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6.2 Maintenance · Replacing
parts
See Fig. 1 on page 7.
The regulator is subject to natural wear. De-
pending on the operating conditions and du-
ration of operation, regularly check the regu-
lator's ability to function.
In case the downstream pressure rises, for
example, when all the consumers are closed,
and the valve does not shut off tightly
enough. This may happen when the tight
shut-off is impaired by either dirt or natural
wear on the seat and plug. However, it is im-
portant to take into account that a maximum
leakage of 0.05 % of the K
cient in the case of metal-seated plugs and
0.01 % in the case of soft-seated plugs is still
permissible (refer to section 9 on
page 26).
6.3 Replacing the plug
Types 2371-10/-11 · Replacing the plug
The plug (3) is screwed into the plug support
(3.1) and can only be removed through the
inlet port. Use the appropriate socket wrench
to unscrew the plug.
How to proceed:
1. Loosen the plug using the socket wrench
− DN 15 to 25 (NPS ½ to 1): width across
flats 10
DN 32 to 50 (NPS 1¼ to 2): width
across flats 13
EB 2640 EN
or C
coeffi-
VS
V
Cleaning and maintenance
2. Unscrew the plug (3) through the inlet
port p
. Remove the two washers and the
1
seal.
3. Prior to installing a new plug: Check the
seat and seat facing, so far as it is possi-
ble, for damage. In case of damage, the
regulator must be replaced or repaired.
3.1
3
Input p
1
Cutaway model · Unscrewing or screwing in the plug
with a socket wrench
3
Screwed-in plug (3), plug support (3.1) seal
and washers
Fig. 9: Replacing the plug of Type 2371-11
Socket wrench
3.1
19
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