Emerson Fisher 2625 Manuel d'instruction - Page 10
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2625, 2625SST, and 2625NS Volume Booster
September 2022
1. Remove the six cap screws (key 15) from the perimeter of the spring case assembly (key 3) and lift off the assembly,
taking care you do not lose the upper spring (key 8) or the spring seat (key 9).
2. Remove the upper diaphragm (key 6), the diaphragm spacer (key 2), the diaphragm assembly (key 5), (which
includes the lower diaphragm), and the O‐rings (key 14).
3. Unscrew the valve assembly (key 7) from the body. The seat ring (key 7A) has a 1‐1/2 inch hex for removal.
4. Apply lubricant (key 21) to the O‐ring (key 7D), lubricant (key 23) to the lower valve and stem (key 7B), and sealant
(key 20) to the thread of the seat ring (key 7A).
5. Install the valve assembly (key 7) into the body (key 1)—making sure the lower valve and stem (key 7B) engages
over the lower spring (key 10)—and into the bottom plug (key 4).
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).
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).
8. Make sure the O‐rings (key 14) are installed in the diaphragm spacer (key 2) and coated with lubricant (key 21).
9. Install the upper diaphragm (key 6).
10. 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.
NOTICE
To avoid damage to the diaphragms, do not overtighten the screws.
11. Replace the six cap screws (key 15) and tighten them in a crisscross manner.
Installation of Diagnostic Connections
See figure 3 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.
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Instruction Manual
D100348X012