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Valves/Fittings

Overflow set

Overflow valve with scale, bypass pipe, elbow gland, completely self-sealing.
Centre distance A = length, see table

For larger distances you will have to install a copper pipe 22 in the necessary length on site.
2850 and 2851: with screw connection 2 x ½" external thread
2853: with screw connection 2 x ¾", flat-sealing, suitable for foreign products


SKU
285x
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Operating data
Max. operating temperature: 110 °C
For hydronic heating installations with standard circulation pumps and thermostatic or zone valves.

The PAW differential pressure overflow valve reduces noises due to circulation and keeps the pump pressure constant, even when the flow in the radiators is reduced (particularly when thermostatic valves are used).
The valve controls the flow rate in proportion to the thermostatic or zone valves.
The return temperature is increased as soon as the valve opens.
For weather compensated control we recommend to mount the sensor to the flow line directly behind the circulation pump.
The higher return temperature guarantees that the boiler does not corrode.

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