Oil-Less Rotary Vacuum Pump 100% Chinan made CNC machined manufacturing ... size, light weight, low noise2. Equipped with gas ballast valve, can be a small amount of water vapor ... size, light weight, low noise2. Equipped with gas ballast valve, can be a small amount of water vapor ... , we will customize Rotary Evaporator, equipped with vacuum pump, cooling system and control system. Welcome to consulting ...