Leybold SCREWLINE SP 250 Dry Compressing Screw Vacuum Pump, PN 115-001 These Leybold SP 250 Dry Compressing Screw Vacuum Pump SCREWLINE are from the SCREWLINE SP family were developed in view of the special requirements of industrial applications. The innovative, modular design of the SCREWLINE allows these pumps to be used in all cases where reliable, compact and low maintenance vacuum technology is demanded. SCREWLINE pumps are suited for all applications with higher requirements regarding the backing pump, like for example in processes involving high particle counts or in the hard production area. The dry compressing SCREWLINE pumps are an ideal alternative to conventional oil-sealed vacuum systems. SCREW ROTORS DESIGN & FUNCTIONThe ScrewLine is a dry compressing screw-type vacuum pump capable of a maximum pumping speed of 250 m3 x h-1. It has been developed specifically for the special requirements of industrial applications. For this reason the ruggedness of the pump was a main design criterion. Screw RotorsThe screw shaped rotors are fitted to two horizontally arranged shafts and revolve without making contact within the pump chamber. The shafts are synchronized by a toothed gear. The shafts are driven via a further gear stage by an electric motor. In vacuum pumps, the seals and the bearings on the vacuum side are always a potential source for a breakdown. On the one hand lubricants may enter from the bearing into the vacuum process and on the other hand aggressive process media can endanger the bearings. Cantilevered BearingThese disadvantages are avoided by the “cantilevered” arrangement of the rotors. The ScrewLine is equipped with two cantilevered screw type rotors which are guided by oversized shafts and bearings. The bearings are both located in the gear chamber of the pump. A further advantage of the cantilevered arrangement is that the pump chamber is easily accessible without having to disassemble any bearings. Thus any possibly required cleaning operations necessary due to the influence of the process can be run easily. The cantilevered rotors minimize the risk of bearing damage and also reduce on-site maintenance to a minimum. Shaft SealsShaft seals are in the case of the ScrewLine pump only required on the delivery side of the rotors. Owing to the small pressure difference between exhaust and gear, simple and reliable seals can be provided. The two shaft seals consist of a combination of a piston ring and a labyrinth seal thus making almost no contact so that the seals will be almost free of wear. Purge GasIn standard applications no purge gas will be required at the seals. However, if demanded by the process conditions, a purge gas unit from Leybold Vacuum (P/N 119 031) may be connected. CoolingThe ScrewLine is air-cooled. A radial fan supports the cooling effect for the casing which is equipped liberally with cooling fins. Depending on requirements, the ScrewLine pumps may be combined with Roots pumps so as to attain higher pumping speeds at lower pressures. PRINCIPLES OF OPERATIONIn the ScrewLine vacuum pumps the pump chamber is formed by two synchronized displacing rotors and the housing. A pair of tightly intermeshing right-handed and left-handed threads is used to implement with only very few components a large number of stages and thus very low ultimate pressures. Gas CompressionThe screw shaped rotors are fitted to two horizontally arranged shafts and revolve without making contact within the pump chamber. The shafts are synchronized by a toothed gear. The shafts are driven via a further gear stage by an electric motor. In vacuum pumps, the seals and the bearings on the vacuum side are always a potential source for a breakdown. On the one hand lubricants may enter from the bearing into the vacuum process and on the other hand aggressive process media can endanger the bearings. SLOTSAs in the case of other dry compressing (slot sealed) vacuum pumps, also in the case of screw pumps very tight slots need to be maintained between the components. Otherwise the leaks caused by the pressure drop would have a negative effect on both pumping speed and attainable ultimate pressure. Moreover, the pump might heat itself up too much due to unfavorable thermodynamic processes. During operation the design of the ScrewLine ensures that the slots are maintained within the operational limits of the pump. In order to limit the temperatures attained by the components, the housing of the pump chamber is air-cooled. Also the rotors themselves are cooled: by oil which is pumped through bores in the rotor shafts and which also lubricates the bearings and the toothed wheels of the pump’s synchronising gear. Thus an uniform temperature spread is attained within the pump. The amount of “inner compression” has a significant influence on the temperature level within a vacuum pump. In the case of a foreline pump, most of the work on compression is done while the gas is being ejected against the delivery pressure, i.e. in the last stages of the pump. For this reason in the case of the ScrewLine the volume of the gas is already significantly reduced at pressures which are as low as possible so as to minimize this work done on compression. In this way the power requirement of the pump is reduced and less heat needs to be dissipated.

Leybold Semiconductor Vacuum Pump Exhaust silencer for SP250 / DV450/650 Screw Pumps, PN-119003V These new Leybold Semiconductor Vacuum Pump Exhaust Silencers are used to silence vacuum pump exhaust noise. They are entrirely user-servicable and are made to be mounted beneath or on the side of the pump frame.

Leybold Oil level Switch Guard For Screwline Pumps SP250 SP630 PN: EK100002086 This is the Leybold Oil level Switch Guard For Screwline Pumps SP250 and SP630.

