Positive Displacement
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 SUTORBILT POSITIVE DISPLACEMENT ROTARY BLOWER SIZE 1008  US $17,500.00
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 SUTORBILT ROTARY POSITIVE DISPLACEMENT BLOWER SIZE 1011 US $17,500.00
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 Used Thiele AF 2T B1 Two Head Positive Displacement Net US $14,500.00 |
 Waukesha positive displacement pump 220 4 US $9,100.00
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 USED ROOTS POSITIVE DISPLACEMENT BLOWER MDL 1018 RASV US $7,500.00
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 Used Roots Rotary Positive Displacement Blower Model US $6,000.00 |
 USED SUTORBILT POSITIVE DISPLACEMENT BLOWER MDL 8HV F US $4,500.00
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 Used Roots Positive Displacement Blower model 406RAM US $4,500.00 |
 PUREFLO POSITIVE DISPLACEMENT SANITARY ROTARY PUMP US $4,500.00
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 APV 3 Stainless Positive Displacement Pump Sanitary US $4,000.00 |
 USED 12X13 SUTORBILT POSITIVE DISPLACEMENT BLOWER US $3,500.00
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 USED SUTORBILT POSITIVE DISPLACEMENT BLOWER MODEL 8HF US $3,500.00
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 Waukesha Size 100 SS Positive Displacement Pump 3 x 3 US $3,200.00 |
 APV Stainless Positive Displacement Pump Sanitary US $3,000.00 |
 APV Stainless Positive Displacement Pump US $3,000.00 |
 POSITIVE DISPLACEMENT TUTHILL BLOWER MODEL 5520 17T3 US $3,000.00
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 Tuthill Positive Displacement Blower Model 3210 85L3 US $2,995.00
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 USED 10 HP ROOTS 45 U RAI POSITIVE DISPLACEMENT BLOWER US $2,950.00
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 ROOTS POSITIVE DISPLACEMENT BLOWER MODEL 412RCS V US $2,500.00
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 AMS RZ2AU Positive Displacement Sanitary FlowMeter US $2,250.00
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 USED DUROFLOW POSITIVE DISPLACEMENT BLOWER MODEL 3006 US $2,200.00
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 USED SUTORBILT POSITIVE DISPLACEMENT BLOWER MODEL 6MVB US $2,000.00
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 USED SUTORBILT POSITIVE DISPLACEMENT BLOWER MODEL 6M US $2,000.00
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 USED DUROFLOW POSITIVE DISPLACEMENT BLOWER MDL 4509 VT US $2,000.00
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 DuroFlow Positive Displacement Pump w 30HP 286T Motor US $1,599.95
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 USED DUROFLOW POSITIVE DISPLACEMENT BLOWER SIZE 45X6 US $1,500.00
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 30 HP DUROFLOW POSITIVE DISPLACEMENT BLOWER MODEL 4509 US $1,500.00
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 Waukesha Size 10 Positive Displacement Pump 15 x 15 US $1,400.00 |
 USED M D PNEUMATICS POSITIVE DISPLACEMENT BLOWER 3202 US $1,250.00
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 SUTORBILT GD POSITIVE DISPLACEMENT BLOWER 5MP US $1,250.00
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 NEW ITT BARTON F500 2 POSITIVE DISPLACEMENT METER 6 60 GPM US $1,200.00
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 SUTORBILT POSITIVE DISPLACEMENT BLOWER SIZE 5LS US $1,200.00
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 APV Reeves Variable Speed Positive Displacement Pump US $1,100.00
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 USED SUTORBILT POSITIVE DISPLACEMENT BLOWER MODEL 4HVF US $750.00
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 USED SUTORBILT POSITIVE DISPLACEMENT BLOWER MODEL 4HB US $750.00
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 2 BLACKMER POSITIVE DISPLACEMENT PUMP C S US $750.00 |
 USED SUTORBILT POSITIVE DISPLACEMENT BLOWER MODEL 3M F US $650.00
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 USED SUTORBILT POSITIVE DISPLACEMENT BLOWER SIZE 3HV US $600.00
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 15 Hp BRASS Positive Displacement Pump 3 4 x 3 4 US $500.00 |
 M D PNEUMATICS POSITIVE DISPLACEMENT BLOWER 46C 32025 US $350.00
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 OMEGA FTB 1002 Positive Displacement Flowmeter US $340.00
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Vacuum Pump Evolution
Vacuum pump works as a mechanical device that pulls away molecules and gas particles from an air tight container, and eventually leaving behind a partial vacuum. The vacuum pump invention was by Otto von Guericke way back year 1650.
The predecessor of the vacuum pump is the suction pump which was very trendy amongst the Romans at some point in the 13th Century. Double-action suction pumps were then invented in the city of Pompeii. Al Jazari and Arabic Engineer also studied the suction pump during the 13th century.
In the 17th century, more enhanced water pump were established and lead to more measureable vacuums. However, with its many explanations many still do not understood the whole process. Thus, pushing Galileo, then commissioned Duke, to investigate on the problem.
Discoveries and Breakthroughs
After Galileo’s investigation, he showed his results to other scientists as well as Gaspar Berti, who was then famed for inventing the first water barometer in Rome during year 1639. Berti’s water barometer has a vacuum above the water column. Many asked how this happened, but unfortunately, Berti himself got no answer.
Evangelista Torricelli searched the solution on the vacuum mystery. So, in the middle of the 16th century Torricelli built the very first mercury barometer and explained that the space at the top of water is a vacuum. Many people believed in Torricelli’s explanation and theory but it was Blaise Pascal who proved that the crest space was really a contained vacuum by conducting an experiment.
Nikola Tesla designed a device on the 19th century. It is a vacuum pump with Sprengel pump to create the highest degree of exhaustion.
Procedures and Limitations
Vacuum pump designs come with operational process and chambers leading to the different vacuum systems. Partial and rough vacuum could possibly be created using a positive displacement pump which will move gas load from an inlet port going to the exhaust port. This particular pump is however limited to acquiring a low power because of the mechanical process.
Various techniques can then be added to achieve a vacuum pump with optimum capacity. Most commonly, it comes in series starting from a primary fast pump down through a positive displacement pump which supports a diffusion pump.
There are numerous vacuum pump combinations depending on how much vacuum is needed. Acquiring high vacuum is quite difficult for the reason that not all materials that are exposed must be meticulously tested for pressure and capacity.
Visceral leishmaniasis/HIV co-infection in East Africa (crofsblogs)
Via the excellent blog End the Neglect, a December 8 post: Visceral
leishmaniasis/HIV co-infection in East Africa. Excerpt: Today is the last day
of the 16th International Conference on AIDS and STIs in Africa (ICASA), in
Addis Ababa, Ethiopia. Ethiopia...
Genemco's Used Waukesha 130 Positive Displacement Pump
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