Emerson Y690VB Data Sheet

Bulletin 71.3:Y690VB

Y690VB Series Vacuum Breakers

February 2010

W7292

Figure 1. Type Y690VB Vacuum Breaker

Features

• Common Spare Parts:

The Types Y690VB and Y690VBM have common
spare parts with the other Y690A Series products.

• Tamper–Resistant Adjustment:

Closing cap and spring case on many types allow
installation of sealing wire to discourage or detect
unauthorized adjustment of pressure setting.

• Easy Conversion:

The Type Y690VB converts easily to the
Type Y690VBM.

• Precision Control of Low-Pressure Settings:

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.

Introduction

The Y690VB Series direct-operated vacuum breakers
are used for precise control of small capacity and
low-pressure service applications where an increase
in vacuum must be limited. The Type Y690VB has
internal pressure registration. The Type Y690VBM has
a control line connection and an O-ring stem seal for
external pressure registration.

www.sherregulators.com

D102593X012

Bulletin 71.3:Y690VB

Specications

Available Congurations

Type Y690VB: Direct-operated vacuum breaker
with internal registration.

Type Y690VBM: Direct-operated vacuum breaker
equipped with a blocked throat and control line
connection for external pressure registration.

Body Sizes

NPS 3/4 or 1 (DN 20 or DN 25)

End Connection Styles

See Table 1

Maximum Allowable Inlet Pressure

(1)

150 psig (10,3 bar)

Maximum Outlet (Casing) Pressure

(1)

Full Vacuum

Maximum Emergency Outlet Pressure to Avoid
Internal Parts Damage

(1)

150 psig (10,3 bar)

Vacuum Control Pressure Ranges

(1)

See Table 4

Construction Materials

See Table 3

Temperature Capabilities

(1)

Nitrile (NBR):

-20° to 180°F (-29° to 82°C)
Fluorocarbon (FKM):
40° to 300°F (4° to 149°C)
Ethylenepropylene (EPDM):

-20° to 300°F (-29° to 149°C)
Peruoroelastomer (FFKM):

-20° to 300°F (-29° to 149°C)

Pressure Registration

Type Y690VB: Internal
Type Y690VBM: External

Orice Size

1/4-inch (6,3 mm)
1/2-inch (13 mm)

Pressure Setting Adjustment

Adjusting Nut

Spring Case Connection

1/4 NPT

Flow Coefcients

See Table 2

Flow Capacities

See Table 6

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

Table 1. End Connection Styles

BODY SIZE,

NPS (DN)

3/4 (20)
1 (25)

1. All ange dimensions are 14-inches (356 mm) face-to-face.

END CONNECTION STYLE

Ductile Iron Stainless Steel

NPT

NPT, SWE, or ASME

(1)

CL150 RF

Diaphragm Case Connection

1/2 NPT

Approximate Weight

19 pounds (9 kg)

Table 2. Flow Coefcients

ORIFICE SIZE
INCHES (mm)

1/4 (6,3) 50 1.4 35

1/2 (13) 200 5.7 35

FLOW COEFFICIENT

C

g

C

v

C

1

2

VACUUM PUMP

Type Y692

July 2007

Type Y692

Bulletin 71.3:Y690VB

VACUUM BEING LIMITED

INLET PRESSURE

CONTROL PRESSURE (VACUUM)

INLET PRESSURE

CONTROL PRESSURE (OUTLET PRESSURE)

ATMOSPHERIC PRESSURE

ATMOSPHERIC PRESSURE

B2672

Figure 2. Y690VB Series Operational Schematic

POSITIVE PRESSURE OR ATMOSPHERE, OR A

LESSER VACUUM THAN THE ONE BEING LIMITED

3

Bulletin 71.3:Y690VB

Table 3. Construction Materials

BODY SPRING CASE DIAPHRAGM CASE TRIM DIAPHRAGM DISK

Ductile iron or CF8M

Stainless steel

Table 4. Vacuum Control Pressure Ranges

Ductile iron or

CF8M Stainless steel

CF8M Stainless steel

Ductile iron or

S303 Stainless steel

Nitrile (NBR) or

Fluorocarbon (FKM)

Nitrile (NBR) or

Fluorocarbon (FKM)

VACUUM

CONTROL

PRESSURE

(1)(2)

RANGE

0 to 4-inches w.c.

