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Types 66, 66Z, and 66ZZ

D100247X012

Instruction Manual

Form 1056

November 2008

www.emersonprocess.com/regulators

Types 66, 66Z, and 66ZZ Pressure 

Reducing Regulators

!

WaRning

Failure to follow these instructions or 

to properly install and maintain this 

equipment could result in an explosion 

and/or fire 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 Fisher instructions. 
if the regulator vents gas 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 gas service person to service 

the unit.  Only a qualified person must 

install or service the regulator.

introduction

Scope of the Manual

This instruction manual provides instructions for 

the installation, adjustment, and maintenance 

of the Types 66, 66Z, and 66ZZ pressure 

reducing regulators.  Parts ordering information 

is also provided.  Other 66 Series regulators and 

accessories are covered in other manuals.

Description

The Type 66 self-operated regulator (Figure 1) 

maintains a reduced outlet pressure while satisfying 

the downstream flow demands.  The Types 66Z and 

66ZZ self-operated regulators (Figures 8 and 9) also 

control a reduced outlet pressure; however, both have 

springs sensitive to negative pressures and can be 

used for vacuum regulation.  Each regulator type has 

a balancing diaphragm which increases accurate and 

sensitive response to pressure changes by reducing 

the unbalanced forces acting on the valve plug.  This 

regulator and its installation should be checked for 

compliance with all applicable codes.

Specifications

The Specifications table lists the specifications for 

the Types 66, 66Z, and 66ZZ self-operated pressure 

reducing regulators.  Some of the specifications for a 

given regulator as it comes from the factory appear on 

the regulator nameplate.

Principle of Operation

The cast iron Type 66 regulator uses a pitot tube to 

sense outlet pressure while the steel Type 66 regulator 

uses an external control line to sense outlet pressure 

as shown in Figure 6.  Both pressure-sensing methods 

register the outlet pressure under the main diaphragm.  

When increased downstream demand lowers the outlet 

pressure, the lower pressure under the main diaphragm 

causes the regulator main spring and valve plug and 

stem assembly to open the regulator seat ring and to 

supply more gas to the downstream system.

W1935-1

Figure 1. 

Type 66 Self-Operated Pressure 

Reducing Regulator

Summary of Contents for FISHER 66

Page 1: ... while satisfying the downstream flow demands The Types 66Z and 66ZZ self operated regulators Figures 8 and 9 also control a reduced outlet pressure however both have springs sensitive to negative pressures and can be used for vacuum regulation Each regulator type has a balancing diaphragm which increases accurate and sensitive response to pressure changes by reducing the unbalanced forces acting ...

Page 2: ...inal Body size inch DN END CONNECTION STYLES AND RATINGS 1 Standard Cast Iron Body Optional Steel Body Type 66 66Z 66ZZ or 66 vacuum regulators or breakers 2 50 NPT or CL125 FF NPT all types CL150 RF all types CL150 FF CL300 RF 3 4 80 100 CL125 FF CL150 RF Maximum Operating Pressure Recommended for Good Performance 66 Series Vacuum Regulators or Breakers Only Vacuum Regulators 10 psig or 20 4 inch...

Page 3: ...1 psig 0 07 bar minimum differential pressure required with this range 2 Heavy head construction required 3 Extra heavy head construction required construction outlet Control pressure range control spring information Inches w c Unless Otherwise Designated mbar 3 inch DN 80 Body Part Number Color Code Free Length Inches mm Wire Diameter Inches mm Type 66 4 to 11 1 8 to 28 1 10 to 27 1 20 to 70 1 1D...

Page 4: ...egulators or breakers 0 to 2 0 2 to 0 8 2 to 6 0 to 1 5 0 to 5 0 74 to 2 5 to 15 0 to 4 1J196727012 1E937227012 1K418127012 1J823827012 11 06 281 11 06 281 11 50 292 11 56 294 0 154 3 91 0 112 2 85 0 162 4 12 0 135 3 43 1 1 psig 0 07 bar minimum differential pressure required with this range 2 Heavy head construction required 3 Extra heavy head construction required Table 1C Outlet Control Pressur...

Page 5: ...des does not eliminate the possibility of damage from external sources or from debris in the line The regulator should be inspected for damage regularly and after any condition exceeding Specifications limits Complete downstream protection is needed with a Type 66 66Z or 66ZZ regulator if the actual inlet pressure can exceed the regulator outlet pressure rating or the pressure ratings of any downs...

Page 6: ...ner is not provided for the entire unit an optional filter may be installed on the optional external control line to help protect the pressure sensing parts Warning The Type 66 66Z or 66ZZ regulator upper diaphragm casing vent must remain clear and unobstructed A clogged vent may cause equipment damage or personal injury due to improper regulator functioning Install and maintain the regulator so t...

