Emerson Y610A, Y611A, Y612A Data Sheet

Bulletin 71.3:Y610A

Y610A, Y611A, and Y612A Series Vacuum
Service Equipment and Relief Valves

July 2013

W1094_1

Figure 1. Type Y610A or Y610AP Vacuum Breaker

Introduction

The Y610A, Y611A, and Y612A Series
devices (Figures 1 through 4) are used in a wide
variety of vacuum and relief service applications. The
Y610A Series devices 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.

Features

  •  Precision Control of Low-Pressure Setting—

Large diaphragm areas provide more accurate
control at low-pressure settings.

•  Corrosion Resistance—Constructions are
available in a variety of materials for compatibility
with corrosive process gases.

•  Installation Adaptability—360-degree
adjustability of the body/diaphragm case connection

and four-position vent mounting permit exibility in

vent positioning and installation in awkward positions
or limited spaces. Units may be mounted in any
orientation without affecting proper operation.

•  Tamper-Resistant Adjustment—Closing cap and
spring case on most types allow installation of sealing
wire to discourage or detect unauthorized adjustment
of the pressure setting (Figure 2).

•  Rugged Construction—Diaphragm case and
internal parts are designed to withstand vibration
and shock.

www.fisherregulators.com

D103115X012

Bulletin 71.3:Y610A

Specications

Available Congurations

See Table 1

Body Sizes (Inlet x Outlet) and 
End Connection Style

(1)

Type Y610A, Y610AP, Y611A, Y611AP, 
  Y612A, or Y612AP:

1-1/2 x 1-1/2, 2 x 2 NPT, or
NPS 2 x 2 / DN 50 x 50, CL125 FF, or
CL250 RF anged

Pressure Information

(2)

Type Y610A or Y610AP 
  Vacuum Breaker: See Table 2
Type Y611A or Y611AP    
  Relief Valve: See Table 3
Type Y612A or Y612AP 
  Vacuum Regulator: See Table 4

Port Diameters and Flow Coefcients

TYPE NUMBER

Y610A, Y610AP,

Y611A, Y611AP

Y612A, Y612AP

SEAT RING 

PORT DIAMETER

Inch mm

1-3/16 30 720

5/8

1

1-3/16

16

25

30

Cg WITH FULLY 

OPEN DISK

150
450

720

C

1

35

Typical Flow Capacities and Performance Curves
  Y610A Series Vacuum Breakers: See Table 5

and Capacity Information section
Y611A Series Vacuum Breakers: See Capacity
Information section
Y611A Series Relief Valves: See Table 6, Figure 5,
and Capacity Information section
Y612A Series Vacuum Regulators: See Table 7,
Figure 6, and Capacity Information section

Construction Materials
  Body: Cast Iron (standard)

Spring and Diaphragm Cases 
NPS 1-1/2 x 1-1/2 or 2 x 2 / DN 40 x 40 or
50 x 50 Body: Aluminum

Control Spring: Steel
  Diaphragm Plate: Steel

Diaphragm and if Used, O-rings and 
  Wiper Ring: Nitrile (NBR)
  Disk

NPS 1-1/2 x 1-1/2 through 2 x 2 / DN 40 x 40
through 50 x 50 Body: Nitrile (NBR) (standard),

or Fluorocarbon (FKM)

Seat Ring, Pusher Post, Stem Parts, Disk Holder,  
  Adjusting Screw, and if Used, Body Cap

NPS 1-1/2 x 1-1/2 through 2 x 2 / DN 40 x 40
through 50 x 50 Body: Aluminum

Lever Assembly

NPS 1-1/2 x 1-1/2 or 2 x 2 / DN 40 x 40
or 50 x 50 Body: Zinc-plated steel

Gaskets: Nitrile (NBR) or composition depending
on location
Stabilizer Vent Flappers if Used: Nylon (PA)
Flapper Spring, Disk Spring, Screen, and    
  if Used, Snap Ring: Stainless steel
Bolting: Plated steel
Other Metal Parts: Steel, brass, stainless steel,
zinc, and/or aluminum depending on construction

Temperature Capabilities

-20 to 150°F / -29 to 66°C

(2)

