... the rotor, avoided the pulsation and noise produced by old blower. The silencer equipped uses advanced sound absorption materials and ... special structure, also can low the noise of blower. Roots blower can operate stably, has no vibration. Our company use ... no leakage, increased the volume efficiency. Roots blower has long use life. Blower gear uses 20 CrMnTi, after carburizing treatment and ...