Emerson T205 Instruction Manual

Instruction Manual
D103748X012

September 2020

T205 Series

T205 Series Tank Blanketing Regulators

Table of Contents

Introduction .................................................................. 1

Specifications .............................................................. 2

Principle of Operation .................................................. 4

Installation ................................................................... 4

Overpressure Protection.............................................. 6

Startup, Adjustment and Shutdown .............................6

Maintenance ................................................................ 7

Parts Ordering ........................................................... 10

Parts List....................................................................10

Figure 1. Type T205 Tank Blanketing Regulator

WARNING

▲

Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,

re and/or chemical contamination

causing property damage and personal
injury or death.

Fisher™ regulators must be installed,
operated and maintained in accordance
with federal, state and local codes, rules
and regulations and Emerson Process
Management Regulator Technologies
Inc. (Emerson) instructions.

If the regulator discharges process

uid or a leak develops in the system,
service to the unit may be required.

Failure to correct trouble could result in
a hazardous condition.

Call a qualied service person to service

the unit. Installation, operation and
maintenance procedures performed by

unqualied person may result

in improper adjustment and unsafe
operation. Either condition may result in
equipment damage or personal injury.

Only a qualied person must install or
service the T205 Series regulator.

Introduction

Scope of the Manual

This Instruction Manual provides instruction
for installation, startup, maintenance and parts
ordering information for the T205 Series tank
blanketing regulators.

Product Description

T205 Series tank blanketing regulator is a direct­operated and spring-loaded regulator. 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

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 di󰀨erent 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.

Type T205H: Similar to Type T205, except outlet

(casing) pressure rating equals the inlet rating
(both 150 psig / 10.3 bar) and low temperature to

-20°F / -29°C.

Type T205HM: Similar to Type T205M, except

outlet (casing) pressure rating equals the
inlet rating (both 150 psig / 10.3 bar) and low
temperature to -20°F / -29°C

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)

Types T205 and T205M

Gray cast iron: 35 psig / 2.4 bar
WCC Carbon steel, LCC Carbon steel or
CF8M/CF3M Stainless steel: 75 psig / 5.2 bar

Types T205H and T205HM

WCC Carbon steel or CF8M/CF3M Stainless steel:

150 psig / 10.3 bar

Outlet (Control) Pressure Ranges

(1)

See Table 3

Shuto󰀨 Classication per ANSI/FCI 70-3-2004

Class VI (Soft Seat)

Pressure Registration

Types T205 and T205H: Internal
Types T205M and T205HM: External

Material Temperature Capabilities

(1)(2)(4)

Elastomer Parts
Nitrile (NBR):

Types T205 and T205M: -40 to 180°F / -40 to 82°C
Types T205H and T205HM: -20 to 180°F /

-29 to 82°C

Fluorinated Ethylene Propylene (FEP)

(3)

:

-20 to 180°F / -29 to 82°C

Fluorocarbon (FKM)
Ethylene Propylene Diene (EPDM)

(3)

: 40 to 300°F / 4 to 149°C

(3)

:

-20 to 225°F / -29 to 107°C

Peruoroelastomer (FFKM)

(3)

:

0 to 300°F / -18 to 149°C

Body Materials

Gray cast iron

(3)

: -20 to 300°F / -29 to 149°C
WCC Carbon steel: -20 to 300°F / -29 to 149°C
LCC Carbon steel: -40 to 300°F / -40 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
(Types T205M and T205HM)

1/2 NPT

Approximate Weight

17.7 lbs / 8 kg

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

2. See Table 5 for operating temperature ranges for available trim combinations.

3. Not available for Types T205H and T205HM.

4. Special low temperature constructions for process temperatures between -76 to 180°F / -60 to 82°C are available by request. The low temperature construction passed Emerson
laboratory testing for lockup and external leakage down to -76°F / -60°C.

Table 1. Body Sizes, End Connection Styles and Maximum Allowable Inlet Pressures

BODY SIZE

In. DN psig bar

3/4 or 1 20 or 25

1. All anges are welded. Weld-on ange dimension is 14 in. / 356 mm face-to-face.

2. Not available for Types T205H and T205HM.

3. Inlet pressure is limited to 150 psig / 10.3 bar for Types T205H and T205HM.

4. Pipe nipples and anges are 316 Stainless steel for anged body assemblies.

2

BODY MATERIAL END CONNECTION STYLES

Gray cast iron

WCC Carbon steel

LCC Carbon steel

CF8M/CF3M Stainless steel

(2)

(4)

CL300 RF or PN 16/25/40 RF

NPT 150 10.3

NPT, CL150 RF,

(1)

MAXIMUM ALLOWABLE INLET PRESSURE

(3)

200

13.8

(3)

T205 Series

ERSA02735

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

VALVE DISK

STEM

LEVER

PUSHER POST

PITOT TUBE

CONTROL SPRING

Figure 2. Types T205 and T205H with Internal Registration Operational Schematics

PIPE PLUG

DIAPHRAGM

TYPE Y602-1 VENT

Table 2. T205 Series Maximum Operating Inlet Pressure

MAXIMUM OPERATING INLET PRESSURE

ORIFICE SIZE

1 to 2.5 In. w.c. /

2.5 to 6.2 mbar

Outlet (Control)

Pressure Setting

2.5 to 7 In. w.c. /

6.2 to 17 mbar

Outlet (Control)

Pressure Setting

7 to 16 In. w.c. /

17 to 40 mbar

Outlet (Control)

Pressure Setting

0.5 to 1.2 psig /
34 to 83 mbar

Outlet (Control)