Pressure Setting Adjustment

Adjusting screw

Pressure Registration

See Table 1

Pressure Connections

See Figures 11 and 12

Approximate Weights
  Type Y610A, Y610AP, Y611A, Y611AP, 
  Y612A, or Y612AP

With NPS 1-1/2 x 1-1/2 / DN 40 x 40 Body:
25 pounds / 11 kg
With NPS 2 x 2 / DN 50 x 50 Body:
30 pounds / 14 kg

Additional Options

PTFE diaphragm protector

1. The pressure/temperature limits in this Bulletin and any applicable standard limitation should not be exceeded.

2. Ratings and end connections for other than ANSI standards can usually be provided, consult your local Sales ofce.

2

TWO WAY 
STABILIZER 
VENT

Bulletin 71.3:Y610A

VACUUM TO 

BE LIMITED

W1079_1

(ALSO TYPICAL OF TYPE Y610AP)

Figure 2. Y610A Series Vacuum Breaker Construction

CONTROL LINE TO SPRING CASE

W1083_1

TYPE Y610A

TYPE Y611A

INLET 

PRESSURE

ATMOSPHERIC

INLET

VACUUM TO 

BE LIMITED

Figure 3. Y611A Series Vacuum Breaker Construction

Y610A and Y611A Series
Vacuum Breakers

These vacuum breakers are used in applications where
an increase in vacuum must be limited. An increase
in vacuum (decrease in absolute pressure) beyond a
certain value registers underneath the diaphragm of
a Y610A Series vacuum breaker (Figure 2) or above
the diaphragm of a Y611A Series vacuum breaker with
control line (Figure 3), opening the disk in either case.
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.

Y611A Series Relief Valves

A Y611A Series relief valve maintains 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, relieving the excess pressure and

restoring the inlet pressure to its original setting.

3

Bulletin 71.3:Y610A

VACUUM BEING 

REGULATED

W1084_1

TYPE Y612A (ALSO TYPICAL OF TYPE Y612AP)

Figure 4. Y612A Series Vacuum Regulator Construction

Y612A Series Vacuum Regulators

These vacuum regulators (Figure 4) maintain a constant
vacuum at the regulator inlet. A decrease in this
vacuum (increases 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.

Capacity Information

Tables 5, 6, and 7 give selected ow capacity

information for Y610A, Y611A, and Y612A Series

devices, respectively. Flows are in SCFH (60°F and

14.7 psia) of air at 60°F. To determine equivalent
capacities of 0.6 specic gravity natural gas,
propane, butane, or nitrogen, multiply the Table 5, 6,

or 7 capacity by the following appropriate conversion

factor: 1.29 for 0.6 natural gas, 0.810 for propane,

0.707 for butane, or 1.018 for nitrogen. For gases of
other specic gravities, multiply the given capacity by

1.0, and divide by the square root of the appropriate
specic gravity. Then, if capacity is desired in normal
cubic meters per hour at 0°C and 1.01325 bar,
multiply SCFH by 0.0268.

HIGHER VACUUM 

SOURCE

To determine capacities at outlet or relief set pressure

not given in Table 5, 6, or 7, use one of the following

formulas and convert according to the factors in the
preceding paragraph if necessary:

Vacuum Breaker or Vacuum
Regulator Application

P

Q

=

where,

Q = ow capacity in SCFH (60°F and 14.7 psia)

of air at 60°F

P
(P

Cg = ow coefcient (from Specications section)

C1 = 35 (from Specications section)

∆P = pressure drop across vacuum breaker
or regulator

= absolute Inlet pressure in psia

1 abs

sin

1 abs Cg

gauge + 14.7)

1

)

∆P3415

C

P

1

1 abs

)

deg

(1)

4

Bulletin 71.3:Y610A

Note that if the actual change in outlet (controlled)

pressure (from the service condition) is less than the

change in outlet (controlled) pressure required to fully
open the vacuum breaker or regulator Table 2 or 5,

the Cg in formula (1) must be reduced accordingly.
To obtain the correct reduced Cg, multiply the

Specications section Cg by the ratio of the actual

change in outlet (controlled) pressure to the change

in outlet (controlled) pressure required to fully open

the vacuum breaker or regulator.

