The Construction
By using high quality materials and an approved sealing system, we offer distinct advantages to our customers.
No compromises were made in the selection of materials. The bodies are made from anodised aluminium, the
spools from stainless steel and the manual overrides from brass. The major advantage of HAFNER's sealing concept is the low friction.
This advantage is based on the following technical features: |
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There is no deformation of the seal during assemblage of the valve - they are allowed to move independently within the brass cage. Without air pressure there is no contact pressure and, therefore, no friction. This construction also has consequences for the seals of the valves in use. When switching a 5/2 valve, only three of the five seals are exposed to pressure and applying friction to the spool. |
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This unique sealing design means that the contact pressure, and consequently the sealing effect, increases proportionally to the air pressure. If the air pressure is low, contact pressure of the seals and friction are minimised. |
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Even when pressure is high, due to the shape of the cage, there is only the minimal contact pressure applied to the sealing rings which is necessary to seal the valve, as shown in the drawing above.
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| These features offer you: |
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High durability and extended lifetime! |
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High flow combined with compact design! |
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High reliability of the valves!
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