Pressure Setting

In. mm psig bar psig bar psig bar psig bar psig bar psig bar psig bar

1/8 3.2 200

(2)

1/4 6.4 125 8.62 175

13.8

(2)

200

(2)

(2)

13.8

12.1

(2)

(2)

3/8 9.5 60 4.14 80 5.52 200

3/4 In. / DN 20 Body Size

(2)

200
200

13.8

(2)

13.8

(2)

13.8

(2)

(2)

(2)

200
200
200

(2)

(2)

(2)

13.8

13.8

13.8

(2)

(2)

(2)

1/2 13 30 2.07 40 2.76 125 8.62 150 10.3 200

9/16 14 20 1.38 30 2.07 100 6.89 125 8.62 200

1/8 3.2 200

(2)

13.8

(2)

200

(2)

13.8

(2)

200

(2)

1 In. / DN 25 Body Size

13.8

(2)

200

(2)

13.8

(2)

1/4 6.4 100 6.89 150 10.3 150 10.3 150 10.3 200
3/8 9.5 40 2.76 80 5.52 150 10.3 150 10.3 200
1/2 13 30 2.07 40 2.76 125 8.62 150 10.3 200

9/16 14 20 1.38 15 1.03 100 6.89 125 8.62 200

1. At maximum inlet pressure, minimum achievable setpoints may vary based on process conditions.

2. Inlet pressure is limited to 150 psig / 10.3 bar for gray cast iron bodies and for Types T205H and T205HM.

(1)

1.2 to 2.5 psig /
83 to 172 mbar

Outlet (Control)

Pressure Setting

(2)

200
200
200

200

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

2.5 to 4.5 psig /

0.17 to 0.31 bar

Outlet (Control)

Pressure Setting

(2)

200
200
200
200
200

200
200
200
200
200

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

13.8

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

4.5 to 7 psig /

0.31 to 0.48 bar

Outlet (Control)

Pressure Setting

(2)

200

(2)

200

(2)

200

(2)

200

(2)

200

(2)

200

(2)

200

(2)

200

(2)

200

(2)

200

Table 3. Outlet (Control) Pressure Ranges and Spring Information

OUTLET (CONTROL) PRESSURE RANGE

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

1 to 2.5

2.5 to 7

(1)(2)

(1)

2.5 to 6.2

6.2 to 17

(1)(2)

(1)

SPRING PART NUMBER SPRING COLOR

1B558527052 Orange 0.072 1.8 3.25 82.6
1B653827052 Red 0.085 2.2 3.63 92.2

7 to 16 17 to 40 1B653927022 Unpainted 0.105 2.7 3.75 95.2

0.5 to 1.2 psig 34 to 83 1B537027052 Yellow 0.114 2.9 4.31 109

1.2 to 2.5 psig 83 to 172 1B537127022 Green 0.156 4.0 4.06 103

2.5 to 4.5 psig 0.17 to 0.31 bar 1B537227022 Light Blue 0.187 4.8 3.94 100

4.5 to 7 psig 0.31 to 0.48 bar 1B537327052 Black 0.218 5.5 3.98 101

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

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

SPRING WIRE DIAMETER SPRING FREE LENGTH

13.8

13.8

13.8

13.8

13.8

13.8

13.8

13.8

13.8

13.8

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

3

T205 Series

VALVE DISK

ERSA02736

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

O-RING STEM SEAL

THROAT SEAL

CONTROL SPRING

PUSHER POST

TYPE Y602-1 VENT

CONTROL LINE
CONNECTION

Figure 3. Types T205M and T205HM with External Registration Operational Schematics

T205 Series is available in four congurations:

Types T205 and T205H for internal pressure
registration requiring no downstream control line and
Types T205M and T205HM which have a blocked
throat and a downstream control line connection 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 upward, 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 downward. Through the action
of the pusher post assembly, lever and valve stem,

the valve disk moves closer to the orice reducing
gas ow.

Installation

WARNING

▲

Personal injury, property damage,
equipment damage or leakage due to

escaping gas or bursting of pressure-

containing parts may result if this regulator

is overpressured or installed where
service conditions could exceed the limits
given in the Specications section or

where conditions exceed any ratings of
the adjacent piping or piping connections.

Refer to Overpressure Protection section
for recommendations on how to prevent
service conditions from exceeding

those limits.

To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices (as required by the appropriate
code, regulation or standard) to prevent
service conditions from exceeding limits.

4

HORIZONTAL PIPELINE

T205 Series

HORIZONTAL PIPELINE

B2626

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

LOADING PRESSURE

TYPES T205 AND T205H TYPES T205M AND T205HM

Figure 4. T205 Series Actuator Casing Drainage Schematics

Additionally, physical damage to the
regulator could cause personal injury or
property damage due to escaping gas. To

avoid such injury or damage, install the

regulator in a safe location.

Note

If the regulator is shipped mounted on
another unit, install that unit according to
the appropriate Instruction Manual.

1. Only personnel qualied through training and

experience shall install, operate and maintain a
regulator. For a regulator that is shipped separately,
make sure there is no damage to or debris in the
regulator. Also ensure that all tubing and piping are
clean and unobstructed.

2. The regulator may be installed in any position as

long as the ow through the body is in the direction

indicated by the arrow on the body. When using
a T205 Series regulator, for proper operation to
achieve the published capacities at low setpoint,
the spring case barrel should be installed pointed
down as shown in Figure 1. For complete actuator
drainage, the regulator should be installed as shown
in Figure 4. If continuous operation of the system is
required during inspection or maintenance, install a
three-valve bypass around the regulator.

