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Volume Boosters / Relays


Bellofram volume boosters or air relays are used for increasing flow capacity and/or remote pressure control applications. These units use a pilot pressure signal, rather than a manual adjustment knob, to control the output pressure.

Type 75 Volume Boosters
Stock # Series Pipe Size (NPT) Adjustment Range (PSI) Max Flow Capacity (SCFM) Max Inlet Pressure (PSI)
961-058-000 T75 1/4 0-150 40 250
961-066-000 T75 3/8 0-150 40 250
961-061-000 T75 1/2 0-150 40 250
961-146-000 T75HR 1/2 0-150 40 250
Type 79 High Flow Volume Boosters
Stock # Series Pipe Size (NPT) Adjustment Range (PSI) Max Flow Capacity (SCFM) Max Inlet Pressure (PSI)
961-157-000 T79 1/2 0-200 125 400
961-158-000 T79 3/4 0-200 125 400
961-159-000 T79 1 0-200 125 400