Specifications
Stock Number:
Service Pressure:
System Connection:
Temperature Range:
Dimensions:
Weight:
Clear Height:
PAV-W
PAV-WS (Supervised)
Up to 175 PSIG (12 Bar)
½” NPT Male
40°F - 270°F (4.5°C - 132°C)
14” (W) x 7” (H) x 7” (D)
356mm (W) x 177mm (H) x 177mm (D)
8 Lbs (3.6 Kg)
5” (127mm)
General Description
The ECS Ejector Automatic Air Vent (PAV-W/WS) is a device that provides automatic venting of trapped air in wet
pipe fire sprinkler systems. As a fire sprinkler system is filled with water, trapped air migrates to the high point of the
system near the vent installation location which allows for trapped air to be vented. Trapped air contains oxygen
which is the primary cause of corrosion in fire sprinkler systems. Corrosion in wet pipe fire sprinkler systems is
directly proportional to the amount of oxygen trapped within the system piping, so a reduction in trapped air will in
turn reduce the internal corrosion activity of the fire sprinkler system. Venting the trapped air in a wet pipe sprinkler
system can improve water delivery time and reduce false water flow alarms.
The ECS Ejector Automatic Air Vent must be installed as shown on the engineering design documents. If a location
is not provided, install the vent at an accessible high point on the fire sprinkler system remote from the system riser
where gas can be vented and at a location that the pressure gauge provided for visual monitoring can be viewed
from directly below. The PAV-W/WS is also equipped with brass components that allows the device to be installed
in areas subject to external corrosion. The float mechanism on the ECS Ejector Automatic Air Vent will automatically
close when water reaches the vent and the redundant design eliminates the need to plumb the PAV-W/WS to drain.
If the primary float valve allows any significant amount of water to leak past it, the second float valve will close
preventing water from discharging and provide a system pressure reading on the pressure gauge. This condition will
be an indication that the primary automatic gas vent valve has failed and requires service or replacement. The
pressure gauge is designed to be visible from the floor below the ECS Ejector Automatic Air Vent from a distance of
approximately 30 feet.
There are two available models of the ECS Ejector Automatic Air Vent: PAV-W and PAV-WS. The units both operate
as described previously; however, the PAV-WS includes a single contact rated 24VAC/DC @ 2A for electronic
monitoring. When connected to a building alarm system, connect the contact of the PAV-WS using an end-of-line
resistor (EOLR) in accordance with the wiring diagram in Figure 1.
• Patented redundant float design eliminates piping to a drain
• Support Hanger Not Required
U.S. Patents No. 8,636,023
April 2020 - Rev 4
1
ECS EJECTOR
AUTOMATIC AIR VENT
PAV-W
Engineered Corrosion Solutions • 11336 Lackland Road St. Louis, MO 63146 • Phone: 314.432.1377 • www.ecscorrosion.com
