DUKER 304 Panduan Petunjuk Pengoperasian - Halaman 12

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8. Dismantling of the obturator linkage

Note: For hydrants Type 304 (single obturator) the pipeline has to be unpressurised

before working on the obturator linkage!

For ordering the spare linkage, the necessary soil cover length of the column can be detected by the

number of the markings.



Close the gate valve in front of the hydrant (only for Type 304 with single obturator).



Close the hydrant and turn the stem back for approx. ¼ turns till the stem



Release the bonnet (Pos. 4) by removing both hexagon screws (Pos. 8).



Lift the bonnet (Pos. 4) approx. 40 mm from the hydrant body, by turning the stem anti-clockwise.



Fix the bonnet (Pos. 4) in this level by using spacers (for example wooden wedges or similar).



Turn the stem (Pos. 6.1) in clockwise direction, until the obturator linkage is pulled out of the body

seat.



Drive out the stem-bonnet-unit from the guide piece (Pos. 1.2) by turning the stem in anti-clockwise

direction.



Remove safety ring (Pos. 14) and O-Ring (Pos. 13).



Turn the obturator linkage (Pos. 3) approx. 30° anti-clockwise and pull it out.

01/042017

Düker GmbH, www.dueker.de

perceptibly strainless.