Advertisement
Fig. 7
Fault
Valve is leaking:
• At the bonnet / body joint.
• At the pipe connection.
Valve does not shut off
completely when closed
(hand tight).
MODELS CBV-S5 AND CBV-NPT5
Fig. 8: These curves are for balancing contractors' use when balancing an HVAC system.
For pressure drop vs. flow across the entire valve, please refer to Fig. 9.
–
INSTALLATION TROUBLESHOOTING GUIDE
Possible Cause
Bonnet O-ring has been
damaged.
If solder joint – the joint has
failed, or was not
soldered properly.
If threaded – the connection is
not sufficiently tight, or
the valve was overtightened
during installation and the valve
body has cracked (fractured).
The seat O-ring has been
deformed due to overheating
during soldering.
Venturi C
Performance Curves
v
CBV-S5
CBV-NPT5
Remedy
Remove the handle/stem assembly and replace with the
appropriate replacement part indicated in the table on page 3.
Resolder the connection and recheck for leakage.
Tighten and recheck for leakage.
Remove and reinstall a new valve, being careful not to
overtighten.
Remove the handle/stem assembly and replace with the
appropriate replacement part indicated in the table on page 3.
5
ITEM 1040 SERIES
DATED MARCH 2015
CBV-S5
CBV-NPT5
Fig. 9: These curves show
the pressure drop across the
balancing valves and are
for use in valve sizing. For
"pressure drop/flow" curves –
required for system balancing,
please refer to Fig. 8.
Advertisement
