Model 4400

Description:

The Model 4400 spring loaded pressure relief vents are designed for higher pressure settings and are used in applications for normal or emergency venting pressure relief. The series 4400 vents are pressure only devices and as such do not provide vacuum relief. Vacuum relief must be supplied by the operating vent with which the tank is equipped.

Available Sizes

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

End Connections

Flanged

Features

• Easy Inspection: The 4400 series vent is light weight and designed for trouble free entry for inspection and maintenance. A course, mesh screen prevents entry of foreign matter into seating area.
• Maintains Accurate Settings: The minimum pressure setting is 1.25 psig and the maximum setting is 15 psig. As with every vent supplied by Valve Concepts, Inc. a certified test report is provided verifying vent setting and a leakage rate of no more than 1 SCFH at 90% of the customer specified set point.
• Air-Cushioned Seating: Air-cushion seating provides tight sealing to reduce the unnecessary release of vapors and loss of product to the atmosphere.

Technique

Under normal operating conditions, the spring-loaded pallet assembly is closed providing a vapor-tight seal. In the event the tank pressure reaches the set point of the vent, due to product movement into the tank, thermal expansion of the product and vapors or due to an emergency (fire involvement of the tank), the spring-loaded pallet lifts to vent excess vapors thereby protecting the tank from dangerous over pressurization. Once the over pressure condition is relieved the spring-loaded pallet closes to provide a vapor tight seal.