Samson EB 20b, Монтаж и эксплуатация

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3-4
EB 20b_EN
February 2022 edition
Subject to technical changes
Design and principle of operation
Ö
Tighten the screws evenly in a criss-cross pattern until a gap
between 1 - 2 mm has formed between the stuf
fi ng box
fl ange and the body.
The fi nal screw connection of the stuf fi ng box is performed dur-
ing a subsequent assembly step.
Ö
Tighten the nuts (11) on the body sections (1 and 2).
For the tightening sequence and tightening torques of the respec-
tive nominal sizes, see Figure 15.1 and Table 15.1 in Chapter
“15.1.1 Tightening torques”.
Ö
To complete the assembly, tighten the screws (9) on the stuff-
ing box (6) evenly and in a criss-cross pattern.
Prior to the leak test, actuate the valve a few times so that the ball
can centre on the seal rings and provide an optimal seal.
3.5.2 Assembly of the DIN ball valve, DN | 25
... 100
3.5.2.1 Preassembly of the ball valve
Ö
Place the base body (1) with the fl ange facing downward on
an even and clean work surface, so that the inside of the ball
valve is easy to reach.
Ö
Insert the seal ring (4a) into the base body.
The seal rings may not be installed without clearance. To achieve
the tightness of the ball valve, the seal rings must be installed in
their seat with suf
fi cient clearance. If this is not possible, please
contact PFEIFFER.
Preassembly of the ball valve with the one-part ball/switching
shaft
Ö
Insert the ball (3) with the shaft tilted into the packing space.
The nominal size bore of the ball faces the same direction as the
base body bore while being inserted.
For further assembly, see Chapter “3.5.2.2 Final assembly of the
ball valve”.
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Preassembly of the ball valve with the two-part ball/switching
shaft
Ö
Insert the switching shaft (20) tilted into the packing space.
Ö
Insert the ball (3) such that the slit in the ball sits perfectly on
the dihedron of the switching shaft (20).
The nominal size bore of the ball is transverse to the base body
bore while being inserted.
For further assembly, see Chapter “3.5.2.2 Final assembly of the
ball valve”.
3.5.2.2 Final assembly of the ball valve
Ö
Place the body (2) with the fl ange facing downward on an
even and clean work surface, so that the inside of the ball
valve is easy to reach.
Ö
Insert the seal ring (4b) into the body.
The seal rings may not be installed without clearance. To achieve
the tightness of the ball valve, the seal rings must be installed in
their seat with suf
fi cient clearance. If this is not possible, please
contact PFEIFFER.
Ö
Place the body (2) with the preassembled seal ring (4b) on
the base body (1) and push together carefully.
Ö
Turn the body (2) such that the bores in both body halves (1
and 2) lie above each other.
Ö
Push the washer (12) over the lightly lubricated screws (10)
and adjust the body halves (1 and 2).
Ö
Place the washers (12) over the screw ends and tighten hand-
tight with nuts (11).
− Depending on the nominal size, stud bolts with nuts or screws
can be used.
− The fi nal screw connection of the body halves is performed dur-
ing a subsequent assembly step.
Ö
Clamp the ball valve in a vice for further assembly with the
base body
fl ange (1).
Damage to the fl ange due to improper handling!
Ö
Do not damage the housing fl ange, especially the sealing
surfaces.
Ö
Center the ball shaft (3) in the packing area with the V-ring
packing bottom ring (5).
Ö
Push the bottom ring to the oval body base.
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