Leybold WSU-251 PFPE Chemical Series Roots Blower Vacuum Pump, 3-Phase, 208-230/460 VAC 60 Hz NEMA Motor.Requires LVO 400 PFPE Oil. Leybold Part No. 11728 The Leybold WSU 251 WSU-251 PFPE chemical series Roots blower vacuum pumps are driven by air cooled motors. They have no shaft feedthrough to the atmosphere, thus the Leybold WSU 251 WSU-251 is particularly leak-tight. In the canned motor, rotor and stator pack are separated by a vacuum-tight can made of a nonmagnetic material. The rotor operates on the drive shaft of the pump in the vacuum, so that a shaft seal which would be subject to wear is not required. The WSU pumps are easy to operate! They include a pressure differential valve that allows them to be started at the same time as the roughing pump. In the event of an excessively high pressure difference between the flanges, the valve will open. Then a part of the pumped gas will flow through this line back to the intake flange. Therefore the pump may be switched on together with the backing pump at atmospheric pressure. This increases the pumping speed of the pump combination also at high intake pressures. These Leybold WSU 251 WSU-251 are chemical series pumps being prepare from the factory with PFPE chemical resistant LVO-400 oil. These blowers are stock items and typically can ship instantly from our warehouse and have Leybold part number 11728. The price for the pump listed is for a Leybold WSU 251 WSU-251 blower booster PFPE oil prepared vacuum pump only, backing pumps are extra. We also sell mechanical and blower vacuum pump systems. Please call (505) 872-0037 for more information. Nominal Pumping Speed 304 m3h-1, 179 ft3min-1 (CFM)Maximum Pumping Speed with Backing Pump - ExampleLeybold D65BCS: 251.0 m3h-1, 148 ft3min-1 (CFM)Ultimate Total Pressure<8 X 10-4 mbar, <6 X 10-4 Torr Rotational speed60 Hz supply (3600 rpm)Max. permissible pressure difference during continuous operation0 - 80 mBar, 0 – 60 TorrConnection FlangeDN 63 ISO-KElectrical supply voltage3-phase, 60 Hz, 208 - 230 VAC / 460 VAC

NEW Leybold WSU-501 PFPE Chemical Series Roots Blower Vacuum Pump. 3-Phase, 208-230/460 VAC 60 Hz NEMA Motor.Requires LVO 400 PFPE Oil, LV PN 11738 The Leybold WSU 501 WSU-501 PFPE chemical series Roots blower vacuum pumps are driven by air cooled motors. They have no shaft feedthrough to the atmosphere, thus the Leybold WSU 501 WSU-501 is particularly leaktight. In the canned motor, rotor and stator pack are separated by a vacuum-tight can made of a nonmagnetic material. The rotor operates on the drive shaft of the pump in the vacuum, so that a shaft seal which would be subject to wear is not required. The WSU pumps are easy to operate! They include a pressure differential valve that allows them to be started at the same time as the roughing pump. In the event of an excessively high pressure difference between the flanges, the valve will open. Then a part of the pumped gas will flow through this line back to the intake flange. Therefore the pump may be switched on together with the backing pump at atmospheric pressure. This increases the pumping speed of the pump combination also at high intake pressures. These Leybold WSU 501 WSU-501 are chemical series pumps being prepare from the factory with PFPE chemical resistant LVO-400 oil. These blowers are stock items and typically can ship instantly from our warehouse and have Leybold part number 11738. The price for the pump listed is for a Leybold WSU 501 WSU-501 blower booster PFPE oil prepared vacuum pump only, backing pumps are extra. We also sell mechanical and blower vacuum pump systems. Please call (505) 872-0037 for more information. Nominal Pumping Speed 606 m3h-1, 357 ft3min-1 (CFM)Maximum Pumping Speed with Backing Pump - ExampleLeybold SV200: 530 m3h-1, 312 ft3min-1 (CFM)Ultimate Total Pressure<8 X 10-4 mbar, <6 X 10-4 Torr Rotational speed60 Hz supply (3600 rpm)Max. permissible pressure difference during continuous operation0 - 80 mBar, 0 – 60 TorrConnection FlangeDN 63 ISO-KElectrical supply voltage3-phase, 60 Hz, 208 - 230 VAC / 460 VAC