Service Work; Replacing The Gasket - Samson EB 8015 EN Mounting And Operating Instructions

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

NOTICE
!
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 ≤DN 150.
− The valve does not have a balanced
plug.
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 flange (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 flange (2).
4. Insert a new gasket (17) into the body.
5. Place the flange (2) onto the body.
EB 8015 EN
Version with V-port plug: place the
flange (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
flange (2) onto the valve body, making
sure that the hole of the plug that releas-
es the flow first 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 flange (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) with valve
bonnet (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 insulating section (21).
4. Insert a new gasket (17) into the body.
5. Place the insulating section (21) with
valve bonnet (2) and plug with plug stem
(5) onto the body.
Version with V-port plug: place the as-
sembly onto the valve body, making sure
Servicing
9-9