WARNING

▲

A regulator may vent some gas to the
atmosphere. In hazardous or ammable
gas service, vented gas may accumulate

and cause personal injury, death or

property damage due to re or explosion.

VENT POINTED DOWN

DOWNSTREAM CONTROL LINE

Vent a regulator in hazardous gas service

to a remote, safe location away from air

intakes or any hazardous area. The vent

line or stack opening must be protected
against condensation or clogging.

3. To keep the spring case vent (key 26, Figures 7 to 10)
from being plugged or the spring case from collecting
moisture, corrosive chemicals or other foreign
material, point the vent down or otherwise protect it.
The diaphragm casing (key 4, Figures 7 to 10) may
be rotated in order to obtain desired positioning.

4. To remotely vent the regulator, remove the vent
(key 26, Figures 7 to 10) and install obstruction­free tubing or piping into the 1/4 NPT vent tapping.
Provide protection on a remote vent by installing
a screened vent cap into the remote end of the
vent pipe.

5. Types T205M and T205HM require a downstream
control line. Be sure to install the control line before
putting the regulator into operation. Make the control
line as short and straight as possible and do not

install it in a location where ow may be turbulent.

Restrictions in the control line can prevent proper
pressure registration. When using a hand valve, it

should be a full ow valve, such as a full port ball

valve. Install the control line sloping downward toward
the tank to prevent condensation buildup and avoid
low points (or traps) that could catch liquid. The
sensing line must enter the tank above the liquid level
at a point that senses the vapor space pressure and
is free from turbulence associated with tank nozzles
or vents. The control line pipe should be at least
1/2 in. / 13 mm in diameter and increase 1 pipe size
for every 10 ft. / 3.05 m of control line, with setpoint
less than 5 in. w.c. / 12 mbar.

5

T205 Series

BODY SEAL

O-RING (KEY 11)

Seal O-ring and Backup Ring Placement

BACKUP RING

(KEY 49)

BODY
(KEY 1)

COTTER PIN (KEY 15)

Figure 6. Proper Bending of Cotter Pin (key 15)Figure 5. Expanded View of the Body Area Showing the Body

6. An upstream shuto󰀨 valve is recommended to

simplify maintenance to the regulator. It is advisable
to install a pressure gauge between the upstream

shuto󰀨 valve and the blanketing valve.

Overpressure Protection

WARNING

▲

Personal injury, equipment damage or
leakage due to escaping accumulated

gas or bursting of pressure-containing

parts may result if this regulator is:

• Overpressured;

• Used with incompatible

process uid;

• Installed where service conditions
could exceed the limits given in the
Specications section and on the
appropriate nameplate; or

• Where conditions exceed any
ratings of adjacent piping or
piping connections.

To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices to prevent service conditions

from exceeding those limits.
If the regulator is exposed to an

overpressure condition, it should be
inspected for any damage that may have

occurred. Regulator operation below

the limits specied in the Specications

section and regulator nameplate does
not preclude the possibility of damage
from external sources or from debris in
the pipeline.

Types T205 and T205M regulators have an outlet
pressure rating lower than their inlet pressure rating.
Types T205H and T205HM regulators have an outlet

pressure rating equal to the inlet pressure rating. The
recommended pressure limitations are stamped on
the regulator nameplate. Some type of overpressure
protection is needed if the actual inlet pressure can
exceed the maximum operating outlet pressure rating.
Common methods of external overpressure protection

include relief valves, monitoring regulators, shut-o󰀨

devices and series regulation. Overpressuring any
portion of the regulators beyond the limits in the

Specications section may cause leakage, damage

to regulator parts or personal injury due to bursting of
pressure-containing parts.

Startup, Adjustment and Shutdown

Note

The Specications section and
Tables 1 and 2 provide the maximum

pressure capabilities for each regulator
construction. Use pressure gauges
to monitor inlet pressure and outlet
pressure during startup.

Startup

1. Open shuto󰀨 valves between the tank blanketing

regulator and the tank (both sensing and outlet).

2. Slowly open the supply line shuto󰀨 valve (to the

blanketing valve) and leave it fully open.

3. Monitor the tank vapor space pressure.

Adjustment

WARNING

▲

To avoid personal injury, property damage

or equipment damage caused by bursting
of pressure containing parts or explosion

of accumulated gas, never adjust the

control spring to produce an

6

Table 4. Body Materials and Part Numbers (Body, key 1)

BODY MATERIAL END CONNECTION STYLE

Gray cast iron

WCC Carbon steel

LCC Carbon steel NPT ERSA00230A8 ERSA00194A5

CF8M/CF3M Stainless steel

1. All anges are welded. Weld-on ange dimension is 14 in. / 356 mm face-to-face.

2. Gray cast iron is not available for Types T205H and T205HM.

3. NACE Standard MR0175-2002.

(2)

NPT ERSA01588A0 ERSA01755A0

NPT ERSA00230A1 ERSA00194A1

CL150 RF ERSA01469A0 ERSA01469A1

CL300 RF ERSA01469A2 ERSA01469A3

PN 16/25/40 RF ERSA01469A4 ERSA01469A5

(3)

NPT

CL150 RF ERSA01469A6 ERSA01469A7

CL300 RF ERSA01469A8 ERSA01469A9

PN 16/25/40 RF ERSA01469B0 ERSA01469B1

T205 Series

(1)

3/4 in. / DN 20 Body 1 in. / DN 25 Body

ERSA00230A0 ERSA00194A0

PART NUMBER

outlet pressure higher than the upper limit
of the outlet pressure range (see Table 2)
for that particular spring. If the desired
outlet pressure is not within the range of
the control spring, install a spring of the
proper range according to the Diaphragm
and Spring Case Area section of the
maintenance procedure.

