The Vibration Pump

The vibration pump was launched in the early 70’s by Ulka Co. Since it is much less expensive than a rotary pump, espresso makers for home-use became more affordable.

The vibration pump has an output of 15bars, which can be reduced to 9-10bars with the aid of an expansion valve. The pressure builds with the aid of the coffee grounds in the portafilter and is established slower than with a rotary pump. For this reason, it is very important to find the perfect grind and to use the right amount of coffee grounds. If one of these parameters are not correct, the right amount of pressure will not be reached.

This pump vibrates and swings and is louder than a rotary pump. Therefore, the machine housing is insulted in order to provide soundproofing.