(773) 685-7300 Fax: (773) 685
3217 North Pulaski Road Chicago, Illinois 60641
Phone: (773) 685-7300 Fax: (773) 685-7332
NO. 7 SERIES AUTO-VENTS"
Air Eliminators For Hot Water Heating
and Chilled Water Cooling Systems.
For continuous venting of hot water
heating systems and chilled water cooling
systems. Install on mains, pipe lines,
unit heaters, chillers, convectors, radiant
panels and coils.
The No. 7 Series Auto-Vents" are
reliable, automatic air eliminating valves
for concealed radiators, pipe lines, tanks
and other devices where water or liquids
are used for heating or cooling. They
have proven to be the solution to problems
that have confronted engineers and contractors in which air pockets or traps
retard the free circulation of the liquids
and reduce the efficiency of the system
or appliance. The No. 7 Series of
Auto-VenP air eliminators are made of
brass and equipped with a self-closing,
float-operated valve. The valve is
equipped with a Monel" metal spring
and a Neopreneevalve seat which is
unaffected by high temperatures, oil and
anti-freeze. No air chamber is required.
The vent is regularly fitted with a patented
cap that may be used as a check in case
of a leak caused by core sand or scale.
No. 7 h?bw
No. 71 A W W
lld"I.P. kmPk connecZlon
114" I.P. mala cumedkm
Brtgttt h a flntsh
No. 74 A u t o - V M
114" f.P. iemak con*150Ibaprsrurn
*f ombination connection
t/2" female & 314" male
*Up to 150 hpmewm
* Bright braas fhrlh
Nan• Vwtlcal mounting
118" I.P. female oonnactlon
118" femak dds opening
75 1b.. pmasum
BdgM brrrw finm.
or 5116" O.D. Tubing
Hot or Chilled Water
NO. 66,67,68 AUTO-VENTS" AND
For use on convector radiators,
baseboard radiation and radiant panels.
Designed for use where space is limited
May be installed in trouble spots
previously neglected or improperly
For use on systems with pressures up to
No air chamber required.
The valve is always in a closed position
until the air collects in the valve shell.
NO. 67 Auto-VW
No. 66 A - W
No. 68 Aut*VtmP
When sufficient air accumulates to replace * ~ m o u n t f n g
1 W I.P. mlo connecUon
1/8" I.P. mda comedbn
114" I.P. male connection
the water, the float drops and the float
U p t o 5 0 I b r . ~
* U p t o 5 0 I b n ~
* u p t o s o I b r . ~
lever pulls downward on the self-closing
~ 2 5 ~ inw
~ x 1
3 3 U " x W6"
Bright bram tfnkh
valve, unseating it. As the air passes out
Brlghl brwr fIn1.h
BdgM brwr flnhh
of the vent, liquid again fills the valve
shell which raises the float, causing the
valve to seat once again. As fast as air
accumulates, this action is repeated.
In situations where Safe Waste is required
by law or areas particularly susceptible to
water damage, the No. 7A Connector is
used to connect 114 copper or plastic
tubing to the venting port of Maid-0'[email protected]
vents. In this manner, any spray caused
at system start-up or leakjng caused by
scale in a system can be safely directed to
The No. 9AS Shortstop is an Automatic -v-.
Shut-Off that saves hours when changing
out Maid-0'-MisP vents with 118" male
connections. This accessory is a
spring-loaded shut-off that stops the flow
of water automatically
when the vent is removed, APPLICA~NS
and re-opens when a new
Cross sectional diagram of No. 67 and No. 68 Auto-VenP
Maid-0'[email protected] is
installed. With a Shortstop
in place, it is no longer
necessary to drain the
system to switch out vents.
No. 27 AND 37 AUTO VENTS"
For automatically venting radiators,
convectors, fan coil units or baseboard
radiation, as well as high points of
overhead mains, radiant panels and
small unit heaters where water is used for
heating or cooling. NO AIR CHAMBER IS
The No. 27 and 37 Auto-Vents" are
dependable float-operated valves.
Their construction and internal working
parts are the same as the No. 7 Series
Auto-Vents" except smaller in size. Made
of non-ferrous metals.
No. 27 A
No. 37 Auto-VmnP
118" I.P. vertical nuke battom conngction
118" I.P. female side connectic
No. 97 Auto-Vent
114" x 118" Red. El
No. 37 Auto-VenP
No. 27 Auto-VenP
installed on convector radiator
No. 37 Auto-VenP
installed on baseboard
No. 27 Auto-VenP 81
venting overhead hot water heating
or cooling mains
No. 72 AUTO VENT
For vertical or horizontal mounting on convectors, baseboard
and free-standing radiators. The No. 72 Auto-Venf is a fast
venting valve of the expansion type. All expansion and
contraction of the single non-porous, composition disk is
confined to four vent ports. Manual venting and tight shut-off
are controlled by a valve cap with screwdriver slot adjustment.
No. 95 PUSHBUTTON MANUAL VENT
The No. 95 Pushbutton Manual Venf provides the easiest way
ever to manually vent a radiator! You don't need a key, coin or
screwdriver. All you have to do is push on the insulated cap
of the No. 95 Pushbutton Manual [email protected] release trapped air.
Let go and the vent closes automatically. Great for tight
spaces where vents requiring a key or coin are not practical.
- 1 3!4mxqgp
No. 79 or No. 95
For Convector Radiators
For Baseboard Radiation
MAID 0' MISTa/ [email protected]
A vent port size for every room, from the largest
size for the coldest rooms to the smallest size
for the "too hot" rooms. Easy to install on any
ONLY these Maid-0'[email protected]
valves give you ALL these benefits!
16 Different Models
Self-Adjusting Thermostatic Control
Float to Prevent Water Escape
Reduces Radiator Noise
Cuts Fuel Consumption
Assures Even Heat Distribution
Lowers Operating Costs
112'' x 314"
__ .'.. ..
For radiators in room in which the thermostat is located;
or where radiators affect operation of thermostat.
No. 5 Venting capacity equal to 4 ordinary air valves. Use on
radiators near boiler and in warm rooms (second-floor
radiators, for example).
No. 6 Venting capacity equal to 8 ordinary air valves. Use on
radiators farther from boiler and in cold rooms.
Venting capacity equal to 15 ordinary air valves. Use on
radiators farthest from boiler and in coldest rooms (for
example, on third floor radiators and above).
Venting Capacity equal to 27 ordinary air valves. Use
when large amount of air must be vented such as on
radiators with particularly long branches and on very large
No. 1 Designed to vent the air from the main lines, as well as on
longer runs (depending on the size of the building). Has
112 x 314" combination vertical connection. Use one or
more at the end of the short main, or the main running to
the warm side of the building. Also use two or three at
the end of the long main, or the main running to the cold
side of the building.