
2500-249 Controllers and Transmitters
D200037X012
Product Bulletin
34.2:2500
July 2012
13
Figure 7. Schematic of Reverse‐Acting Fisher 2503R Controller
B04466‐E
A2546‐1
SWITCHING POINT
ADJUSTMENT
EXHAUST PORT OF
BOURDON TUBE VALVE
(OPEN FOR RELEASE
OF LOADING PRESSURE)
SUPPLY END OF
RELAY VALVE
SMALL
DIAPHRAGM
LARGE
DIAPHRAGM
INNER BOURDON
TUBE CHANNEL
OUTER BOURDON
TUBE CHANNEL
SUPPLY PORT OF THREE‐WAY
BOURDON TUBE VALVE
FLAPPER
EXHAUST END
OF RELAY VALVE
SUPPLY PRESSURE
OUTPUT PRESSURE
NOZZLE PRESSURE
Figure 8. Optional Heat Insulator Assembly
W0630‐2
TORQUE TUBE
ARM
TORQUE TUBE
SHAFT
EXTENSION
TORQUE TUBE
SHAFT
SHAFT
COUPLING
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