Replacing valve plug seal, Maintenance – Flowserve HV 205 User Manual

Page 18

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Replacing valve plug seal

The valve head can be removed directly inside the tank. This option is highly
recommended since in this case the bottom valves, the connecting lines and the hydraulic
system do not require any additional preparation.

If, however, the valve head can only be removed from the outside, please proceed as
follows:
See drawings on pages 4, 6 and 1 9

First disconnect all connections

of the actuating cylinder

. A small amount of oil

might escape. Collect the oil and dispose of it correctly.

If possible separate the manifold from the body.

To remove the body and the actuating cylinder

unscrew the 6 hexagon-head cap

screws

of the body and remove the body and the associated actuating cylinder

together. Remove gasket

Undo the 12 socket-head cap screws

and take the valve head from the mounting

flange. For this purpose you can screw three hexagon-head cap screws M 12 into
the three through threads of the seat flange. Note that these screws are not scope of
the supply. Remove gasket

To remove the valve head proceed as follows:
Drawing see page 19

Screw valve plug

and spring plate

together in order to secure the preloaded

compression spring

. For this purpose screw a hexagon-head cap screw M 12

together with its associated washer (to ISO 7089-12) into the stem of the valve
plug

. Note that neither the screw nor the washer are scope of the supply.

Then unscrew the six hexagon-head cap screws

with the locking washers

out

of the stay bolt

. Take the valve plug

together with the spring plate

and the

compression spring

out of the seat flange

Then remove the retaining ring

and the washer

Unscrew the four socket-head cap screws

, take out the washer

and remove the

valve plug seal

Carefully clean all removed and dismantled parts.

Warning

Any use of naked flames is expressly forbidden!

Before perfomring any service work inside the tank make sure that the
tank is sufficiently ventilated and all gases have been completely vented.
The rules concerning MAC (= maximum allowable concentration) values
at place of work must be strictly applied!