While the blower is starting, some pressure is generated in the space between the seat and the
movable base.
The pressure is then transported into the bellows through the control valve.
As the surface of the bottom of the bellows is larger than the seat surface and thus the force is
higher, the bellows will close within a few seconds due to the gradual pressure increase.
This will result in starting the blower with continuous load rise. The valve is open while it is not
under load.
If the valve was not open in the unloaded state, it would not be able to perform the starting valve
function.
Safety valve function
While the blower is in normal operation, i.e. after start-up, the main valve disc is closed and the
pressure in the control valve is on both sides of its cone (small ball). The force generated by
pressure against the membrane, the surface of which is larger than the surface of the small ball
contacting in the seat, is smaller than the total forces generated by the spring and by pressure
against the small ball surface in the seat. The control valve is closed.
Instruction book
AIF999999 15
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