Model 3300

The Model 3300 vacuum relief vent is intended for use on storage tanks, vapor recovery systems and process systems where vacuum relief is required. 

Available Sizes

• 2" (DN50)
• 3" (DN80)
• 4" (DN100)
• 6" (DN150)
• 8" (DN200)
• 10" (DN250)
• 12" (DN300)

End Connections

Flanged

Features

• Modular Design: The Model 3300 end-of-line conservation breather vent is part of Valve Concepts modular vent product line. The Model 3300 can easily be field converted to an end-of-line pressure/vacuum relief vent with the addition of weather hood components or an in-line pressure/vacuum relief with the addition of pipe away body components. 
• Maintains Accurate Settings: Minimum setting available is approximately 0.25 oz/in² and maximum setting upwards to 2.5 psig. See Set Point Limits Tables 4(a) and 4(b). If higher settings are required, see Valve Concepts Series 4000 Spring Loaded Vents. All vents are tested to Valve Concepts high standards for both seat leakage and set point prior to shipment. A certified test certificate is included with each vent verifying the accuracy of vacuum setting and seat leakage. Seat leakage rates meet or exceed current editions of API Standard 2000.
• Condensate Drainage: Self-draining body and specially designed seat ring keeps condensate away from seating surfaces, preventing freezing, binding and clogging.
• Air-Cushioned Seating: Air-cushion seating provides tight sealing to reduce evaporation losses and the release of toxic vapors. The pallets have outer guiding and center stabilizing stem to provide self alignment and tight seating.

Technique

Weight loaded pallets in the vent housing allow the intake of air and the escape of vapors as the tank breathes due to thermal changes and product movement in and out of the tank. The pallets open and close to permit in breathing and out breathing necessary to maintain the tank pressure within permissible limits to avoid damage to the tank.