Maintenance – Flowserve HV 205 User Manual

Page 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 2 2

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

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.

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.

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.

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

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.