Betts internal air emergency valve meets HM183 requirements for an internal self-closing stop valve. Body is constructed of aluminum and incorporates a shear section that satisfies 49CFR178.345-8 tested per TTMA RP 84. The 1/8 NPT air inlet is designed to shear and close the valve in the event of an under-ride accident. A fusible plug is installed to dump air pressure if temperatures exceed 212°F.?? Valve uses Teflon® encapsulated seals for compatibility with a wide range of products. Internal air cylinder saves space on exterior of valve providing maximum clearance for piping. Valve is equipped with stainless steel jackscrew that allows for manual operation in the event of an air system failure.
Features
- Size: 4 in. Elbow Grooved
- Maximum Operating Pressure: 18 PSI with 80 PSI line pressure and 25 PSI with 100 PSI line pressure
- Valve MAWP: 35 PSI (2.4 bar)
- Minimum Bursting Pressure: 140 PSI (9.7 bar)
- Contact Seals: Teflon
- Interior Seals: Nitrile
- Air Piston Seal: Polyurethane
- Valve Temperature Range: -40°F to +220°F (-40°C to 104°C)
- Fb-max per TTMA RP86: 24,000 lb. (10,886 kg)
- Fusible plug melts at 212°F (100°C) If valve is subject to higher temperatures, the fusible plug must be relocated to isolate fusible from heat
- * Never bottom load through emergency valve without first opening valve. Failure to do so may result in damage to the tank and/or valve.
Specifications
- Dimensions
- A: 4.38 in. (111.3 mm)
- B: 5 in. (127 mm)
- Inlet Flange (4 in. Sump)
- B.C: 7.25 in. (184 mm)
- 8 Holes: .563 in. (14.3 mm) Diameter
- Outlet (4 in. TTMA)
- 4 in. Grooved - 4.5 in. (114.3 mm)
