Emerson 112 Instruction Manual

Instruction Manual
Form 5864

September 2008

Type 112 Restrictor

Type 112

Introduction

Scope of Manual

This instruction manual provides technical

specications, installation, startup, adjustment, and

parts ordering information for the Type 112 restrictor.

Product Description

The 112 Restrictors are mainly used in natural gas,
air, or other non-corrosive gas applications. Their

installation is foreseen together with a Type 161 pilot
for Pressure Regulators Type EZR.

Specications

The Specication section lists pressure limitations and
other specications for Type 112 Restrictor.

Principle of Operation

The Type 112 restrictor controls the regulator’s
proportional band (droop) and speed of response.

The restrictor can be used to ne tune the regulator

for maximum performance by decreasing the restrictor

setting for tighter control (increased opening speed,

decreased closing speed); or increasing the restrictor
setting for maximum stability (decreased opening

speed, increased closing speed). A lower setting

also provides a narrower proportional band for better

accuracy. The “8” position has the largest ow, is
most stable, and easiest for startup, however, using

the “8” position is not necessary. The “0” setting has

the smallest (minimum) ow passage; at no point

of rotation will the Type 112 restrictor be completely

shutoff. After initial adjustment, the restrictor does not
need to be adjusted for maintenance or startup.

Startup and Adjustment

Startup for Both Single-Regulator and
Monitoring Installations

1. Make sure all block and vent valves are closed.

2. Back out the pilot adjusting screw(s).

3. For easy initial startup, set the restrictor to the “8”
position. For future startups, the restrictor can be

left in the desired run position.

4. SLOWLY OPEN the valves in the following order:

a. Pilot supply and control line valve(s), if used

b. Inlet block valve

c. Outlet block valve

5. For a 161 Series pilot with Type 112 restrictor,

turn the restrictor(s) to position “2” or to desired
run position. Set then the pilot to the desired
outlet (control) pressure according to the pilot

adjustment procedure. Refer to Tables 2 and 3 for

recommended settings.

Maintenance

Type 112 Restrictor

Perform this procedure only if O-rings are leaking.

Key numbers are referenced in Figure 2.

1. Unscrew the groove valve (key 22) and retainer

(key 23) just enough to loosen them, but do not

completely separate.

2. Push on the retainer (key 23) to push the groove

valve (key 22) out of the body (key 21), then

complete disassembly.

3. Replace the groove valve O-rings (key 24) if
necessary, being sure to lightly apply lubricant to
the replacement O-rings before installing them in

the groove valve (key 22) and retainer (key 23).

www.emersonprocess.com/regulators

D103237X012

Type 112

Specications

Maximum Inlet Pressure and Pressure Drops

Restrictor: 1500 psig (103 bar)

Flow Coefcients

Restrictor: See Table 1

(1)

Construction Materials

Body: CB7Cu-2 Stainless steel
Groove Valve: 416 Stainless steel
Retainer: 416 Stainless steel
Pipe Plug: 316 Stainless steel
O-rings: Fluorocarbon (FKM)

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

Table 1.  Restrictor Flow Coefcients

SET ON START SET ON RUN

C

g

6 0.17 1 0.03 35

C

V

C

g

C

V

Table 2.  Adjustment Recommendations with 161 and 161EB Series Pilot

SERIES

161 / 161H Pilots

161EB Pilots

Note: Higher Type 112 restrictor setting will increase proportional band. Adjustment of the Type 112 restrictor will also cause a shift in setpoint. Setpoint should be checked and
adjusted following restrictor setting adjustment.

RECOMMENDED TYPE 112

RESTRICTOR SETTINGS FOR LOW

FLOW OPERATION

Restrictor Setting of “5” or Greater

TYPE 112 RESTRICTOR SETTINGS
TO AVOID LOW FLOW OPERATION

Restrictor Setting of “2” or less if continuous

ows are expected to be less than 5% of

maximum capacity

C

1

Table 3.  Adjustment Recommendations with 161AY / 161AYM Series Pilot

SERIES

161AY Pilots Restrictor Setting of “5” or greater

Note: Higher Type 112 restrictor setting will increase proportional band. Adjustment of the Type 112 restrictor will also cause a shift in setpoint. Setpoint should be checked and
adjusted following restrictor setting adjustment.

