Breather valve
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Breather valve. These valves are designed to protect the reservoirs against excessive positive or negative (vacuum) pressures due to the loading or unloading operations and to the temperature variations. As the reservoir pressure exceeds the valve relief or vacuum setting, the pallets arise allowing the venting or the vacuum relieving of the reservoir. Main Features : -Replaceable seats. -Antifreezing pallets; the drip around the pallet avoids condensate collecting around the seat. -Pallet guides located above the seat; this arrangement assures a no-jamming guide of the pallet not affected by contaminant fluids as a close coupling between pallet and guides is not necessary. -Bird screen avoids the entering of foreign elements. -Setting: any setting available, charging the pallet's dead weight load, between ± 20 mm H20 and ± 400 mmH20. (On request higher sets) Standard Materials : -Body: cast Aluminium, WCB, CF8 (304) CF8M (316). -Seats and pallets: AISI 304, AISI 316. -Bird screen and guides: 18/8 Stainless Steel. -Diaphragms: FEP, PT.FE., BUNA-N, VITON etc. Flanges : ANSI 150, drilled to UNI PN 10 on request. Dwg. 101/AA Valves : These valves are used when the setting values exceed 800 mm H20. Dwg. 101/AC Valves : These valves are used on blanketed tanks. Through the valve an inert gas can be fed into the reservoir when its pressure value is below the blanketing pressure. Dwg. 101/TV Valves : Tightness by elastomeric 0-rings (Buna-N, Viton, Chemraz) to minimize the leakages.