66ZZ Emerson Fisher Pressure Reducing Regulators Instruction Manual
- June 10, 2024
- Emerson
Table of Contents
66ZZ Emerson Fisher 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.
Specifications
Body Sizes and End Connection Styles(1)
COnSTRuCTiOn
| ****
nOMinal 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 Allowable Inlet Pressures(1)
-
Emergency Inlet Pressure:
Type 66, 66Z, 66ZZ, or 66 Series Vacuum Breakers: 25 psig (1,72 bar) positive pressure 66 Series Vacuum Regulators: 8 psig or
16.3-inches of mercury (0,55 bar differential) vacuum -
Maximum Allowable Outlet Pressures(1) Type 66: 10 psig (0,69 bar)
Type 66Z: 5 psig (0,34 bar)
Type 66ZZ: 2 psig (0,14 bar)
66 Series Vacuum Regulators or Breakers:
No more than 1 psig (0,07 bar differential) change from spring setting -
Maximum Operating Inlet Pressure Recommended for Good Performance:
Type 66, 66Z, or 66 Series Vacuum Breakers:
5 psig (0,34 bar) positive pressure
Type 66ZZ: 2 psig (0,14 bar)
66 Series Vacuum Regulator: 6-inches w.c. or 0.4-inch of mercury (15 mbar differential) vacuum -
Maximum Allowable Outlet Pressures(1)
Emergency Outlet (Casing) Pressure:
Type 66, 66Z, or 66ZZ: 8 psig (0,55 bar) positive pressure
66 Series Vacuum Regulator: 14.7 psi or 29.9-inches of mercury (1,01 bar differential) vacuum
66 Series Vacuum Breakers: 8 psi or 16.3-inches of mercury (0,55 bar differential) vacuum Maximum Safe Pressure to Avoid Internal Parts Damage:
Type 66, 66Z, or 66ZZ: 1 psig (0,07 bar differential) above outlet pressure setting
66 Series Vacuum Regulator: No more than 1 psig (0,07 bar differential) change from spring setting
Elastomer Temperature Capabilities
Nitrile (NBR) Standard Elastomers: -40°to 180°F (-40°to 82°C)
Fluorocarbon (FKM) Elastomers:
0°to 350°F (-18°to 177°C)
Ethylenepropylene (EPDM) Elastomers:
-40°to 275°F (-40° to 135°C)
Pressure Registration
Type 66, 66Z, or 66ZZ
Cast Iron Body: Internal (standard) or external
Steel Body: External (standard) or internal 66 Series Vacuum Regulators or
Breakers: External
Control Line when Used: 3/4-inch NPT standard Bottom Flange Line when Used:
1/4-inch NPT standard with removable plug Spring Case Vent: 3/4-inch NPT
standard with removable Type Y602-10 vent assembly
Outlet (Control) Pressure Ranges
See Tables 1A through 1C
Control Line Connection
3/4-inch NPT
Flow and Sizing Coefficients
See Tables 2 and 3
Approximate Weights
2-inch (DN 50) Body
NPT: 50 pounds (22,7 kg)
Flanged: 55 pounds (25,0 kg)
3-Inch (DN 80) Flanged Body:
100 pounds (45,4 kg)
4-Inch (DN 100) Flanged Body:
155 pounds (70,3 kg)
Table 1A. Outlet (Control) Pressure Ranges, 2-inch (DN 50) Body
__
__
COnSTRuCTiOn
| O u T l ET ( CO n TRO l )
PRESSuRE RangE
| CO n TRO l SPRing inFORMaTiOn
---|---|---
inches w.c. unless Otherwise Designated| __
mbar
| 2-inch (Dn 50) Body
Part number| Color Code| Free l ength, inches (mm)|
Wire Diameter, inches (mm)
__
__
__
__
__
Type 66
| 4 to 11(1)
