Consolidated 13900 Series POSRV Maintenance Manual
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© 2018 Baker Hughes, a GE company. All rights reserved.
X. Operating Principles (Contd.)
Once inlet pressure P
1
has dropped to an appropriate
predetermined value, the pilot valve will close and steam
will flow into chamber “C” and will immediately repressurize
the backside of the main disc, closing the main valve.
The backside of the main valve disc exposed to chamber “C”
has a larger area than the main seat producing an additional
force on the main seat to maintain tightness.
DRAIN
DRAIN
DRAIN
FABRICATED
STEEL DRIP
PAN SHOWN
ANCHOR DISCHARGE PIPING
SOLIDLY TO BUILDING STRUCTURE
A
DRAIN
DRAIN
A
Figure 4: Installation Piping
Figure 5: Installation Piping
Table 1: Standard Drip Pan
Valve Seat Area
Maximum
Allowable Span
(A)
in
2
cm
2
in.
m
114
735
45
1.14
143
923
62
1.58
176
1135
55
1.40
200
1290
55
1.40
