The water ring rotary vacuum pumps of RV serie are frequently used in many industrial branches using vacuum equipments, especially in lines for production of porcelain and arious constructional materials. They are also used for vacuum condensation or vacuum drying during production of various substances as well as final products in food industry (production of jams, malt extracts, dried milk, dehydrated fruit, yeast and soap). They are often used as a part of machine milking in cowsheds. The vacuum pumps also find their applications in air evacuation and flooding of pumps as well as suction lines. They can be also supplied with evacuation vessel fitted either with electrode switch or float switch. Such automatic evacuation stations are enable to control operations of main pumps in industry, water pumping works, fire water stations and water house siphons or to ensure a permanent vacuum necessary for some industrial productions. The water ring vacuum pump RV can be also used as a low pressure compressor RK reaching maximum overpressure 12 m.