8 to 28(1)
| 10 to 27(1)
20 to 70(1)
| 0B019727052
1E611427022
| Purple None| 6.00 (152)
6.00 (152)
| 0.148 (3,76)
0.200 (5,08)
2 to 5
4 to 8
| 5 to 12
10 to 20
| 1D892527022
1D892627022
| Brown Red| 6.12 (155)
7.53 (191)
| 0.109 (2,77)
0.112 (2,85)
7 to 12
10 to 17
14 to 28
| 17 to 30
25 to 42
35 to 70
| 1D892727012
1D892827032
1D892927032
| Black Orange stripe
Unpainted
| 7.88 (200)
7.75 (197)
7.53 (191)
| 0.130 (3,30)
0.148 (3,76)
0.162 (4,12)
0.75 to 1.5 psig 1 to 2 psig
1.5 to 3 psig 3 to 5 psig
| 0,05 to 0,10 bar
0,07 to 0,14 bar
0,10 to 0,21 bar
0,21 to 0,34 bar
| 1D765727032(2)
1D765827032(2)
1D962627032(2)
1N506427142(3)
| __
Unpainted
| 6.09 (155)
6.00 (152)
6.25 (159)
6.31 (160)
| 0.207 (5,26)
0.225 (5,72)
0.262 (6,66)
0.283 (7,19)
Type 66Z| -1 to 2| -2 to 5| 1D892527022| Brown| 6.12 (155)| 0.109 (2,77)
Type 66ZZ| -0.25 to 0.25| -0,62 to 0,62| 1E991427012| __
__
Unpainted
| 5.62 (143)| 0.085 (2,16)
66 Series vacuum regulators
or breakers
| 0 to -2
-0.2 to -0.8
-2 to -6
| 0 to -5
-0,74 to -2
-5 to -15
| 1J196527012
1H387327012
1N152427012
| 5.62 (143)
5.62 (143)
5.62 (143)
| 0.102 (2,59)
0.095 (2,41)
0.112 (2,85)
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 1B. Outlet (Control) Pressure Ranges, 3-inch (DN 80) Body
__
__
COnSTRuCTiOn
| O u T l ET ( CO n TRO l )
PRESSuRE RangE
| CO n TRO l SPRing inFORMaTiOn
---|---|---
inches w.c. unless Otherwise Designated| __
mbar
| 3-inch (Dn 80) Body
Part number| Color Code| Free l ength, inches (mm)|
Wire Diameter, inches (mm)
| 4 to 11(1)| 10 to 27(1)| 1D479927032| | 6.00 (152)| 0.162 (4,12)
| 8 to 28(1)| 20 to 70(1)| 1D527327022| Unpainted| 6.00 (152)| 0.207 (5,26)
2 to 5| 5 to 12| 1D893027022| 6.12 (155)| 0.112 (2,85)
| 4 to 8| 10 to 20| 1D893127012| | 7.12 (181)| 0.125 (3,18)
__
Type 66
| 7 to 12
10 to 17
| 17 to 30
25 to 42
| 1D892827032
1D893227032
| Orange Stripes Gray with White Stripe| 7.75 (197)
7.50 (191)
| 0.148 (3,76)
0.156 (3,96)
| 14 to 28| 35 to 70| 1D893327032| Green| 7.25 (184)| 0.182 (4,62)
| 0.75 to 1.5 psig| 0,05 to 0,10 bar| 1D765827032(2)| | 6.00 (152)| 0.225
(5,72)
| 1 to 2 psig| 0,07 to 0,14 bar| 1D962627032(2)| | 6.25 (159)| 0.262 (6,66)
| 1.5 to 3 psig| 0,10 to 0,21 bar| 1E204427032(2)| | 6.38 (162)| 0.306 (7,77)
| 3 to 5 psig| 0,21 to 0,34 bar| 1N506527142(3)| | 6.38 (162)| 0.362 (9,20)
Type 66Z| -1 to 2| -2 to 5| 1D893027022| Unpainted| 6.12 (155)| 0.112 (2,85)
Type 66ZZ| -0.25 to 0.25| -0,62 to 0,62| 1E991527012| | 8.62 (219)| 0.100
(2,54)
66 Series vacuum regulators
or breakers
| 0 to -2
-2 to -6
| 0 to -5
-5 to -15
| 1J196627012
1K384427012
| | 5.62 (143)
5.62 (143)
| 0.114 (2,90)
0.120 (3,05)
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) Pressure Ranges, 4-inch (DN 100) Body
__
__
COnSTRuCTiOn
| O u T l ET ( CO n TRO l )
PRESSuRE RangE
| CO n TRO l SPRing inFORMaTiOn
---|---|---
inches w.c. unless Otherwise Designated| __
mbar
| 4-inch (Dn 100) Body
Part number| Color Code| Free l ength, inches (mm)|
