OIL SAFETY VALVE (OLV)
Oil Safety Valves (OSVs) are used to prevent tank siphoning, oil leaks in the event of line breaks, and excessive pressure at the burner fuel unit when using a booster pump. Many codes require automatic oil shutoff in case of a line break, while NFPA standards limit burner fuel pump pressure to 3 PSI. Properly installed, Webster OSVs meet both requirements. Check local codes for specific requirements.
Compatibilité
Installation: The OSV can be mounted in any position.
In environments where dirt or moisture is a particular concern, the preferred position is with the cover facing down. This allows any moisture in the diaphragm area to drain through the manual access hole.
For priming, use the OSV priming tool (9994013). Insert the tool into the breathing hole and depress the diaphragm plate.
Technical Characteristics:
Port Size:
OSV 38: 3/8″ NPTF
OSV 50: 1/2″ NPTF
Temperature Range: -40 to 140 °F
Maximum Inlet Pressure: 60 PSI
Recommended maximum flow rates and pressure:
Vacuum (inches Hg) to operate the valve is shown for various flow and pressure conditions.*
| Inlet pressure | ||||||
|---|---|---|---|---|---|---|
| Flow thru valve | 5 PSI | 15 PSI | 30 PSI | 40 PSI | 50 PSI | 60 PSI |
| 1 gph | 2.5 | 2.7 | 3.5 | 4.5 | 5.0 | 5.5 |
| 15 gph | 2.7 | 3.0 | 4.0 | 5.0 | 5.5 | 6.0 |
| 32 gph | 3.7 | 4.0 | 4.7 | 5.2 | 6.0 | 7.0 |
| 45 gph | 4.0 | 4.5 | 5.0 | 6.0 | 7.0 | |
| 55 gph | 4.5 | 5.0 | 5.7 | |||
| 60 gph | 5.0 | 5.2 | 6.0 | DO NOT OPERATE IN THIS REGION | ||
| 70 gph | 5.5 | 6.0 | ||||
*Values given are averages of test results and may vary slightly.
Technical sheet OSV