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Bulletin 74.2:T208

CONTROL PRESSURE RANGE

SPRING COLOR

SPRING WIRE DIAMETER SPRING FREE LENGTH

In. w.c. mbar In. mm In. mm

2.0 to 7.0

(1)(2)

5 to 17

(1)(2)

Red 0.085 2.2 3.63 92.2

3.0 to 13.0

(1)(2)

7 to 32

(1)(2)

Unpainted 0.105 2.7 3.75 95.3

10.0 to 26.0 25 to 65 Yellow 0.114 2.9 4.31 109

0.9 to 2.5 psig 62 to 172 Green 0.156 4.0 4.06 103

1.3 to 4.5 psig 90 to 310 Light Blue 0.187 4.8 3.94 100

3.8 to 7.0 psig 0.26 to 0.48 bar Black 0.218 5.5 3.98 101

1. To achieve the published control pressure range the spring case must be installed pointing down.

2. Do not use Fluorocarbon (FKM) diaphragm with these springs at diaphragm temperatures lower than 60°F / 16°C.

Table 3. Control Pressure Ranges and Spring Information

Table 5. T208 Series C

Coefcient and Flow Capacity

Table 4. Flow and Sizing Coefcients

ORIFICE SIZE REGULATING WIDE-OPEN

In. mm C

7/16 11 94 2.7 35.0 97 2.8 35.0

Table 2. Available Construction and Trim Materials

AVAILABLE CONSTRUCTION MATERIAL AVAILABLE TRIM OPTION

Body and

Casing

Guide Insert,

Stem and

Pusher Post

Diaphragm

Head

Lever

Assembly

Trim Option

Code

Diaphragm Material Disk and O-ring Material

Operating Temperature

Range

Gray cast iron,

WCC Carbon

steel or

CF8M/CF3M

Stainless steel

(1)

316 Stainless

Steel

304 Stainless

Steel

302 Stainless

Steel

Standard Nitrile (NBR) Nitrile (NBR) -40 to 180°F / -40 to 82°C

VV Fluorocarbon (FKM) Fluorocarbon (FKM) 40 to 300°F / 4 to 149°C

TV Fluorinated Ethylene Propylene (FEP) Fluorocarbon (FKM) 40 to 180°F / 4 to 82°C

TN Fluorinated Ethylene Propylene (FEP) Nitrile (NBR) -20 to 180°F / -29 to 82°C

TK Fluorinated Ethylene Propylene (FEP) Peruoroelastomer (FFKM) 0 to 180°F / -18 to 82°C

TE Fluorinated Ethylene Propylene (FEP) Ethylene Propylene Diene (EPDM) -20 to 180°F / -29 to 82°C

1. Pipe nipples and anges are 316 Stainless steel for anged body assemblies.

CONTROL PRESSURE

RANGE AND

SPRING COLOR

SET PRESSURE MINIMUM BUILDUP TO WIDE-OPEN VACUUM OUTLET PRESSURE

COEFFICIENT

CAPACITIES OF AIR

In. w.c. mbar In. w.c. mbar psig barg SCFH Nm

2.0 to 7.0 in. w.c. /

5 to 17 mbar

Red

2.0 5.0 4.02 10

0 0 3.1 192 5.1

2.5 0.17 3.5 1161 31.1

5 0.34 3.5 1488 39.9

4.0 10.0 3.62 9

0 0 2.6 226 6.1

2.5 0.17 3.5 1178 31.6

5 0.34 3.5 1500 40.2

3.0 to 13.0

in. w.c. /

7 to 32 mbar

Unpainted

10.0 25 5.99 15

0 0 2.0 268 7.2

2.5 0.17 3.5 1232 33.0

5 0.34 3.5 1539 41.2

10.0 to 26.0 in. w.c. /

25 to 65 mbar

Yellow

15 37 8.89 22.1

0 0 2.0 331 8.9

2.5 0.17 3.5 1279 34.3

5 0.34 3.5 1574 42.2

0.9 to 2.5 psig /

62 to 172 mbar

Green

1 psig 70 0.78 psig 54

0 0 2.2 499 13.4

2.5 0.17 3.6 1426 38.2

5 0.34 3.6 1687 45.2

1.3 to 4.5 psig /

90 to 310 mbar

Light Blue

2 psig 140 1.49 psig 103

0 0 2.3 752 20.2

2.5 0.17 3.8 1694 45.4

5 0.34 3.7 1904 51.0

3.8 to 7.0 psig /

0.26 to 0.48 bar

Black

5 psig 340 2.79 psig 192

0 0 2.2 1139 30.5

2.5 0.17 3.8 2286 61.3

5 0.34 3.8 2242 60.1

Installation

Install the T208 Series regulator using a straight run pipe of

the same size or larger as the regulator body. Flow through

the regulator body is indicated by the ow arrow attached

to the body. If a block valve is required, install a full ow

valve between the regulator and the blanketed vessel. To

achieve the established regulator capacities, the regulators

should be installed with the spring case barrel pointed down

(See Figure 1).

Emerson Process Management Regulator Technologies, Inc.

(Emerson™) provides an instruction manual with every

regulator shipped. Refer to this for complete installation,

operation and maintenance instructions. Included is a complete

listing of individual parts and recommended spare parts.

Overpressure Protection

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. The recovery

regulators are not intended to be used as an ASME certied

relief device for overpressure protection on a tank. They are to

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