Wire Diameter, inches (mm)
| 4 to 11(1)| 10 to 27(1)| 1D527527022| | 7.75 (197)| 0.170 (4,32)
| 8 to 28(1)| 20 to 70(1)| 1D527627032| Unpainted| 7.75 (197)| 0.225 (5,72)
2 to 5| 5 to 12| 1D892627022| 7.53 (191)| 0.112 (2,85)
| 4 to 8| 10 to 20| 1D893427022| | 7.75 (197)| 0.135 (3,43)
__
Type 66
| 7 to 12
10 to 17
| 17 to 30
25 to 42
| 1D893227032
1D893527032
| Gray Unpainted| 7.50 (191)
7.75 (197)
| 0.156 (3,96)
0.170 (4,32)
| 14 to 28| 35 to 70| 1D893627032| Unpainted| 7.81 (198)| 0.207 (5,26)
| 0.75 to 1.5 psig| 0,05 to 0,10 bar| 1D771227032(2)| Unpainted| 7.75 (197)|
0.262 (6,66)
| 1 to 2 psig| 0,07 to 0,14 bar| 1D771327032(2)| Unpainted| 7.75 (197)| 0.283
(7,19)
| 1.5 to 3 psig| 0,10 to 0,21 bar| 1E204527032(3)| Unpainted| 7.53 (191)|
0.331 (8,41)
| 3 to 5 psig| 0,21 to 0,34 bar| – – – –| – – – –| – – – –| – – – –
Type 66Z| -1 to 2| -2 to 5| 1D892627022| Red| 7.53 (191)| 0.112 (2,85)
Type 66ZZ| -0.25 to 0.25| -0,62 to 0,62| 1E937227012| | 11.06 (281)| 0.112
(2,85)
66 Series vacuum| 0 to -2
-0.2 to -0.8
| 0 to -5
-0,74 to -2
| 1J196727012
1E937227012
| __
Unpainted
| 11.06 (281)
11.06 (281)
| 0.154 (3,91)
0.112 (2,85)
regulators| -2 to -6| -5 to -15| 1K418127012| | 11.50 (292)| 0.162 (4,12)
or breakers| 0 to 1.5| 0 to 4| 1J823827012| | 11.56 (294)| 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 2. Flow Coefficients
O u T l ET PRESSuRE
RangE, PSig (bar)
| __
DROOP,
PSig (bar)
| REgulaTing C g| REgulaTing C v| WiDE-OPEn C g| WiDE-OPEn C v| __
C 1
---|---|---|---|---|---|---
2-inch (Dn 50)| 3-inch (Dn 80)| 4-inch (Dn100)|
2-inch (Dn 50)| 3-inch (Dn 80)| 4-inch (Dn100)|
2-inch (Dn 50)| 3-inch (Dn 80)| 4-inch (Dn100)|
2-inch (Dn 50)| 3-inch (Dn 80)| 4-inch (Dn100)
0.75 to 1.5| 0.2 (0,01)| 765| 1865| 3330| 21.9| 53.3| 95.1| | | | | | |
(0,05 to 0,10)| 0.3 (0,02)| 1150| 2800| 5000| 32.9| 80| 143| | | | | | |
1 to 2| 0.3 (0,02)| 825| 1650| 3150| 23.6| 47.1| 90| | | | | | |
(0,07 to 0,14)| 0.4 (0,03)| 1100| 2200| 4200| 31.4| 62.9| 120| | | | | | |
1.5 to 3| 0.4 (0,03)| 665| 1165| 2500| 19| 33.3| 71.4| 1260| 3400| 5250| 36|
97.1| 150| 35
(0,10 to 0,21)| 0.6 (0,04)| 1000| 1750| 3750| 28.6| 50| 107| | | | | | |
3 to 5
(0,21 to 0,34)
| 0.6 (0,04)
0.8 (0,06)
1.0 (0,07)
| 540
720
900
| 725
970
1210
| __
– – – –
| 15.4
20.6
25.7
| 20.7
27.7
34.6
| __
– – – –
| | | | | | |
Table 3. IEC Sizing Coefficients
| BODy SiZE, inCh (Dn) | X T | F D | F l |
|---|---|---|---|
| 2 (50) | __ |
0.775
| 0.35| __
0.89
3 (80)| 0.34
4 (100)| 0.30
When decreased downstream demand raises the outlet pressure, the higher pressure under the main diaphragm opposes the regulator main spring causing the valve plug and stem assembly to close the regulator seat ring and to supply less gas to the downstream system.
