T208 Series
2
The Specications section on this page provides the ratings and other specications for the T208 Series. Factory
specication such as type, maximum inlet pressure, maximum temperature, maximum outlet pressure, spring
range and orice size are stamped on the nameplate fastened on the regulator at the factory.
Type T208: Tank Blanketing Vapor Recovery
regulator with control pressure range of
2 inches w.c. to 7 psig / 5 mbar to 0.48 bar in six
different spring ranges and has internal pressure
registration requiring no control line.
Type T208M: Similar to Type T208 but has a
blocked throat and a control line connection for
external pressure registration.
Body Sizes and End Connection Styles
See Table 1
Maximum Allowable Inlet (Casing) Pressure
(1)
See Table 1
Maximum Outlet Pressure
(1)
35 psig / 2.4 bar
Maximum Emergency Inlet Pressure to Avoid
Internal Parts Damage
(1)
With Nitrile (NBR) or Fluorocarbon (FKM)
diaphragm: 35 psig / 2.4 bar
With Fluorinated Ethylene Propylene (FEP)
diaphragm: 10 psig / 0.69 bar
Control Pressure Ranges
(1)
See Table 2
Class VI (Soft Seat)
Pressure Registration
Type T208: Internal
Type T208M: External
Material Temperature Capabilities
(1)(2)
Elastomer Parts
Nitrile (NBR): -40 to 180°F / -40 to 82°C
Fluorinated Ethylene Propylene (FEP):
-20 to 180°F / -29 to 82°C
Fluorocarbon (FKM): 40 to 300°F / 4 to 149°C
Ethylene Propylene Diene (EPDM):
-20 to 225°F / -29 to 107°C
Peruoroelastomer (FFKM): 0 to 300°F /
-18 to 149°C
Body Materials
Gray Cast Iron: -20 to 300°F / -29 to 149°C
WCC Carbon Steel: -20 to 300°F / -29 to 149°C
CF8M/CF3M Stainless Steel:
-40 to 300°F / -40 to 149°C
Spring Case Vent Connection
1/4 NPT
Diaphragm Case Control Line Connection
(Type T208M)
1/2 NPT
Approximate Weight
17.7 pounds / 8 kg
Product Description
The T208 Series vapor recovery regulators are direct-
operated. They are used to sense an increase in
vessel pressure and vent excessive internal vessel
pressure to an appropriate vapor recovery disposal
or reclamation system. They may also be used as
backpressure regulators or relief valves.
Type T208—The Type T208 has internal registration
requiring no control line.
Type T208M—The Type T208M has a blocked throat
and a control line connection for external registration.
Principle of Operation
The T208 Series vapor recovery regulators are used
to maintain a constant inlet (blanket) pressure with
the outlet owing to a system whose pressure is
lower than that at the inlet. When vessel pressure
increases above the setpoint of the regulator due
to pumping in or thermal heating, the force of the
control spring is overcome by pressure acting on
the diaphragm. This moves the disk away from
the orice, allowing gas to ow from the vessel to
the vapor recovery system. As vessel pressure is
reduced, the force of the back disk spring causes the
disk to move toward the orice, decreasing the ow of
gas out of the vessel. As vessel pressure drops below
the setpoint of the regulator, the disk will seat against
the orice, shutting off the gas ow.
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
2. See Table 4 for operating temperature ranges for available trim combinations.
(2 Seiten)
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