Valve With Extension Bonnet Or Metal Bellows Seal - Samson 3241-7 Mounting And Operating Instructions

5.2 Valve with extension bonnet
or metal bellows seal
5.2.1 Stuffing box packing
1. Remove the stem connector nut and lock
nut (6.1 and 6.2) from the plug stem ex-
tension (6.3). Unscrew the threaded
bushing (5.2) out of the stuffing box.
2. Remove nuts (5.4) and carefully lift the
bonnet (5) over the plug stem extension.
3. Pull all stuffing box parts out of the pack-
ing chamber using a suitable tool.
Replace damaged parts. Clean packing
chamber thoroughly.
4. Remove the gasket (5.5) in the interme-
diate piece (12) and carefully clean the
sealing faces.
5. Apply lubricant (order no. 8150-0111)
to all the packing parts and the plug
stem (6).
6. Insert new gasket (5.5) in the intermedi-
ate piece. Carefully place the bonnet
over the plug stem extension onto the
bonnet and secure with nuts (5.4).
7. Carefully slide the stuffing box parts over
the plug stem extension into the packing
chamber. Make sure to keep the proper
order. Screw in the threaded bushing
(5.2) and tighten.
8. Loosely screw the lock nut (6.2) and stem
connector nut (6.1) onto the plug stem.
9. Mount the actuator and adjust the upper
and lower bench range values as de-
scribed in section 2.1.
Maintenance – Replacing parts
5.2.2 Plug
When exchanging the plug, check the pack-
ing (4.2) or, preferably, replace it as de-
scribed in section 5.2.1.
Nominal sizes DN 15 to DN 150: To un-
screw the plug (6) from the plug stem exten-
sion (6.3), screw two nuts onto the protrud-
ing thread of the extension to hold the plug
stem extension in place.
Caution!
To prevent damage to the version with the
bellows seal (no bellows in the version with
extension bonnet), make sure no torque is
transmitted to the bellows, which is con-
nected to the intermediate piece. We recom-
mend you to use a clamping tool (see
EB 029 EN).
1. Remove the nuts (1.1).
2. Remove the intermediate piece (12) to-
gether with the plug stem extension, plug
stem and plug from the valve body.
3. Remove gasket (1.2) and carefully clean
the sealing faces in the valve body and
on the intermediate piece.
4. Use an appropriate wrench to hold the
nuts stationary, which are screwed onto
the plug stem extension. Clamp the plug
stem using a suitable tool and screw it
out of the plug stem extension.
Caution! Do not twist the plug stem ex-
tension with the welded-on bellows!
5. Apply lubricant (order no. 8150-0111)
to the end of the plug stem (6) of the
new or old, reworked plug (3).
13
EB 8015 EN