Relief Valve Application

Q = (P1 + buildup)

x sin

where,

Q = ow capacity in SCFH

(P1 + buildup)
buildup in psi +14.7 to determine
absolute pressure

Cg = ow coefcient

(from Specications section)

C1 = 35 (from Specications section)

(P1 + buildup)
buildup in psi

Note that if the actual buildup is less than the buildup
required to fully open the relief valve (Table 3), the Cg

in formula (2) must be reduced accordingly. To obtain
the correct reduced Cg, multiply the Specications
section Cg by the ratio of the actual buildup to the

buildup required to fully open the relief valve.

3415

)

C

abs Cg

(P1 + buildup)

(P1 + buildup)

1

= set pressure (gauge) in psi +

abs

= set pressure (gauge) in psi +

gauge

gauge

abs

)

deg

(2)

Example Problems Using Formulas

Example Problem 1

This problem involves a Type Y610A vacuum breaker with
its outlet connected to vessel in which the vacuum must
be limited. This breaker has a 1-3/16-inch / 30 mm seat

ring and control spring 0B019727052 set to start opening

and admit atmospheric pressure whenever the vacuum
pump downstream from the vessel increases the vessel
vacuum to more than 4-inches w.c. / 10 mbar. It desired

to nd the air ow by the time the pump has increased the
vessel vacuum to 8-inches w.c. / 20 mbar and the breaker
has opened more. To nd the air ow through the breaker

under these conditions, perform the following steps:

1. Check whether the change in outlet (controlled)
pressure of 4-inches w.c. or 0.144 psig / 10 mbar
is less than the change in outlet (controlled) pressure

required to fully open the vacuum breaker.

Because the change in outlet (controlled) pressure
required to fully open a Type Y610A vacuum breaker

with a 1-3/16-inch / 30 mm seat ring and control spring

0B019727052 is 0.143 psig / 10 mbar from Table 2, no

reduction in the regulating Cg of 720 (Specications
section) need to be made.

2. Solve the problem by using the appropriate values in

formula (1) as follows, remembering that the ∆P
across the vacuum breaker is 8-inches w.c. or

0.289 psig / 20 mbar:

14.7 (720) sin

=

Q

= 2503 SCFH / 67.1 Nm3/h

3415

)

35

0.289

14.7

)

deg

Installation

The versatility of the Y610A, Y611A, and Y612A Series
devices permits a wide variety of installations as
shown in Figures 7 through 10.

The body may be mounted in any position (360-degree
rotation possible) relative to the spring and diaphragm
cases just by loosening the union nut or cap screws and
rotating the diaphragm case. Spring case connection
location are shown in Figure 11. Any possible mounting

position will provide excellent performance. However,
when exposed to the weather, the spring case

connection should be protected by an optional vent or
should be pointed downward to allow condensate to
drain. On indoor installations, this connection should be
piped outdoors if used in hazardous gas service.

Downstream piping will vary with the installation, but to
obtain the calculated characteristics, the pipe should
be the same size as the outlet and should be straight

for the rst 18-inches / 460 mm.

External dimensions and connection sizes are given in

Figure 12.

5

Bulletin 71.3:Y610A

Table 1. Available Congurations

CONSTRUCTION

Vacuum breaker x x - - - - - - - - - - - - - - - -

Vacuum breaker or relief valve - - - - - - - - x x - - - - - - - -

Relief pilot with solid throat - - - - - - - - - - - - - - - - - - - - - - - -

Relief pilot with bleed hole in throat for Type 66RR - - - - - - - - - - - - - - - - - - - - - - - -

Vacuum regulator - - - - - - - - - - - - - - - - x x

1-1/2 or 2 NPT end connections and spring case
with 1 NPT screened vent

Internal registration x - - - - x - - - - - - - - - - - -

External registration with 1/2 NPT downstream

control line connection

Light diaphragm plate(s) x x x x x x

Heavy diaphragm plate(s) - - - - - - - - - - - - - - - - - - - - - - - -

O-ring stem seal - - - - x - - - - x - - - - x

Y610A Y610AP Y611A Y611AP Y612A Y612AP

x x x x x x

- - - - x - - - - x - - - - x

TYPE NUMBER 

Table 2. Types Y610A and Y610AP Vacuum Breaker Pressure Information

CHANGE 

IN OUTLET 

(CONTROLLED) 

