... anti-return oil valve, start convenient Rotary Vane Vacuum Pump Description of rotary vane vacuum pumpThis series pump is used ... , chemicals, pharmaceuticals, universities and other departments.Main features of rotary vane vacuum pump1. Small size, light weight, low noise2. ... with anti-return oil valve, start convenientTechnical parameters of rotary vane vacuum pump Type2XZ-12XZ-22XZ-4Pumping speed(L/ ...