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ValveDepot Product Showroom
Valve & Primer Corporation Catalogue#070254800
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Which Air Valve Should I Use?
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Air Valves are essential components complete pipeline
design. The designed pipeline flow capacity will not be achieved without
essential air valves because of air pocket buildups which can cause flow
capacities to be reduced by 5% to 15% of designed flow.... unfortunately
reduced capacities may go unnoticed because air is an invisible culprit in
pipelines. Air pockets increase energy consumption because pumping
operation will be at higher heads to overcome air constricted flow. Air
valves are not expensive and more than pay their way by greatly improving
pipeline efficiency. Air Valves represent low cost insurance to protect
expensive Pipelines and Pump Stations. It is a well known fact, air pockets
are a major cause of pressure surges and water hammer in pipelines.
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Air
Release Valves
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200A Series

50 Series 55 Series
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Air Release Valves function to release air pockets
that collect at each high point
of a full pressured pipeline. Air Release Valves can open against internal
pressure, because the internal lever mechanism multiplies the float force
to be greater than the internal pressure. This greater force opens the
orifice whenever air pockets collect in the valve. Air Release Valves are
essential for pipeline efficiency and water hammer protection.
Immediate availability.
Sizes 1/2" thru 3". Sizes 4" thru
3".
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Air
and Vacuum Valves
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140 Series 150 Series
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Are float operated,
having a large discharge orifice, equal in size to the valves inlet. Air
and Vacuum valves allow large volumes of air to be exhausted from - or -
admitted into a water pipeline as it is being filled or drained. As the
pipeline fills, water enters the Air Valve, raises the float and
shuts-off. When draining the pipeline, the float drops, allowing air to
enter, preventing vacuum, possible pipeline collapse and damaging water
column separation. Air & Vacuum Valves are an efficient means to fill
and drain pipelines.
Immediate availability.
Sizes 1/2" thru 6".
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Combination
Air Valves
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140C Series

1800 Series
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As the name implies, combines features of Air &
Vacuum Valves and Air Release Valves. These valves are also called Double
Orifice Air Valves. These Valves are installed on all high points of a
system where it has been determined dual function Air & Vacuum and
Air Release Valves are needed to vent and protect a pipeline. Generally,
it is sound engineering practice to use (CAV) instead of simple purpose
Air & Vacuum Valves.
(CAV) are available in two body styles - (1) single body combination (2)
custom built combination (CCAV)
with two bodies.
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The single body (CAV) is used where compactness is preferred
and / or where risk of tampering exists due to accessibility of the
installation.
Immediate availability. Sizes 4" thru 36".
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Slow
Closing Air and Vacuum Valves
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1900 Series
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Are standard Air and Vacuum Valves mounted on a
Surge Check Unit. The Air and Vacuum Valve operates in the normal fashion
allowing air to escape freely at any velocity (maximum discharge velocity
is approximately 300 feet per second at 6.7 PSI; however, good pipe line
design restricts velocity flows of air to 10 feet per second which occurs
at approximately 1 PSI).
The Surge Check Unit operates on the interphases
between the kinetic energy in the relative velocity flows of air and
water. The Surge Check is a normally open valve, spring loaded, so that
air passes through unrestricted, but when water rushes into the Surge
Check Unit, the disc commences to close against the spring and reduces
the rate of flow of water into the air valve by means of throttling holes
in the disc. This ensures normal gentle closing of the Air and Vacuum
Valve, regardless of the initial velocity flow involved and minimizes
surges when the valve closes. As soon as the Air and Vacuum Valve is
closed, the pressure on both sides of the surge Valve disc equalizes and
the disc automatically returns to its open position. This means an Air
and Vacuum Valve does not need an incipient vacuum to open, but can open
at any time the water level drops and line pressure approaches
atmospheric and immediately have full re-entry flow of air into the pipe
line before a vacuum can form. Ratings 125# thru 900# class.
Immediate availability.
Sizes 3" and larger.