PRESSURE 

REQUIRED TO 

FULLY OPEN 

VACUUM BREAKER

0.043 3

0.078 5

0.143 10

0.181 12

0.378 26

1.944 134

TYPE 

NUMBER

Y610A,

Y610AP

MAXIMUM 

ALLOWABLE

 INLET (BODY)

PRESSURE

psig bar psig bar

13 0.90 15 1.0

MAXIMUM 

EMERGENCY 

OUTLET 

(CASING) 
PRESSURE 
(POSITIVE)

OUTLET 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 /

0.02 to 0.21 bar

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 /

0.02 to 0.21 bar

MAXIMUM 

ALLOWABLE 

VACUUM

psig bar psig mbar

5.1 0.35

5.2 0.36

5.3 0.37

5.6 0.39

6.1 0.42

8.0 0.55

CONTROL 

SPRING

COLOR CODE, 

PART NUMBER

Brown Stripe,
1D892527022

Pink Stripe,

1D765427012

Purple Stripe,

1B0197000A2

Gray,

1B766627062

Unpainted,

1B883327022

Black,

1A630627022

6

Table 3. Types Y611A and Y611AP Relief Valve Pressure Information

Bulletin 71.3:Y610A

MAXIMUM 

OPERATING

INLET (RELIEF) 

PRESSURE TO 

PREVENT PART 

DAMAGE

5.1 0.35

5.2 0.36

5.3 0.37

5.5 0.38

6 0.41

6.5 0.45

7.5 0.52

(1)

INLET RELIEF 

SET PRESSURE RANGE 

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 /

0.05 to 0.10 bar

1 to 2.5 psig /

0.07 to 0.17 bar

With Spring Case 
Below Diaphragm

2 to 3 inches w.c. /

5 to 7 mbar

2.75 to 5 inches w.c. /

7 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 /

0.05 to 0.10 bar

1 to 2.5 psig /

0.07 to 0.17 bar

CONTROL 

SPRING

COLOR CODE,

PART NUMBER

Red,

1D892627022

Red,

1D892627022

Black Stripe,

1D892727012

White Stripe,

1D893227032

Green,

1D893327032

Blue,

1H975827032

Orange,

1H975927032

TYPE 

NUMBER

Y611A,

Y611AP

1. Including buildup.

 INLET (CASING)

MAXIMUM 

ALLOWABLE

PRESSURE

psig bar psig bar

15 1.0

(1)

Table 4. Types Y612A and Y612AP Vacuum Regulator Pressure Information

MAXIMUM 

ALLOWABLE

 INLET 

(CASING) 

PRESSURE

psig bar psig bar

15 1.0

1. With spring case above the diaphragm as shown in Figure 4. With spring case below diaphragm, range 0.6-inch w.c. / 1 mbar lower in each end.

MAXIMUM 

OPERATING 

INLET 

PRESSURE 

TO PREVENT 

PART 

DAMAGE 

5.1 0.35

5.2 0.36

5.3 0.37

5.6 0.39

6.1 0.42

8.0 0.55

OUTLET 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 /

0.02 to 0.21 bar

(1)

With Spring Case 
Below Diaphragm

0 to 2 inches w.c. /

0 to 5 mbar

0.5 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 /

0.02 to 0.21 bar

MAXIMUM 

ALLOWABLE 

VACUUM

psig bar

5.1 0.35 1D892527022

5.2 0.36 1D765427012

5.3 0.37 0B019727052

5.6 0.39 1B766627062 Gray 0.227 16 0.134 9 0.193 13

6.1 0.42 1B883327022 Unpainted 0.405 28 0.240 17 0.345 24

8.0 0.55 1A630627022 Black 1.944 134 1.152 79 1.656 114

CONTROL 

SPRING

Part 

Number

Color 
Code

Brown

Stripe

Stripe

Purple

Stripe

CHANGE IN OUTLET (CONTROLLED) 

