Grundfos DMH 25X Installatie- En Bedieningsinstructies pagina 30
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Zie ook voor DMH 25X:
- Installatie- en bedieningsinstructies (52 pagina's) ,
- Installatie- en bedieningsinstructies (10 pagina's) ,
- Installatie- en bedieningsinstructies (14 pagina's)
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Beschikbare talen
Beschikbare talen
Warning
Risk of injury caused by squirting oil!
Oil may squirt from the oil deaeration when the pump
is running. Do not completely unscrew the oil
deaeration screw.
Wear protective clothing (gloves and goggles) when
working on the dosing head, connections or lines!
Rod length of oil dipstick: 35 mm.
Note
Immersion depth to marking: approx. 5 mm.
Check the oil level at least every two weeks and add
oil, if necessary.
Only use original Grundfos gear oil!
Note
For product numbers, see "Service kit catalogue" on
www.grundfos.com
Pump model
Version
DMH 254
Single
DMH 254
Double
DMH 255
Single
DMH 255
Double
DMH 257
Single
DMH 257
Double
After start-up
After initial start-up and after each time the
diaphragm is changed, tighten the dosing head
screws.
Caution
After approximately 6-10 operating hours or two
days, cross-tighten the dosing head screws using a
torque wrench.
Torques
Pump model
DMH 254
DMH 255
DMH 257
8.4 Setting the pressure relief valve
The pressure relief valve is set to the pressure given by the
customer, or to the rated pressure (maximum counter-pressure).
The opening pressure can be set to a lower value by the
customer.
Opening pressure of the pressure relief valve
Rated pressure of the pump
[bar]
4
10
16
25
30
Description
3.5 l DHG 68
4.5 l DHG 68
3.5 l DHG 68
4.5 l DHG 68
5.5 l DHG 68
7.5 l DHG 68
Torque
[Nm]
50-54
50-54
50-54
Opening pressure of the
pressure relief valve
[bar]
5
13
18
28
Setting the opening pressure
•
To set the operating pressure, a pressure gauge must be
installed in the discharge line and an isolating valve must be
installed after the pressure gauge.
•
To set the pressure relief valve, use a screwdriver.
Fig. 26 Setting the opening pressure
Set the pressure relief valve as follows:
1. Close the isolating valve after the pressure gauge.
2. Remove the cover (1 m) from the pressure relief valve.
3. Start the pump.
4. Using a screwdriver, slowly turn the adjusting screw (2 m) of
the pressure relief valve counter-clockwise until the desired
opening pressure is obtained.
Fig. 27 Setting the pressure relief valve
Risk of damage to the pump or system!
When blocked, the pressure relief valve does not
work properly and can produce pressures of several
Caution
hundred bar in the pump or system.
Do not block the pressure relief valve during
adjustments!
5. Replace the cover of the pressure relief valve.
6. Open the isolating valve after the pressure gauge.
1m
2m
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