Eight different pump sizes encompass the new Dolphin LS Series of liquid-ring vacuum pumps. The single-stage liquid-ring vacuum pumps in block construction achieve ultimate pressures of 33 mbar, and have suction capacities over the range of 25 to 455 m3/h. All pumps of this new generation are fitted with stainless-steel impellers, and completely stainless-steel versions are available in the 75–220-m3/h pump sizes. When combined with a gas ejector, ultimate pressures down to 8 mbar are reached. — Dr.-Ing. K. Busch GmbH, Maulburg, Germany