4PV72EN - 4/2022
10
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.
• The valve is in OPEN position.
1. Disconnect pneumatic actuator from the pneumatic
supply.
2. Before starting the installation of Flowrox PVEG, loosen
pipe supports from both sides of the valve.
3. Adjust the distance between the pipe flanges to be equal
to the face-to-face dimension of the Flowrox valve.
4. Lift the valve on place with appropriate lifting
equipment.
5. Tighten the flange bolts evenly in a crosswise sequence.
6. Connect pneumatic actuator to the pneumatic supply.
7. Check that all connections have been fastened and the
actuator is connected correctly.
8. Run a few open/close cycles without pressure in the
pipeline. Refer to Troubleshooting if the valve does not
operate smoothly or without extra force.
The maximum allowed torque is shown in the table. Ensure
that during tightening, the compression of the rubber flange
does not exceed the values given in the table.
Table 5.
Flange bolt torques and compression values.
VALVE SIZE
MAX TORQUE
MAX COMPRESSION
PVEG 50 (2”)
20 Nm (15 lbf-ft)
2 mm (0.08 in)
PVEG 80 - 150 (3”-6”)
30 Nm (20 lbf-ft)
3 - 5 mm (0.12 – 0.2 in)
Figure 6. Valve installation.
Part
Description
Part
Description
1
Pipe support
4
Valve body
2
Flange bolts
5
Pipeline
3
Sleeve
X
Recommended compression
Bolt/hex nut torques over 30 Nm may cause damages to
the Flowrox PVEG body. Never “pull” the whole pipeline
with flange bolts to get the flanges tight.
5 Operation
5.1 Commissioning and decommissioning
Before the valve is operated within the pipeline, ensure that
it has been installed in accordance with this manual and
applicable safety regulations.
The following must also be ensured:
• The valve is used for the purpose specified at the time of
sales
• Required accessories are installed if applicable
• Possible explosive conditions have been taken into
account
When a valve is decommissioned, dispose the valve parts and
electric/pneumatic devices (actuators) according to the local
regulations and the instructions given by the part or device
manufacturer.
Collect and dispose dangerous process media, so that people
and environment are not endangered. Follow the local
regulations.