Adjust the regulator control pressure setting to meet the

requirements of the specic application. With a spring-

loaded regulator, the pressure setting may be adjusted
to a value within the spring range shown in Table 3. To
adjust the pressure setting, perform the following steps
(key numbers are referenced in Figures 7 to 10):

For internal at circular adjusting screw:

1. Remove the closing cap (key 22).

2. Use a 1 in. / 25 mm hex rod or at screwdriver to

turn the adjusting screw (key 35) either clockwise
to increase outlet pressure or counterclockwise to
decrease outlet pressure. The regulator will go into
immediate operation. To ensure correct operation,
always use a pressure gauge to monitor the tank
blanketing pressure when making adjustments.

3. After making the adjustment, replace the closing cap
gasket (key 25) and install the closing cap (key 22).

Shutdown

1. Close the nearest upstream shuto󰀨 valve.

2. Close the nearest downstream shuto󰀨 valve to

vent the regulator properly.

3. For a regulator with control line: Close the valve in
the control line and vent the diaphragm casing to
the atmosphere.

4. Open the vent valve between the regulator and

the downstream shuto󰀨 valve nearest to it. All
pressure between these shuto󰀨 valves is released

through the open vent valve, since a T205 Series
remains open in response to the decreasing
downstream pressure.

Maintenance

Regulator parts are subject to normal wear and
must be inspected and replaced as necessary. The
frequency of inspection and replacement of parts
depends upon the severity of service conditions
or the requirements of local, state and federal
regulations. Due to the care Emerson takes in
meeting all manufacturing requirements (heat treating,
dimensional tolerances, etc.), use only replacement
parts manufactured or furnished by Emerson.

For external square head adjusting screw:

1. Loosen the locknut (key 20).

2. Turn the adjusting screw (key 35) either clockwise
to increase outlet pressure or counterclockwise
to decrease outlet pressure. Always use pressure
gauge to monitor the tank blanketing gas pressure
when making adjustments.

3. After making the adjustment, tighten the locknut
(key 20).

WARNING

▲

To avoid personal injury, property

damage or equipment damage caused by
sudden release of pressure or explosion
of accumulated gas, do not attempt any
maintenance or disassembly without

rst isolating the regulator from system
pressure and relieving all internal

pressure from the regulator.

7

T205 Series

Table 5. T205 Series Trim Option Code

TRIM OPTION CODE DIAPHRAGM MATERIAL DISK AND O-RING MATERIAL OPERATING TEMPERATURE RANGE

Standard Nitrile (NBR)

EE

(5)

FDA

VV Fluorocarbon (FKM) Fluorocarbon (FKM) 40 to 300°F / 4 to 149°C
TN Fluorinated Ethylene Propylene (FEP) Nitrile (NBR) -20 to 180°F / -29 to 82°C
TV Fluorinated Ethylene Propylene (FEP) Fluorocarbon (FKM) 40 to 180°F / 4 to 82°C

(1)

TK

1. Includes 316 Stainless steel trim parts.

2. Types T205 and T205HM are only available with Nitrile (NBR) diaphragm.

3. Gray Cast iron and WCC Carbon steel bodies are limited to -20 to 300°F / -29 to 149°C.

4. Special low temperature constructions for process temperatures between -76° to 180°F / -60 to 82°C are available by request. The low temperature construction passed Emerson

5. EPDM option available with FDA and USP Class VI approved elastomers (wetted components only).

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

laboratory testing for lockup and external leakage down to -76°F / -60°C.

Fluorinated Ethylene Propylene (FEP) Perfluoroelastomer (FFKM) 0 to 180°F / -18 to 82°C

(2)

EPDM EPDM -20 to 225°F / -29 to 107°C

Nitrile (NBR)

Types T205 and T205M: -40 to 180°F / -40 to 82°C

Types T205H and T205HM: -20 to 180°F / -29 to 82°C

(3)(4)

Regulators that have been disassembled

for repair must be tested for proper
operation before being returned to

service. Only parts manufactured by

Emerson should be used for repairing
Fisher™ regulators. Restart gas
utilization equipment according to
normal startup procedures.

General Maintenance

1. Visually inspect the regulator and its parts for
any damage.

2. Ensure tight connections, tight seals and safe
operation. If there is evidence of leakage or
unstable internal motion, a rebuild with seal
replacement and relubrication may be necessary.

3. Observe the blanketing pressure.

4. Inspect the inlet pressure for the proper pressure
(stamped on the regulator nameplate).

Body Area

Perform the following procedure to gain access to the

disk assembly, orice, body O-ring and pitot tube if used.

Release all pressure from the diaphragm casing and
open the disk assembly before performing the following
steps. Key numbers are referenced in Figures 7 to 10.

1. Remove the cap screws (key 2) and separate the
diaphragm casing (key 4) from the body (key 1).

2. Remove and inspect the body seal O-ring (key 11)
and the backup ring (key 49). See Figure 5.

3. Inspect and replace the orice (key 5) if necessary.
Protect the orice seating surface during disassembly

and assembly. Lubricate the threads of the

replacement orice with a good grade of light grease

and install with 340 to 470 in-lbs / 38.5 to 53.1 N•m
of torque.

4. Remove the cotter pin (key 15) to replace the disk
assembly (key 13). If not necessary, skip to step 8.

5. To replace the pitot tube (key 32, Figures 7 and 9)
on the Types T205 and T205H, remove the pitot
tube machine screws (key 17), install the new pitot
tube and secure with the pitot tube machine screws
(key 17) using 14 to 19 in-lbs / 1.6 to 2.1 N•m of
torque. Position the pitot tube so that it points into the
outlet of the body by rotating the guide insert (key 18).

