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Instruction Manual
D100348X012
Mounting
The volume booster is typically nipple‐mounted between the pneumatic supply source and the actuator, and may be
used with piston or diaphragm actuators. Many actuators require larger casing or cylinder connections and
modifications to allow the booster to deliver the higher volume output.
The booster may also be directly mounted to the actuator by using an actuator yoke mounting bracket (see figure 5)
or casing mounting bracket.
Pressure Connections
NOTICE
Do not use sealing tape on pneumatic connections. This instrument contains small passages that may become obstructed
by detached sealing tape. Thread sealant paste should be used to seal and lubricate pneumatic threaded connections.
The input signal connection is 1/4 NPT. The supply and output connections are 3/4 NPT (minimum pipe size
recommended for nipple mounting is 1/2 NPT for 2625 and 3/4 NPT for 2625SST). Connections to the volume booster
should be made as indicated in figure 2. Connections for two typical applications are shown in figure 3. Ensure that the
piping is of proper size to meet the capacity demands of the booster and that you equip the actuator with properly
sized input connections.
Figure 2. Volume Booster Sectional View
EXHAUST PORT
EXHAUST
SUPPLY
W0679‐1
INPUT SIGNAL
DIAPHRAGMS
(KEY 5 AND 6)
2625, 2625SST, and 2625NS Volume Booster
BYPASS RESTRICTION
ADJUSTING SCREW
BYPASS RESTRICTION
(KEY 11)
SUPPLY PORT
OUTPUT TO ACTUATOR
September 2022
5
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