AGF PURGEnVENT 7900AAV User manual

Model 7900AAV & 7950ILV
Owner’s Manual
INST-PURGEnVENT
AGF Manufacturing Inc.
Air Venting Valves
Air Venting Valves
Model 7900AAV
Model 7950ILV

NFPA 13 code requires venting the excess air from wet fire sprinkler systems to
help prevent corrosion.
Table of Contents
Recommended Installation Locations...........................................................3
Installation Instructions
Model 7900AAV....................................................................................................4
Model 7950ILV.................................................................................................. 4-5
Filling the System .............................................................................................5
Cleaning the Vent Screen
Quick Clean..........................................................................................................5
Full Clean..............................................................................................................6
Air Venting Valves
for Wet Pipe Fire Sprinkler Systems
AGF Manufacturing Inc.
100 Quaker Lane • Malvern, PA 19355
Phone: [phone]
Fax: [phone]
www.agfmanufacturing.com

AGF Manufacturing Inc. • Phone: [phone] • Fax: [phone] • www.agfmanufacturing.com 3
Recommended Installation Locations
M7900AAV Valve
Near high points in system per NFPA 13 (2016). Examples are the top of a•
vertical riser, elevated branch lines, and under roof peaks.
At the end of branch lines.•
Locations which have previously experienced internal pipe corrosion due to•
pockets of trapped air.
M7950ILV Valve
Near the floor control assembly•
,1/(7137
9(17
385*(9$/9(
&211(&7,1*187
6+2:123(1
*$5'(1+26(7+5($'
&$3
287/(7137
Model 7900AAV
MinimumPSIG:2.9•MaximumPSIG:175

PURGEnVENT Owner’s Manual
4
Installation Instructions
M7900AAV Installation
Ensure vent will be vertical (plumb) when finished.1.
Remove plastic shipping plug from the ½” port of valve and discard.2.
Apply PTFE tape to the 1” pipe thread where the M7900AAV will be mounted.3.
Install valve using a wrench on the inlet flats. Ensure the valve’s ½” outlet port4.
is oriented in the up position.
Apply PTFE tape to both halves of the provided nipple.5.
Install nipple into the valve’s outlet port.6.
Thread inlet of air vent onto nipple. Tighten using 17. 1⁄16” wrench on flats; position
as desired.
OPTIONAL:
The purge valve may be reoriented as needed by loosening (not removing) the•
nut which connects it to the main M7900AAV valve. After the purge valve is
rotated to the desired position, ensure the connecting nut is tight.
The Mist Collection Assembly may be connected to the ¾” outlet of the vent.•
A standard drain line may be connected to the ¾” outlet of the vent.•
M7950ILV Installation
Ensure vent will be vertical (plumb) when finished.1.
Create required cutout length for the pipe section.2.
Verify flow arrow direction of preassembled PURGE3. nVENT pipe.
Install into sprinkler pipe as directed by code and AHJ.4.
Apply PTFE tape to both halves of the provided nipple.5.
Install nipple into the M7900AAV valve’s outlet port.6.
Thread inlet of air vent onto nipple. Tighten using 17. 1⁄16” wrench on flats; position
as desired.
M7950ILV Alternate Installation
Turn main pipe section 45˚.1.
Install M7900AAV ensuring vent is positioned vertically.2.

AGF Manufacturing Inc. • Phone: [phone] • Fax: [phone] • www.agfmanufacturing.com 5
OPTIONAL:
The purge valve may be reoriented as needed by loosening (not removing) the•
nut which connects it to the main M7900AAV valve. After the purge valve is
rotated to the desired position, ensure the connecting nut is tight.
The Mist Collection Assembly may be connected to the ¾” outlet of the vent.•
A standard drain line may be connected to the ¾” outlet of the vent.•
Filling the System
Open the M7900AAV valve handle to the “Vent” position.1.
Open the purge valve (small handle).2.
Remove the cap from the purge valve and connect a drain line (garden hose)3.
to it’s port.
Fill the system with water.4.
Monitor the discharge from the drain line and close the purge valve when a5.
steady stream of water is achieved.
Disconnect the drain line and reinstall the cap onto the purge port.6.
Keep the M7900AAV valve handle in the “Vent” position to allow any residual7.
air to escape the system through the automatic air vent.
Cleaning the Vent Screen
If the internal vent screen becomes clogged with debris it can be cleaned using
one of the following methods:
Quick Clean
Close the M7900AAV valve.1.
Remove the cap from the purge valve and connect a drain (garden hose) to2.
it’s port.
Open the purge valve.3.
Flush the screen by quickly and repeatedly opening and closing the M7900AAV4.
valve.
Close the M7900AAV valve and allow the residual water to drain out.5.
Close the purge valve.6.
Disconnect the drain hose and reinstall the cap.7.
Slowly open the M7900AAV valve to vent.8.

PURGEnVENT Owner’s Manual
6
Full Cleaning
Close the M7900AAV valve.1.
If needed, place a bucket under the PURGE2. nVENT to capture the small
amount of residual water which will come out during the next steps.
Using a wrench, loosen the nut which connects the purge valve to the3.
M7900AAV valve.
Remove the purge valve from the M7900AAV valve. Set the purge valve and4.
it’s flat gasket aside.
Remove the vent screen from the M7900AAV valve and clean as needed.5.
Place the vent screen back into the M7900AAV valve.6.
Reinstall the purge valve making sure the screen is centered and the flat7.
gasket is properly captured between the two halves of the assembly. DO NOT
apply grease to the at gasket.
Position the purge valve handle as desired and tighten.8.
Make sure that the purge valve is closed.9.
Slowly open the M7900AAV valve to vent.10.
Check for leaks and tighten the connecting nut if needed.11.
Thank You For Using Our Products!
For our complete family of products, visit
us online at www.agfmanufacturing.com

M7700
M7800
Corrosion Monitors
for Wet or Dry Pipe Fire Sprinkler Systems
www.corrinsite.com

AGF Manufacturing Inc.
100 Quaker Lane • Malvern, PA 19355
Phone: [phone]
Fax: [phone]
www.agfmanufacturing.com