The Types 66Z and 66ZZ regulators are identical to the Type 66 regulator in operation but different in construction. The Type 66Z regulator (Figure 8) has a counter spring under the valve plug and disk assembly which counters the main spring force to allow settings below atmospheric pressures. The Type 66ZZ regulator (Figure 9) has a longer spring case where the main spring, a low rate tension spring, is stretched between the adjusting screw and the valve plug stem, also providing below atmospheric settings and more sensitive pressure regulation than the Types 66 and 66Z regulators.
Installation
Warning
Exposure of the regulator to physical damage and to corrosive material can
cause improper operation or release of pressure. Either condition may result
in equipment damage or personal injury. Properly install the regulator in a
safe location.
caution
Use of this regulator where service conditions can exceed Specifications
limits may cause equipment damage or injury to personnel. Be sure the
regulator service conditions do not exceed Specifications limits.
Regulator operation within Specifications limits and applicable codes 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 downstream equipment. Provide
adequate overpressure protection for the regulator and any downstream
equipment.
Make sure that there is no damage to or foreign material in the regulator and that all tubing and piping is clean and unobstructed. Install the regulator so that flow through it matches the arrow marked on the regulator body. Some typical 66 Series regulator installations are shown in Figures 2, 3, and 4.
Install the Types 66, 66Z, and 66ZZ regulators horizontally with the spring
case vertically above the valve body. Other orientations change the regulator
set point and controlled pressure range due to the weight of the internal
parts.
If threaded connections are used, apply a good grade of pipe compound to only
the male pipeline threads.
If flanged connections are used, use good bolting practices and suitable
gaskets.
If continuous operation of the system is required during inspection and
maintenance, install a threevalve bypass around the regulator. If an upstream
strainer 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 that dust, insects, and weather conditions do not clog or
obstruct the vent.
The vented gas must not be allowed to accumulate where it can cause a
hazardous condition. In pit, underground, or indoor installations,vented gas
can become an explosion, fire, or toxic hazard. Provide piping to remotely
vent the gas to a safe area away from buildings, air intakes, or any hazardous
location. The line or stack opening must be protected against condensation,
freezing, or any clogging substance.
If a remote vent is needed, remove the upper diaphragm casing vent and connect
3/4-inch threaded NPT piping to the upper diaphragm casing. The piping should
be as short as possible, have as few bends as possible, must vent the gas to a
safe location, and should have a screened vent on the exhaust end.
With steel bodies, an external control line is required.
