DUKER 304 Kullanım Talimatları Kılavuzu - Sayfa 5

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4. Installation into the pipeline

For installation and operation of the hydrants consider the DVGW Leaflet W 331!

When installing the hydrant with the factory-provided flange gasket, the flange bolts should be tightening

with a max. torque of 70 Nm.

5. Description

5.1. Protection against pressurised water

Düker hydrants series 304/305 are equipped with the proven, automatic working protection against

pressurised water.

When opening the hydrant (main obturator), the pressurised water will flow into the hydrant only after the

draining outlet of the hydrant is safely closed.

When closing the hydrant, the drainage outlet will only be re-opened after the main obturator is safely

closed.

This construction avoids the flow of pressurised water through the drainage outlet, and residual water

remaining in the hydrant can be drained without problems into the surrounding soil. In order to ensure a

permanently safe and unhindered drainage, we recommend the use of drainage packages.

The underground fire hydrants Type 304 / 305 are designed to supply a minimum flow of 110 m³ per hour,

at an internal pressure loss of 1 bar.

The maximum allowable water flow velocity is 4 m/ s.

The residual rest water is lower than 80 cm

Connecting flange: DN 80 according to EN 1092-2

Soil covers: 0.80 m – 1.00 m – 1.25 m – 1.50 m

Factory test pressure: 24 bar

If the hydrant Type 305 (with double obturator) is used for supplying water in the pipeline, the maximum

flow velocity should not surpass 0.5 m/s (150 l/min.)

5.3. Flow values

01/042017

Düker GmbH, www.dueker.de