Samson 3291, Translation Of Original Instructions

Page: 75 / 96

EB 8072 EN 9-19
Servicing
9.4.6 Tightening the body nuts
Risk of valve damage due to excessively
high or low tightening torques.
Observe the specified torques when tighten-
ing control valve components. Excessive
tightening torques lead to parts wearing out
more quickly. Parts that are too loose may
cause leakage.
Î
Observe the specified tightening torques
(
u
AB 0100).
It is not enough to just tighten the body nuts
(14) once as the gasket (126) underneath
the shim (125) yields. On tightening the
body nuts on the bonnet (2) or insulating
section (21), proceed as follows:
1. Tighten the body nuts gradually in a
crisscross pattern (applying half of the
specified tightening torque).
2. Tighten the body nuts in a crisscross pat -
tern several times until no further rotary
motion occurs.
3. Tighten the body nuts gradually in a
crisscross pattern (applying 75 % of the
specified tightening torque).
4. Tighten the body nuts in a clockwise pat -
tern with the full tightening torque.
2
1
3
4
5
6
7
8
Fig. 9-11: Sequence to be followed to tighten
the body nuts
NOTICE !