What kind of vacuum pumps are available?
There are two types of vacuum pumps – air-powered or electric. Within each type there are different styles. For example, the air-powered (venturis) units can be single or multi-stage. The electric pumps can be oil-less or oil-lubricated, diaphragm, reciprocating piston, rocking piston, rotary vane, rotary screw or lobed rotor pump. Remember, if the pumps are of equal capacity, one type of pump does not give a better vacuum. Vacuum is vacuum, whether its created with a pump or sucking on a straw.
