ARI Armaturen PREDU 700 EN - Manual (Page 14)

Page 2-14 Rev. 0040701000 1714
Operating and installation instructions
PREDU
®
The operation is then as follows:
- If present open the valve in the control line.
- Open the valve behind the pressure reducing valve
- Now open the valve in front of the pressure reducing valve (medium must flow).
- Slacken spring by turning adjusting plate (pos. 17) to the left, pressure reducer closes.
- Now pre-tension spring by turning adjusting plate (pos. 17) to the right (size 19 spanner)
until the desired downstream pressure is obtained (for possible downstream pressure see
type plate on actuator), if downstream pressure is too high, slacken spring by turning
adjusting plate (pos. 17) to the left.
- Now the pressure reducing valve is ready for use.
7.0 Care and maintenance
Maintenance and maintenance-intervals have to be defined by the operator according to
the requirements.
8.0 Troubleshooting
In the event of malfunction or faulty operating performance check that the installation and
adjustment work has been carried out and completed in accordance with these Operating
Instructions.
If malfunctions cannot be eliminate with the help of the following table
“9.0 Troubleshooting table”, the supplier or manufacturer should be consulted.
-
ATTENTION !
- Squashing of finger between the spring coils and in the area of the pin in the
head piece when the valve lift is moving.
- When in use high flow noise can occur.
ATTENTION !
It is essential that the safety regulations are observed when identifying faults.