(0 to 10 mbar)

0 to 1.0 psig

(0 to 0,07 bar)

0 to 2.1 psig

(0 to 0,15 bar)

0 to 5 psig

(0 to 0,35 bar)

1. Spring ranges based on atmospheric inlet pressure.

2. To convert to inches Hg, multiply psig value by 2.04.

CHANGE IN VACUUM TO WIDE-OPEN

1/4-inch

(6,3 mm) Orice

0.6-inches w.c.
(1,5 mbar)

10-inches w.c.

(25 mbar)

1.2 psig

(0,08 bar)

3.2 psig

(0,22 bar)

1/2-inch

(13 mm) Orice

1.3-inches w.c.
(3 mbar)

0.7 psig

(0,05 bar)

2.4 psig

(0,17 bar)

6.3 psig

(0,43 bar)

Table 5. Maximum Setpoints for Achieving Wide-Open Flow

SPRING RANGE,

PART NUMBER,
AND COLOR

0 to 4-inches w.c.

(0 to 10 mbar)
0N039427222

Unpainted

0 to 1.0 psig
(0 to 0,07 bar)
0N086127022

Unpainted

0 to 2.1 psig
(0 to 0,14 bar)

0N004327022

Yellow

0 to 5 psig

(0 to 0,34 bar)

1D141827012

Dark blue

1. Spring ranges based on atmospheric inlet pressure.

2. To convert to inches Hg, multiply psig value by 2.04.

(1)(2)

ORIFICE SIZE
INCHES (mm)

1/4 (6,3)

1/2 (13)

1/4 (6,3)

1/2 (13)

1/4 (6,3)

1/2 (13)

1/4 (6,3)

1/2 (13)

MAXIMUM
ALLOWED

VACUUM

5.1 psig

(0,35 bar)

6.0 psig

(0,41 bar)

7.1 psig

(0,49 bar)

12.0 psig

(0,83 bar)

MAXIMUM SETPOINTS FOR ACHIEVING WIDE-OPEN FLOW AT SPECIFIC INLET PRESSURES

0 Psi (0 bar) 25 Psi (1,7 bar) 50 Psi (3,4 bar) 75 Psi (5,2 bar) 100 Psi (6,9 bar) 125 Psi (8,6 bar)

4-inches w.c.

(10 mbar)

4-inches w.c.

(10 mbar)

1 psig

(0,07 bar)

1 psig

(0,07 bar)

2.1 psig

(0,14 bar)

2.1 psig

(0,14 bar)

5.0 psig

(0,34 bar)

5.0 psig

(0,34 bar)

1 psig

2.1 psig

5.0 psig

5.0 psig

SPRING WIRE

DIAMETER

INCHES (mm)

2.5-inches w.c.
(6,2 mbar)

0-inches w.c.

(0 mbar)

0.96 psig

(0,07 bar)

0.8 psig

(0,05 bar)

2.05 psig

(0,14 bar)

1.92 psig

(0,13 bar)

5.0 psig

(0,34 bar)

5.0 psig

(0,34 bar)

SPRING

PART NUMBER

0N039427222 Unpainted 0.062 (1,6) 3.06 (77)

0N086127022 Unpainted 0.125 (3,2) 2.50 (63)

0N004327022 Yellow 0.172 (4,4) 2.50 (63)

1D1418227012 Dark blue 0.207 (5,3) 2.50 (63)

4-inches w.c.

(10 mbar)

3-inches w.c.

