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add. silencer
silenziatori supp. 
air filters
filtri aria
safety valve
valvola di sicurezza
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Safety Valve

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This 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.