6. To inspect the throat seal O-ring (key 31, Figures 8
and 10) on the Types T205M and T205HM, remove
the machine screw (key 34, Figures 8 and 10).
Replace if necessary and reassemble.

7. Install the disk assembly (key 13) and secure it with
the cotter pin (key 15). Bend the cotter pin end using
pliers or equivalent tool (see Figure 6).

8. Place back-up ring (key 49) into the body (key 1).
Then place the body seal O-ring (key 11) into the
body. See Figure 5.

9. Place the diaphragm casing (key 4) on the body
(key 1). Secure the diaphragm casing to the body
with the cap screws (key 2) using 90 to 126 in-lbs /

10.2 to 14.2 N•m of torque.

Diaphragm and Spring Case Area

Perform the following procedure to gain access to the
spring, diaphragm, lever assembly and stem. Release
all pressure from the diaphragm casing before
performing the following steps.

Note

Remove any remote control drive unit

used with a T205 Series regulator

from the spring case (key 3) before

performing these steps.

1. For internal at circular adjusting screw –
remove the closing cap (key 22) and closing cap
gasket (key 25).

For external square head adjusting screw –

loosen the locknut (key 20).

8

T205 Series

2. Turn the adjusting screw (key 35) counterclockwise
to remove all the compression from the control
spring (key 6).

3. If the only maintenance procedure to be performed is
the changing of the control spring (key 6):

For internal at circular adjusting screw:

a. Remove the adjusting screw (key 35).
b. Take out the control spring and replace with the

desired spring.
c. Reinstall the adjusting screw.
d. Adjust the outlet pressure to the desired control

pressure setting, refer to steps 2 and 3 of

Adjustment section.
e. Change the stamped spring range on the

nameplate. Skip to step 13.
For external square head adjusting screw:

a. Remove the adjusting screw (key 35) and

locknut (key 20).
b. Remove the closing cap (key 22), closing cap

gasket (key 25) and upper spring seat (key 19).
c. Take out the control spring and replace with the

desired spring.
d. Reinstall the upper spring seat, closing cap

gasket, closing cap, locknut and adjusting screw.
e. Adjust the outlet pressure to the desired control

pressure setting, refer to steps 2 and 3 of
Adjustment section.

f. Change the stamped spring range on the

nameplate. Skip to step 13.

4. If further maintenance to the internal diaphragm
casing parts is required, remove the hex nuts (key 23)
and spring case cap screws (key 24). Remove the
diaphragm (key 10) plus attached parts by tilting

them so that the pusher post (key 8) slips o󰀨 the

lever assembly (key 16). To separate the diaphragm
from the attached parts, unscrew the diaphragm
cap screw (key 38) from the pusher post. If the only
maintenance is the replacement of the diaphragm
components, skip to step 7.

5. To replace the lever assembly (key 16), remove
the machine screws (key 17). To replace the stem
(key 14), also perform Body Area Maintenance
procedure steps 1 and 4 and pull the stem out of
the lower casing (key 4). With Types T205M and
T205HM, grease the replacement stem seal O-ring
(key 30) with a good grade of lubricant and install it
on the stem (key 14).

6. Install the stem into the lower casing and perform
Body Area Maintenance procedure steps 7 through 9
as necessary.

7. Install the lever assembly (key 16) into the stem
(key 14) and secure the lever assembly with the
machine screws (key 17) using 14 to 19 in-lbs /

1.6 to 2.1 N•m of torque.

8. Hold the pusher post and place diaphragm assembly
parts on the pusher post in the following order:

• diaphragm head gasket (key 45)

• diaphragm head (key 7)

• diaphragm (key 10)

• diaphragm head

• lower spring seat (key 50)

• washer (key 36)

Secure with diaphragm cap screw (key 38) using the

following torque:

• Types T205 and T205M - 60 to 72 in-lbs /

6.8 to 8.1 N•m

• Types T205H and T205HM - 120 to 144 in-lbs /

13.6 to 16.3 N•m.

9. Install the pusher post (key 8) and attached parts
onto the lever (key 16).

10. Install the spring case (key 3) on the lower casing
(key 4) so that the vent assembly (key 26) is correctly
oriented and secure them with the spring case cap

screws (key 24) and hex nuts (key 23) to nger

tightness only.

11. Install the parts into the spring case (key 3). Follow
the order below:

For internal at circular adjusting screw:
a. control spring (key 6)
b. adjusting screw (key 35)

For external square head adjusting screw:
a. control spring (key 6)
b. upper spring seat (key 19)
c. closing cap gasket (key 25)
d. closing cap (key 22)
e. locknut (key 20)
f. adjusting screw (key 35)

12. Turn the adjusting screw (key 35) clockwise until
there is enough control spring force to provide proper
slack to diaphragm (key 10). Using a crisscross

pattern, nish tightening the spring case cap

screws (key 24) and hex nuts (key 23) with the
following torque:

• Types T205 and T205M - 98 to 126 in-lbs /

11.1 to 14.2 N•m

• Types T205H and T205HM - 192 to 228 in-lbs /

21.7 to 25.8 N•m
Adjust the outlet pressure to the desired control
pressure setting, refer to the Adjustment section.

13. For Types T205M and T205HM, connect the
downstream control line. Refer to the Startup section
before putting the regulator back in operation.

9

T205 Series

To Convert Constructions

From Type T205 to Type T205M or

Type T205H to Type T205HM

A control line is needed. New parts required: keys 30,
31 and 17.

