The 3000-series is one of the most popular air inlet valves of TPI-Polytechniek. The concept is similar to the 145 series, but the capacity is much higher. This air inlet valve has its flange on the front and is available with a curved or straight inner flap. The flap of the inlet can be bottom hinged or middle hinged. The 3000 series is always equipped with a central control arm. The longer control length of the central arm makes exact adjustment of the inlet more precise. In 2017 the 3000-VFG-C is improved on several crucial points.

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