Valvula De Aire Modelo 400

2008

Sewage Combination Air Valve
SERIES 440 SCAV

Sewage Air Release Valve
SERIES 400 SARV

Sewage Air Vacuum Valve
SERIES 401 SAVV
CONCAVE FLOAT* (Patented)

Generation II

AIR VALVES

SEWAGE AIR VALVES

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Edition

VALVE & PRIMER CORPORATION
1420 WRIGHT BLVD.
•
SCHAUMBURG, IL 60193-4599
847.524.9000
•
FAX:847.524.9007•
800.323.6969
website: www.apcovalves.com • e-mail: factory@apcovalves.com

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GENERATION II
APCO AIR VALVES FOR
SEWAGE PIPELINE SYSTEMS
EFFECTS OF AIR in a pressurized closed-pipeline system must be recognized. An air pocket will decrease the
cross sectional area and increase frictional pressure loss. The combined loss for two-phase flow (air & water)
is always greater than thepressure loss for each phase flowing alone. Thus, air in a pipeline increases system
flow resistance and increases system head against which pumps must operate.
AIR MAY ENTER A PIPING SYSTEM IN MANY WAYS:

(1) Air in the pipeline when initially filled may not be completely purged.
(2) Air may be drawn in at a pump inlet by entrainment if the liquid level falls below the inlet elevation.
(3)Air in solution (about 2% by volume) will be released at points in the pipeline where the pressure
is reduced, especially where the line elevation is close to the hydraulic gradient.
(4) Gas created from digested sewage.
(5) Air may be drawn in through packings, seals and flanged joints.
(6) Air may enter by vortexing at the pump.
AIR IN PIPING tends to collect at high points in the linewhen flow velocities are low. If the air pocket
formed is large, part of it will be removed when the velocity increases. This partitioned air may or may not go
through the system. It all depends on velocity, pipe size, and pipe down-slope. It may only move into the
sloping straight section and then return to the summit when the velocity decreases.

While it is impossible to totally preventaccumulation of air (or gases) within the piping system, the volume
can be greatly minimized by installing APCO Sewage Air Release Valves.

When air is present in a hydraulic pipeline, flows are erratic, unpredictable and have high head losses.
Sewage works require Air Release Valves on pipeline high points.
All APCO Sewage Valves are furnished for 150 psi. Higher pressures available. Specify ifoperating
pressure is below 20 psi for a lower durometer seat.

BACKFLUSHING ATTACHMENTS
OPTIONAL FOR ALL SEWAGE VALVES
EXCEPT CUSTOM COMBINATIONS
While sewage media is standing in the valve body, sediment will attempt settling out at the bottom. This sediment may
be flushed out periodically.
After installation, Sewage Valves should be inspected to determine need to backflush approximatelyonce a year.
Inspection takes only a few minutes and is simple:
1. Shut off the inlet valve.
2. Open the blow off valve and observe…if fluid drains out the valve body rapidly, flushing is not required.
Should heavy suspended solids and grease be anticipated, attachments shown are recommended for ease of flushing.

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Series 440 SCAV

400

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SEWAGE COMBINATIONAIR VALVE

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• First in a Single Body
• No Spills
• No Spurts
• Shorter
CONCAVE FLOAT*

SEWAGE AIR VALVES

Now, APCO brings you THE LATEST STATE OF THE ART Sewage
Air Valve design: a Single Body, Double Orifice “Sewage Combination
Air Valve”.
GENERATION II…a new generation of Air Valve Design.
Field tested under actual operating conditions. Incorporating all
featuresthat have made the 400 Sewage Air Release Valves and 401
Sewage Air/Vacuum Valves the world’s finest…Now in a Single
Body-plus a New Concave Float* - to give even greater performance
and reliability.
You no longer need to DIG DEEPER TRENCHES OR BUILD
DEEPER VAULTS BECAUSE THE 440 SERIES IS AT LEAST 30%
SHORTER THAN OTHER MODELS!
Valves that won’t spill or spurt before shutting off. No more...