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PIPE-AWAY PRESSURE / VACUUM
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| SERIES | HOUSING | PALLETS | PALLET DIAPHRAGM |
| 18540 | Aluminum 356 | Aluminum | FEP Film |
| C18540 | Ductile Iron A536 | 316 S.S. | FEP Film |
| F18540 | 316 S.S. | 316 S.S. | FEP Film |
| RE18540 | Aluminum 356 | 316 S.S. | FEP Film |
| M18540 | Hastelloy A494 | Hastelloy C276 | FEP Film |
| Flange mating: | Aluminum: | Mates with 125# FF ANSI | |
| Other metals: | Mates with 150# RF ANSI |
Protectoseal Series No. 18540,
Pipe-Away Pressure / Vacuum Conservation Vent, is designed to provide
pressure and vacuum relief in applications that require hazardous vapors
to be piped away, rather than released into the atmosphere. The 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. Relieving vapors are piped away through
a flanged side connection.