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Servicing
9.1 Preparing the valve for
service work
1. Lay out the necessary material and tools
to have them ready for the service work.
2. Put the regulator out of operation (see
the 'Decommissioning' section).
Tip
We recommend removing the regulator from
the pipeline before performing any service
work (see the 'Removing the regulator from
the pipeline' section).
The following service work can be per-
formed after preparation is completed:
− Clean and exchange the seat and plug
(see section 9.3.1)
− Replace the operating bellows (see sec-
tion 9.3.2)
− Replace the set point spring (see sec-
tion 9.3.3)
9.2 Installing the regulator
after service work
Î Put the regulator back into operation (see
the 'Start-up' section). Make sure the re-
quirements and conditions for start-up or
putting the valve back into operation are
met.
9.3 Service work
Î Before performing any service work,
preparations must be made to the regu-
lator (see section 9.1).
9-4
Î After all service work is completed, check
the regulator before putting it back into
operation (see the 'Testing the regulator'
section).
9.3.1
Cleaning and ex-
changing the seat and
plug
NOTICE
!
Risk of damage to the facing of the seat
and plug due to incorrect service or repair.
Always replace both the seat and plug.
Î See Fig. 9-1
Disassembly
1. Completely relieve the tension from the
set point spring (7) by turning the set
point adjuster/set point screw (8/9)
counterclockwise ().
2. Unscrew the screws (10).
3. Remove the seal (1.1).
4. Remove the spring housing with set point
spring (7) and operating bellows (5).
5. DN 15 to 25
Use the plug wrench
plug (2).
DN 32 to 50
Use the plug wrench
plug nipple with plug (2).
6. Remove the seal (1.2).
7. Thoroughly clean the seat and plug. If
the plug or balancing bellows is dam-
to unscrew the
1)
to unscrew the
1)
EB 2626-2 EN
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