inlet has been redesigned and the effective inlet
area enlarged. As a result of this redesign, the
maximum feeding capacity and throughput
has been increased. An increase of up to 15% is
possible, especially for smaller sizes. This increase
in capacity is achieved with keeping consistently
good operating conditions (minimum number of
cut grains and smooth running).
Also the noise caused by leakage gas expansion,
which is the main source of noise in high-pressure
rotary valves (up to 3.5 bar differential pressure),
has been reduced considerably by a new design
of the expansion opening. Furthermore, the
transformation of the elongated opening to
a pipe connection was integrated in the cast.
An additional consequence of the reduction
in noise emission is that an adapter piece is no
longer required. The ZV valve also now has a pipe
connection that meets the standard.
The Finite Element Method (FEM) was used to
calculate the cast housing, which optimized its
rigidity while reducing the mass at the same time.
This allows a narrow gap between the rotary valve
and the housing, with the advantage of a low gas
leakage rate when operating the new ZV pellet
rotary valve.
9
TN November 2016