Dental Suction Systems Explained: Wet-Ring vs Dry

Suction installation depends on the pump, separation system and the clinic's services. Confirm these before shipping so that water, waste, pipework and electrical connections are ready when the equipment arrives.

Confirm the pump and separation arrangement

A liquid-ring pump and a wet suction pipe system describe different aspects of an installation. Confirm the actual pump, separator and water circuit on the manufacturer's diagram rather than relying on the label alone.

	Liquid-ring pump	Dry-air suction arrangement
How it works	Liquid forms the pump seal; confirm how aspirate is separated and discharged	A separator removes liquid before air reaches the pump
Water use	Confirm the seal-water supply, any recirculation system and refill requirements	Check pump water requirements separately; cleaning and wastewater handling still need planning
Purchase price	Compare the complete installed system	Include the separator, pipework and any required accessories
Site requirements	Check water, reservoir and drain requirements for the specific model	Check separator location, liquid discharge and pump installation requirements
Plumbing	Use the manufacturer's installation diagram	Use the manufacturer's installation diagram; a dry pump alone does not establish drain compatibility

Mobile, single-chair or central

• Mobile suction unit — a wheeled system with collection arrangements that vary by model. Confirm whether fixed connections are required, how reservoirs are filled and emptied, and the permitted operating cycle.
• Single-chair suction — a compact pump under or beside the unit.
• Central suction — a pump and separation system serving several treatment units through a pipe network. Size it for the specified simultaneous users, airflow, vacuum and pipe layout.

Five things to confirm before shipping

1. Hose diameters on the chair side (saliva ejector and high-volume evacuator).
2. Whether the unit ships with a saliva ejector only, or with a high-volume evacuator as well.
3. The permitted liquid discharge route, drain dimensions and separator location.
4. Water supply or reservoir requirements, refill/emptying instructions and permitted continuous operating time.
5. Amalgam separator requirement in the destination country.

Ask VOTEN to confirm the selected system's pump type, flow and vacuum test conditions, simultaneous-user rating, water circuit and hose/drain configuration in the quotation and installation instructions. See the suction range or request an installation specification.

Reference: Dürr Dental V and VS systems illustrate dry-air and centrally separated wet suction arrangements. Installation requirements for a VOTEN model must come from that model's documentation.