PRESSURE REQUIRED TO FULLY 

5/8-Inch /

16 mm

Port 

Diameter

psig mbar psig mbar psig mbar

0.089 6 0.053 4 0.076 5

Pink

0.124 9 0.074 5 0.106 7

0.189 13 0.112 8 0.161 11

BUILDUP OVER INLET 

PRESSURE REQUIRED 

TO FULLY OPEN 

RELIEF VALVE

psig mbar

0.089 6

0.100 7

0.124 9

0.216 15

0.351 24

0.648 45

1.026 71

OPEN VACUUM REGULATOR

1-Inch /

25 mm

Port 

Diameter

1-3/16-Inch /

30 mm

Port 

Diameter

Table 5. Selected Y610A Series Vacuum Breaker Capacities

CONSTRUCTION, 

NPS / DN

1-1/2 or 2 /

40 or 50

Type Y610A

1. See Capacity Information section for conversion to equivalent capacities of other gases and/or Nm3/h.

Part Number Outlet Setting, Vacuum Offset, Vacuum

1D892527022
1D765427012
0B019727052

1B766627062
1B883327022

1A630627022

CONTROL SPRING

2 inches w.c. / 5 mbar

4 inches w.c. / 10 mbar
7 inches w.c. / 17 mbar

14 inches w.c. / 35 mbar
28 inches w.c. / 70 mbar

2 psig / 0.14 bar

1 inch w.c. / 2 mbar
1 inch w.c. / 2 mbar
1 inch w.c. / 2 mbar

2 inches w.c. / 5 mbar

6 inches w.c. / 15 mbar

0.4 psig / 0.03 bar

CAPACITY, SCFH / Nm3/h OF AIR

(INLET PRESSURE IS ATMOSPHERIC)

1000 / 26.8
1400 / 37.5
1800 / 48.2

1800 / 48.2
1900 / 50.9
2500 / 67.0

(1)

7

Bulletin 71.3:Y610A

5

4

300

3

1H975927032

2

INLET PRESSURE, psig

1

0

B1664_1

0

1H975827032

2000 /

53.6

1D893327032

1D893227032

1D892527022, 1D892627022, OR 1D892727012

4000 /

107

FLOW RATE, SCFH / Nm3/h OF AIR

6000 /

161

NPS 1-1/2 OR 2 / DN 40 OR 50 TYPE Y611A WITH 1-3/16-INCH / 30 mm SEAT RING

NOTE:

SEE CAPACITY INFORMATION SECTION FOR CONVERSION TO EQUIVALENT 
CAPACITIES OF OTHER GASES AND/OR CUBIC METERS PER HOUR.  EACH  
CURVE REPRESENTS A DIFFERENT CONTROL SPRING AS MARKED AND 
INITIAL RELIEF SET PRESSURE FOR THAT SPRING AS GIVEN IN TABLE 6.  
DO NOT BASE YOUR CAPACITY ON A CONTROL SPRING SETTING HIGHER 
THAN THE MAXIMUM OPERATING INLET (RELIEF) PRESSURE TO PREVENT 
PART DAMAGE AS GIVEN IN TABLE 3.

Figure 5. Typical Performance Curves for Y611A Series Relief Valves

3

8000 /

214

10,000 /

SPRING 1A630627022 WITH 
1-3/16-INCH / 30 mm
SEAT RING

268

12,000 /

322

200

100

INLET PRESSURE, mbar

0

200

OUTLET PRESSURE 

7.33 psig / 0.51 bar VACUUM

2000 /

53.6

2500 /

67.0

B1665_1

2

1

INLET PRESSURE, psig VACUUM

SPRING 1B883327022 WITH 5/8-INCH / 16 mm SEAT RING

0

0

500 /

13.4

1000 /

26.8

1500 /

40.2

FLOW RATE, SCFH / Nm3/h OF AIR

NPS 1-1/2 OR 2 / DN 40 OR 50 TYPE Y612A 

NOTE:

SEE CAPACITY INFORMATION SECTION FOR CONVERSION TO EQUIVALENT 
CAPACITIES OF OTHER GASES AND/OR CUBIC METERS PER HOUR.  EACH  
CURVE REPRESENTS A DIFFERENT CONTROL SPRING, SEAT RING PORT 
DIAMETER, AND OUTLET PRESSURE AS MARKED.  THE INITIAL PRESSURE  
SETTING FOR THE CONTROL SPRING IS GIVEN IN TABLE 7.