Leybold OEM Maintenance Kit for Screwline SP 250 Dry Screw Vacuum Pumps, Includes Oil, Filter and Gasket. Leybold Part Number: EK110000820. This Leybold OEM Maintenance Kit for all Screwline SP250 dry screw vacuum pumps includes everything needed for an oil change. Leybold recommends changing the oil yearly. Keep that expensive Screwline pump working at peak efficiency by changing the oil and filter according the the manufacturer’s scheduled maintenance recommendations. This maintenance kit includes: 4 liters Leybonol LVO 210 Esther Pump oil Oil Filter Element, 10um Oil Drain Plug (2 ea) O-Ring Pump Enclosure Wrench

Leybold Maintenance Kit 1 for Screwline SP 630 and SP630F Dry Screw Vacuum Pumps, BG30, Includes Filter and Gasket. Leybold Part Number: EK110000792. This Leybold OEM BG30 Maintenance Kit 1 for the air-cooled Screwline SP630 and water-cooled SP630F includes only the filter and gasket. Oil sold separately. This model EK110000792 maintenance kit is specifically for screwline 630 pumps with serial number up to 31000197911. Please see our part number P1012430 for the maintenance kit for screwline pumps with serial numbers from 31000197912 and up. Leybold recommends changing the oil and filter at least every 20,000 hours or 2.5 years. Keep that expensive Screwline pump working at peak efficiency by changing the oil and filter according the the manufacturer’s scheduled maintenance recommendations. This maintenance kit includes: Oil Filter Element, 10um Oil Drain Plug O-Ring Gasket Pump Enclosure Wrench

Leybold Maintenance Kit 1 for Screwline SP 630 and SP630F Dry Screw Vacuum Pumps, BG30, Includes Oil, Filter and Gasket. Leybold Part Number: EK110000814. This Leybold OEM BG60 Maintenance Kit 1 for the air-cooled Screwline SP630 and water-cooled SP630F includes everything needed for an seal maintenence. This model EK110000814 maintenance kit is specifically for screwline 630 pumps with serial number from 31000197912 and up. Please see our part number P1012429 for the maintenance kit for screwline pumps with serial numbers up to 31000197911. Leybold recommends changing the oil and filter at least every 20,000 hours or 2.5 years. Keep that expensive Screwline pump working at peak efficiency by changing the oil and filter according the the manufacturer’s scheduled maintenance recommendations. This maintenance kit includes: 13 liters Leybonol LVO 210 Esther Pump oil Oil Filter Element, 10um Oil Drain Plug O-Ring Gasket Pump Enclosure Wrench

Leybold Oil Filter Element For Screwline SP 250, SP630 and SP630F Dry Screw Industrial Pumps, BG60. Leybold Part Number: E110003143. This Leybold 10um oil filter element is for all Screwline SP250 pumps, and Screwline SP630 and SP630F pumps with serial number from 31000197912 and up. Please see our part number P1012224 for a replacement oil filter element for Screwline SP630 and SP630F screwline pumps with serial numbers up to 31000197911.

Leybold Oil Filter Element For Screwline SP630 and SP630F Dry Screw Industrial Pumps, BG30. Leybold Part Number E110003131. This Leybold 10um oil filter element is for Screwline SP630 and SP630F (water-cooled) pumps with serial numbers up to 31000197911. Please see our part number P1012221 for a replacement oil filter element for Screwline SP630 and SP630F screwline pumps with serial numbers from 31000197912 and up.

Leybold SP-Guard Cable 20 meters, for SP250 - SP630 Screwline PumpsThis is a cable used to connect an SP-Guard to a Screwline pump. The SP-guard is used to monitor the pump based on factors like vibration, oil temp, level and exhaust pressure for Screwline Pumps SP250 and SP630. (For connection installation of cable see .pdf to the left at Downloads.)

Leybold SCREWLINE SP 250 Dry Compressing Screw Vacuum Pump mated with WSU-1001 RUVAC Rotary Lobe BlowerLeybold PN LAS2338 These Leybold SP 250 Dry Compressing Screw Vacuum Pumps are from the SCREWLINE SP family and were developed in view of the special requirements of industrial applications. The innovative, modular design of the SCREWLINE allows these pumps to be used in all cases where reliable, compact and low maintenance vacuum technology is demanded. SCREWLINE pumps are suited for all applications with higher requirements regarding the backing pump, like for example in processes involving high particle counts or in the hard production areas. The dry compressing SCREWLINE pumps are an ideal alternative to conventional oil-sealed vacuum systems. This SCREWLINE SP 250 dry-compression pump rated for 604 CFM peak performance. is mated with the WSU-1001 dry RUVAC rotary lobe blower backing pump. The Leybold WSU-1001 includes a pressure equalization line and differential pressure valve allowing the blower to be energized together with the SCREWLINE pump. The SP 250 includes leveling feet, 24VDC SP guard monitoring system, shaft seal purge kit, manual gas ballast, non-return valve and a standard exhaust silencer. The RUVAC blower and SCREWLINE pump will be mounted in a close-coupled arrangement with 200-208 or 265 or 460 VAC.