Emerson Y696VR Data Sheet

Bulletin 71.3:Y696VR

Y696VR Series Vacuum Regulator

Introduction

The Y696VR Series are direct-operated vacuum
regulators used where a decrease in vacuum
(increase in absolute pressure) must be limited, such
as between a tank and vacuum source to control
vacuum in the tank. The Type Y696VR has internal
pressure registration. The Type Y696VRM has a
control line connection port and blocked throat for
external pressure registration.

Features

•  Precision Control of Low Pressure Settings—
Large diaphragm areas provide more accurate
control at low pressure settings.

•  Installation Adaptability—Four-position vent
mounting and 360° adjustability of the union

nut connection permit exibility in vent positioning

and installation in awkward positions or
limited spaces.

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

Principle of Operation

A vacuum regulator maintains a constant vacuum at
the regulator inlet. A decrease in vacuum (increase
in absolute pressure) below the setpoint registers
on the diaphragm and opens the disk. This allows
the pressure from the higher vacuum source to pass
through the regulator and restore the vacuum to its
original setting. On the Type Y696VR, the controlled
pressure registers directly into the diaphragm casing.
The Type Y696VRM has a control line connecting the
diaphragm casing to the vacuum being controlled and
an O-ring stem seal blocking the throat allowing for
registration only through the control line connection.

W7431

Figure 1. Type Y696VR Vacuum Regulator

Installation

The versatility of the Y696VR Series devices permits
a wide variety of installations. The body may be
mounted in any position (360° rotation possible) relative
to the spring and diaphragm cases just by loosening
the union nut and rotating the diaphragm case. Spring

case can be rotated to t the application required. Any

mounting position provides excellent performance.
When exposed to the weather, spring case port should
be protected by an optional umbrella vent or pointed
downward to allow drainage. When indoors, pipe this
port outside if used in hazardous gas service.

Downstream piping will vary with the installation. To
obtain the calculated characteristics, piping should be

the same size as the outlet and straight for the rst

18-inches (457 mm).

November 2008

www.emersonprocess.com/regulators

D102664X012

Bulletin 71.3:Y696VR

Specications

Body Sizes and End Connection Styles

See Table 1

Maximum Allowable Emergency Inlet 
(Casing) Pressure

(2)

±15 psig (±1,03 bar)

Maximum Allowable Pressure without Internal 
Parts Damage

(2)

±8 psig (±0,55 bar)

Maximum Downstream Pressure

(2)

Full Vacuum

(1)

Material Temperature Capabilities

Nitrile (NBR): -40° to 180°F (-40° to 82°C)
Fluorocarbon (FKM): 40° to 300°F (4° to 149°C)
Ethyleneproplyene (EPR):

-20° to 200°F (-29° to 93°C)
Peruoroelastomer (FFKM):
0° to 300°F (-18° to 149°C)
Silicone (VMQ): -40° to 400°F (-40° to 204°C)

Construction Materials

Body: Cast iron, WCC steel (NACE), CF8M
Stainless steel (NACE), or Hastelloy C (optional)
Diaphragm Casing: Cast iron, WCC steel (NACE),

Wide-Open Flow Coefcients
Cg: 515; Cv: 14.7; C1: 35

Vacuum Control Pressure Ranges

(1)

See Table 2

Capacities

See Table 3

Spring Case Connection

3/4-inch NPT

Control Line Connection 
1/2-inch NPT

CF8M Stainless steel, or Hastelloy C (optional)
Spring Case: Cast iron, WCC steel, aluminum, or
CF8M Stainless steel
Disk Holder: 302 Stainless steel (standard) or
316 Stainless steel (NACE)
Disk: Nitrile (NBR) or Fluorocarbon (FKM)
(standard); Neoprene (CR), Polytetrauoroethylene

(PTFE), Fluorocarbon (FKM), Peruoroelastomer

(FFKM), or Ethylenepropylene (EPR) (NACE)
Diaphragm: Nitrile (NBR), Fluorocarbon (FKM),
Ethylenepropylene (EPR), or Silicone
Trim: 302 stainless steel (standard), 316 Stainless
steel (NACE), or Hastelloy C (optional)

Gauge Tap Connection

1/4-inch NPT

Pressure Registration

Type Y696VR: Internal
Type Y696VRM: External

O-rings: Nitrile (NBR), Fluorocarbon (FKM),

Peruoroelastomer (FFKM), or

Ethylenepropylene (EPR)

Approximate Weights
Cast Iron: 45 pounds (20,4 kg)
  Steel, Stainless Steel, or Hastelloy C:

57 pounds (25,9 kg)

(2)

1. End connections for other than U.S. standards can usually be provided; consult the local Sales Ofce.

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

Table 1. Body Sizes and End Connection Styles

BODY SIZE, 

INCHES (DN)

1-1/2 (40)

2 (50)

1. All anges are welded on to the body and have a face-to-face dimension of 14-inches (356 mm).

Cast Iron Steel or Stainless Steel Hastelloy C

CONSTRUCTION MATERIAL AND END CONNECTION STYLE

NPT

NPT, SWE, CL150 RF, CL300 RF, or

PN 16/25/40

Table 2. Vacuum Control Pressure Ranges and Spring Part Numbers

VACUUM CONTROL 

PRESSURE RANGE

1 to 3-inches w.c.

1-1/2 to 5-inches w.c.

3 to 8-inches w.c.

8 to 16-inches w.c.

16 to 32-inches w.c.

