Y610A, Y611A, and Y612A Series Vacuum
Service Equipment and Relief Valves
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
valves must be installed, operated
and maintained in accordance with
federal, state, and local codes, rules
and regulations, and Emerson Process
Management Regulator Technologies,
Inc. instructions.
If a leak develops or if the outlet
continually vents gas, service to the
unit may be required. Failure to correct
trouble could result in a hazardous
condition. Only a qualied person must
install or service the unit.
vacuum breakers or relief
W1094_1
Figure 1. Type Y610A Vacuum Breaker
Introduction
Scope of the Manual
This manual describes and provides instructions and
parts lists for Y610A, Y611A, and Y612A Series
vacuum service equipment and relief valves.
Instructions and parts lists for other equipment used
with these regulators are found in separate manuals.
Product Description
The Y610A, Y611A, and Y612A Series devices are
used in a wide variety of vacuum and relief service
applications. The Y610A Series devices (Figure 1)
are used as vacuum breakers, the Y611A Series
devices are used as either vacuum breakers or relief
valves, and the Y612A Series devices are used as
vacuum regulators, and are described as follows:
www.fisherregulators.com
Type Y610A—Direct-operated vacuum breaker
with upward pointing 1 NPT vent connection, and
internal registration requiring no downstream
control line.
Type Y610AP—Same as Type Y610A except with
blocked throat, diaphragm case assembly tapped
1/2 NPT for control line connection, and O-ring
stem seal.
Type Y611A—Direct-operated relief valve with
upward pointing 1 NPT vent connection, and internal
registration requiring no downstream control line.
Type Y611AP—Direct-operated vacuum breaker with
blocked throat, 1 NPT screened side vent, diaphragm
case assembly tapped 1/2 NPT for control line
connection, and O-ring stem seal.
D103116X012
Page 2
Y610A, Y611A, and Y612A Series
Specications
The Specications section gives some general Y610A, Y611A, and Y612A Series ratings and other
specications. Individual regulator data as it comes from the factory is stamped either on the closing cap or
on a nameplate (Figure 2).
Body Sizes (Inlet x Outlet) and End
Connection Style
(2)
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP: 1-1/2 or 2 NPT,
or NPS 2 / DN 50 CL125 FF or
CL250 RF anged
Pressure Information
(1)
Type Y610A or Y610AP Vacuum Breaker:
See Table 1
Type Y611A or Y611AP Relief Valve:
See Table 2
Type Y612A or Y612AP Vacuum Regulator:
See Table 3
1. The pressure/temperature limits in this Instruction Manual and any applicable standard limitation should not be exceeded.
2. DIN (or other) end connections threaded to various national or international thread standards can usually be supplied; consult your local Sales Ofce.
Temperature Capabilities
-20 to 150°F / -29 to 66°C
Pressure Registration
Type Y610A, Y611A, or Y612A: Internal
Type Y610AP, Y611AP, or Y612AP: External
Approximate Weights
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP
With 1-1/2 NPT Body:
25 pounds / 11 kg
With NPS 2 / DN 50 Body:
30 pounds / 14 kg
(1)
Type Y612A—Direct-operated vacuum regulator with
upward pointing 1 NPT vent connection, and internal
registration requiring no downstream control line.
Type Y612AP—Same as Type Y612A except with
blocked throat, diaphragm case assembly tapped
1/2 NPT for control line connection, and O-ring
stem seal.
Installation
WARNING
!
Personal injury, property damage,
equipment damage, or leakage due to
escaping gas or bursting of pressurecontaining parts may result if this
equipment is overpressured or is
installed where service conditions could
exceed the limits given in Tables 1
through 3, or where conditions exceed
any ratings of the adjacent piping or
piping connections. To avoid such
injury or damage, provide pressurerelieving or pressure-limiting devices
(as required by the appropriate code,
regulation, or standard) to prevent
service conditions from exceeding
those limits.
2
11A5497_J
Figure 2. Nameplate
Additionally, physical damage to this
equipment could cause personal injury
or property damage due to escaping
gas. To avoid such injury or damage,
install the equipment in a safe and well
ventilated location.
Equipment operation within ratings does not
preclude the possibility of damage from debris in
the lines or from external sources. This equipment
should be inspected for damage periodically and
after any overpressure condition.
