High-pressure Roots blower are of better quality,performance and after-sale services,lower noise,less vibration High-pressure Roots ... Gear: 20CrMnTi9. Very less vibration10. Lower inlet and outlet temperature about 30°C11. Wall plate: HT20012. impeller: ... HT20015. Accessories: inlet filter, outlet silencer, expansion joint, check valve, foundation bolts, pressure gauge, relief valve. Zhangqiu ...