Connect 3/4-inch threaded NPT control line to the lower diaphragm casing
connection from the point where the downstream pressure is to be sensed. A
needle valve should be installed in the control line for isolating the
regulator and for damping out control line pulses.
The regulator set pressure is adjusted at the factory for the reduced pressure
specified on the order. If no pressure is specified, the regulator is set for
a pressure approximately in the middle of the main spring pressure range.
Check the spring setting to make sure it is correct for the application.
Startup
caution
If the regulator is in a system already pressurized (either positive or
negative pressure), use care when placing the Type 66, 66Z, or 66ZZ regulator
in service. Use pressure gauges to monitor upstream, control line, if one is
used, and downstream pressure. If the limits in Specifications are exceeded
during start-up, damage to the regulator may result.
With proper installation completed and downstream equipment properly adjusted,
slowly open the upstream and downstream block valves while using pressure
gauges to monitor pressure. Regulator outlet pressure may be monitored on a
gauge installed at some point downstream from the regulator.
If outlet pressure adjustment is necessary for Types 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
away from, the spring case to decrease the downstream reduced pressure.
For vacuum service, turning the adjusting screw toward the spring case
decreases the vacuum downstream. Turning the adjusting screw away from the
spring case increases the vacuum downstream.
Shutdown
To remove the Type 66, 66Z, or 66ZZ regulator from positive pressure service,
first close the upstream and then the downstream block valve. Close the needle
valve in the external control line, if one is used, and vent the regulator
body and lower diaphragm casing to release any trapped pressure.
To remove the Types 66Z and 66ZZ regulators from negative pressure service,
close the upstream and downstream block valves. If a control line is
used,close the control line needle valve. Vent the regulator body and lower
diaphragm casing.
Maintenance
Regulator parts are subject to normal wear and must be inspected and replaced
as necessary. Inspection and maintenance frequency depends upon the severity
of service conditions.
Warning
To avoid personal injury or equipment damage from the sudden release of
pressure, isolate the reducing regulator from the pressure system and release
all pressure from the regulator before performing maintenance operations.
Maintenance steps are in two general sections.
Replacing the Valve Plug O-Ring or the Metal-Seated Valve Plug is the first
section. Replacing the Main Spring, the Main and Balancing Diaphragms, and the
Seat Ring is the second section. Complete the necessary maintenance steps in
the appropriate section, inspecting and replacing parts as required.
These maintenance procedures refer to all three regulator types unless
otherwise indicated.
All key numbers refer to Figures 6, 7, 8, and 9 unless otherwise indicated.
Replacing Plug O-Ring or Metal Seated Valve Plug
-
Remove hex screws (key 20) from the bottom flange (key 7).
-
Remove the bottom flange and bottom flange gasket (key 19). With the Type 66Z regulator, the counter spring (key 38) will fall out when the bottom flange is removed.
-
Remove the pipe plug from the side of the valve body. To keep the valve stem (key 13) from rotating, insert a 5/16-inch (7,94 mm) or smaller rod into the pipe plug hole and through the hole in the valve stem.
-
For all regulators with a valve plug O-ring, remove the stop nut (key 23), the disk retainer (key 9), the plug skirt (key 10), the sealing washer (key 37), and the plug O-ring (key 8). For the Type 66Z regulator, also remove the lower spring seat (key 17).
For a Type 66 metal-seated regulator, remove the stop nut (key 23) and the plug skirt (key 10). -
For all regulators with a valve plug O-ring, place the sealing washer, the plug skirt, the O-ring, and the disk retainer on the plug stem in the order shown in Figures 6, 7, 8 and 9. For the
Type 66Z regulator, also place the counter spring seat on the plug stem.
For a Type 66 metal-seated regulator, place the plug skirt (key 10) on the plug stem (key 13). -
Secure the stop nut (key 23) to the plug stem.
-
For the Type 66Z regulator, place the counter spring (key 38) against the lower spring seat (key 17).
