Fully Refurbished Agilent Varian DS 602 Rotary Vane Pump, Three Phase, 9499336 Overview: The Agilent Varian DS602 3Ph is a dual-stage, Rotary Vane Pump oil sealed, driven by a three-phase electric motor. This vacuum pump is suitable for pumping non corrosive gases. Main features of the pump: - all parts in direct contact with the fluid pumped are free of copper alloys
- all materials are carefully selected to provide extended life
- a high capacity gas ballast device allow to pump condensable vapors
- all the parts composing the pump are fully replaceable due to the close machining tolerances and to the centering obtained by using reference pins
- due to its design features and low number of gaskets, the pump requires little maintenance, disassembly and reassemble are easy and require minimal time
The pump works with force-feed lubrication, provided by an auxiliary gear-pump driven by the rotor of the vacuum pump itself. This ensures proper lubrication even when pressures are close to atmospheric. The entire pump functional block is immersed in the oil contained in the casing. The oil guarantees perfect sealing of the discharge valves, enters the pump to ensure lubrication and sealing of the parts inside, facilitates heat dissipation and reduces pump noise. The pump is equipped with a special anti-suckback device which automatically isolates the vacuum system when the pump stops. This avoids rises in pressure or oil flow in the vacuum system while air is allowed back into the stator chambers. The air entering the pump after the anti-suckback device has closed prevents the oil in the casing from filling the stator chambers. The inner seals are achieved by the lubricating oil, thanks to the close machining tolerances. There is only one oil seal on the rotor shaft, the one preventing oil from seeping out of the pump. This seal acts on a bushing fitted onto the shaft. Simple replacement of this seal grants the rotor a practically unlimited life (pumps DS402 1Ph, DS402 3Ph, DS602 1Ph,
DS602 3Ph). On the DS102 1Ph, DS202 1Ph and DS302 1Ph pumps, this seal acts on a surface-hardened area of the shaft guaranteeing long rotor life. The vacuum pumps are connected directly to the electric motor through a flexible coupling, so that motion is transmitted even in case of poor alignment. A fan fitted on the joint and housed in the pump support produces a forced air flow over the finned surfaces of the casing to avoid oil overheating. Lubrication: The pump’s lubricating system is force-feed type. Oil circulation is obtained by means of a gear pump connected to the rotor shaft. The oil is drawn through a gauze filter to prevent any foreign bodies from entering the pump. Shunt-mounted on the delivery line is a hydraulic piston which, besides actuating the anti-suckback device (see ANTI-SUCKBACK DEVICE), also regulates pressure by discharging excess oil flow directly into the tank. The required flow of oil under pressure passes through ducts that are drilled in the walls of the pump and lubricates the bushings and the inside parts. Vacuum Seals: A special feature of this pump is the low number of gaskets that are employed. The seals in the circuit are obtained by means of VITON gaskets. The careful surface finish of the various parts of the pump means that vacuum sealing of the functional block is ensured by the film of oil separating metal surfaces. Sealing of the rotor shaft is guaranteed by a rotating gasket with dust-guard lip. The suction flange and duct are sealed by mean of OR gaskets. Gas Ballast Valve: When the pump sucks in vapors, these condense during compression and mix with the oil, forming an emulsion (an aqueous vapor, for example) or a solution (organic solvent vapors, for example). A number of problems arise from this, such as the impossibility of obtaining high vacuums, the alteration of the properties of the oil, could cause scaling on parts of the pump. To avoid this, during compression at the second stage, atmospheric air is let into the pump through an adjustable valve, or “gas ballast valve”, located at the top of the pump. In this way, the discharge valve of the second stage opens through the effect of the atmospheric air before the partial pressure of the vapor reaches saturation point, thus preventing condensation from occurring. The vapors are expelled mixed with air. Anti-Suckback Device: The pump is equipped with a special anti-suckback device to avoid air pressure rises and/or oil backflow towards the evacuated vessel when the pump is switched off. This device has a shutter which automatically closes the suction duct. In this way the pump and vacuum system are completely isolated from each other and air can enter the pump without any risk for the vacuum produced in the system. The device includes some special features, namely: - drive obtained avoiding any form of contamination of the inlet duct by fluids (oil and/or air) used to command the shutter. Thanks to this, when the pump is started again, the pumpdown to vacuum conditions is extremely fast as these contaminants are not present and no degassing is therefore required
- suction flange maintained closed even when the pump is idle, so that pollutants cannot enter from the environment and no oil can overflow from the pump
Technical Data: Free Air Displacement (l/min): 605 Pumping Speed (cfm): 18.3 Ultimate Pressure (mbar): 2 x 10-3 Rotational Speed (rpm): 1500 Inlet Flange: DN 25KF Exhaust Flange: DN 25KF Unit is fully rebuilt and comes with a FULL 3-MONTH WARRANTY! PN06698 AJVS Service and Repair Information:  Agilent Varian DS 602 Rotary Vane Pump Repair A & J Vacuum Services provides repair service for all types of High Vacuum equipment. We perform Turbomolecular Pump repair, Turbo Pump Repair, Dry Pump repair, Vacuum Pump repair, Mass Spectrometer repair, Rotary Vane Pump repair, Vacuum Booster repair, and Leak detector repair. Our highly trained technicians have years of experience and guarantee the highest quality service. Due to our confidence in the quality parts and service we guarantee 6-12 month warranty for parts and labor. We operate at our own full service repair facility in Clifton, NJ. We have invested in state-of-the-art equipment including; complete line of decontamination, cleaning, drying, balancing, vibration analysis and software to minimize failures. Our in-house machine shop is capable of machining various components, prototypes and housing conversions as needed. We support all major manufacturers including Pfeiffer Vacuum, Alcatel / Adixen, Edwards Vacuum, Varian, Oerlikon / Leybod Vacuum, Vacuubrand, and Agilent Technologies. Repair Steps - Full incoming inspection and run up time check, vibration check, drive inspection.
- Full disassembly, decontamination and cleaning.
- Pump is balanced utilizing state-of-the-art equipment from the world leader in equipment balancing and analysis to reduce noise and vibrations and extend bearings life.
- Assembly and replacement of all necessary parts such as shafts, bushings, bearings, sleeves, O-rings, gaskets, seals, wicks, etc. Only parts that meet or surpass OEM specifications are used to ensure dependable highest quality service and long pump life.
- Final test and leak check. The pump in fully assembled condition is checked for vacuum seal. Leak test to 1 x 10-9 Mbar l/s. Vibrations are analyzed and test data is digitally recorded.
Every pump and instrument is extensively tested for 48 hours. During our final tests, we monitor total pressure, temperature, vibration and noise level utilizing newest testing technologies and techniques specified by OEM. Upon request, we can provide our customers with a pump down graph. Call us for your free repair estimate at 1-973-249-0854.
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