Page 3
MAXIMUM
ALLOWABLE
TYPES
Y610A and
Y610AP
TYPES
Y611A and
Y611AP
1. Including buildup.
INLET (BODY)
PRESSURE
psigbarpsigbar
130.90151.0
Table 1. Types Y610A and Y610AP Vacuum Breaker Pressure Information
MAXIMUM
EMERGENCY
OUTLET
(CASING)
PRESSURE
(POSITIVE)
Table 2. Types Y611A and Y611AP Relief Valve Pressure Information
MAXIMUM
MAXIMUM
ALLOWABLE
INLET (CASING)
PRESSURE
psigbarpsigbar
151.0
(1)
OPERATING
INLET (RELIEF)
PRESSURE TO
PREVENT PART
DAMAGE
5.10.35
5.20.36
5.30.37
5.50.38
60.41
6.50.45
7.50.52
SET PRESSURE
RANGE (VACUUM)
With Spring Case
Above Diaphragm
1 to 3 inches w.c. /
2 to 7 mbar
1.5 to 5 inches w.c. /
4 to 12 mbar
3 to 8 inches w.c. /
7 to 20 mbar
8 to 16 inches w.c. /
20 to 40 mbar
16 to 32 inches w.c. /
40 to 80 mbar
0.25 to 3 psig /
17 to 207 mbar
(1)
With Spring Case
Above Diaphragm
3 to 4 inches w.c. /
7 to 10 mbar
3.75 to 6 inches w.c. /
9 to 15 mbar
5 to 8 inches w.c. /
12 to 20 mbar
7 to 16 inches w.c. /
17 to 40 mbar
10 to 30 inches w.c. /
25 to 75 mbar
0.75 to 1.5 psig /
52 to 103 mbar
1 to 2.5 psig /
69 to 172 mbar
Y610A, Y611A, and Y612A Series
CHANGE IN OUTLET
(CONTROLLED)
PRESSURE
REQUIRED TO
FULLY OPEN
VACUUM BREAKER
0.0433
0.0785
0.1431
0.18112
0.37826
1.944134
BUILDUP OVER INLET
PRESSURE REQUIRED
TO FULLY OPEN
RELIEF VALVE
psigmbar
0.0896
0.1007
0.1249
0.21615
0.35124
0.64845
1.02671
With Spring Case
Below Diaphragm
0 to 2 inches w.c. /
0 to 5 mbar
0.50 to 4 inches w.c. /
1 to 10 mbar
2 to 7 inches w.c. /
5 to 17 mbar
7 to 15 inches w.c. /
17 to 37 mbar
15 to 31 inches w.c. /
37 to 77 mbar
0.25 to 3 psig /
17 to 207 mbar
INLET RELIEF
SET PRESSURE RANGE,
With Spring Case
Below Diaphragm
2 to 3 inches w.c. /
5 to 7 mbar
2.75 to 5 inches w.c. /
6.9 to 12 mbar
4 to 7 inches w.c. /
10 to 17 mbar
6 to 15 inches w.c. /
15 to 37 mbar
9 to 29 inches w.c. /
22 to 72 mbar
0.75 to 1.5 psig /
52 to 103 mbar
1 to 2.5 psig /
69 to 172 mbar
MAXIMUM
ALLOWABLE
VACUUM
psigbarpsigmbar
5.10.35
5.20.36
5.30.37
5.60.39
6.10.42
8.00.55
CONTROL
SPRING
COLOR CODE,
PART NUMBER
Brown Stripe,
1D892527022
Pink Stripe,
1D765427012
Purple Stripe,
0B019727052
Gray,
1B766627062
Unpainted,
1B883327022
Black,
1A630627022
CONTROL
SPRING
COLOR CODE,
PART NUMBER
Red,
1D892627022
Red,
1D892727012
Black,
1D892727012
White Stripe,
1D893227032
Green,
1D893327032
Blue,
1H975827032
Orange,
1H975927032
Note
If this equipment is shipped mounted on
another unit, install that unit according
to the appropriate instruction manual.
1. Only personnel qualied through training
and experience should install, operate, and
maintain this equipment. For Y610A, Y611A,
or Y612A Series equipment that is shipped
separately, make sure that there is no damage to
or foreign material in it. Also ensure that all tubing
and piping have been blown free.
2. This equipment may be installed in any position
as long as the ow through the body is in the
direction indicated by the arrow cast on thebody.
If continuous operation is required during
inspection or maintenance, install a three-valve
bypass around the equipment.
WARNING
!
