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Bulletin 74.1:T205

Specications

The Specications section on this page provides the ratings and other specications for the T205 Series. Factory specication

such as type, maximum inlet pressure, maximum temperature, maximum outlet pressure, spring range and orice size are

stamped on the nameplate fastened on the regulator at the factory.

Product Congurations

Type T205: Tank blanketing regulator with outlet

pressure range of 1 in. w.c. to 7 psig / 2.5 mbar to

0.48 bar in seven different spring ranges and has

internal pressure registration requiring no downstream

control line.

Type T205M: Similar to Type T205 but has a blocked

throat and a downstream control line connection for

external pressure registration.

Body Sizes and End Connection Styles

See Table 1

Maximum Allowable Inlet Pressure

(1)

See Table 1

Maximum Operating Inlet Pressure

(1)

See Table 2

Maximum Outlet (Casing) Pressure

(1)

Gray cast iron: 35 psig / 2.4 bar

WCC Carbon steel or CF8M/CF3M Stainless steel:

75 psig / 5.2 bar

Maximum Emergency Outlet 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

Outlet (Control) Pressure Range

(1)

See Table 3

Shutoff Classication per ANSI/FCI 70-3-2004

Class VI (Soft Seat)

Pressure Registration

Type T205: Internal

Type T205M: External

Orice Size and Flow Coefcients

See Table 5

Body and Casing Materials

Gray cast iron, WCC Carbon steel and

CF8M/CF3M Stainless steel

(2)

Trim Materials

See Table 4

Flow Capacities

See Tables 7 to 10

Coefcients

See Tables 11 and 12

Material Temperature Capabilities

(1)(3)

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

Peruoroelastomer (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 T205M)

1/2 NPT

Approximate Weight

17.7 lbs / 8 kg

1. The pressure/temperature limits in this Bulletin and any applicable standard or code limitation should not be exceeded.

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

3. See Table 4 for operating temperature ranges for available trim combinations.

Introduction

T205 Series tank blanketing regulator is a direct-operated

and spring-loaded regulator (Figure 1). The regulator

prevents a stored liquid from vaporizing into the atmosphere,

reduces liquid combustibility and prevents oxidation or

contamination of the product by reducing its exposure

to air. T205 Series maintains a slightly positive pressure

and thereby reduces the possibility of tank wall collapse

during pump out operation. T205 Series is available in two

congurations: Type T205 for internal pressure registration

and Type T205M for external pressure registration.

Principle of Operation

T205 Series tank blanketing regulator controls the vapor space

pressure over a stored liquid. When liquid is pumped out of the

tank or vapors in the tank condense, the pressure in the tank

decreases. Tank pressure is sensed by the actuator diaphragm.

Spring force pushes the pusher post assembly, the valve disk

moves away from the orice, allowing the gas ow to increase

to maintain tank pressure. See Figures 2 and 3.

When pressure in the tank increases, the actuator

diaphragm is pushed. Through the action of the pusher post

assembly, lever and valve stem, the valve disk moves closer

to the orice reducing gas ow.

1 2 3 4 5 6 7 ... 31 32

Bulletin 74.1:T205 1

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