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IN-LINE PRESSURE / VACUUM
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| SERIES | HOUSING | PALLETS | PALLET DIAPHRAGM |
| 8740 | Aluminum 356 | Aluminum | FEP Film |
| C8740 | Ductile Iron A536 | 316 S.S. | FEP Film |
| F8740 | 316 S.S. | 316 S.S. | FEP Film |
| RE8740 | Aluminum 356 | 316 S.S. | FEP Film |
| Flange mating: | Aluminum: | Mates with 125# FF ANSI. | |
| Other metals: | Mates with 150# RF ANSI. |
The design
of the Protectoseal In-Line Pressure / Vacuum Conservation Vent, Series
No. 8740, makes these vents particularly suited for mounting inside tank
house installations. Outlet pipes can direct vapors to some appropriate
area for discharge. Locating the vent inside the building facilitates
maintenance and eliminates hazardous roof top inspections. Pallets in
the vent housing allow intake of air and escape of vapors as the tank
normally breathes in and out. Pallets open and close to permit only that
intake or outlet relief necessary to remain within permissible working
pressures and avoid tank damage.