Page 7: ...s 66 66Z 66ZZ regulators monitor the outlet pressure with a gauge during adjustment Make sure there is flow through the regulator when checking outlet pressure setting Remove the closing cap key 27 Figures 6 7 8 and 9 and turn the adjusting screw key 25 Figures 6 7 8 and 9 clockwise or toward the spring case to increase the downstream reduced pressure Turn the adjusting screw counterclockwise or a...

Page 8: ...tors remove the closing cap key 27 and closing cap gasket key 26 Remove all compression in the spring key 6 by turning the adjusting screw key 25 out of the spring case For the Types 66 and 66Z regulators remove the adjusting screw key 25 the upper spring seat key 24 and the spring key 6 For the Type 66ZZ regulator Figure 9 tip the adjusting screw key 25 to one side so that it can be grasped and p...

Page 9: ... 16 inch 7 94 mm or smaller rod through the pipe plug and valve stem holes Use steps 5 through 7 of the Replacing Plug O Ring or Metal Seated Valve Plug section to secure the bottom flange key 7 3 Place the lower stem gasket key 18 on the valve plug stem key 13 4 Place one balancing diaphragm plate key 15 on the valve plug stem key 13 with cupped side facing the valve plug 5 Align the gasket key 3...

Page 10: ... key 2 using the marks made in the Disassembly section step 3 Place the upper diaphragm casing key 2 on the diaphragm fasten the cap screws and hex nuts keys 21 and 22 tightening the cap screws using an even crisscross pattern and put the spring key 6 on the spring seat in the spring case For the Type 66ZZ regulator hook the spring key 6 to the valve stem key 13 Align the upper diaphragm casing ke...

Page 11: ...ube 69 25 26 27 23 37 11 13 68 36 optional metal seat 32 5 4 33 2 17 13 18 51 16 22 20 19 1 9 23 37 8 34 3 21 28 29 30 10 11 15 35 14 7 CJ8392 F CK4805 D A2502 1 69 68 6 30 29 28 A DETAIL A SCALE 2 1 3 5 4 14 35 15 13 10 11 8 37 23 20 7 22 32 21 33 2 17 36 25 26 27 66 19 9 12 1 18 34 16 31 31 NOT SHOWN NOT SHOWN APPLY LUB APPLY LUB CD5300 ...

Page 12: ... 69 68 36 18 2 30 28 29 27 26 25 6 17 21 33 4 16 22 32 10 5 34 11 12 37 14 35 3 1 38 23 9 20 8 13 15 7 19 Figure 9 Type 66ZZ Regulator 30A6347 D 69 68 57 54 43 6 26 25 53 52 33 34 3 4 18 21 32 22 1 10 37 16 13 5 2 30 15 14 9 19 20 35 12 11 8 23 7 27 31 NOT SHOWN APPLY LUB ...

Page 13: ...3612012 Stainless steel 2 inch DN 50 body 1D783012022 3 inch DN 80 body 1D783112022 4 inch DN 100 body 1D783212022 Key Description Part Number 11 Seat Ring Standard Brass 2 inch DN 50 body 1D783012022 3 inch DN 80 body 1D783112022 4 inch DN 100 body 1D783212022 Stainless steel also NACE 2 inch DN 50 body 1D783033092 3 inch DN 80 body 1D783133092 4 inch DN 100 body 1D783233092 Metal to Metal Seats ...

Page 14: ... 50 Steel body 12 required 1C275224052 2 inch DN 50 Steel body NACE 12 required 1C2752X0032 3 inch DN 80 body 16 required 1D529824052 3 inch DN 80 body NACE 16 required 1D5298X0012 Key Description Part Number 20 Cap Screw Zinc plated steel continued 4 inch DN 100 body 16 required 1D530824052 4 inch DN 100 body NACE 16 required 1D5308X0022 21 Cap Screw Zinc plated steel 2 inch DN 50 body 16 require...

Page 15: ... inch DN 50 body 1N930114012 4 inch DN 100 body 1U965414012 49 Lower Travel Stop for Type 66 with external control line and adjusting travel stops Brass 2 inch DN 50 body 1N930214012 4 inch DN 100 body 1U965514012 Key Description Part Number 50 Lock Washer for Type 66 with external control line and adjusting travel stops Steel 2 required 2 inch DN 50 body 1A339828992 4 inch DN 100 body 1A343628992...

Page 16: ...rocess Management product remains solely with the purchaser Emerson Process Management Regulator Technologies Inc 1952 2008 All Rights Reserved Industrial Regulators Emerson Process Management Regulator Technologies Inc USA Headquarters McKinney Texas 75069 1872 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Shanghai China 201206 Tel 86 21 2892 9000 Europe Bologna Italy 40013 Tel 3...

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