Model 4300

Description:

The Model 4300 end-of-line spring loaded vacuum vent is intended for use on storage tanks, vapor recovery systems and process systems where higher vacuum relief settings are required.

Available Sizes

• 2" (DN50)
• 3" (DN80)
• 4" (DN100)
• 6" (DN150)

End Connections

Flanged

Features

• Modular Design: The Model 4300 spring loaded end-of-line vacuum vent is part of Valve Concepts, Inc. modular vent product line. The vacuum vent can easily be converted to a pressure/vacuum vent, venting to atmosphere or with a pipeaway, which can either be weight loaded, spring loaded or pilot operated depending on the application requirements.
• Maintains Accurate Settings: The minimum vacuum setting is 1.0 psig and the maximum vacuum setting is 15 psig. As with every vent supplied by Valve Concepts, Inc. a certified test report is provided verifying vent setting and leakage. All spring loaded vacuum vents are suitable for intermittent back pressures of 50 psig. Higher back pressure ratings available on request.
• Condensate Drainage: Self-draining housing body and drip rings keep condensate away from seating surfaces, preventing freezing, binding and clogging.
• Air-Cushioned Seating: Air-cushion seating provides tight sealing to reduce the unnecessary intake of air into the tank and loss of vapors to the atmosphere.

Technique

A spring loaded vacuum pallet assembly in the vent housing remains closed until the set point is reached during normal inbreathing due to product movement out of the tank and/or temperature chances. When the set point of the vent is reached, the spring loaded pallet opens to permit the intake of air to prevent tank damage. Once the vacuum is satisfied the pallet closes providing a tight seal.