-
Install the bottom flange gasket (key 19) and the bottom flange (key 7) on the valve body. Secure the flange with the cap screws (key 20).
-
Remove the 5/16-inch (7,94 mm) or smaller rod rod and replace the pipe plug (key 31) in the valve body.
Replacing Main Spring, Main and
Balancing Diaphragms, and Seat Ring
Disassembly
- For all regulators, 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 pull it, the spring retainer (key 43), and the ten ball bearings (key 54) out of the spring case. Unhook the spring (key 6) and leave the spring retainer (key 43) and the ten ball bearings (key
- in the adjusting screw (key 25).
Note
If a spring change is the only maintenance required for the Type 66 or 66Z regulator, proceed to steps 16 through 19 in the Assembly section. For further disassembly, proceed to step 2.
-
Unscrew the diaphragm casing hex nuts (key 22) and remove the cap screws (key 21).
-
If a special spring case orientation is required for remote venting, mark the side of the diaphragm casing flanges to aid in assembly.
Remove the upper diaphragm casing (key 2).
For the Type 66ZZ regulator, unhook the spring (key 6) from the plug stem (key 13).
Note
If the spring change is the only maintenance required for the Type 66ZZ regulator, proceed to steps 16 through 19 in the Assembly section. For further disassembly, proceed to step 4. -
Remove the valve body pipe plug from the side of the body. To keep the valve plug from twisting, insert a 5/16-inch (7,94 mm) or smaller rod through the pipe plug hole and the hold in the plug stem (key 13).
-
Remove the upper stop nut (key 23), washer (key 36, except for the Type 66ZZ regulator),the lower spring seat (key 17, except for the Type 66ZZ regulator), and the upper diaphragm plate (key 4).
-
Remove and inspect the main diaphragm (key 5).
If no further maintenance is needed, refer to steps 13 through 19 in the Assembly section for instructions. Continue to step 7 if further disassembly is required. -
Remove the lower diaphragm plate (key 4), the top stem gasket (key 18), the diaphragm spacer (key 16), the middle stem gasket (key 18), and the upper balancing diaphragm plate (key 15).
-
To aid in assembly, record the position of the lower diaphragm casing with respect to the valve body. Unscrew and remove the cap screws (key 20) and washers (key 34) that hold the lower diaphragm casing to the valve body (key 1).
Remove the lower diaphragm casing (key 3). -
Remove and inspect the balancing diaphragm (key 14) and the gasket (key 35).
If no further maintenance is required, proceed to steps 5 through 19 in the Assembly section.
For further disassembly, proceed with step 10. -
Remove the lower balancing diaphragm plate (key 15) and the lower stem gasket (key 18).
-
Remove the 5/16-inch (7,94 mm) or smaller rod from the valve body pipe plug hole so that the valve plug and stem assembly can be moved.
Slide a seat ring puller, T-wrench, or other suitable tool over the valve plug stem. Engage the tool with the seat ring lugs. If a suitable tool will not fit over the valve plug stem, remove the valve body bottom flange (key 7) using steps 1 and 2 of the Replacing Plug O-Ring or Metal Seated Valve Plug section and remove the valve plug and stem assembly. Unscrew the seat ring (key 11).
Assembly
-
Apply a good grade of piping compound to the seat ring (key 11) threads. Thread in the seat ring using the seat ring puller or a similar device. Wipe off any excess piping compound.
-
If the valve plug and stem assembly was not removed, proceed to step 3.
If the valve plug and stem assembly was removed, place the assembly in the valve body and insert the 5/16-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). -
Place the lower stem gasket (key 18) on the valve plug stem (key 13).
-
Place one balancing diaphragm plate (key 15) on the valve plug stem (key 13) with “cupped” side facing the valve plug.
-
Align the gasket (key 35) holes with the valve body pitot tube and cap screw holes and place the gasket on the valve body.
-
Align the balancing diaphragm (key 14), pitot tube (key 12), and cap screw holes with the holes in the valve body and place the balancing diaphragm on top of the gasket (key 35).
