Samson EB 20a, Mounting And Operating Instructions

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3-4
EB 20a_EN
May 2022 edition
Subject to technical changes
Design and principle of operation
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Place the preassembled stuf fi ng box lower section and above
the ball stem onto the provided recess in the assembled body
halves.
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Insert the thrust ring (8) into the stuf fi ng box lower section so
that it lies on the V-ring packing (7).
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Insert the set of spring washer (9), distance bushing (20) and
the set of spring washers (21). The arrangement and quantity
of the spring washers can be found on the drawing, see Fig-
ure 3-1.
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Position the thrust ring (22).
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Prepare the stuf fi ng box upper section (25) for assembly and
push in the bearing bushing (10) as well as the V-ring pack-
ing (23).
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Insert the o-ring (24) into the provided groove in the stuf fi ng
box upper section.
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Place the preassembled stuf fi ng box upper section onto the
assembled stuf fi ng box lower section (19).
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Insert the screws (26).
To ensure that the stuf fi ng box upper section can be tightened
with screws, it must be preloaded for this assembly step.
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Push an assembly sleeve over the ball stem up to the stuf fi ng
box upper section.
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Screw a nut onto the ball stem
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Screw a stuf fi ng box upper section and lower section and
screws (26) into the threaded holes of the body (1).
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Tighten the screws (26) completely.
The stuf fi ng box upper section and lower section centre them-
selves and create a unit with the two body halves.
3.5.2 Assembly of the DIN ball valve,
DN
| 150 ... 200
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Place both body halves (1a and 1b) 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.
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Drive the pin (29) into the base body (1).
Ö
Insert the seal rings (3a and 3b) in the body halves (1a and
1b).
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 the manufacturer.
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The further assembly procedure depends on the respective ver-
sion.
First the ball valve in a “standard version” will be described, and
then the ball valve with a “double stuf
fi ng box”.
3.5.1.2 Final assembly of the ball valve in
the “standard version”
Ö
Press the thrust ring (8) over the ball stem into the corre-
sponding position in the body.
Ö
Place the set of spring washers (9) over the ball stem onto the
thrust ring. The arrangement and quantity of the spring
washers can be found on the drawing, see Figure 3-1.
Ö
Insert the bearing bushing (10) into the stuf fi ng box fl ange
(11).
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Place the pre-assembled stuf fi ng box fl ange on the body and
adjust with screws (12).
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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 screws (4) on the body halves (1a and 1b).
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
After approx. 24 hours, retighten the screws (4) on the body
halves.
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 (12) on the stuff-
ing box (11).
Make sure to tighten the screws fi rmly.
3.5.1.3 Final assembly of the ball valve with
“double stuf
fi ng box”
Ö
Insert the o-ring (18) into the stuf fi ng box lower section (14).
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