DESCRIPTION
The Bell & Gossett Pressure Reducing Valve is designed for
filling hot water boilers and associated piping systems to a
properly controlled pressure after boiler installation or sys-
tem servicing. It is not a safety device and is not intended
to be used as a water feed valve to control boiler water
at a safe operating level. They are factory set at specified
limits although adjustment is easily made. They are equipped
with a built-in strainer and low inlet pressure check valve.
SIZES & PERFORMANCE
Maximum Flow 5
1
/2-6 GPM at 125 PSIG inlet Pressure.
TEMPERATURE AND PRESSURE LIMITS
Maximum Operating Temperature: 225°F.
Maximum Working Pressure: 125 PSIG
INSTALLATION INSTRUCTIONS
The Pressure Reducing Valve must be installed with the flow
arrow on the body pointing in the direction of flow. A shut-off
valve must be installed on the city water side of the Pressure
Reducing Valve. If the Pressure Reducing Valve is not
equipped with a fast fill feature, a by-pass may be used for
rapid filling, but it must remain closed during normal system
operation.
For safe boiler operation, installation of a low water cut off,
adequate burner safety control and a properly installed float
operated water feed control is recommended. Examples of
these types of control devices include the McDonnell & Miller
No. RB-24 and RB-120 low water cut offs and the No. 47-2
combination feeder and low water cut off.
Uncontrolled firing and overheating of boiler and boiler com-
ponents may occur in a hot water heating system that is
installed without adequate safety controls. The installation of
a functioning air control system and thermal expansion com-
pensation system is required for the proper operation of a
hot water heating system.
V55999
REVISION L
INSTRUCTION MANUAL
Reducing Valves
Installation, Operation &
Service Instructions
INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.
Bell & Gossett
SAFETY
INSTRUCTIONS
This safety alert symbol will be used in this manual to
draw attention to safety related instructions. When used,
the safety alert symbol means ATTENTION! BECOME
ALERT! YOUR SAFETY IS INVOLVED! FAILURE TO FOL-
LOW THESE INSTRUCTIONS MAY RESULT IN A SAFETY
HAZARD.
WARNING LABEL
PART NO. V56871
INSTALLED IN THIS
LOCATION. IF MISSING
IT MUST BE REPLACED.
FACTORY ADJUSTABLE
MODEL SIZE SETTING RANGE
NUMBER INCHES PSIG PSIG
B-38
1
/
2
NPT
B 7-12
3
/
4
B-38TU
1
/
2
UNION
12 10-25
NPT/SWEAT
FB-38
1
/
2
NPT
FB-38TU
1
/
2
UNION
NPT/SWEAT
6
1
/
2
NPT 45 25-60
7
3
/
4
RETURN
BOILER
VALVE
FLOW
C.W. FILL
B&G MODEL “B”
OR “DV” ASME TANK
VALVE
SHUT-OFF
B&G AUTOMATIC
B&G RELIEF
AIR VENT
OPTIONAL
SIDE OUTLET
BOILER
CONNECTION
TYPICAL INSTALLATION
B&G PRESSURE
REDUCING VALVE
B&G IN-LINE
B&G
FLO-CONTROL
VALVE
TO
SYSTEM
B&G BOOSTER
AIR SEPARATOR
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