1. Remove pipe plug (key 27, Figures 7 and 9) from
the lower casing (key 4). Use this port to connect
the control line from downstream. See item
number 5 in the Installation section.

2. Refer to steps 1 and 5 in the Body Area
Maintenance section to remove the four pitot
tube machine screws (key 17) and pitot tube
(key 32, Figures 7 and 9).

3. Insert the throat seal O-ring (key 31, Figures 8
and 10) and one machine screw (key 34).

4. Insert the stem seal O-ring (key 30, Figures 8
and 10) by following steps 1 through 6
in the Diaphragm and Spring Case Area
Maintenance section.

From Type T205M to Type T205 or

Type T205HM to Type T205H

New parts required: keys 27, 32 and 17.

1. Insert pipe plug (key 27, Figures 7 and 9) in the
lower casing (key 4).

2. Follow steps 1, 3 and 4 of Diaphragm and Spring
Case Area Maintenance Section to remove one
machine screw (key 34, Figures 8 and 10), the
stem seal O-ring (key 30, Figures 8 and 10) and
the throat seal O-ring (key 31, Figures 8 and 10)
blocking the registration port.

3. Insert pitot tube (key 32, Figures 7 and 9) and four
pitot tube machine screws (key 17) using 14 to
19 in-lbs / 1.6 to 2.1 N•m of torque as outlined in
step 5 of the Body Area Maintenance section.

Parts Ordering

When corresponding with your local Sales O󰀩ce

about this regulator, include the type number and all
other pertinent information stamped on the nameplate.
Specify the eleven-character part number when
ordering new parts from the following parts list.

*Recommended spare part

1. NACE Standard MR0175-2002.

Parts List

Key Description Part Number

Spare Parts Kit (Included are keys 9, 10,
11, 12, 15, 25 and 45)
(see Table 6 for Trim Option Codes)
Standard Trim RT205XXDD12
EE Trim RT205XXEE12
FDA Trim RT205XFDA12
VV Trim RT205XXVV12
TN Trim RT205XXTN12
TV Trim RT205XXTV12
TK Trim RT205XXTK12
TE Trim RT205XXTE12

1 Body See Table 4
2 Cap Screw (2 required)
For WCC Carbon steel or Gray cast iron casing 1C856228992
For LCC Carbon steel or
CF8M/CF3M Stainless steel casing 18B3456X012
3 Spring Case
For Types T205 and T205M
Gray cast iron ERSA02558A0
WCC Carbon steel ERSA00195A1
LCC Carbon steel ERSA00195B0
CF8M/CF3M Stainless steel ERSA00195A0
3A Spring Case
Types T205H and T205HM
WCC Carbon steel ERAA12947A1
CF8M/CF3M Stainless steel ERAA12799A0
4 Lower Casing
Gray cast iron 47B2271X012
WCC Carbon steel
For Types T205 and T205M ERSA00196A1
For Types T205H and T205HM ERAA13233A1
LCC Carbon steel
For Types T205 and T205M ERSA00196C3
CF8M/CF3M Stainless steel
For Types T205 and T205M ERSA00196A0
For Types T205H and T205HM ERAA13233A0

5* Orice

Stainless steel (standard)
1/8 in. / 3.2 mm 1A936735032
1/4 in. / 6.4 mm 0B042035032
3/8 in. / 9.5 mm 0B042235032
1/2 in. / 13 mm 1A928835032
9/16 in. / 14 mm 1C425235032
Stainless steel (NACE)
1/8 in. / 3.2 mm 1A9367X0022
1/4 in. / 6.4 mm 0B0420X0012
3/8 in. / 9.5 mm 0B0422X0012
1/2 in. / 13 mm 1A9288X0012
9/16 in. / 14 mm 1C4252X0022
6 Spring See Table 3
7 Diaphragm Head, Stainless steel 17B9723X032
8 Pusher Post
For Nitrile (NBR), EPDM or
Fluorocarbon (FKM) diaphragm
Stainless steel (standard) 18B3462X032
Stainless steel (NACE)
For Fluorinated Ethylene
Propylene (FEP) diaphragm
Stainless steel (NACE)
9* Diaphragm Gasket
For Fluorinated Ethylene
Propylene (FEP) diaphragm
Nitrile (NBR) ERSA00713A0

(1)

(1)

18B3462X012

(1)

ERSA00876A0

10

T205 Series

Key Description Part Number Key Description Part Number

10* Diaphragm
Nitrile (NBR)
For Types T205 and T205M 17B9726X012
For Types T205H and T205HM ERAA12717A0
Fluorocarbon (FKM)
For Types T205 and T205M 23B0101X052
Fluorinated Ethylene Propylene (FEP)
For Types T205 and T205M ERSA00193A0
EPDM

(3)

For Types T205 and T205M 17B9726X032
11* Body Seal O-ring
Nitrile (NBR) 1H993806992
Fluorocarbon (FKM) 1H9938X0012

Peruoroelastomer (FFKM) 1H9938X0042

EPDM 1H9938X0022
EPDM

(3)

1H9938X0112
12* Insert Seal O-ring
Nitrile (NBR) 1B885506992
Fluorocarbon (FKM) 1B8855X0012

Peruoroelastomer (FFKM) 1B8855X0062

EPDM 1B8855X0022
EPDM

(3)

1B8855X0112
13* Disk Assembly
Stainless steel (standard)
Nitrile (NBR) 1C4248X0202
Fluorocarbon (FKM) 1C4248X0052
EPDM 1C4248X0302
Stainless steel (NACE)

(2)

