Hoses fail for one main reason: fatigue. After 8-12 million cycles, the hose fails to return to round after compression. This is evidenced first by a reduction in flow, then physical deterioration of the hose.
Verderflex’ Dura pump series has several design features that provide longer hose life than our competitors. The first and most important of which is our hose construction. Verderflex’ manufacturing process allows us to put 3x more nylon reinforcing fibers into our hose. Hoses have to be compressed with hundreds and sometimes thousands of pounds of force. The force is absorbed into the hose’s reinforcing fibers, therefore since we have more fibers, we can spread that load out over a greater number of elements, thus reducing the stress per fiber and extending fatigue life. It’s remarkably simple, but we’re the only ones who do it.
Check out this short video for more details on our premium hose: http://www.youtube.com/watch?v=1znYa6L0BE8
In addition to the best hose available, the Dura pump incorporates an air-gap design, unique to Verderflex. Whereas traditional-style hose pumps flange-mount their gearboxes to the pump housing, we use a torque arm connection so that there exists a physical separation between the pump and drive. This way, all the heat that builds up in the drive does not conduct into the pump housing the way it can on traditional hose pumps.
Find out more with this video: http://www.youtube.com/watch?v=wFdesvoUCFw
The Dura pump hose is a little different than our traditional VF pump series hose. The wall is about 25% thinner. This means we can use less compression force to occlude the hose. Less compression force = less stress = longer fatigue life. Also we gave up a little discharge pressure capability, but we can still hit 175 psi continuous.
Two more quick points: The Dura pump rotor profile provides a more gradual compression of the hose lessening the effects of fatigue, and lastly the Dura hose is about 30% shorter than VF-series, so there is less stretching and elongation which can lead to wear and fatigue.
Don’t forget – we can replace hoses and lube in most top hose pump brands.