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Instruction Manual
Form 5300
July 2005
SPOOL VALVE ASSY
SPOOL
FLEXURE
SUMMING
BEAM ASSY
SPOOL
FLEXURE
LARGER VIEW OF
SPOOL HEAD
A6044-1/IL
Figure 30. Spool Valve and Summing Beam
2. Grasp the diaphragm connector with a wrench or
other appropriate tool and unscrew the machine
screw (key 30F) on the opposite side of the
diaphragm. Remove the diaphragm plates and
discard the diaphragm.
3. See figure 29. Position the new diaphragm
(key 30B) between the diaphragm plates (key 30C).
Be sure the diaphragm convolution is properly
oriented between the diaphragm plates. Attach the
diaphragm connector (key 30D) with the machine
screw (key 30F).
4. Position the diaphragm assembly inside the input
module housing using the alignment pins. Replace
the diaphragm cover and secure it to the input
module housing with the four machine screws (key
20).
SPOOL RELIEF
SPOOL
HEAD
CLEARANCE
0.381 - 0.762 mm
0.015 - 0.030 INCHES
SPOOL
HEAD
3710 and 3720 Positioners
Assembling the Input Module and
Summing Beam Assembly
WARNING
Refer to the WARNING at the
beginning of the Maintenance section
of this manual.
1. Position the summing beam on the input module
housing. Place the flexure over the alignment pins
extending from the summing beam and input
module. Secure the flexure by placing the two
flexure retainers over the alignment pins extending
through the flexure. Install the two machine screws
(key 20) that hold the flexure retainers.
CAUTION
Avoid damage to the diaphragm (key
30B) when installing the machine
screw (key 30E) that holds the
diaphragm connector to the summing
beam assembly. Use a wrench or other
tool to hold the diaphragm connector
while installing the machine screw.
2. Install the machine screw (key 30E) that connects
the summing beam assembly to the diaphragm
connector, taking care not to twist the diaphragm
connector and diaphragm (key 30B). Use a wrench
or other tool to hold the diaphragm connector while
installing the machine screw.
3. Inspect the one O-ring (key 31) in the positioner
base plate. Replace it, if necessary. Properly
lubricate (key 63) the O-ring.
See figure 30. Before securing the
input module and summing beam
assembly, make sure the end of the
summing beam does not come in
contact with the spool shaft. Instead,
the end of the summing beam should
engage the spool head.
4. See figure 30. Properly position the input module
and summing beam assembly on the positioner base
plate using the alignment pins on the input module. If
the spool valve (key 1) has not been removed, use
care when positioning the input module and
summing beam assembly. Make sure the spool
extending from the spool valve body properly
engages the spool flexure.
Note
35
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