FIG FMMASO
Overfill Prevention Valve for Used Oil Systems
The ASO series of valves is used to shut-off the air supply to an AOD (Air-Operated Diaphragm) pump when the liquid level approaches full capacity.
The ATO valve is used to turn on the air supply to an AOD pump when the liquid level approaches the full capacity.
Product Features
Standard Features
- Installs directly into a 2″ female threaded tank top opening
- Accepts ¼″ air lines
- When the ASO valve closes, the air supply is diverted to an audible whistle on the 91S and 91EXS models
- Operating temperature range is -10°F to 185°F
- Air flow capacity is 20 CFM @ 100 PSI. Maximum air pressure is 100 PSI
- Valve automatically resets as liquid is removed and the air pressure to the valve is turned off
- FMMASO-91 and 91S shut-off height is 6½″ from the tank top
- FMMASO-91EX and 91EXS shut-off height is 17⅜″ from the tank top
Construction Details
- Valve body and collar: Anodized aluminum
- Float: Polypropylene
- Float rod and valve spool: Brass
- O-ring seals: FKM
- Hardware: Stainless and plated steel
Code Compliance
UL 2583 Listed
Florida DEP EQ 576
Patent 5007450
Valve with optional alarm for use on used oil evacuation systems which use an air operated pump
Product Ordering Instructions
| Figure | Suffix | Size | Description | Weight (lbs) |
| FMMASO | 91EX AV | 2” | Air Shut-Off Valve, w/o audible signal, extended shut-off height body | 5 |
| FMMASO | 91EXS AV | 2” | Air Shut-Off Valve, w/ audible signal, extended shut-off height body | 5 |
| FMMASO | 91 AV | 2” | Air Shut-Off Valve, w/o audible signal | 2.5 |
| FMMASO | 91S AV | 2” | Air Shut-Off Valve, w/ audible signal | 2.6 |
| FMMATO | 91 AV | 2” | Air Actuation Valve, w/ High Level, w/o audible signal | 2.5 |