Nitrile (NBR) 1C4248X0252
Fluorocarbon (FKM) 1C4248X0192

Peruoroelastomer (FFKM) 1C4248X0332

EPDM 1C4248X0152
EPDM

(3)

1C4248X1242
14 Stem
Stainless steel (standard) 17B3423X012
Stainless steel (NACE)

(2)

17B3423X022
15* Cotter Pin, Stainless steel 1A866537022
16 Lever Assembly, Stainless steel 1B5375000B2
17 Machine Screw, Stainless steel
Types T205 and T205H (6 required) 19A7151X022
Types T205M and T205HM (2 required) 19A7151X022
18 Guide Insert, Stainless steel 27B4028X022
19 Upper Spring Seat, Steel
Optional 1J618124092
20 Lock Nut

(1)

(1)

For Steel Adjusting Screw 1A413224122
For Stainless steel adjusting screw T1208735252
22 Closing Cap
For Internal Flat Circular Adjusting Screw
Plastic T11069X0012
Stainless steel 1E422735072
For External Square Head Adjusting Screw
Steel ERSA01809A0
Stainless steel ERSA01809A1
23 Hex Nut (8 required)
Types T205 and T205M
For WCC Carbon steel or Gray cast iron casing 1A345724122
For LCC Carbon steel or
CF8M/CF3M Stainless steel casing 1A3457K0012
Types T205H and T205HM
For WCC Carbon steel casing 1A352724122
For CF8M/CF3M Stainless steel casing 1E9440X0352

24 Spring Case Cap Screw (8 required)
Types T205 and T205M
For WCC Carbon steel or Gray cast iron casing 1A579724052
For LCC Carbon steel or
CF8M/CF3M Stainless steel casing 1A5797T0012
Types T205H and T205HM
For WCC Carbon steel casing ERCA00100A0
For CF8M/CF3M Stainless steel casing ERCA00100A1
25* Closing Cap Gasket, Neoprene (CR) 1P753306992
26 Vent Assembly
Spring Case Sideways (standard)
(Type Y602-12) 27A5516X012
Spring Case Down (Type Y602-1) 17A6570X012
Spring Case Up (Type Y602-11) 17A5515X012
27 Pipe Plug (Types T205 and T205H only)
Carbon steel (standard) 1A369224492
Stainless steel (NACE)

(2)

1A369235072
30* Stem Seal O-ring (Types T205M and T205HM only)
Nitrile (NBR) 1H2926G0012
Fluorocarbon (FKM) 1H2926X0022

Peruoroelastomer (FFKM) 1H2926X0042

EPDM 1H2926X0012
EPDM

(3)

1H2926X00A0
31* Throat Seal O-ring (Types T205M and T205HM only)
Nitrile (NBR) 1D682506992
Fluorocarbon (FKM) 1D6825X0012

Peruoroelastomer (FFKM) 1D6825X0032

EPDM 1D6825X0042
EPDM

(3)

1D6825X0102
32 Pitot Tube (Types T205 and T205H), Stainless steel 17B4479X012
34 Machine Screw, Types T205M and T205HM only
Stainless steel 18A0703X022
35 Adjusting Screw
Internal Flat Circular (standard) 1B537944012
Steel
For Green and Light Blue spring 10B3080X012
For Black spring 1D995448702
Stainless steel
For Green and Light Blue spring GE06080X012
For Black spring 1D9954X0032
36 Washer, Plated carbon steel 18B3440X012
38 Diaphragm Cap Screw, Zinc-plated steel 1B290524052
45* Diaphragm Head Gasket, Composition 18B3450X012
EPDM

(3)

18B3450X042
46 Nameplate - - - - - - - - - - ­47 Drive Screw, Stainless steel (2 required) 1A368228982
48 Flow arrow - - - - - - - - - - ­49 Backup Ring, Stainless steel 18B3446X012
50 Lower Spring Seat, Zinc-plated steel 1B636325062
51 NACE Tag - - - - - - - - - - ­52 Tag Wire - - - - - - - - - - ­54 Diaphragm Head ERAA12718A0

*Recommended spare part

1. Use for optional external square head adjusting screw assembly recommended for 1.2 to 2.5 psig / 83 to 172 mbar, 2.5 to 4.5 psig / 0.17 to 0.31 bar and 4.5 to 7 psig / 0.31 to 0.48 bar
spring ranges only.

2. NACE Standard MR0175-2002.

3. FDA and USP Class VI approved.

11

T205 Series

TORQUE:

14 TO 19 IN -LBS /

1.6 TO 2.1 N•m

17

13

L2

5

32

TORQUE:

340 TO 470 IN-LBS /

38.5 TO 53.1 N•m

49

15

L1

18

11

14

14 TO 19 IN -LBS /

1.6 TO 2.1 N•m

L1

12

L2

35

TORQUE:

60 TO 72 IN -LBS /

6.8 TO 8.1 N•m

TORQUE:

17

38

16

8

45

7

10

20

19

35

22

L2

6

EXTERNAL SQUARE HEAD ADJUSTING

SCREW ASSEMBLY OPTON

6

36

50

9

7

(2)

22

3

26

TORQUE:

98 TO 126 IN -LBS /

11.1 TO 14.2 N•m

24

23

27

ERSA02735

SPRING CASE SIDEWAYS SPRING CASE DOWNWARD SPRING CASE UPWARD

TYPE Y602-12 VENT TYPE Y602-1 VENT TYPE Y602-11 VENT

(1)

APPLY LUBRICANT

L1 = SILICONE GREASE

L2 = ANTI-SEIZE COMPOUND

1. Lubricants must be selected such that they meet the temperature requirements.

2. For 1.2 to 2.5 psig / 83 to 172 mbar, 2.5 to 4.5 psig / 0.17 to 0.31 bar and 4.5 to 7 psig / 0.31 to 0.48 bar spring ranges only.