1. Pressure ranges are based on the spring case pointing up. Pointing the spring case down increases the pressure range 1.7-inches w.c. (4,2 mbar).
(Example: 1 to 3-inches w.c. (2,5 to 7,5 mbar) changes to 2.7 to 4.7-inches w.c. (6,7 to 11,7 mbar).)

2. Do not use Fluorocarbon (FKM) diaphragm with these springs at diaphragm temperatures lower than 40°F (4°C).

2

0.25 to 3 psig

(1)

(2 to 7 mbar)
(4 to 12 mbar)
(7 to 20 mbar)

(20 to 40 mbar)
(40 to 80 mbar)
(17 to 207 mbar)

(2)

(2)

(2)

CHANGE IN VACUUM 

CONTROL PRESSURE TO 

REACH WIDE-OPEN

1.5-inches w.c.
2-inches w.c.
3-inches w.c.

4-inches w.c.
7-inches w.c.

1.2 psig

(4 mbar)
(5 mbar)
(7 mbar)

(10 mbar)
(17 mbar)
(83 mbar)

SPRING PART 

NUMBER

1D892527022
1D7654000A2
0B019727052

1B766627062
1B883327022
1A630627022

SPRING COLOR

Brown

Unpainted

Purple

Gray

Unpainted

Black

(1)

CL150 RF

0.109-inch

0.120-inch

0.148-inch

0.156-inch

0.187-inch

0.275-inch

SPRING WIRE 

DIAMETER

(2,77 mm)
(3,05 mm)
(3,76 mm)

(3,96 mm)
(4,75 mm)
(6,99 mm)

Capacity Information

Bulletin 71.3:Y696VR

To determine ow capacities for the Y696VR Series vacuum

regulators, use the following formula:

Q = P

3415

SIN DEG

1abs Cg

C

P

P

1

1abs

where,

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

= absolute inlet pressure, psia (P1 psig + 14.7)

1abs

Cg = ow coefcient
C1 = 35

P = pressure drop across the vacuum breaker

If the actual change in control pressure (from the service
conditions) is less than the change in vacuum control

pressure required to reach wide-open (Table 2), the Cg in

the formula must be reduced accordingly. To reduce Cg,
multiply Cg (515) by the ratio of the actual change in control

pressure to the change in vacuum control pressure required

to reach wide-open.

Conversion Factors

To determine equivalent capacities of other common gases,

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

specic gravities, divide by the square root of the appropriate
specic gravity.

GAUGE TAP
1/4-INCH NPT

VACUUM BEING 

CONTROLLED

HIGHER VACUUM SOURCE

VACUUM 

PUMP

INLET PRESSURE
OUTLET  PRESSURE
ATMOSPHERIC PRESSURE

Figure 2. Type Y696VR Operational Schematic

5.19

(132)

17.44
(443)

Figure 3. Y696VR Series Dimensions

Table 3. Y696VR Series Capacities

VACUUM CONTROL 
PRESSURE RANGE

1 to 3-inches w.c.

1-1/2 to 5-inches w.c.

3 to 8-inches w.c.

8 to 16-inches w.c.

16 to 32-inches w.c.

0.25 to 3 psig

(2 to 7 mbar)
(4 to 12 mbar)
(7 to 20 mbar)

(20 to 40 mbar)
(40 to 80 mbar)
(17 to 207 mbar)

10.38
(264)

VACUUM CONTROL 

PRESSURE SETTING

3-inches w.c.
5-inches w.c.
8-inches w.c.

16-inches w.c.
24-inches w.c.

2 psig

2.94 (74,7)

2.25

(57,2)

(7 mbar)
(12 mbar)
(20 mbar)

(40 mbar)
(60 mbar)
(138 mbar)

9.68
(246)

14.0

(356)

5.88

(149)

7.00
(178)

CHANGE IN VACUUM 

CONTROL PRESSURE TO 

REACH WIDE-OPEN

1.5-inches w.c.
2-inches w.c.
3-inches w.c.

4-inches w.c.
7-inches w.c.

1.2 psig

(4 mbar)
(5 mbar)
(7 mbar)

(10 mbar)
(17 mbar)
(83 mbar)

12.72
(323)

CAPACITIES IN SCFH 

(Nm3/h) OF AIR

6953
6920
6876

6722
6612
6496

(186)
(185)
(184)

(180)
(177)
(174)

7.06

(179)

DOWNSTREAM 

VACUUM

7 psig (0,48 bar)

vacuum

INCHES

(mm)

3

Bulletin 71.3:Y696VR

Ordering Information

When ordering, specify:

Application

1. Composition and specic gravity of gas

(including chemical analysis if possible)

2. Temperature range

3. Inlet pressures (maximum, minimum, nominal)

4. Pressure drops

5. Desired pressure setting or range

6. Flow rates (minimum, maximum, normal)

7. 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. Be sure to
specify spring case port location from Figure 4.

F

C

E

CJ4598-B

D

Figure 4. Spring Case Port Location

Industrial Regulators

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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Shanghai, China 201206
Tel: [phone]

Europe
Bologna, Italy 40013
Tel: [phone]

Middle East and Africa
Dubai, United Arab Emirates
Tel: [phone]

For further information visit www.emersonprocess.com/regulators

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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

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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

Asia-Pacic

Singapore, Singapore 128461
Tel: [phone]

Europe
Bologna, Italy 40013
Tel: [phone]
Gallardon, France 28320
Tel: [phone]

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