Model 4400
Spring Loaded Pressure Vent To Atmosphere
OBJECTIVE
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. If
vacuum relief is needed, see Valve Concepts.
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 (fi re 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.
BODY SIZE: 2", 3", 4", 6"
4400 TANK VENT - SPRING LOADED