Vacuum Catalogue - Edwards

Liquid Ring Vacuum Pumps500400Suction Capacity (m 3 /hr) Dry Air300200Stage 1Stage 2Liquid ring vacuum pumps continue to provide the optimum solutionfor many rough vacuum applications in the chemical and alliedprocess industries. The general reliability, low maintenancerequirements, low vibration and noise levels coupled with the uniquecapabilities when handling wet gases all contribute to the popularityof the pump.Operating RangeLiquid ring pumps are suitable for continuous operation on vacuumapplications at any suction pressure down to 30 mbar A. Standardperformance data is based upon 15 °C water as the seal liquid, lowerpressures may be possible with alternative sealing liquid.A wide range of capacities are offered from two basic pumpconfigurations, single and two stages.Liquid Ring Vacuum Pump Range3000025000Liquid Ring Pump Range10000Comparison of Single and two stage performanceMaterials of ConstructionThe standard construction material is cast iron with either aspheroidal graphite or bronze impeller depending upon the series.One of the main features of the liquid ring pump is the availability ofvarious alternative materials of construction. The main options arestainless steel, aluminium bronze, and duplex stainless steels. Somepump sizes, which are particularly suited to the pharmaceuticalindustry, are also available in hastelloy.For details on material availability please contact your local salesoffice.How It Works13040 60Suction Pressure (mbar A)80 100210Page396Suction Capacity (m 3 /h)2000015000100001 Stage8350002 Stage033 40 60 100 200 500 1000Inlet Pressure mbar AThe single stage range is capable of operation at 30 mbar A whererequired, but is most suited to applications with continuous operationat inlet pressures from atmospheric down to 100 mbar A. Thesmallest pump in the range is a 25 m 3 h -1 close coupled model whilethe largest has a nominal capacity of 30000 m 3 h -1 .The two-stage range is most effective on applications with continuousoperation below 100 mbar A and has models from 50 up to5000 m 3 h -1 . Detailed performance data is shown on the followingpages.71 Suction 5 Sealing ring2 Discharge 6 Direction of rotation3 Discharge port 7 Suction port4 Casting 8 ImpellerThe impeller is mounted eccentrically to the axis of the pump casing,the liquid ring circulates concentrically within the axis of the casing.Process gases are drawn through the inlet port into the impeller cellswhere the gas is compressed and discharged through the dischargeport. The seal liquid which forms the liquid ring is supplied at apressure equal to the discharge pressure of the pump, which allowsthe pump to automatically make up the amount of liquid which isdischarged through the discharge port, therefore removing the heatof compression from the pump.654Shop online at www.edwardsvacuum.com