Figure 6. Typical Performance Curves for Y612A Series Vacuum Regulators

SPRING 1A630627022 WITH 
1-INCH / 25 mm SEAT RING

3000 /

80.4

3500 /

93.8

4000 /

107

100

INLET PRESSURE, mbar VACUUM

0

8

Table 6. Selected Y611A Series Relief Valve Capacities

Bulletin 71.3:Y610A

CONSTRUCTION, 

NPS / DN

1-1/2 or 2 /

40 or 50

Type Y611A

1. See Capacity Information section for conversion to equivalent capacities of other gases and/or Nm3/h.

CONTROL 

SPRING PART 

NUMBER

1D892527022 4 inches w.c. / 10 mbar

1D892727012 7 inches w.c. / 17 mbar

1D893227032 14 inches w.c. / 35 mbar 2500 / 67 4000 / 107 5000 / 134 5500 / 147 6500 / 174 7500 / 201

1D893327032 21 inches w.c. / 52 mbar 3000 / 80.4 4000 / 107 5000 / 134 6000 / 161 7000 / 188 8000 / 214

1H975827032 1 psig / 0.07 bar 3000 / 80.4 4000 / 107 5500 / 147 6500 / 174 7500 / 201 8000 / 214

1H975927032

RELIEF SET PRESSURE

1.25 psig / 0.09 bar 2000 / 53.6 4000 / 107 5000 / 134 6000 / 161 7500 / 201 8500 / 228

2.5 psig / 0.17 bar 3500 / 93.8 5500 / 147 7000 / 188 8000 / 214 9500 / 255 10,500 / 281

7 inches w.c. /

CAPACITY, SCFH / Nm3/h OF AIR

17 mbar

3000 / 80.4 4000 / 107 4500 / 121 5000 / 134 6000 / 161 7000 / 1881D892627022 5 inches w.c. / 12 mbar

14 inches w.c. /

35 mbar

- continued -

Table 6. Selected Y611A Series Relief Valve Capacities (continued)

CONSTRUCTION, 

NPS / DN

1-1/2 or 2 /

40 or 50

Type Y611A

1. See Capacity Information section for conversion to equivalent capacities of other gases and/or Nm3/h.

- Shaded areas show where maximum operating inlet (relief) pressure to prevent part damage is exceeded.

CONTROL 

SPRING PART 

NUMBER

1D892527022 4 inches w.c. / 10 mbar

1D892727012 7 inches w.c. / 17 mbar

1D893227032 14 inches w.c. / 35 mbar 8000 / 214 9000 / 241 10,500 / 281 11,300 / 303

1D893327032 21 inches w.c. / 52 mbar 8500 / 228 9500 / 255 10,500 / 281 11,600 / 311

1H975827032 1 psig / 0.07 bar 9000 / 241 10,000 / 268 11,000 / 295 11,800 / 316

1H975927032

RELIEF SET PRESSURE

1.25 psig / 0.09 bar 9500 / 255 10,000 / 268 11,000 / 295 12,000 / 322 13,000 / 348

2.5 psig / 0.17 bar 10,800 / 289 11,300 / 303 12,300 / 330 13,300 / 356

CAPACITY, SCFH / Nm3/h OF AIR

2.5 psig /

0.17 bar

8000 / 214 8500 / 228 10,000 / 268 11,000 / 2951D892627022 5 inches w.c. / 12 mbar

3 psig /

0.21 bar

(1) 

RELIEF SET PRESSURE

21 inches w.c. /

RELIEF SET PRESSURE

AT FOLLOWING BUILD-UP OVER 

52 mbar

0.28 bar 

1 psig /

0.07 bar

(1) 

AT FOLLOWING BUILD-UP OVER 

4 psig /

1.5 psig /

5 psig /

0.34 bar

0.10 bar

2 psig /

0.14 bar

6 psig /

0.41 bar

Table 7. Selected Y612A Series Vacuum Regulator Capacities

CONSTRUCTION, 

NPS / DN

5/8-inch /

16 mm

Seat Ring

1-1/2 or 2 /

40 or 50

Type Y612A

1. See Capacity Information section for conversion to equivalent capacities of other gases and/or Nm3/h.

1-inch /

25 mm

Seat Ring

1-3/16-inch /

30 mm

Seat Ring

Part Number Inlet Setting, Vacuum Offset, Vacuum

1B883327022 16-inches w.c. / 40 mbar 3 inches w.c. / 7 mbar 1500 / 40.2

1A630627022 1 psig / 0.07 bar 0.2 psig / 0.01 bar 2000 / 53.6

1A630627022 3 psig / 0.21 bar 0.6 psig / 0.04 bar 3900 / 105

CONTROL SPRING CAPACITY, 

SCFH / Nm3/h

OF AIR

(1)

