Determining The Number Of Shims Required - Samson 3281 Mounting And Operating Instructions

Servicing
See relevant information under 'Mount-
ing the actuator onto the valve' in the 'In-
stallation' section.
17. Press the plug (5) firmly into the seat (4),
while fastening down the bonnet (2) with
the body nuts (14). Tighten the nuts
gradually in a crisscross pattern. Ob-
serve tightening torques.
18. Screw in the threaded bushing (8) and
tighten it. Observe tightening torques.
19. Place yoke (3) on the bonnet (2) and fas-
ten using the castellated nut (92).
20. Loosely screw the lock nut (10) and stem
connector nut (9) onto the plug stem.
9.4.4 Determining the number
of shims required
Determine the number of shims required ev-
ery time the bonnet (2) is opened. Two dif-
ferent shim sizes are available:
− Shims 0.5 mm (64)
− Shims 2 mm (65)
Table 9-1: Dimensions for graphite fiber packing
Dimension
S
mm
P
mm
Note
The dimension P is the height of the double-layered graphite fiber packing (67) in the com-
pressed state.
9-12
Up to DN 100
4
1.8
After inserting the new gasket (17) as de-
scribed in section 9.4.1, proceed as follows:
1. Determine dimension A.
2. Determine dimension B.
3. Refer to Table 9-1 for dimensions P and
S.
4. Calculate dimension X:
X = (A + P – B) – 2 * S
5. Fill out dimension x with the sufficient
number of shims (64/65) up to
+0.5 mm.
6. If dimension X ≥ dimension S, insert an
additional graphite fiber packing (67).
DN 125 to 250
8
3
DN 300
10
3.5
EB 8251 EN