Trap primerSeal

Backflow preventers valves are devices that are installed prevent contamination of the potable water supply due to back-siphonage or backpressure from substances that are substances that are hazardous.

Because the SV1/TP does not rely on pressure drops, it is able to maintain trap seal even when the building is unoccupied.

Mechanical trap primers work when other plumbing fixtures, such as a basin tap, are operated thus initiating a pressure drop in the supply line.  The inherent failure of these types of devices to provide the necessary seal, is because the area where trap dry-out is most likely is where taps and valves are not being used anyway.

Trap PrimerValve

20 Carr Road, Three Kings Auckland, New Zealand PO Box 27-555, Mt Roskill Auckland 1440 Ph: +64 9 624 1115sales@macdonaldindustries.co.nz

DCs offer protection against non-health hazards whereas RPZs offer maximum backflow protection for hazardous substances.

Where floor, sink or shower wastes or gully traps are infrequently used due to remote location or where high ambient temperatures or high airflow movements are likely to cause excessive trap dry-out, the MacDonald Model SV1/TP should be installed.

Trap primerfor floor drain

The MacDonald SV1/TP electronic timer controlled trap primer is designed to maintain a permanent trap seal in floor wastes.

PipingNow offers both Reduced Pressure Principle Backflow Preventer (RPZ) and Double Check Backflow Valve Preventers (DC).