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Pressure & Vacuum Pump Comparison

Pressure & Vacuum Pump Comparison

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Pressure & Vacuum Pump Comparison
	Rocker 300	Rocker 400	Rocker 600	Gast	Chemker 300 PTFE	Chemker 400 PTFE
Weight:	11 lbs (5 Kg)	14 lb (6.2 Kg)	18 lb (8.6 Kg)	20 lb (9 Kg)	16 lb (7.2Kg)	14 lb (6.2 Kg)
Horse Power:	1/8 HP	1/6 HP	1/4 HP	1/8 HP	1/8 HP	1/6 HP
Max Vacuum:	25" Hg	25" Hg	25" Hg	25" Hg	25" Hg	25" Hg
Max Pressure:	80 psi	80 psi	80 psi	60 psi	25 psi	30 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)	25 LPM (0.84 CFM)	38 LPM (1.3 CFM)
Noise:	50 dB	50 dB	50 dB	68 dB	52 dB	50 dB
Chemical Resistance:	Low	Low	Low	Low	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

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