure tests are carried out exclusively in the company's headquarters in Denkingen.
The design largely allows vibrations and pressure pulses to be absorbed, without any fear of leackage. This design, technical manufacturing, and quality properties ensure twin ferrule fittings a wide range of applications in industry, laboratory, and measurement system areas.
Even when the system is operated with high vibrations, the screw connection guarantees sufficient safety at high pressures or vacuum.
This is achieved through 4 effective design details:
- The back ferrule affords damping of tube circuit vibrations through a spring like action. Furthermore, it prevents a carry-over of tightening torque from the coupling nut to front ferrule.
- The front ferrule circumferentially seals the surface between the tube and coupling. Due to the inner taper the front ferrule is pressed into the tube so that a pressure-tight impression is formed.
- Silvering of the coupling nut thread prevents seizing of the stainless steel coupling. This allows multi-use of a coupling.
- A deep pipe bore, and entry taper, guarantees accurate positioning and centring of the tube.
On request, parts can also be supplied from Hastelloy, Titanium and other highly alloyd materials. Material certification according DIN ISO 10204, ANSI etc., available on reques. Special tests and approvals possible, if required.
Focus on details
The rear wedge ring has a very high surface hardness of up to HV 1,000. The inner cone in the socket is rolled smooth and the surface is compacted, Ra 0.4 max. The external threads are rolled/chased. The silver-plated internal threads of the union nut prevent cold welding and can therefore be easily removed.
Schwer Fittings Standard cleaning
As standard, the u2-Lok twin-ferrule fittings are supplied free of oil and grease (off) and individually packed in foil. A special multi-stage cleaning process with ultrasonic support removes oil and grease residues as well as loose particles, ensuring that the components meet the basic requirements of the industry.
When using oxygen, certain precautions must be taken to rule out the risk of fire. The cleanliness of the system plays an important role in preventing an oxygen fire. For such applications, we offer fittings in accordance with the "offO2" Schwer Fittings standard. This in-house standard defines the cleaning, assembly and packaging of stainless steel fittings in accordance with ASTM G93 Level C for all components in contact with media.
Please refer to our more detailed information on the various cleaning standards in the data sheets listed below.
Cleaning Standard off