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Cashco — Model 4200 Spring Loaded Pressure / Vacuum Vent with Pipe-Away


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                       Model 4200
           Spring Loaded Pressure / Vacuum Vent
                            with Pipe-Away

OBJECTIVE
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
away.


TECHNIQUE
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.

CONSTRUCTION
Housing Material: The Model 4200 is a rugged design
made to last. Available in Aluminum, Carbon Steel, or
316 SST.
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
(FKM).
SPECIAL FEATURES
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
seating.

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STANDARD/GENERAL SPECIFICATIONS

Gaskets:

Standard: TFE/TFE Rope


Diaphragm :FEP-TFE.


Temperature Limits:
-400° to 400° F (-240° to 204°C)
Fluorocarbon Elastomer – (FKM):
0° to 400° F (0° to 204°C)
Buna-N (Nitrile-NBR):
-30° to 200° F (-34° to 93°C)
EPDM (Ethylenepropylene):
-40° to 225° F (-40° to 107°C)

Painting:

Standard: Exterior coating will be a
combination of Cashco Paint Specs #S-
1777 epoxy and #S-1743 powder coated.
fasteners, seat surfaces and corrosion
resistant parts excluded.
Alternate Paint: See Opt-95OS.


Pressure& Vacuum Ranges:

See Table 5 and Table 7 on the coder.
Differential Pressures greater than 2
psid will limit the minimum vacuum set
point to 2 oz/in2.

OPTION SPECIFICATIONS

BUG SCREEN - 304 stainless steel, 4x4 welded mesh.


FLAME SCREEN

- 304 stainless steel, 30x30 woven mesh


ELECTRIC TRACE - Electric heat tape is wrapped around
external surface of the vent body. A thermal insulation
jacket is secured over the tape and vent body to minimize
heat loss. Commonly used to prevent the formation of
ice during freezing conditions. See STEAM JACKETING
if elevated process temperatures are desired.


STEAM TRACE - Copper tubing is wrapped around the
external surface of the vent body. A thermal insulation
jacket is secured over the tubing and vent body to minimize
heat loss. Commonly used to prevent the formation of
ice during freezing conditions. See STEAM JACKETING
if elevated process temperatures are desired.


STEAM JACKETING - Cast aluminum jacket with integratedcarbon steel steam chambers are bolted around
the vent body. Vent valve and jacket are shipped unassembled as vent valve must fi rst be installed. Commonly
used to prevent stored media vapors from crystallizing
at ambient temperatures.

Option -40:

NACE CONSTRUCTION. In ter nal
wetted por tions meet NACE stan dard
MR0175, when ex te rior of the vent is
not directly ex posed to a sour gas en viron
ment, bur ied, in su lated or oth er wise
de nied di rect at mos pheric ex po sure.


Option -95OS:

OFFSHORE installations. Coating of
all exterior surfaces will be per Cashco
Paint Specs #S-1777 epoxy. Fasteners,
seat surfaces and corrosion resistant
parts excluded. Painting of fasteners
optional upon special request.

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