DUKER 304 Manuale di istruzioni per l'uso - Pagina 13

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9. Assembling of the obturator linkage



Insert the new spare linkage (Pos. 1) in the body (Pos. 3). Watch out that the wings of the guide

piece (Pos. 1.2), with unequal thickness, fit into the corresponding notches in the body (Pos. 3).

This ensures the safe function of the drainage system.



Turn the guide piece (Pos. 1) for approx. 30° in clockwise direction till the wings of the guide (Pos.

1.2) are positioned directly over the guide notches of the body.



Place safety ring (Pos. 14) to close the body openings.



Fix the O-Ring (Pos.13) with some spots of lubricant (for potable water) in the corresponding groove

of the bonnet.



Screw the stem-bonnet-unit clockwise in the guide piece (Pos. 1.2) until the bonnet is in contact with

the guide piece. Fix this bonnet position with the help of longer screws M16x75 or similar. Be sure

that the screws are well fixed in the thread holes of the body.



Turn stem (Pos. 6.1) anti-clockwise, to press the obturator in the body seat. Then turn the stem

clockwise till the bonnet (Pos.4) contacts either the body (Type 304) or the guide piece (Type 305).

During this work please watch out for the correct placement of the O-Ring (Pos. 13).



Replace the longer helping screws alternately with the original screws (Pos.8). Make sure that during

the exchange one screw is always safely in place and holds the bonnet in position.

The original screws shall be tightened with 75 Nm.



Check the proper function and flush the hydrant, to bring out potential dirt, stones or similar.

01/042017

Düker GmbH, www.dueker.de