Samson 3296, Mounting And Operating Instructions

Page: 76 / 100

9-18 EB 8074 EN
Servicing
Table 9-3: Selecting the shims
NPS Height T Tolerance Ideal height t
total
No. of shims
½ to 1
6.1 – ∆H H2
actual
–0.1 1
1½
2
3
4
6
12.1 –∆H –H2
actual_total
–0.1 2
8
Selecting the shims
t
total
is the height of the required shims.
1. Calculate the height t
total
based on the
previously determined values (see Table
9-1 and Table 9-2) and enter it into Ta-
ble 9-3.
2. Insert shims (125). See section 9.4.2.
Use only one shim and one gasket to com-
pensate for the height difference in valves up
to NPS 4. Install two shims and two gaskets
in alternating order in valves larger than
NPS 6.
Note
124
1
126
125
124
1
126
125
NPS ½ to 4
NPS 6 to 8
1 Body
124 Seat retainer
125 Spacer ring
126 Seat retainer gasket
Fig. 9-10: Shims