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Air
Release Valves & Air And Vacuum Valves for Sewage Lines
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400
Series
401
Series
440 Series
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Operate same as Air Valves for Water, differing
only in appearance with elongated taller bodies. Elongated bodies
minimize clogging by permitting use of a much longer float stem, to prevent
the sewage from fouling up the mechanism. For ease of maintenance, Flushing
Attachments are recommended with the Valves, as shown. When adding Sewage
Air Valves to your pipeline, the same criteria applies, as with the
standard Air Valves. However, the potential for air entrapped with Sewage
pipelines, is even greater than that found in water lines, because Sewage
media generates large quantities of gases. Therefore, it is recommended
each high point be protected
with an automatic Sewage Air Release Valve.
Available Immediately.
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Syphon
Air Valve (Make and Break)
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5000 Series
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SYPHON AIR VALVES are a unique type of Air Vacuum Valve
incorporating a paddle which hangs down the main pipeline flow stream.
The valve will allow a syphon flow to be developed and maintained after
stopping the pump. Subsequently should the syphon flow reverse, the
paddle swings in reverse causing the port to open and break the syphon.
The APCO Syphon Valve requires no electrical connections or regular
maintenance, and is ideally suited for remote out environments.
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In recent years with the emphasis on energy
conservation, consultant engineers for water and water, often consider
pumping by means of a syphon loop. APCO SYPHON AIR VALVES are ideally
suited for application. Solenoid valves for small diameter syphons, or
pneumatically operated butterfly valves, for large diameter syphons, may also
be adapted for this application, but installation and maintenance is
complicated cumbersome. For example, power lines and air lines, must be
installed to operate these valves, an air compressor is also needed. APCO
SYPHON AIR VALVES are mechanically operated, requiring no auxiliary
power. They merely respond to flow, in either direction, to make the
syphon or break it, and the maintenance is virtually nil.
Immediate Availability.
Sizes 3" to 16" for syphons up to 60" diameter.
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Hydraulically
Controlled Air & Vacuum Valves
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7000 Series
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"For positive pipeline protection against
damaging pressure surges." The operating principle of this valve is
the same as the CONVENTIONAL Air and Vacuum Valve, with one exception ...
Hydraulically Controlled Air and Vacuum Valves are normally open (because
the heavy cast float is not buoyant), and slowly close, only after spilling
a regulated volume of water to prevent a pressure surge. This valve
provides excellent pipeline protection against primary and secondary
surge pressures which usually occur when filling or draining a pipeline.
The closing time of this valve is variable and adjustable by means of a
hydraulic control system.
Immediate Availability thru 16 Weeks
Sizes 4" thru 20". Ratings 125# and 250# class.
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Vacuum
Relief/Air Inlet Valves
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1500
Series
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Vacuum
Relief/Air Inlet Valves are a normally closed valve and any time the
System Pressure becomes Negative - IT OPENS IMMEDIATELY - allowing air
into the system to prevent a vacuum forming. When system pressure returns
to positive, the Vacuum Relief/Air Inlet Valve closes air tight. Standard
VP,/AlVs are designed to open with a minimal 1/4 PSI pressure
differential across the orifice. Higher or lower relief settings are
available to suit the application. Rated 250# class available.
Availability immediate thru 16 weeks.
Sizes 3" thru 36".
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Air
Valves For Vertical Turbine Pumps with Water Diffuser
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140DAT Series
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Air Valves For Vertical Turbine Pumps with Water
Diffuser essential to vent air from the pump column at the point of discharge
from the pump and in advance of the pump check valve. Each valve is
equipped with a water diffuser, which performs like the water bubbler on
a water faucet, breaking down the solid destructive column of water into
aerated, non-destructive stream of water.
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Likewise, the surging water entering the deep well
air valve is and broken down into a smooth flowing stream of water. In
this manner, positive closure of the vertical turbine air valve without
water hammer or damage to the valve pump, is accomplished additionally.
The Double Acting Throttle Device permits regulation of the flow of air
escaping from the valve to establish a back pressure, slowing the rising
column of water and the surge in line during start up is greatly reduced.
The Double Acting Throttling Device spring loaded mechanism allows full
flow air in draining of system. This action results in a smoother trouble
free operation of the pumping system.
Immediate Availability thru 16 Weeks.
Sizes 1/2" - 3".
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