YarwaY
SerieS AV-5 Air Vent
InstallatIon, operatIon and maIntenance InstructIons
Before installation these instructions must be fully read and understood
VCIOM-03127-EN 18/09
SpECIfICatIONS
Pressure-temperature rating:
Shell; ASMe Class 600 (Pn 100) B16.34.
Operating Pressure max.; 600 psig (41 bar).
Operating temperature max.; 650F (343C).
test Pressure max.; 800 psig (55 bar)
nominal Venting Capacity:
1.25 Actual cu ft/min. (0.6 Lit/sec) venting to
atmosphere based on a minimum pressure of
15 psig.
Failure Position:
Vent fails open upon bellows failure.
end Connections:
in-line ½”, ¾” nPt (Dn 15, 20) per ASMe
B1.20.1.
installation Position:
Vertical with discharge down.
Special Features:
integral Screen.
NOtE
All pressures are gauge
applICatION
Series AV-5 vent has been designed to remove
air and non-condensables from steam lines.
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OpEratION
the vent operates by means of a thermostatic
bellows which opens and closes an interval
valve in response to temperature changes.
Steam is prevented from discharging through
the vent, and only subcooled non-condensables
are discharged.
MaINtENaNCE
AV-5 vent is permanently assembled; no
maintenance other than flushing or removing
material from the screen is recommended.
trOublEShOOtINg
AV-5 vent is permanently assembled;
no maintenance other than flushing or removing
material from the screen is recommended.
Air vent to pass subcooled gases:
a. Check integral strainer for clogging.
rush or remove material clogging strainer
Air vent blows live steam:
a. Dirt on valve seating area.
b. Worn valve seat. replace the air vent.
c. Failed bellows. replace the air vent.
warNINg
Hot discharge from this product may cause severe
burns. Discharge must be piped away or directed
sothat persons in the vicinity are not endangered.
This product must be isolated, vented and cool to
the touch before repairing or inspecting.
Conduct
discharge to
safe location
Acceptable alternative
vent may cycle on
some condensate
Preferred installation
generally more sensitive
to presence of air
AV-5
