Roots vacuum pumps RUVAC, which are also called Roots blowers, are rotary plunger type pumps where two symmetrically shaped impellors rotate in opposite directions inside the pump housing.
Roots pumps are use where great volumes have to be pumped. In combination with backing pumps, which compress against the atmosphere, these pumps are capable of improving the attainable ultimate pressure of a pump system by a factor of 10. With two Roots vacuum pump stages and a corresponding backing pump it is possible to attain pressures in the range down to 10-5 mbar (0.75•10-5 Torr). Regarding the motor concept RUVAC pumps are offered in different models.
The series RUVAC WA Roots vacuum pumps are provided with directly flange-mounted air-cooled standard three phase motors. The oiled radial sealing rings of the RUVAC WA for sealing the shaft against the atmosphere are made of FPM (FKM) (fluor polymer). Roots vacuum pumps of the series RUVAC WAU are provided with an additional integrated pressure equalization line and a differential pressure valve. Pumps from these series are supplied with a vertical pumping action as standard.
The series RUVAC WS Roots vacuum pumps are driven by a air or water cooled canned motor. The available frequency converters have been matched to the pump so that the possibility of mechanically overloading it is excluded. In the case of a pressure difference which is too high, the rotational speed of the pump is automatically reduced until its load. Roots vacuum pumps of the series RUVAC WSU are provided with an additional integrated pressure equalization line and a differential pressure valve. Pumps from these series are supplied with a vertical pumping action as standard.
The RUVAC WH / WHU series is equipped with a hermetically sealed motor without shaft seals and with an integrated water cooling facility. Moreover, it is provided with a purge gas option qualifying it for pumping corrosive and toxic gases. The RUVAC WHU types are equipped with an integrated bypass line incorporating a newly developed control flap. Thus the pumps can be started at atmospheric pressure and the pump down times in short cycle …