The Protectoseal 8540H, End-of-Line Pressure/Vacuum Conservation Vent, is intended for use where both pressure and vacuum relief are required. The pallets in the vent housing allow intake of air and escape of vapors as the tank normally breathes in and out.
TECHNIQUE
Pallets in the vent housing allow intake of air and outflow of vapors as the tank normally breathes in and out. Pallets open and close to permit only the intake or outlet relief necessary to remain within permissible working pressures and avoid damage to tank Peripheral pallet assembly guides and center pallet stem guides insure proper alignment of pallet assembly on the seat and smooth lifting and reseating action.
SPECIAL FEATURES
Fast Inspection, Easy Maintenance. Design and light weight of entire unit permits easy, convenient handling for inspection and maintenance.
Maintains Accurate Pressure Settings. Set points are accurate to within +/- 3% across the entire range of available settings.
Air-Cushioned Seating. A flat, smooth diaphragm of FEP film is supported on both sides of an annular channel to form a floating air seal with the seat. An outer support rim assures proper seating.
Automatic Condensate Drainage. Self-draining housing body and drip rings keep condensate away from seating surfaces. Vent is protected from freezing, binding and clogging.
Low-Leakage. Vent leakage is no more than 1 SCFH at 90% of the set pressure. Pressure tested against leakage through castings and gasketed joints.
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