(7,5 mbar)

1 psig

(0,07 bar)

0.95 psig

(0,07 bar)

2.1 psig

(0,14 bar)

2.1 psig

(0,14 bar)

5.0 psig

(0,34 bar)

5.0 psig

(0,34 bar)

SPRING COLOR

3.5-inches w.c.
(8,7 mbar)

1.5-inches w.c.
(3,7 mbar)

1 psig

(0,07 bar)

0.9 psig

(0,06 bar)

2.1 psig

(0,14 bar)

2.05 psig

(0,14 bar)

5.0 psig

(0,34 bar)

5.0 psig

(0,34 bar)

3-inches w.c.

(7,5 mbar)

0-inches w.c.

(0 mbar)

(0,07 bar)

0.85 psig
(0,06 bar)

(0,14 bar)

1.98 psig
(0,14 bar)

(0,34 bar)

(0,34 bar)

SPRING FREE

LENGTH

INCHES (mm)

2-inches w.c.

(5 mbar)

0-inches w.c.

(0 mbar)

0.92 psig

(0,06 bar)

0.75 psig

(0,05 bar)

2.0 psig

(0,14 bar)

1.86 psig

(0,13 bar)

5.0 psig

(0,34 bar)

5.0 psig

(0,34 bar)

4

Table 6. Type Y690VB Capacities

Bulletin 71.3:Y690VB

SPRING RANGE,

PART NUMBER, AND COLOR

0 to 4-inches w.c. (0 to 10 mbar)

0N039427222 Unpainted

0 to 1.0 psig (0 to 0,07 bar)

0N086127022 Unpainted

0 to 2.1 psig (0 to 0,14 bar)

0N004327022 Yellow

0 to 5 psig (0 to 0,34 mbar)

1D141827012 Dark blue

1. Spring ranges based on atmospheric inlet pressure.

2. To convert to inches Hg, multiply psig value by 2.04.

(1)

VACUUM

CONTROL SETTING

2-inches w.c. (5 mbar)

0.5 psig (0,03 bar)

2 psig (0,14 bar)

4 psig (0,28 bar)

(2)

ORIFICE SIZE
INCHES (mm)

Principle of Operation

An increase in vacuum (decrease in absolute
pressure) beyond a setpoint registers on the
diaphragm, opening the disk. This permits
atmosphere, positive, or an upstream vacuum that
has higher absolute pressure than the downstream
vacuum, to enter the system and restore the controlled
vacuum to the setpoint. On the Type Y690VB,
the pressure registers internally underneath the
diaphragm. The Type Y690VBM has a control line
connecting the diaphragm casing to the vacuum line
and a throat seal allowing for registration only through
the control line connection.

Installation

CHANGE IN VACUUM

TO WIDE-OPEN

1/4 (6,3) 0.6-inches w.c. (1,5 mbar) 110 (2,95)

1/2 (13) 1.3-inches w.c. (3 mbar) 486 (13,0)

1/4 (6,3) 10-inches w.c. (25 mbar) 293 (7,85)

1/2 (13) 0.7 psig (0,05 bar) 1382 (37,0)

1/4 (6,3) 1.2 psig (0,08 bar) 524 (14,0)

1/2 (13) 2.4 psig (0,17 bar) 2353 (63,1)

1/4 (6,3) 3.2 psig (0,22 bar) 682 (18,3)

1/2 (13) 6.3 psig (0,43 bar) 2910 (78,0)

CAPACITIES IN SCFH

(Nm³/h) OF 1.0 SPECIFIC

GRAVITY AIR

Capacity Information

To determine ow capacities for the Y690VB Series

vacuum breakers, use the following formula:

3415

Q = P

SIN

1abs Cg

C

where,

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

= absolute inlet pressure in psia

1abs

(P1 gauge + 14.7)
Cg = ow coefcient (from Table 3)
C1 = 35

P = pressure drop across vacuum breaker

P

deg

P

1

1abs

A Y690VB Series regulator may be installed in any

orientation as long as ow through it matches the

direction of the arrow on the body. Normal installation
is with the spring case vertical above or below the
diaphragm case. When exposed to the weather, the
vent should be protected by the optional umbrella
vent or pointed down to allow condensate to drain. If
used in hazardous gas service on indoor installations,
this connection should be piped outdoors. External
dimensions and connections are shown in Figure 3.

