Spring Loaded Pressure / Vacuum Vent
The Model 4200 Spring Loaded Vent provides pressure
and vacuum relief in applications where higher pressure
settings are required and that require vapors to be piped
A spring loaded pallet on the pressure side of the vent allows the discharge of vapors to the outlet piping when the
tank pressure exceeds the set point and a weight loaded
/spring pallet on the vacuum side of the vent allows the
intake of air when the tank vacuum exceeds the set point.
The pallets open and close to regulate the tank pressure
within permissible limits to avoid damage to the tank as
the tank normally breathes due to the thermal changes
or product movement. Virtually eliminates the intake of
air and the escape of vapors, except during normal tank
breathing, thus reducing product loss.
Housing Material: The Model 4200 is a rugged design
made to last. Available in Aluminum, Carbon Steel, or
Sizes Connections. Available in Sizes 2" thru 6". CS
and SST vents have Raised Face Flange, Aluminum vents
have Flat Face Flange to mate with standard ASME 150#
fl ange connections. On sizes 2" thru 6" the Model 4200
is available with the same size inlet and outlet to reduce
outlet piping cost.
Pallet Diaphragm Material: FEP TFE is Standard.
Also available Buna-N, EPDM or Fluorocarbon Elastomer
Modular: The Model 4200 pipe-away conservation vent is
part of the Valve Concepts, Inc. modular vent product line.
The Model 4200 can easily be converted to a vacuum only
vent or end-of-line pressure / vacuum vent and can either
be direct acting or pilot operated. Only Valve Concepts,
Inc. offers complete modularity throughout its complete
vent product line.
Maintains Accurate Settings. The minimum pressure
setting is .5 oz./ in2 and the minimum vacuum setting is .5
oz/in2. Maximum pressure setting is 15 psig and maximum
vacuum setting is 15 psig. Lower settings may require
weight loading instead of springs on vacuum side. All ventsare tested to Valve Concepts, Inc. high standards for both
leakage and set point prior to shipment. A certifi ed test
certifi cate is included with each vent verifying the accuracy of both the pressure and vacuum setting and leakage. A
leakage rate of less than 1 SCFH at 90% of set point is
verifi ed for both pressure and vacuum.
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 evaporation losses and the release
of toxic vapors into the outlet piping, except under normal
breathing conditions. The pallets have outer guiding and
center stabilizing stem to provide self alignment and tight