untitled table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:9.00pt "Arial", sans-serif; } .font1 { font:6.00pt "Impact", sans-serif; } .font2 { font:7.00pt "Lucida Sans Unicode", sans-serif; } .font3 { font:13.00pt "Lucida Sans Unicode", sans-serif; } .font4 { font:33.00pt "Lucida Sans Unicode", sans-serif; } BOOSTER General dtails on the BOOSTERS The BOOSTERS belong to the group of positive displacement delivery pumps. Two symmetrical pistons having en eight feature, housed in the pump body, rotate in opposite directions with no contact neither between each other nor with the pump body, meshing continuously. The pistons are driven by a set of gears with synchronised rotation, which guarantees friction-free movement. Applications The BOOSTERS have a wide range of applications in the field of vacuum. They are prefe-rably used in combination with a primary vacuum pump (rotary vane vacuum pumps, etc..) and have a very extensive application in the field of low vacuum. The use of BOOSTERS, forming a group with primary pumps, being especially recommended where high pumping speeds at low pressure are required. Operating principles During rotation, a progressively growing space is created which corresponds to the suction stage : phase 1 and 2, being gradually decreased phase 3 and 4, compressing the volume of gas. This cycle is repeated four times per each complete rotation of the drive shaft. Characteristics of RB21.20BP and RB22.20 BP version The built-in valve of by-pass is an unloading valve which allows communication between inlet and outlet of the BOOSTER when the acceptable maximum differential pressure is exceeded. A part of the gas flow is then recycled and the electric motor does not have an overload. The device allows simultaneously the BOOSTER and the primary pump starts-up at the atmospheric pressure and to reduce the time of pumping. This system puts also the BOOSTER safe from accidental gone up of pressure. Those pumps are provided for a vertical operation. ATEX version on request Characteristics 20.10 20.20 21.20 21.20BP 22.20 22.20BP 22.30 23.20 23.20BP 23.30 Rated suction flow m3.h-1 200 280 500 500 1000 1000 1430 2000 2000 2880 Rotation speed rpm 2850 2850 2860 2860 2895 2895 2895 2910 2510 2910 Maximum pressure difference mbar 130 80 80 80 66 50 40 while continuous operation Nominal motor power kW 0,75 1,1 2,2 2,2 4 4 4 5,5 5,5 7,5 Normal supply voltage 50 Hz V 230/400 400A Oil capacity in oil box A/B L 0,7/1,0 0,7/1,0 1,1/1,6 1,1/1,6 1,6/2,5 1,6/2,5 1,6/2,5 3,1/4,8 3,1/4,8 3,1/4,8 Oil capacity L 0,06 0,06 0,07 0,07 0,08 0,08 0,08 0,1 0,1 0,1 shaft passage seal Pump weight with motor kg 73 85 130 130 240 240 270 360 360 400 Pump weight (free shaft) kg 62 76 115 115 208 208 245 320 320 360 Type B pump references ■ RB 20.10 ■ RB 20.20 ■ RB 21.20 ■ RB 21.20 BP* ■ RB 22.20 ■ RB 22.20 BP* ■ RB 22.30 ■ RB 23.20 ■ RB 23.20 BP* ■ RB 23.30 411000 411001 411002 411052 411003 411053 411004 411005 411054 411006 * with integrated by-pass Specifications are subject to be changed without notice