This equipment may vent some gas
to the atmosphere. In hazardous or
ammable gas service, vented gas
may accumulate and cause personal
3
Page 4
Y610A, Y611A, and Y612A Series
Table 3. Types Y612A and Y612AP Vacuum Regulator Pressure Information
MAXIMUM
ALLOWABLE
INLET
(CASING)
PRESSURE
psigbarpsigbar
151.03
MAXIMUM
OPERATING
INLET
PRESSURE
TO PREVENT
PART
DAMAGE
5.10.35
5.20.36
5.30.37
5.60.39
6.10.42
8.00.55
SET PRESSURE
RANGE (VACUUM)
With Spring Case
Above Diaphragm
1 to 3 inches w.c. /
2.5 to 7 mbar
1.5 to 5 inches w.c. /
4 to 12 mbar
3 to 8 inches w.c. /
7 to 20 mbar
8 to 16 inches w.c. /
20 to 40 mbar
16 to 32 inches w.c. /
40 to 80 mbar
0.25 to 3 psig /
17 to 207 mbar
With Spring Case
Below Diaphragm
0 to 2 inches w.c. /
0 to 5 mbar
0.50 to 4 inches w.c. /
1.2 to 10 mbar
2 to 7 inches w.c. /
5 to 17 mbar
7 to 15 inches w.c. /
17 to 37 mbar
15 to 31 inches w.c. /
37 to 77 mbar
0.25 to 3 psig /
17 to 207 mbar
MAXIMUM
ALLOWABLE
VACUUM
psig barpsigmbarpsigmbarpsigmbar
5.10.35
5.20.36
5.30.37
5.60.39
6.10.42
8.00.55
CONTROL
SPRING
COLOR
CODE,
PART
NUMBER
Brown Stripe,
1D892527022
Pink Stripe,
1D765427012
Purple Stripe,
0B019727052
Gray,
1B766627062
Unpainted,
1B883327022
Black,
1A630627022
CHANGE IN OUTLET (CONTROLLED)
PRESSURE REQUIRED TO FULLY OPEN
VACUUM REGULATOR
5/8-inch /
16 mm
Port Diameter
0.0896.10.0533.60.0765.2
0.1248.60.0745.10.1067.3
0.189130.1127.70.16111
0.227160.1349.30.19313
0.405280.240170.34524
1.9441341.152791.65611 4
1-inch /
25 mm
Port Diameter
1-3/16-inch /
30 mm
Port Diameter
injury, death, or property damage due
to re or explosion. Vent equipment 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. A Type Y610A or Y610AP vacuum breaker
(Figure 3) is used in applications where an
increase in vacuum must be limited. An
increase in vacuum (decrease in absolute
pressure) is transmitted to the lower side of the
diaphragm, opening the disk assembly. This
permits atmosphere, or an upstream vacuum
that has higher absolute pressure than the
downstream vacuum, to enter the system and
restore the controlled vacuum to its original
pressure setting. A Type Y610A direct-operated
vacuum breaker is self-contained and requires
no control line. A Type Y610AP vacuum breaker
requires a control line from the 1/2 NPT tapping
in the diaphragm case assembly (key 20,
Figure 4) to a point downstream of the body
(key 28, Figure 4).
4. A Type Y611AP vacuum breaker (Figure 3) also
is used in applications where an increase in
vacuum must be limited. An increase in vacuum
(decrease in absolute pressure) is transmitted
to the upper side of the diaphragm, opening the
disk assembly. This permits atmosphere, or
an upstream vacuum that has higher absolute
pressure than the downstream vacuum, to enter
the system and restore the controlled vacuum
to its original pressure setting. A Type Y611AP
vacuum breaker requires a control line from the
1/2 NPT tapping in the spring case assembly
(key 23, Figure 5) to a point downstream of the
body (key 28, Figure 5).
5. A Type Y611A relief valve (Figure 3) is used to
maintain a constant inlet pressure with the outlet
owing to atmosphere or to any system whose
pressure is lower than the pressure at the relief
valve inlet. An increase in inlet pressure opens
the disk assembly, relieving the excess pressure
and restoring the inlet pressure to its original
setting. A Type Y611A direct-operated relief valve
is self-contained and requires no control line.
6. A Type Y612A or Y612AP vacuum regulator
is used to maintain a constant vacuum at the
regulator inlet. A decrease in this vacuum
(increase in absolute pressure) beyond this value
registers underneath the diaphragm and opens the
disk. This permits a downstream vacuum of lower
absolute pressure than the upstream vacuum
to restore the upstream vacuum to its original
pressure setting. A Type Y612A (Figure 6)
direct-operated vacuum regulator is self-contained
and requires no control line. A Type Y612AP
vacuum regulator requires a control line from the
1/2 NPT tapping in the diaphragm case assembly
to a point upstream of the body.