Note

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 (457 mm).

Note

If the actual change in (control) pressure
(from the service conditions) is less than
the minimum change in (control) pressure
required to fully open the vacuum breaker
(Table 6), the Cg in the formula must
be reduced accordingly. To obtain the
correct reduced Cg, multiply the Cg from
Table 2 by the ratio of the actual change in
(control) pressure to the minimum change
in (control) pressure required to fully
open the vacuum breaker.

5

Bulletin 71.3:Y690VB

Conversion Factors

To determine equivalent capacities for natural gas,
propane, butane, or nitrogen, multiply the calculated
capacity by the following appropriate conversion
factor: 1.29 for natural gas, 0.810 for propane, 0.707
for butane, or 1.018 for nitrogen. For gases of other

specic gravities, 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.

Example Problem Using Formula

This example involves a Type Y690VB vacuum breaker
with its outlet connected to a vessel in which the vacuum
must be limited. This breaker has a 1/4-inch (6,4 mm)

orice and a control spring 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 is

desirable to nd the air ow by the time the pump has

increased the vessel vacuum to 9-inches w.c. (22 mbar)

and the breaker has opened more. To nd the air ow

through the breaker under these conditions:

1. Check whether the change in outlet (controlled)
pressure of 5-inches w.c. (12 mbar) is less than the
minimum change in outlet (controlled) pressure
required to fully open the vacuum breaker. Since
the minimum change in outlet (controlled) pressure
required to fully open the vacuum breaker with

a 1/4-inch (6,4 mm) orice and control spring is

0.6-inches w.c. (1,5 mbar) from Table 4, no
reduction in the regulating Cg of 50 (Table 2) need
be made.

2. Solve the problem by using the appropriate
values in the formula as follows, remembering
that the
9-inches w.c. (0.325 psig) (22 mbar):

=184 SCFH (4,93 Nm³/h) of Air

P across the vacuum breaker is

Q = 14.7(50) SIN DEG

3415350.325

14.7

Ordering Information

When ordering, specify:

Application

1. Composition and specic gravity of gas (including

chemical analysis if possible)

2. Range of temperatures, owing inlet pressures

(maximum, minimum, nominal), and
pressure drops

3. Desired pressure setting or range

4. Range of 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 type number and the spring
case orientation.

6

1/4 NPT VENT

Bulletin 71.3:Y690VB

B2673

BODY SIZE,

NPS (DN)

3/4 (20),

1 (25)

NPT SWE

1/2 NPT
CONTROL LINE
CONNECTION

8.38

(213)

D

f G

DIMENSIONS, INCHES (mm)

A b D f G

Ductile

Iron NPT

Stainless

Steel NPT

Ductile

Iron

Stainless

Steel

Ductile

Iron

Stainless

Steel

4.00 (102) 4.12 (105) 2.12 (54) 2.25 (57) 6.18 (157) 6.18 (157)

6.04

(153)

b

A

Ductile

Iron

10.37
(263)

Stainless

Steel

10.37
(263)

14

(356)

INCHES

(mm)

Ductile

Iron

Stainless

Steel

1.53 (39) 1.53 (39)

Figure 3. Dimensions

7

Bulletin 71.3:Y690VB

Industrial Regulators

Emerson Process Management
Regulator Technologies, Inc.

USA - Headquarters
McKinney, Texas 75069-1872 USA
Tel: [phone]
Outside U.S. 1-972-548-3574

Asia-Pacic

Shanghai, China 201206
Tel: [phone]

Europe
Bologna, Italy 40013
Tel: [phone]

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Dubai, United Arab Emirates
Tel: [phone]

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business of Emerson Process Management.

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products at any time without notice.

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Process Management product remains solely with the purchaser.

Natural Gas Technologies

Emerson Process Management
Regulator Technologies, Inc.

USA - Headquarters
McKinney, Texas 75069-1872 USA
Tel: [phone]
Outside U.S. 1-972-548-3574

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Tel: [phone]

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Bologna, Italy 40013
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