ARI Armaturen PRESO EN - Manual (Page 9)

Rev. 0040402000 0410 Page 9
Operating and installation instructions
PRESO
®
6.1.1 Removing the cap
6.1.2 Changing the pressure range “without” spring change
- Check the spring range.
- Loosen lock nut (pos. 21).
- Turn adjusting screw (pos. 17) clockwise to increase and anticlockwise to reduce the
pressure range (alterations only by flowing media).
- Secure spring setting by tightening lock nut (pos. 21).
- Assemble cap.
6.1.3 Changing the pressure range “with” spring change
- Loosen locknut (pos. 21), turn adjusting screw (pos. 17) anticlockwise to reduce the spring
(pos. 37) force.
- Unscrew nuts (pos. 8) at flange connection and remove bonnet (pos. 11).
- Remove upper spring plate (pos. 16) and spring (pos. 37).
- Replace new spring (pos. 37) and upper spring plate (pos. 16).
- Change gaskets.
- Mount bonnet (pos. 11) with the help of a rod (refer to Fig. 3 ), the upper spring plate
(pos. 16) and spring (pos. 37) is centered to the adjusting screw (pos. 17). Then reset the
pressure range with flowing media, refer to spring range (refer to point 6.0 Putting the
valve into operation).
- Secure spring setting by tightening lock nut (pos. 21).
- Assemble cap.
ATTENTION !
By alterations, media could emerge out of the adjusting screw
(only with broken bellow)!
- Unscrew cap (pos. 30), pay attention for media emerging from the valve.
ATTENTION !
Before dismantling, the system must be made pressureless! (refer to point 10.0)
ATTENTION !
At relatively high pressures the nuts (pos. 8) on the two longer stud bolts (pos. 3)
must be removed last and simultaneously!
ATTENTION !
- Torques must be observed:
M10 16 - 25 Nm
M12 30 - 40 Nm
M16 70 - 90 Nm