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3.
Venting
Procedure:
Slowly open the inlet gate valve on the inlet side until water flows into the valve. The valve fills with water
and the air escapes through the open vent holes.
When all the air has been expelled by venting the valve in the control line, re-tighten the threaded pin. Check
that all the screw connections are properly sealed, and re-tighten if necessary.
Slowly open the inlet gate valve completely.
Check: If the shut-off gate valve on the outlet side is slightly opened, the valve should close or remain
closed. Then close the shut-off gate valve again.
If the valve does not close, the commissioning procedure must be repeated from the previous chapter.
Particular care must then be taken to ensure that the upper valve chamber and control lines are properly
vented.
4.
Adjustments
Prepare the valve according to Chapters 2 and 3. The gate valves on the inlet and outlet side are closed.
Procedure:
•
Slowly open the ball valve (2C)
•
Gradually and slowly open the gate valve on the outlet side.
•
Slowly turn the hand wheel of the control valve (6) to the left until the valve opens (audible sound of
water flowing).
•
Check the inlet pressure on the pressure gauge.
•
Gradually turn the hand wheel of the control valve (6) (½ turn) according to the table below.
Note:
Wait for the hydraulic system to stabilise between each half turn of the hand wheel. If the required relief
pressure has been set, tighten the screw on the hand wheel of the control valve (6).
Spring
Marking
type
Standard
NONE
yellow
Strong
blue
Weak
-5-
Pressure
Regulating
change for 1
pressure
turn [bar]
1.5 – 12bar
0.4
10 - 22bar
0.9
0.2 – 5bar
0.08
Number of
spindle turns
for p = 1bar
2.5
1.1
12.6
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