4
Page 5
Y610A, Y611A, and Y612A Series
Startup and Adjustment
All Y610A, Y611A, or Y612A Series equipment can
be placed in operation by slowly introducing inlet
vacuum or pressure. This equipment takes control
when downstream vacuum or pressure is established.
This equipment is suitable for the pressure range
stamped on the nameplate (key 48, Figure 4, 5, or 6),
and listed in Tables 1 through 3. To adjust the
pressure setting, remove the closing cap (key 3,
Figure 4, 5, or 6), the adjusting screw clockwise to
increase the pressure setting or counterclockwise to
decrease the setting. Replace the cap after making
this adjustment. If desired, the closing cap may
be wired to the hole provided in the spring case to
discourage tampering.
Shutdown
First close the nearest upstream shut-off valve and
then close the nearest downstream shut-off valve to
vent the equipment properly. Next, open the vent
valve between the equipment and the downstream
shut-off valve nearest to it. All pressure between
these shut-off valves is released through the open
vent valve.
Maintenance
Equipment parts are subject to normal wear and
must be inspected and replaced as necessary. The
frequency of inspection and replacement of parts
depends on the severity of service conditions and
upon applicable codes and government regulations.
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 equipment.
Body Area
These procedures are for gaining access to the disk
assembly, seat ring, and body gasket or diaphragm
case O-ring. All pressure must be released from
the diaphragm case before the following steps can
be performed.
Type Y610A or Y610AP Vacuum Breaker
Key numbers are referenced in Figure 4.
1. To inspect or replace the seat O-ring (key 39) or
seat ring (key 27), loosen the diaphragm case
cap screws (key 29), remove the union ring
(key 20D), and separate the diaphragm case
assembly (key 20) from the body (key 28).
2. Remove the diaphragm case O-ring (key 15) and
inspect the body (key 28).
3. Inspect and replace the seat ring (key 27)
if necessary. Lubricate the threads of the
replacement seat ring with a good grade of pipe
sealant and tighten using 29 to 37 foot-pounds /
39 to 50 N•m of torque.
4. If it is necessary to replace the seat O-ring (key 39),
remove the disk assembly cap screw (key 44), seal
washer (key 45), seat O-ring washer (key 32), and
seat O-ring from the valve stem (key 13).
5. Install the seat O-ring (key 39), seat O-ring washer
(key 32), and seal washer (key 45) onto the seat
O-ring holder (key 31), and secure with the disk
assembly cap screw (key 44).
6. If necessary, install a replacement diaphragm
case O-ring (key 15) into the body (key 28).
7. Install the diaphragm case assembly (key 20)
on the body (key 28) and secure with the union
ring (key 20D) and diaphragm case cap screws
(key 29).
Type Y611A or Y611AP Vacuum Breaker
or Relief Valve or Type Y612A or Y612AP
Vacuum Regulator
Types Y611A and Y611AP key numbers are
referenced in Figure 5 and Types Y612A and Y612AP
key numbers are referenced in Figure 6.
1. To inspect and replace the disk assembly (key 25),
remove the body cap (key 38).
2. Unscrew the disk spacer (key 43) and remove
the disk assembly (key 25), disk assembly gasket
(key 26), and disk spring (key 41) from the valve
stem (key 40).
3. To inspect and replace the seat ring (key 27),
loosen the diaphragm case cap screws (key 29),
remove the union ring (key 20D), and separate the
diaphragm case assembly (key 20) from the body
(key 28).
4. Remove the diaphragm case O-ring (key 15) and
inspect the body (key 28).
5
Page 6
Y610A, Y611A, and Y612A Series
VACUUM
BEING
LIMITED
VACUUM
PUMP
ATMOSPHERE
ONLY
POSITIVE PRESSURE OR ATMOSPHERE,
OR A LESSER VACUUM THAN THE
VACUUM BEING LIMITED
AJ7856_A
A2991_2
Y610A SERIES VACUUM BREAKER
INLET PRESSURE
P
1
BEING CONTROLLED
OR PROTECTED
Y610A SERIES
VACUUM BREAKER
VACUUM
AJ7853_A
A2992_2
Y612A SERIES
VACUUM REGULATOR
BEING
LIMITED
Y611A SERIES VACUUM BREAKER
UNAVOIDABLE
LEAKAGE
Y611A SERIES
VACUUM BREAKER
VACUUM
PUMP
VACUUM
BEING
CONTROLLED
AJ7854_A
A2993_2
6
P
2
ATMOSPHERE OR ANY PRESSURE
LESS THAN P
1
Y611A SERIES RELIEF VALVE
Y611A SERIES
RELIEF VALVE
AJ7865_A
A2994_2
Figure 3. Installation Schematics
HIGHER VACUUM SOURCE
VACUUM PUMP
Y612A SERIES VACUUM REGULATOR
Page 7
Y610A, Y611A, and Y612A Series
5. Inspect and replace the seat ring (key 27)
if necessary. Lubricate the threads of the
replacement seat ring with a good grade of pipe
sealant and tighten using 29 to 37 foot-pounds /
39 to 50 N•m of torque.