-
Align the lower diaphragm casing (key 3) using the position recorded in the Disassembly section step 8 so that the pitot tube (key 12) will be open.
Secure the casing (key 3) with the washers (key 34) and cap screws (key 20), tightening the cap screws using an even, crisscross pattern. -
Place the balancing diaphragm plate (key 15) on the balancing diaphragm so that the “cupped” side of the plate faces the main diaphragm (key 5).
-
Place the middle stem gasket (key 18) on top of the balancing diaphragm plate.
-
Slide the diaphragm spacer (key 16) onto the valve plug stem.
-
Place the upper stem gasket (key 18) on the valve plug stem.
-
Position a diaphragm plate (key 4) so that its “cupped” side faces the balancing diaphragm.
-
Align the main diaphragm cap screw holes with the diaphragm casing cap screw holes and place the diaphragm (key 5) on the diaphragm plate (key 4).
-
Place another diaphragm plate (key 4) on the main diaphragm (key 5) so that the plate “cupped” side faces the main spring (key 6).
-
For the Types 66 and 66Z regulators, place the lower spring seat (key 17) and the washer (key 36) on the valve plug stem. Secure these parts with the stop nut (key 23).
For the Type 66ZZ regulator, screw on a stop nut (key 23) to secure the diaphragm plates (key 4). -
For the Types 66 and 66Z regulators, align the upper diaphragm casing (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 (key 2) using the marks made in the Disassembly section step 3, put the spring (key 6) in the spring case while placing the upper diaphragm casing (key 2) on the diaphragm. Fasten the cap screws and hex nuts (keys 21 and 22) together tightening them using an even, crisscross pattern. -
For the Types 66 and 66Z regulators, place the upper spring seat (key 24) on the spring (key 6).
For the Type 66ZZ regulator, apply an appropriate lubricant to the ball bearings, pull the spring out of the spring case using a stiff wire hook or similar tool. Holding the adjusting screw (key 25), spring retainer (key 43), and ten ball bearings (key 54) together, hook the spring (key 6) into the spring retainer (key 43). -
Thread the adjusting screw (key 25) into the spring case. Apply a good grade of piping compound to the adjusting screw threads, remove the rod and thread the pipe plug (key 31) into the body, and adjust the regulator following the steps in the Start-Up section.
-
Thread the closing cap (key 27) onto the spring case.
Parts Ordering
The Types 66, 66Z, and 66ZZ regulators have a serial number stamped on a nameplate attached to the upper diaphragm casing. When corresponding with your local Sales Office, always refer to this serial number of each needed part as found in the following parts list.
Parts List
Note
In this parts list, parts marked NACE are intended for corrosion-resistant
service as detailed in the NACE International standards MR0175/ISO 15156
and/or MR0103.
Parts Kits
Included are keys 5, 8, 14, 18, 19, 26, and 35
- 2-inch (DN 50) body R66X0000022
- 3-inch (DN 80) body R66X0000032
- 4-inch (DN 100) body R66X0000042
Key Description Part Number
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: +39 051 4190611
Middle East and Africa
Dubai, United Arab Emirates
Tel: +971 4811 8100
Natural Gas Technologies
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
Singapore, Singapore 128461
Tel: +65 6777 8211
Europe
Bologna, Italy 40013
Tel: +39 051 4190611
Gallardon, France 28320
Tel: +33 (0)2 37 33 47 00
TESCOM
Emerson Process Management
Tescom Corporation
USA – Headquarters
Elk River, Minnesota 55330-2445 USA
Tel: 1-763-241-3238
Europe
Selmsdorf, Germany 23923
Tel: +49 (0) 38823 31 0
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 specifications 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.
©Emerson Process Management Regulator Technologies, Inc., 1952, 2008; All Rights Reserved
Download PDF: 66ZZ Emerson Fisher Pressure Reducing Regulators Instruction Manual