Samson 3251 User Manual

EB 8052 EN 9-9
Servicing
9.4 Service work
Î Before performing any service work,
preparations must be made to the control
valve (see Chapter9.2).
Î After all service work is completed, check
the control valve before putting it back
into operation (see section 'Testing the in-
stalled valve' in the 'Installation' chap-
ter).
9.4.1 Replacing the gasket
Risk of control valve damage due to incor-
rect servicing.
Î The gasket can only be replaced when
all the following conditions are met:
− The nominal size is ≤NPS4.
− The valve does not have a balanced
plug.
− The valve does not have a ow divid-
er.
Î To replace the gasket in other valve ver-
sions, contact our after-sales service.
a) Standard version
1. Undo the body nuts (14) gradually in a
crisscross pattern.
2. Lift the ange (2) and plug with plug
stem (5) off the body (1).
3. Remove the gasket (17). Carefully clean
the sealing faces in the valve body (1)
and on the ange (2).
4. Insert a new gasket (17) into the body.
5. Place the ange (2) onto the body.
Version with V-port plug: place the
ange (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
ange (2) onto the valve body, making
sure that the hole of the plug that releas-
es the ow rst faces toward the valve
outlet.
See relevant section 'Mounting the actua-
tor onto the valve' in the 'Installation'
chapter.
6. Firmly press the plug (5) into the seat (4).
Fasten down the ange (2) with the body
nuts (14). Tighten the nuts gradually in a
crisscross pattern. Observe tightening
torques.
b) Version with insulating sec-
tion or bellows seal
1. Undo the body nuts (14) gradually in a
crisscross pattern.
2. Lift the insulating section (21) and plug
with plug stem (5) off the body (1).
3. Remove the gasket (17). Carefully clean
the sealing faces in the valve body (1)
and on the insulating section (21).
4. Insert a new gasket (17) into the body.
5. Place the insulating section (21) onto the
body.
Version with V-port plug: place the insu-
lating section (21) onto the valve body,
making sure that the largest V-shaped
NOTICE
!

Samson 3251 Specifications

General

Brand	Samson
Model	3251
Category	Control Unit
Language	English