6. If necessary, install a replacement diaphragm
case O-ring (key 15) into the body (key 28).
7. Install the diaphragm case assembly (key 20)
on the body (key 28) and secure with the union
ring (key 20D) and diaphragm case cap screws
(key 29).
8. Install the disk spring (key 41), disk assembly
gasket (key 26), and disk assembly (key 25) on
the disk stem (key 40) and attach using the disk
spacer (key 43).
9. Use a good quality thread sealer when replacing
the body cap (key 38) assembly.
Diaphragm and Spring Case Area
These procedures are for gaining access to the
control spring, diaphragm assembly, valve stem, and
stem O-ring. All pressure must be released from the
diaphragm case before these steps can be performed.
Type Y610A or Y610AP Vacuum Breaker
Key numbers are referenced in Figure 4.
1. Remove the closing cap (key 3) and turn the
adjusting nut (key 18) counterclockwise until all
compression is removed from the control spring
(key 1).
2. Remove the spring case cap screws (key 21)
and hex nuts (key 22) and lift off the spring case
assembly (key 23). If the only further maintenance is
to change the control spring (key 1), skip to step 10.
3. Remove the diaphragm (key 5) and attached
parts by tilting it so that the pusher post (key 8)
slips off the lever assembly (key 9). To separate
the diaphragm (key 5) from the attached parts,
unscrew the diaphragm nut (key 37). If the only
further maintenance is to replace the diaphragm
parts or change the control spring (key 1), skip to
step 8.
4. To replace the lever assembly (key 9), remove the
machine screws (key 11) and lever pin (key 10).
5. To replace the valve stem (key 13) or stem seal
O-ring (key 46) perform Type Y610A or Y610AP
body area maintenance procedure step 4 and pull
the valve stem out of the stem adaptor (key 60).
6. Grease the replacement stem seal O-ring (key 46)
with a good grade of elastomer lubricant and
install on the valve stem (key 13). Install the valve
stem by pushing it into the stem adaptor (key 60)
and perform Type Y610A or Y610AP body area
maintenance procedure steps 5 and 6 if necessary.
7. Install the lever assembly (key 9) into the valve
stem (key 13) and secure the lever assembly
(key 9) with the lever pin (key 10) and machine
screws (key 11).
8. Install the small diaphragm plate gasket (key 7),
diaphragm plate (key 24), and diaphragm (key 5)
on the pusher post (key 8) and attach with the
diaphragm nut (key 37). Tighten using 30 to
45 foot-pounds / 41 to 61 N•m of torque.
9. Install the pusher post (key 8) plus attached
diaphragm parts onto the lever assembly (key 9).
10. Install the spring case assembly (key 23) and
control spring (key 1) on the diaphragm case
assembly (key 20) so that the vent assembly
(key 65, not shown) is correctly oriented, and secure
them with the spring case cap screws (key 21) and
hex nuts (key 22) to nger tightness only.
11. Turn the adjusting nut (key 18) clockwise until
there is enough control spring (key 1) force to
provide proper slack to the diaphragm (key 5)
and attached parts. Using a crisscross pattern,
nish tightening the spring case cap screws
(key 21) and hex nuts (key 22) to 55 to
75 inch-pounds / 6.2 to 8.5 N•m of torque. Then
nish turning the adjusting nut (key 18) to the
desired set pressure setting.
12. Install a replacement closing cap gasket (key 35)
if necessary, and then install the closing cap
(key 3).
Type Y611A or Y611AP Vacuum Breaker
or Relief Valve
Key numbers are referenced in Figure 5.
1. Remove the closing cap (key 3) and turn the
adjusting screw (key 2) counterclockwise until all
compression is removed from the control spring
(key 1).
