Vacuum Pump Comparison 
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| Vacuum Pump Comparison Chart |
| |
Rocker 300 |
Rocker 400 |
Rocker 600 |
Gast |
| Weight: |
11 lbs (5 Kg) |
14 lb (6.2 Kg) |
18 lb (8.6 Kg) |
20 lb (9 Kg) |
| Horse Power: |
1/8 HP |
1/6 HP |
1/4 HP |
1/8 HP |
| Max Vacuum: |
25" Hg |
25" Hg |
25" Hg |
25" Hg |
| Max Pressure: |
80 psi |
80 psi |
80 psi |
60 psi |
| Type: |
Piston, oil-free |
Piston, oil-free |
Piston, oil-free |
Diaphram, oil-free |
| Max Flow Rate: |
20 LPM (0.7 CFM) |
37 LPM (1.3 CFM) |
60 LPM (2.1 CFM) |
31 LPM (1.1 CFM) |
| Noise: |
50 dB |
50 dB |
50 dB |
68 dB |
|
Chemical Resistance: |
Low |
Low |
Low |
Low |
| Vacuum Pump Comparison Chart (cont.) |
| |
Chemker 300 Teflon |
Chemker 400 Teflon |
| Weight: |
16 lb (7.2Kg) |
14 lb (6.2 Kg) |
| Horse Power: |
1/8 HP |
1/6 HP |
| Max Vacuum: |
25" Hg |
25" Hg |
| Max Pressure: |
25 psi |
30 psi |
| Type: |
|
|
| Max Flow Rate: |
25 LPM (0.84 CFM) |
38 LPM (1.3 CFM) |
| Noise: |
52 dB |
50 dB |
|
Chemical Resistance: |
High |
High |
| Types of Vacuum Pumps |
| |
Piston |
Diaphragm |
Rotary |
| Oil Free |
Yes |
Yes |
No |
| Maintenance |
None |
None |
Yes |
| Pressure |
High |
Lower |
Very High |
| Contamination |
None |
None |
Yes |
| Noise |
Low |
Low |
High |
Piston Pump:
A connecting rod with a compression ring rises and falls in the cylinder, on the down-stroke it draws the air through the inlet valve; On the up-stroke it forces the air through the exhaust valve and out of the head.
Diaphragm Pump:
An elastomer diaphragm moving up and down.. On the down-stroke it draws the air through the inlet valve. On the up-stroke the diaphragm forces the air through the exhaust valve and out of the head