2

RECOMMENDED TYPE 112

RESTRICTOR SETTINGS FOR LOW

FLOW OPERATION

RECOMMENDED ORIFICE SIZE(S)

FOR LOW FLOW OPERATION

3/32 or 1/8-inch (2,38 or 3,18 mm)

(3/32-inch (2,38 mm) is standard)

TYPE 112 RESTRICTOR SETTINGS

AND ORIFICE SIZES TO AVOID

LOW FLOW OPERATION

Restrictor Setting of “2” or less if

continuous ows are expected to be

less than 5% of maximum capacity

Type 112

STAMPED INDICATOR
MARK AND “B” TO BE
ORIENTED WITH HEX
AND V-GROOVE AS SHOWN

PILOT SUPPLY CONNECTION

1/4-INCH NPT PIPE TO UPSTREAM

PILOT SUPPLY TAP

V-GROOVE

20B4403

LOADING CONNECTION 1/4-INCH NPT
PIPE TO TYPE EZR DIAPHRAGM
LOADING PORT

HI CAP GROOVE VALVE

OUTLET CONNECTION 1/4-INCH NPT
PIPE TO PILOT INLET CONNECTION

11B5004

Figure 1. Type 112 Restrictor Port Function and Connection Sizes

4. Install the groove valve (key 22) into the same
side of the body where the scale appears. Install
the retainer (key 23) into the opposite side of the

body, and tighten until both are secure.

5. When all maintenance is complete, refer to
the Startup and Adjustment section to put the

regulator back into operation.

OPTIONAL LOADING
CONNECTION
1/4-INCH NPT NORMALLY
PLUGGED

Parts Ordering

When corresponding with your local Sales Ofce about
this equipment, always reference the equipment serial

number or FS number found on a nameplate attached

to the bonnet. When ordering replacement parts,
reference the complete 11-character part number of

each needed part as found in the following parts list.

3

Type 112

2114

20B4393-D

APPLY LUBRICANT

Figure 2. Type 112 Restrictor Assembly

Parts List

Type 112 Restrictor (Figure 2)

Key Description Part Number

14 Pipe Plug, 316 Stainless steel 1A767535072

21 Body, CB7Cu-2 Stainless steel 20B4429X012

22 Groove Valve, 416 Stainless steel 20B4403X012

22

24

23

Key Description Part Number

23 Retainer, 416 Stainless steel 10B4402X012

24* Groove Valve O-ring (2 required),

Fluorocarbon (FKM) 1C8538X0052

* Recommended spare part

Industrial Regulators
Regulator Division
Emerson Process Management

USA - Headquarters
McKinney, Texas 75070 USA
Tel: [phone]
Outside U.S. 1-972-548-3574

Asia-Pacic
Shanghai, China 201206
Tel: [phone]

Europe

Bologna, Italy 40013
Tel: [phone]

For further information visit www.emersonprocess.com/regulators

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, Inc., a

business of Emerson Process Management.

The contents of  this publication are  presented for informational  purposes only, and while  every effort 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. We reserve the right to modify or improve the designs or specications of such 
products at any time without notice.

Emerson Process Management 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 product remains solely with the purchaser.

Natural Gas Technologies
Regulator Division
Emerson Process Management

USA - Headquarters
McKinney, Texas 75070
Tel: [phone]
Outside U.S. 1-972-548-3574

Asia-Pacic
Singapore, Singapore 128461

Tel: [phone]

Europe

Bologna, Italy 40013
Tel: [phone]
Gallardon, France 28320

Tel: [phone]

TESCOM
Regulator Division
Emerson Process Management

USA - Headquarters
Elk River, Minnesota 55330 USA
Tel: [phone]

Europe

Selmsdorf, Germany 23923
Tel: [phone]

©Fisher Controls International, Inc., 2008; All Rights Reserved