AT OUTLET 
PRESSURE

(VACUUM) OF:

7.33 psig / 0.51 bar

9

Bulletin 71.3:Y610A

VACUUM

BEING

LIMITED

VACUUM PUMP

Y610A SERIES

VACUUM BREAKER

POSITIVE PRESSURE OR ATMOSPHERE,
OR A LESSER VACUUM THAN THE
VACUUM BEING LIMITED

A2991

INLET PRESSURE

P

1

BEING CONTROLLED

OR PROTECTED

P

ATMOSPHERIC OR ANY PRESSURE
LESS THAN P

A2993_2

1

Y611A SERIES
RELIEF VALVE

2

Figure 7. Typical Y610A Series Vacuum Breaker Installation

ATMOSPHERIC

ONLY

Y611A SERIES

VACUUM BREAKER

VACUUM

BEING

LIMITED

VACUUM PUMP

Figure 9. Typical Y611A Series Relief Valve Installation

Y612A SERIES

VACUUM REGULATOR

HIGHER VACCUM SOURCE

UNAVOIDABLE

LEAKAGE

VACUUM PUMP

VACUUM

BEING

CONTROLLED

A2992

Figure 8. Typical Y611A Series Vacuum Breaker Installation

10

A2294_1

Figure 10. Typical Y612A Series Vacuum Regulator Installation

Bulletin 71.3:Y610A

F

C

E

CJ4598_B

Figure 11. Spring Case Connection Locations

2

B

A

B1666_1

NOTE:

1

TAPPED 1/2 NPT IF CONSTRUCTION 
REQUIRES DIAPHRAGM CASE PIPING

2

A

B

=

2

G

(MAXIMUM)

Figure 12. Dimensions

Table 8. Dimensions

BODY SIZE,

NPS / DN

1-1/2 x 1-1/2 / 40 x 40

2 x 2 / 50 x 50

NPT 

Connections

6.12 / 156

6.12 / 156

A C

CL125 FF  

Flanged

Connections

- - - -

10.0 / 254

CL250 RF 

Flanged

Connections

- - - -

10.5 / 267

D

D

F

E

NPS 1-1/2 OR 2 / DN 40 OR 50 BODY

DIMENSIONS, INCH / mm

Y610A and

Y612A Series

Devices

12.88 / 327

12.88 / 327

Y611A Series

Devices

12.88 / 327

12.88 / 327

14.12 / 359

14.12 / 359

1 NPT
SCREENED
VENT

1

D E F

18.12 / 460

17.69 / 449

11.06 / 281

10.62 / 270

C

G (MAXIMUM)

Y610A Series

Devices

1.44 / 37

2.19 / 56

Y611A and

Y612A Series

Devices 

2.33 / 59

3.12 / 79

Ordering Information 

When ordering, specify:

Application

1. Composition and specic gravity of the gas

(including chemical analysis if possible).

2. Range of temperatures, owing inlet pressure
(maximum, minimum, nominal), and pressure drops.

3. Desired pressure setting or range.

4. Range of the ow rates (minimum controlled,
maximum, normal).

5. Piping size(s).

Construction

Refer to the Specications section and to each

referenced table: specify the desired selection
whenever there is a choice to be made. Always be sure
to specify the complete Y610A, Y611A, or Y612A Series

type number from the Specications section and the

spring case connection location from Figure 11.

11

Bulletin 71.3:Y610A

Ordering Guide

Type (Select One)

Type Y610A
Type Y610AP
Type Y611A
Type Y611AP
Type Y612A
Type Y612AP

Body Size (Select One)
1-1/2 NPS / DN 40
2 NPS / DN 50

Body Material and End Connection Style (Select One)
NPT
CL125 FF (Not Available for Type Y612A)

Control Pressure Range (Select One)
Type Y610A, Y610AP, Y612A, or Y612AP

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 / 0.02 to 0.21 bar

Type Y611A or Y611AP

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 / 0.05 to 0.10 bar

1 to 2.5 psig / 0.07 to 0.17 bar

Industrial Regulators

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Regulator Technologies, Inc.

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Regulator Technologies, Inc.

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Tel: [phone]
Outside U.S. [phone]

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