Flowserve HV 205 - Manual (Page 21)

21
Maintenance
– continued –
Mounting bottom valve HWV 205 / 1 - DN 80
- continued -
After the valve head install the body with the actuating cylinder.
See drawings on pages 4 and 22
1. Re-attach manifold to the body if it was previously detached from the body so that
the bottom valve
could be removed.
To connect the manifold it might be necessary to remove the actuating cylinder
from the body. For this purpose unscrew the hexagon-head cap screws and
carefully push the actuating cylinder with your hands downwards.
Remove gasket . Do not re-use this gasket! Insert a new gasket .
2. Check the torque (50 Nm) required for tightening the hexagon-head cap screws .
If the actuating cylinder has been removed, tighten the hexagon-head cap
screws with a torque of 50Nm. Apply a commerically available lubricant to the
screws and tighten them in several steps in diagonally opposite pairs.
3. Then check the lift of the push rod in the body with actuating cylinder . For this
purpose measure the reference dimension 2 and 3 (see page 22) from the upper
edge of the push rod
to the sealing surface of the unloaded bellows and to the
lower stop of the bellows . If the distance exceeds the admissible tolerance, check
the push rod for smooth operation. If the push rod is jammed, first eliminate the
cause and then gently knock with your hand against the push rod until it can move
freely. If you cannot find a fault please contact our Technical Services in your country,
stating the GESTRA manufacturing number.
4. Insert a new gasket in the bottom of the valve head and use the hexagon-head cap
screws to screw the body to the mounting flange, applying a torque of 120 Nm.
Apply a commerically available lubricant to the screws and tighten them in several
steps in diagonally opposite pairs.
5. Re-install the connecting lines to the connections of the actuating cylinders . Use
a spanner A. F19. Apply a torque of 40 Nm to fasten the connections .
A
D
14
D
11 11
14
D
14
9 D
9 10
10
9
9
8
22
X D
X
Attention
If welding or annealing is necessary make sure that gaskets and seals are
not damaged in the process. Check and, if necessary, clean sealing
surfaces.
Always replace gasket when removing the actuating cylinder.
The specified torques must be strictly observed.
Note: Do not use the push rod as handle!
Check the soft seals of the connections for damage. Only soft seals that
are not damaged can be used again. Replace damaged gaskets and
seals.