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Oil Sealed Rotary High Vacuum Structure and principle of Operation Rotary pump compress air at an intake pressure ranging from atmospheric to 0.13~1.3x10-2 Pa, exhaust directly to air, and offer excellent cost performance. There are two types of pumps: a rotary plunger vacuum pump and a sliding vane rotary vacuum pump. The rotary plunger vacuum pump (SR and SRP models) consists of a cylinder, rotor, piston, slide pin, and exhaust valve. The sliding vane rotary vacuum pump (SVC models) consists of a rotor, vane, spring and exhaust valve. Operating Principle A spcade inside the pump cylinder is created by rotation of the rotor attached to the shaft. This causes gas to enter the space in the cylinder from the suction inlet. Further rotation of the rotor transfers the gas in the space between the cylinder and piston or cylinder and vane to a compression space, and the gas is then exhausted to the oil tank through the exhaust valve. The oil used for lubrication and cooling of the pump and to maintain airtightness is fed to the inside cylinder from the side and exhausted together with the gas through the exhaust valve to the oil tank. The oil and gas are separated in the tank. Features
- Outstanding exhaust characteristics
- Easy operation and maintenance.
- Excellent durability and a long service life
- High efficiency
- Compact, low vibration operation
- Can exhaust steam without causing condensation
If condensable vaoprs such as steam condense and mix with the oil in a pump, the performance of the pump deteriorates. By using a gas ballast valve, condensable vapors are exhausted without condensing in the pump.
Basically, these are of oil-immersed, rotary vane type pumps. The rotor, with two spring loaded vanes, is mounted eccentric in the stator body. As the rotor rotate, the vanes sweep the crescent shaped air space twice, in each revolution. There is in- built non-return valve which prevents back flow of air. Manufactured from graded materials, all moving parts are precisely machined, ground and assembled with close tolerance. This results in, increased efficiency and long trouble free operation life.
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Model No.
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No.of Stages
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Free air displacement
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Ultimate vacuum mm of Hg
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Drive motor 1440 RPM H.P.
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Approx oil filling LTRS
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LTR/Min
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CFM
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LH- 50
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1
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50
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1.77
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0.05
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0.25
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2.5
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LH- 50
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2
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50
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1.77
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0.005
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0.25
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3
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LH- 100
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1
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100
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3.54
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0.05
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0.25
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3
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LH- 100
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2
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100
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3.54
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0.005
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0.5
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3
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LH- 150
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1
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150
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5.30
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0.05
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0.5
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3.5
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LH- 150
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2
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150
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5.30
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0.005
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1.0
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4
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LH- 200
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1
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200
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7.08
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0.05
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0.5
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3.5
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LH- 200
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2
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200
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7.08
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0.005
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1.00
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4
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LH- 300
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1
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300
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10.60
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0.05
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1.0
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6
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| LH- 300 |
2
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300
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10.60
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0.005
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1.5
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8
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LH- 500
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1
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500
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17.65
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0.05
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1.5
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7
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2
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500
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17.65
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0.005
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2.0
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8
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LH- 750
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1
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750
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26.50
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0.05
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2.0
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8
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2
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750
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26.50
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0.005
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3.0
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10
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LH- 1000
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1
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1000
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35.3
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0.05
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2.0
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15
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2
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1000
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35.3
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0.005
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3.0
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20
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LH- 1500
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1
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1500
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53.0
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0.05
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3.0
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20
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2
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1500
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53.0
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0.005
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5.0
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25
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LH- 2000
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1
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2000
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70.6
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0.05
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3.0
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30
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2
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2000
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70.6
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0.005
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5.0
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30
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LH- 3000
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1
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3000
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106.0
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0.1
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5.0
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35
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LH-3000
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2
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3000
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106.0
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0.05
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7.5
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40
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