2. Remove the spring case cap screws (key 21)
and hex nuts (key 22) and lift off the spring case
assembly (key 23). If the only further maintenance is
to change the control spring (key 1), skip to step 10.
7
Page 8
Y610A, Y611A, and Y612A Series
3. Remove the diaphragm (key 5) and attached
parts by tilting it so that the pusher post (key 8)
slips off the lever assembly (key 9). To separate
the diaphragm (key 5) from the attached parts,
unscrew the diaphragm plate cap screw (key 64).
If the only further maintenance is to replace the
diaphragm parts or change the control spring
(key 1), skip to step 8.
4. To replace the lever assembly (key 9), remove the
machine screws (key 11) and lever pin (key 10).
5. To replace the valve stem (key 13) or stem seal
O-ring (key 46) pull the valve stem out of the stem
adaptor (key 60).
6. Grease the replacement stem seal O-ring (key 46)
with a good grade of elastomer lubricant and
install on the valve stem (key 13). Install the valve
stem by pushing it into the stem adaptor (key 60).
7. Install the lever assembly (key 9) into the valve
stem (key 13) and secure the lever assembly
(key 9) with the lever pin (key 10) and machine
screws (key 11).
8. Install the small diaphragm plate gasket (key 7),
diaphragm plate (key 24), and diaphragm (key 5)
on the pusher post (key 8) and attach with the
diaphragm plate cap screw (key 64). Tighten using
30 to 45 foot-pounds / 41 to 61 N•m of torque.
9. Install the pusher post (key 8) plus attached
diaphragm parts onto the lever assembly (key 9).
10. Install the spring case assembly (key 23) and
control spring (key 1) on the diaphragm case
assembly (key 20) so that the vent assembly
(key 65, not shown) is correctly oriented, and secure
them with the spring case cap screws (key 21) and
hex nuts (key 22) to nger tightness only.
11. Turn the adjusting screw (key 2) clockwise until
there is enough control spring (key 1) force to
provide proper slack to the diaphragm (key 5)
and attached parts. Using a crisscross pattern,
nish tightening the spring case cap screws
(key 21) and hex nuts (key 22) to 55 to
75 inch-pounds / 6.2 to 8.5 N•m of torque. Then
nish turning the adjusting screw (key 2) to the
desired set pressure setting.
12. Install a replacement closing cap gasket (key 35)
if necessary, and then install the closing cap
(key 3).
Type Y612A or Y612AP Vacuum Regulator
Key numbers are referenced in Figure 6.
1. Remove the closing cap (key 3) and turn the
adjusting nut (key 18) counterclockwise until all
compression is removed from the control spring
(key 1).
2. Remove the spring case cap screws (key 21)
and hex nuts (key 22) and lift off the spring case
assembly (key 23). If the only further maintenance is
to change the control spring (key 1), skip to step 10.
3. Remove the diaphragm (key 5) and attached
parts by tilting it so that the pusher post (key 8)
slips off the lever assembly (key 9). To separate
the diaphragm (key 5) from the attached parts,
unscrew the diaphragm nut (key 37). If the only
further maintenance is to replace the diaphragm
parts or change the control spring (key 1), skip to
step 8.
4. To replace the lever assembly (key 9), remove the
machine screws (key 11) and lever pin (key 10).
5. To replace the valve stem (key 13) or stem seal
O-ring (key 46) pull the valve stem out of the stem
adaptor (key 60).
6. Grease the replacement stem seal O-ring
(key 46) with a good grade of elastomer lubricant
and install on the valve stem (key 13). Install the
valve stem by pushing it into the stem adaptor
(key 60).
7. Install the lever assembly (key 9) into the valve
stem (key 13) and secure the lever assembly
(key 9) with the lever pin (key 10) and machine
screws (key 11).
8. Install the small diaphragm plate gasket (key 7),
diaphragm plate (key 24), and diaphragm (key 5)
on the pusher post (key 8) and attach with the
diaphragm nut (key 37). Tighten using 30 to
45 foot-pounds / 41 to 61 N•m of torque.
9. Install the pusher post (key 8) plus attached
diaphragm parts onto the lever assembly (key 9).
10. Install the spring case assembly (key 23) and
control spring (key 1) on the diaphragm case
assembly (key 20) so that the vent assembly
(key 65, not shown) is correctly oriented, and secure
them with the spring case cap screws (key 21) and
hex nuts (key 22) to nger tightness only.
