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I'm sure there's a proper name for these things...but you know the type of hose clamps that you loosen by squeezing with pliers? Do they have any advantage in certain applications over clamps that tighten with a screw drive? The reason I ask the question is that they are the ones used for the hose connections on the W210 duovalve. But they strike me as something of a pain to get on and off in such a tight space....my inclination, if I every replace a duovalve again, is to use screw drive clamps.

Second, my understanding from a GM engineer, is the wide use of constant tension clamps is two fold. The ease of installation during production and most importantly, is because of the wide use of plastic cooling parts.

The plastic necks tend to expand and contract ever so slightly during normal engine operations. With a fixed clamping worm drive clamp, the plastic neck cannot expand or contract, and this will lead to stress and fatigue in the plastic.

With the constant tension clamp, it will allow for this expansion and contraction while providing enough clamping force for the hose. Constant tension clamps hardly wear out and can be reused many times, unless damage from the removal process.

The biggest mistake that most people make is to replace these clamps on plastic necks with a worm drive clamp.

I really do think the use of worm drive clamps is the reason we saw many neck failures in the past on our w123s. This is reason I switched over to constant tension bands on the radiator side.

First off you need the proper tool to remove the "Constant Tension Clamp or Band" aka spring clamp. Pliers are not the best tool for them. There are a few versions of this tool, one that is like a plier, the other is a cable type to allow you reach tight places. They both lock onto the clamp and allow to easy removal and installation.Second, my understanding from a GM engineer, is the wide use of constant tension clamps is two fold. The ease of installation during production and most importantly, is because of the wide use of plastic cooling parts.The plastic necks tend to expand and contract ever so slightly during normal engine operations. With a fixed clamping worm drive clamp, the plastic neck cannot expand or contract, and this will lead to stress and fatigue in the plastic.With the constant tension clamp, it will allow for this expansion and contraction while providing enough clamping force for the hose. Constant tension clamps hardly wear out and can be reused many times, unless damage from the removal process.The biggest mistake that most people make is to replace these clamps on plastic necks with a worm drive clamp.I really do think the use of worm drive clamps is the reason we saw many neck failures in the past on our w123s. This is reason I switched over to constant tension bands on the radiator side.

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Last edited by DeliveryValve; 05-13- at

03:57 PM

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Tension clamps. Pluses and features

Wedge type tension clamp H3 anchor clamp is designed for fastening and holding in a taut state of self-supporting round cables with a diameter of up to 6 mm. The main application of the clamp is when laying communication lines along the lighting poles with the distance between the poles up to 50 m. Made of durable plastic, resistant to UV radiation and temperature extremes. The fastening loop made of galvanized steel wire 5 mm can be removed if necessary, which provides additional ease of installation. The movable wedges of the clamp are protected from accidental falling out by a special lock.

Anchor-type tension clamp is designed for quick installation of self-supporting optical cables with circular cross-section from 5 to 7 mm, as well as ADSS cables.
The product is capable of providing reliable clamping and high-quality fixing of cable products without the need to disconnect or expose the carrying cable.

The simplicity of the design of the clamp, designed for the device of overhead communication lines, allows it to be reliably installed on lighting poles with a span of up to 50 meters. The product is fixed with a loop to staples, hooks and traverses of various types.

The clamp is compatible with cable products also presented on our website. The clamp is made in the form of a molded body made of high-quality plastic with increased resistance to low temperatures, equipped with self-adjusting polymer wedges, capable of clamping the bearing elements without breaking the insulation. The tension clamp H3 does not require the use of tools when performing installation work.

Clamps advantages:

&#; maintaining a long service life;
&#; resistance to direct sunlight, moisture and temperature extremes;
&#; secure retention of the cable;
&#; simple installation without the use of professional equipment; fast fastening (the cable clamp is fastened twice as fast as wedge and extruded fittings;
&#; low weight of parts; the presence of a protective coating on the metal.

Another advantage that professionals like is the ability to not damage the cable. Therefore, you should definitely pay attention to this type of clamp before you conduct communication lines.
On our website you can purchase the clamp you need, as well as any other accessory for easy installation of the transmission line. We describe in detail all the characteristics of the products, and we also guarantee 100% quality. Just write to us and we will advise you.

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