ProMinent DHV-U Série Manuel D'utilisation page 52

Carrying out repairs
Removing the piston seal (16):
1. Clamp the piston (10) at the piston head
(10.1) without damaging.
2. Screw out the piston guide (10.2).
3. Remove the piston seal (16).
Assembling the back pressure valve:
Assemble the back pressure valve using
a reverse sequence of steps.
Tightening torques
Threaded connection
Piston guide / piston head
DN10 / DN15
Piston guide / piston head
DN20 / DN25
Piston guide / piston head
DN32 / DN40
Housing screws tightening torque
Threaded connection
Housing screws DN10 / DN15 /
DN20 / DN25 *
Housing screws DN32 / DN40 *
* greased
Check the tightening torque of the
housing screws after 24 hours' opera‐
tion.
52
Value
3 Nm
4 Nm
5 Nm
Value
6 Nm
8 Nm