8
Page 9
Y610A, Y611A, and Y612A Series
11. Turn the adjusting nut (key 18) clockwise until
there is enough control spring (key 1) force to
provide proper slack to the diaphragm (key 5)
and attached parts. Using a crisscross pattern,
nish tightening the spring case cap screws
(key 21) and hex nuts (key 22) to 55 to
75 inch-pounds / 6.2 to 8.5 N•m of torque. Then
nish turning the adjusting nut (key 18) to the
desired set pressure setting.
12. Install a replacement closing cap gasket (key 35)
if necessary, and then install the closing cap
(key 3).
Parts Ordering
When corresponding with the local Sales Ofce
about this regulator, include the type number and all
other pertinent information stamped on the closing
cap (key 3) or nameplate (key 48). Specify the
eleven-character part number when ordering new
parts from the following parts list.
Parts List (Figures 4 through 6)
Key Description Part Number
1 Control Spring,
Steel See following table
2 Adjusting Screw
Type Y611A or Y611AP,
For aluminum 1L928608012
3 Closing Cap
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP, Aluminum 1L928308012
4 Control Spring Seat
Type Y610A, Y610AP, Y612A, or
Y612AP, Cast iron 1U226019012
5* Diaphragm, Aluminum
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP 1K649602052
7* Small Diaphragm Plate Gasket
Type Y610A, Y610AP, Y611A, or
Y611AP, Aluminum 1L143403022
8 Pusher Post
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP, Aluminum 1L143311992
9 Lever Assembly, Plated steel
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP, Aluminum 1H974028992
10 Lever Pin
Stainless steel 1H972935032
11 Machine Screw (2 required)
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP, Plated steel 1B420428982
12 Control Spring Seat
Steel See following table
13 Stem Assembly
Type Y610A, Aluminum 1H9748000A2
Type Y610AP, Aluminum 1L1426000A2
Type Y611A, Y611AP, Y612A, or
Y612AP, Aluminum 1L2212000A2
15* Diaphragm Case O-ring, Nitrile (NBR) 1F358106992
18 Adjusting Nut (for Type Y610A, Y610AP,
Y612A, or Y612AP only), Brass 1A201914012
*Recommended Spare Part
Key Description Part Number
20 Diaphragm Case Assembly
Type Y610A, Y611A, or Y612A, Aluminum 1H9751X0012
Type Y610AP, Y611AP, or Y612AP, Aluminum 1H9751X0022
21 Spring Case Cap Screw, Plated steel
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP (12 required) 1B136324052
22 Hex Nut, Cadmium Plated steel
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP (12 required) 1A309324122
23 Spring Case Assembly
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP, Aluminum 4L142308032
24 Diaphragm Plate See following table
25* Disk Assembly
(not used with Type Y610A or Y610AP)
Type Y611A, Y611AP, Y612A, or Y612AP,
Aluminum disk holder and Nitrile (NBR) disk 1H9739000A2
26* Disk Assembly Gasket (for Type Y611A, Y611AP,
Y612A, or Y612AP only), Composition 1F826804022
27* Seat Ring
Type Y610A or Y610AP, Aluminum
3/4-inch / 19 mm, port diameter 1H979509022
1-3/6-inch / 30 mm, port diameter 1L220809022
Type Y611A or Y611AP, Aluminum
1-3/6-inch / 30 mm, port diameter 1H980809022
Type Y612A or Y612AP, Aluminum
5/8-inch / 16 mm, port diameter 1H980509022
1-inch / 25 mm, port diameter 1H980709022
1-3/6-inch / 30 mm, port diameter 1H980809022
28 Body
Type Y610A or Y610AP
Cast iron
1-1/2 NPT 1J190319012
2 NPT 1H974919012
NPS 2 / DN 50, CL125 FF anged 2K184219012
Steel
1-1/2 NPT 1K787922012
2 NPT 1K791222012
Type Y611A, Y611AP, Y612A, or Y612AP
Cast iron
1-1/2 NPT 1J190519012
2 NPT 1H974319012
NPS 2 / DN 50, CL125A FF anged 1K184319012
Steel
1-1/2 NPT 1K788022012
2 NPT 1K792222012
29 Diaphragm Case Cap Screw
(for Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP only),
Plated steel (2 required) 1H974724052
31 Seat O-ring Holder
(for Type Y610A or Y610AP only), Aluminum 1L154909012
