Valmet Flowrox SKW DN50-600, Installation Maintenance And Operating Instructions

Page: 41 / 53

13
4SK70EN - 5/2023
4.3 Valve installation
At least the following must be ensured before valve
installation:
• The pipeline is isolated from the process and there is no
pressure in it.
• The pipeline is empty, clean, and cooled down.
• The pipeline flanges are parallel, concentric and with
correct distance.
• The flange connection bolts size is correct. See Table 6.
• The valve is in OPEN position.
Follow these Installation steps:
1. Disconnect automatic actuator from power supply if
connected.
2. Install the safety guards and required accessories to the
valve
3. Lift the valve on place with appropriate lifting
equipment.
4. Tighten the flange connection bolts evenly in a crosswise
sequence shown in Figure 9. Recommended tightening
torque is shown in Table 6.
5. Other than mentioned flange drillings are also available.
Always support DN250 (10") and larger automatically
actuated valves (Support for automatically actuated valves.).
6. Connect automatic actuator to power supply.
7. Connect flushing connection (if applicable).
8. Check that all connections have been fastened and the
actuator is installed correctly.
9. Run a few open/close cycles without pressure in the
pipeline.
For an electric actuator, close the valve manually
halfway then operate electrically to ensure that the
wiring is done properly.
10. Refer to Troubleshooting if the valve does not operate
smoothly or without extra force.
Table 6. Valve connection maximum tightening torque
and bolt nominal diameter for steel flanges.
Valve size
(DN)
Recommended
tightening
torque for
flange bolt
Nm (ft-lbs)
Tapped hole
depth in
body
(mm)
DIN
Bolt
nominal
diameter
ANSI150
Bolt nominal
diameter
50 (2”) 43 (32) 12 M16
5/8”-11
UNC
80 (3”) 43 (32) 14 M16
5/8”-11
UNC
100 (4”) 43 (32) 14 M16
5/8”-11
UNC
150 (6”) 75 (55) 16 M20
3/4”-10
UNC
200 (8”) 75 (55) 23 M20
3/4”-10
UNC
250 (10”) 120 (90) 23 M20 7/8”-9 UNC
300 (12”) 120 (90) 24 M20 7/8”-9 UNC
350 (14”) 185 (135) 24 M20 1”-8 UNC
400 (16”) 185 (135) 30 M24 1”-8 UNC
450 (18”) 260 (190) 28 M24
1-1/8”-7
UNC
500 (20”) 260 (190) 42 M24
1-1/8”-7
UNC
600 (24”) 260 (190) 42 M27
1-1/4”-7
UNC
Figure 9. Flange bolt tightening example.