Bell & Gossett V57895B Venturi/Ball Valve Combination MV - Manual (Page 2)

2. For installing NPT connections:
Apply pipe compound conservatively to male connecting
fittings only.
After installation check all joints for leakage and retighten
where necessary.
OPERATION INSTRUCTIONS
1. Energize the zone, circuit and/or system pump(s) as
applicable.
2. Using Bell & Gossett Model RP-250B Readout Probes,
sequentially attach a Bell & Gossett differential pressure
readout kit to the readout valves on each Venturi/Ball
valve.
3. Read the differential pressure across the orifice of the
Venturi/Ball valve.
4. Using the differential pressure data sheet #EP-600 of the
Venturi/Ball valve to read actual GPM.
Example: The Venturi/Ball valve model 3/4" L. If the dif-
ferential pressure across the orifice read at 46" W.C. the
flow rate is 4 GPM.
HOW TO USE THE MEMORY STOP FEATURE
1. Make the final degree of closure setting.
2. Loosen the handle nut and rotate memory stop until
against the body locking.
3. Tighten the handle nut.
SERVICE INSTRUCTIONS
Periodically inspect the Venturi/Ball for signs of leakage or
corrosion.
WARNING: Use of improper procedures to sweat
valve model with union connection into system can
damage valve. Before installing sweat union connection to
valve, remove the union nut and O-ring from the valve
body, then union tailpiece with union nut must be sweated
(soldered) into place. Failure to follow this instruction could
result in property damage and/or moderate personal injury.
CAUTION: Heat Associated with the use of silver
solder may damage a Venturi/Ball valve and void the
product warranty. Do not use silver solder. Failure to follow
these instructions could result in property damage and/or
moderate personal injury
CAUTION: The use of PTFE impregnated pipe
compound and PTFE tape on pipe threads provides
lubricity. Care should be taken to prevent overtightening
which may damage the valve body. Failure to follow these
instructions can result in moderate personal injury and/or
property damage.
WARNING: Hot water leakage can occur from read-
out valves during probe insertion and during hookup
of readout kit. Follow the instruction manuals supplied with
readout probes and readout kits for safe use. Failure to
follow these instructions could result in serious personal
injury or death and property damage.
WARNING: Corrosion or leakage is indication, that
the Venturi/Ball must be replaced. Failure to follow
these instructions could result in serious personal injury or
death and property damage.
Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.xyleminc.com/brands/bellgossett
Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries.
© 2012 Xylem Inc. V57895B September 2012