32 Seat O-ring Washer
(for Type Y610A or Y610AP only), Aluminum 1V5121X0012
35* Closing Cap Gasket, Neoprene (CR)
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP 1N446206992
37 Diaphragm Nut (for Type Y610A, Y610AP,
Y612A, or Y612AP only), Aluminum 1A499724122
38 Body Cap Assembly
Type Y611A, Y611AP, Y612A, or
Y612AP, Aluminum 1R236109022
39* Seat O-ring (for Type Y610A or
Y610AP only), Nitrile (NBR) 1F269206992
40 Valve Stem
Type Y611A, Y611AP, Y612A, or
Y612AP, Aluminum 1H973509082
41 Back Disk Spring
Type Y611A, Y611AP, Y612A, or Y612AP 1L303837022
43 Disk Spacer
Type Y611A, Y611AP, Y612A,
or Y612AP, Aluminum 1H973609012
9
Page 10
Y610A, Y611A, and Y612A Series
154 55
23
51A1731_A
B2048
20
10
20D
46
58
27
35485051
22
5
24
SECTION A-A
7
8
9
52
53
56
18
12
57
66
3
AA
37
13
60
15
47
4
11
21
59
29
28
44
3931
4532
Figure 4. Type Y610AP Vacuum Breaker
SECTION A-A
57
51A1733_A
35
23D
64
4
5B
7
20A
48
5A
22
56
A
53
50
55
51
A
52
54
29
3
21
20D
2
15
13
1
SP
27
AS
43
25
26
40
38
41
8
LS
28
9
PART NOT SHOWN: 20E
AS - ANTI-SEIZE
LS - LEAD SEAL
SP - HOUGHTON STAPUT NO. 14
11
10
10
Figure 5. Type Y611A Relief Valve Assembly
Page 11
Y610A, Y611A, and Y612A Series
51A1737_A
5B
20A
8
10
20D
AS
22
5A
7
9
13
15
28
27
23A
LS
384041262543
15455
51503548
SECTION A-A
52
53
57
56
3
18
66
12
37
4
11
21
29
PART NOT SHOWN: 20E
AS - ANTI-SEAL
LS - LEAD SEAL
AA
TYPES
Y610A and Y610AP
Y611A and Y611AP
Y612A and Y612AP
1. See Tables 1 through 3 for spring ranges.
Color CodePart NumberPart NumberPart NumberQuantity RequiredPart Number
44 Cap Screw (for Type Y610A or
Y610AP only), Aluminum 1E760324052
45 Dyna-Seal Washer
(for Type Y610A or Y610AP only), Aluminum 1F990428982
46* Stem Seal O-ring (for Type Y610AP,
Y611AP, or Y612AP only), Nitrile (NBR) 1E216306992
50 Flapper Stem
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP 1H976335022
51 Lower Flapper
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP 1H976406992
52 Upper Flapper
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP 1H976506992
53 Flapper Seat (for Type Y610A, Y610AP,
Y611A, Y611AP, Y612A, or Y612AP only),
Stainless steel T13609T0012
54 Self Tapping Screw (3 required)
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP 1H976728982
*Recommended Spare Part
Key Description Part Number
55 Spring (2 required)
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP 1H976837022
56 Screen
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP 1E564843122
57 Snap Ring
Type Y610A, Y610AP, Y611A, Y611AP,
Y612A, or Y612AP 1E564937022
58 Retaining Ring
Type Y610AP, Y611AP, or Y612AP 1L142838992
59 O-Ring Type Y610AP, Y611AP, or Y612AP 1L142906992
60 Stem Adaptor
Type Y610AP, Y611AP, or Y612AP 1L143109012
64 Diaphragm Plate Cap Screw,
Plated steel See table on page 11
65 Type Y602-1 Vent Assembly,
Spring Case Up Type Y602-11
Spring Case Down Type Y602-2
66 Stem
Type Y610A, Y610AP, Y612A, or Y612AP 1A626314012
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-Pacic
Shanghai 201206, China
Tel: +86 21 2892 9000
Europe
Bologna 40013, Italy
Tel: +39 051 419 0611
Middle East and Africa
Dubai, United Arab Emirates
Tel: +971 4811 8100
For further information visit www.fisherregulators.com
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 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 specications 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.
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-Pacic
Singapore 128461, Singapore
Tel: +65 6770 8337
Europe
Bologna 40013, Italy
Tel: +39 051 419 0611
Chartres 28008, France
Tel: +33 2 37 33 47 00
TESCOM
Emerson Process Management
Tescom Corporation
USA - Headquarters
Elk River, Minnesota 55330-2445, USA
Tels: +1 763 241 3238
+1 800 447 1250
Europe
Selmsdorf 23923, Germany
Tel: +49 38823 31 287