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2625 and 2625NS Volume Booster
January 2015
6 . Install the diaphragm assembly (key 5) onto the upper valve (key 7C).
7 . Install the diaphragm spacer (key 2) onto the body (key 1).
8 . Place a straight edge at least 5 inches (127 mm) long across the diaphragm spacer (key 2). The upper surface of the
diaphragm assembly (key 5) should coincide with the upper surface of the diaphragm spacer (key 2). If not, loosen
the hex nut (key 7E) and raise or lower the upper valve (key 7C) accordingly. Remove the valve assembly
(key 7) to loosen the hex nut (key 7E).
9 . Repeat steps 4 through 8 until the upper surface of the diaphragm assembly (key 5) coincides with the upper
surface of the diaphragm spacer (key 2).
Note
To ensure proper operation of the bypass restriction, make certain that the holes in the diaphragm and the bypass restriction are in
line with the holes in the diaphragm spacer (key 2).
10 . Make sure the O‐rings (key 14) are installed in the diaphragm spacer (key 2) and coated with lubricant (key 21).
11 . Install the upper diaphragm (key 6).
12 . Install the spring case assembly (key 3) on the upper diaphragm (key 6). Make sure the spring seat (key 9) and upper
spring (key 8) are installed in the spring case assembly. Press on the bottom of the spring seat with your finger. If
the spring seat does not move freely in the spring case assembly, remove the spring seat, apply lubricant (key 23),
and reinstall in the spring case assembly.
CAUTION
To avoid damage to the diaphragms, do not overtighten the screws.
13 . Replace the six cap screws (key 15) and tighten them in a crisscross manner.
Installation of Diagnostic Connections
See figure 2 for part names and order of installation.
1 . Before you assemble the pipe nipple, pipe tee, pipe bushings, actuator piping, and connector body, apply sealant to
all threads.
2 . Turn the pipe tee to position the connector body and body protector for easy access when doing diagnostic testing.
10
Instruction Manual
D100348X012
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