Instruction Manual
D100348X012
2625, 2625SST, and 2625NS Volume Booster
May 2017
12
Key Description
6* Upper Diaphragm
For 2625 and 2625SST
Nitrile on nylon
FKM on TPES (high temp)
For 2625NS, EPDM/meta‐aramid
7* Valve Assembly (includes keys 7A, 7B, 7C, 7D, and 7E)
7A* Seat Ring, Brass or S31600
9.5 mm (0.375 inch) supply port
12.7 mm (0.5 inch) supply port
7B* Lower Valve and Stem
For 2625 and 2625SST
Aluminum/nitrile/SST
Aluminum/FKM/SST (high temp)
For 2625NS, Aluminum/EPDM/SST
7C* Upper Valve
For 2625 and 262SST
Aluminum/nitrile
Aluminum/FKM (high temp)
For 2625NS, Aluminum/EPDM
7D* Valve O‐Ring
For 2625 and 2625SST
Nitrile
FKM (high temp)
For 2625NS, EPDM
7E Hex Nut, steel pl
8 Upper Spring, steel pl
9 Spring Seat,
For Aluminum, S31600
For SST, PPS
10 Lower Spring, steel pl
11 Restriction, S31600
12 Hex Nut, steel pl
13* O‐Ring
For 2625 and 2625SST
Nitrile
FKM (high temp)
For 2625NS, EPDM
Key Description
14* O‐Ring (2 req'd)
For 2625 and 2625SST
Nitrile
FKM (high temp)
For 2625NS, EPDM
15 Cap Screw, steel pl (6 req'd)
Standard
With 1/2 NPT vent connection
16 Nameplate
17 Drive Screw, 18-8 SST (2 req'd)
20 Anti‐seize sealant
21 Lubricant, silicone sealant
22 Thread locking adhesive, mild strength
23 PTFE petroleum‐based lubricant (see note immediately below)
Note
PTFE petroleum‐based lubricant is only for use with 2625 and 2625SST.
For 2625NS use a medium grade silicone‐based lubricant.
26 Mounting Bracket
For yoke mounting (see figure 5 and 6)
For casing mounting (see figure 7)
(Use two brackets, stacked, for seismic mounting)
Diagnostic Connections
FlowScannert diagnostic system hook‐up
Includes pipe tee, pipe nipple, pipe
bushings, connector body, and body
protector.
For diaphragm actuator
SST fittings
Brass fittings
For piston actuator
SST fittings
Brass fittings
*Recommended spare parts
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