OEM Pumps

What is an OEM pump?

OEM pumps are pumps manufactured for use inside another device and supplied as components to equipment manufacturers. This category features the ULKA vibratory pump, which is widely used in espresso and coffee machines, steam units, and similar small appliances. It serves as a spare part for technical service centers and users who wish to replace a faulty pump in a device.

Operating principle of a vibratory pump

In vibration pumps, an electromagnet moves a piston back and forth at the mains frequency. Each stroke pushes a small amount of water; check valves ensure the water moves in one direction only. This design allows high pressure to be achieved from a compact body, though flow rate is limited. For this reason, vibration pumps are a suitable solution for coffee machines, where water is forced under pressure through the coffee chamber.

Points to check when replacing

• Voltage and frequency: Values such as 230 V 50 Hz must match your appliance's power supply.
• Power: A model compatible with the wattage shown on the old pump's label must be selected.
• Connections: The inlet and outlet unions and hose connections must fit your appliance.
• Flow direction: The pump must be installed according to the arrow on the pump casing.
• Duty cycle: Vibration pumps are designed for intermittent operation; they must not be run continuously.

When carrying out the replacement, disconnect the appliance from the power supply and empty the water tank; if you are not sure the electrical connections are correct, contact a qualified technician.

Frequently asked questions

Why does the pump make noise but not pump water?

There may be air trapped in the pump, the water tank may be empty, or the check valve may be blocked by limescale.

How can limescale build-up be prevented?

Descaling at the intervals recommended by the appliance manufacturer extends the pump's service life.

Can I fit a pump with a different power rating?

This is not recommended; a pump with the power and pressure ratings matching the appliance's design values must be used.

Can this pump push water from a storage tank to a garden?

No; it is designed for small appliances. For home and garden use, see the water pumps category.

How do I find out the model of the pump?

The label on the old pump's casing contains the model, voltage, and power information.

Why is the appliance leaking after a pump replacement?

Union gaskets not seating fully or hose clamps not being tightened sufficiently can cause leaks. Check the connections when the appliance is cold and do not reuse old gaskets.

How long can a vibration pump run?

These pumps are designed for intermittent use; the operating and rest periods specified by the manufacturer must be observed.