device has been designed for self-adjusting operation and is assembled on
the suction channel.
Use of the safety valve is recommended
whenever suction is at a minimum or non-existent, as under these
conditions there could be excessive heating of the motor and the body that
would cause damage to both the motor itself and the rotating parts.
The valve allows the intake of sufficient air
for keeping the temperature within the safety limits and ensuring proper
operation of the device.