:

4

17A6570-B 17A5515-D27A5516-C

25

46

47

48

1

2

TORQUE:

90 TO 126 IN-LB S /

10.2 TO 14.2 N•m

12

Figure 7. Type T205 Regulator Assembly with Internal Registration

TORQUE:

14 TO 19 IN -LBS /

1.6 TO 2.1 N•m

T205 Series

15

13

TORQUE:

340 TO 470 IN-LBS /

38.5 TO 53.1 N•m

49

34

5

L1

L1 L2L2

11

31

L1

18

30

14

L1

22

17

12

38

35

TORQUE:

60 TO 72 IN -LBS /

6.8 TO 8.1 N•m

16

45

8

10

7

20

19

35

22

L2

6

EXTERNAL SQUARE HEAD ADJUSTING

SCREW ASSEMBLY OPTON

36

50

6

9

7

(2)

25

3

26

TORQUE:

98 TO 126 IN -LBS /

11.1 TO 14.2 N•m

24

23

4

ERSA02736

APPLY LUBRICANT

L1 = SILICONE GREASE

L2 = ANTI-SEIZE COMPOUND

1. Lubricants must be selected such that they meet the temperature requirements.

2. For 1.2 to 2.5 psig / 83 to 172 mbar, 2.5 to 4.5 psig / 0.17 to 0.31 bar and 4.5 to 7 psig / 0.31 to 0.48 bar spring ranges only.

(1)

:

Figure 8. Type T205M Regulator Assembly with External Registration

46

47

48

1

TORQUE:

2

90 TO 126 IN -LBS /

10.2 TO 14.2 N•m

13

T205 Series

TORQUE:

340 TO 470 IN-LB S /

38.5 TO 53.1 N•m

5

32

L2

13

15

49

17

14 TO 19 IN -LBS /

1.6 TO 2.1 N•m

18

14

L1

11

TORQUE:

17

L2

12

16

TORQUE:

120 TO 144 IN-LB S /

13.6 TO 16.3 N•m

45

8

7

25

38

35

36

L2

6

50

26

54

27

3

10

4

22

46

47

ERAA13000

APPLY LUBRICANT

L1 = SILICONE GREASE

L2 = ANTI-SEIZE COMPOUND

1. Lubricants must be selected such that they meet the temperature requirements.

(1)

:

Figure 9. Type T205H Regulator Assembly with Internal Registration

24

TORQUE:

192 TO 228 IN-LBS /

21.7 TO 25.8 N•m

23

TORQUE:
90 TO 126 IN -LBS /

2

10.2 TO 14.2 N•m

47

48

1

35

20

22

SPRING ADJUSTMENT

ASSEMBLY OPTION

25

L2

19

6

14

T205 Series

L1

5

L2

TORQUE:

340 TO 470 IN-LB S /

38.5 TO 53.1 N•m

TORQUE:

14 TO 19 IN -LBS /

1.6 TO 2.1 N•m

30

31

L1

1712

1413 34

L1

18114915

L1

L2

TORQUE:

120 TO 144 IN-LB S /

13.6 TO 16.3 N•m

45

38

816

6

35 35 50

54

10

7

TORQUE:

192 TO 228 IN-LB S /

21.7 TO 25.8 N•m

25

3

26

24

23

22

46

47

4

ERAA13001

APPLY LUBRICANT

L1 = SILICONE GREASE

L2 = ANTI-SEIZE COMPOUND

1. Lubricants must be selected such that they meet the temperature requirements.

(1)

:

Figure 10. Type T205HM Regulator Assembly with External Registration

TORQUE:
90 TO 126 IN -LBS /

2

10.2 TO 14.2 N•m

47

48

1

35

20

25

19

6

SPRING ADJUSTMENT

ASSEMBLY OPTION

22

L2

15

T205 Series

[e-mail]

Fisher.com

Emerson Automation Solutions

Americas

McKinney, Texas 75070 USA
T [phone]

[phone]

Europe

Bologna 40013, Italy
T [phone]

The distinctive diamond shape cast into every spring
case uniquely identifies the regulator as part of the
Fisher™ brand and assures you of the highest-quality
engineering, durability, performance, and support.

Facebook.com/EmersonAutomationSolutions

LinkedIn.com/company/emerson-automation-solutions

Twitter.com/emr_automation

Asia Pacic

Singapore 128461, Singapore
T [phone]

Middle East and Africa

Dubai, United Arab Emirates
T [phone]

D103748X012 © 2013, 2020 Emerson Process Management Regulator
Technologies, Inc. All rights reserved. 09/20.
The Emerson logo is a trademark and service mark of Emerson Electric
Co. All other marks are the property of their prospective owners.
Fisher™ is a mark owned by Fisher Controls International LLC, a business
of Emerson Automation Solutions.

The contents of this publication are presented for informational purposes

only, and while every e󰀨ort has been made to ensure their accuracy,

they are not to be construed as warranties or guarantees, express or
implied, regarding the products or services described herein or their use
or applicability. All sales are governed by our terms and conditions, which
are available upon request. We reserve the right to modify or improve the

designs or specications of such products at any time without notice.

Emerson Process Management Regulator Technologies, Inc. does
not assume responsibility for the selection, use or maintenance of any
product. Responsibility for proper selection, use and maintenance of any
Emerson Process Management Regulator Technologies, Inc. product
remains solely with the purchaser.