Service Work; Replacing Gaskets - Samson 3281 Mounting And Operating Instructions

Servicing
9.4 Service work
Î Before performing any service work,
preparations must be made to the control
valve (see section 9.2).
Î After all service work is completed, check
the control valve before putting it back
into operation (see 'Testing the installed
valve' in the 'Installation' section).
9.4.1

Replacing gaskets

NOTICE
!
Risk of control valve damage due to
incorrect servicing.
Î The gaskets can only be replaced when
all the following conditions are met:
− The valve size is ≤DN 150.
− The valve does not have a balanced
plug.
− The valve does not have a bellows
seal.
− The valve does not have an insulating
section.
Î To replace the gaskets in other valve ver-
sions, contact our after-sales service.
The following gaskets are installed and must
be exchanged:
− Body gasket (17)
− Shims 0.5 mm (64)
− Shims 2 mm (65)
− Graphite fiber packing (67)
9-6
Note
Measure how many shims (64, 65) are re-
quired (see section 9.4.4).
1. Undo the body nuts (14) gradually in a
crisscross pattern.
2. Lift the bonnet (2), yoke (3) and plug
with plug stem (5) off the body (1).
3. Remove the gaskets (17, 64, 65) and
graphite fiber packing (67). Carefully
clean the sealing faces in the valve body
(1), on the bonnet (2) and clamping ele-
ment (63).
4. Insert a new gasket (17) into the body.
5. Place the new graphite fiber packing
(67) on the clamping element (63).
6. Place the new shims (64, 65) on the
graphite fiber packing. For this purpose,
measure how many shims are required
as described in section 9.4.4.
7. Make sure that the flow divider (62) is
still clamped correctly on the seat (4).
8. Place the bonnet (2) together with the
plug stem and plug (5) onto the body.
Version with V-port plug: place the bon-
net (2) onto the valve body, making sure
that the largest V-shaped port of the
V-port plug faces towards the valve out-
let.
Version with perforated plug: place the
bonnet (2) onto the valve body, making
sure that the hole of the plug that releas-
es the flow first faces toward the valve
outlet.
EB 8251 EN