Emerson Y695VR Data Sheet

Bulletin 71.3:Y695VR
Y695VR Series Vacuum Regulator
W7295
January 2009
Figure 1. Type Y695VR Vacuum Regulator
Introduction
The Y695VR Series direct-operated vacuum regulators are used where a decrease in vacuum must be limited, such as between a tank and vacuum source to control vacuum in tank. The Type Y695VR has internal pressure registration. The Type Y695VRM has a control line connection and blocked throat for external pressure registration.
  •   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.
  •   Precision Control of Low Pressure Settings— Large diaphragm areas provide more accurate control at low pressure settings.
  •   Easy Conversion—The Y695VR Series Vacuum
Regulators are easily adapted between external and internal registration.
  •   Common Spare Parts—The Type Y695VR and Type Y695VRM share common spare parts with the other Y690A Series products.
  •   Corrosion Resistance—Constructions are available in a variety of materials for compatibility with corrosive process gases.
www.emersonprocess.com/regulators
D102597X012
Bulletin 71.3:Y695VR
Specications
Available Congurations
Type Y695VR: Direct-operated vacuum regulator Type Y695VRM: Direct-operated vacuum regulator
with blocked throat for external pressure registration
Body Sizes and End Connection Styles
BODY SIZE,
INCHES (DN)
3/4 or 1 (20 or 25) NPT
  1.  Weld-on ange dimension is 14-inches (356 mm) face-to-face.
Maximum (Casing) Pressure
END CONNECTION STYLES
Ductile Iron Steel or Stainless Steel
(2)
(1)
NPT, SWE,
or CL150 RF
Full Vacuum
Maximum Downstream Pressure
(2)
Full Vacuum
Change in Control Pressure to Wide-open
(2)
See Table 2
Pressure Registration Type Y695VR: Internal Type Y695VRM: External
Orice Size 7/16-inch (11 mm)
Capacities See Table 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.
Flow Coefcients
Cg: 120 Cv: 3.43 C1: 35
Material Temperature Capabilities
Nitrile (NBR): -20° to 180°F (-29° to 82°C) Fluorocarbon (FKM): 40° to 300°F (4° to 149°C) Peruoroelastomer (FFKM):
-20° to 300°F (-29° to 149°C)
Spring Case Connection 1/4-inch NPT
Diaphragm Case Connection 1/2-inch NPT
Construction Materials See Table 1
Pressure Setting Adjustment Adjusting nut
Additional Options Umbrella vent assembly for spring case connection
Approximate Weight 19 pounds (9 kg)
(2)
BODY SPRING CASE DIAPHRAGM CASE TRIM DIAPHRAGM DISK
Ductile iron, CF8M Stainless
steel, or Hastelloy® C
SPRING RANGE,
PART NUMBER,
AND COLOR
0 to 4-inches w.c.
(0 to 10 mbar) 0N039427222
Unpainted
0.05 to 0.75 psig
(0,003 to 0,05 bar)
0N086027022
Unpainted
0.15 to 1.75 psig
(0,01 to 0,12 bar)
0N086127022
Unpainted
0.25 to 2.75 psig
(0,02 to 0,19 bar)
0N022027022
Dark green
1.5 to 4.75 psig
(0,10 to 0,33 bar)
0N004327022
Yellow
3.0 to 12.8 psig
(0,21 to 0,88 bar)
1D141827012
Dark blue
SPRING WIRE
DIAMETER
0.062-inches (1,57 mm)
0.105-inches
(2,67 mm)
0.125-inches (3,18 mm)
0.135-inches (3,43 mm)
0.172-inches (4,37 mm)
0.207-inches (5,26 mm)
Ductile iron or
CF8M Stainless steel
MAXIMUM
ALLOWABLE
VACUUM
5.1 psig (0,35 bar)
5.7 psig (0,39 bar)
6.5 psig (0,45 bar)
7.4 psig (0,51 bar)
9.2 psig (0,63 bar)
12.0 psig (0,83 bar)
Table 1. Construction Materials
Ductile iron or
CF8M Stainless steel
316
Stainless steel
Table 2. Y695VR Series Capacities
CONTROL
PRESSURE
SETTING VACUUM
2-inches w.c.
(5 mbar)
0.5 psig
(0,03 bar)
1 psig
(0,07 bar)
2 psig
(0,14 bar)
4 psig
(0,28 bar)
9 psig
(0,62 bar)
OUTLET
VACUUM
7.5 psig
(0,52 bar)
7.5 psig
(0,52 bar)
7.5 psig
(0,52 bar)
7.5 psig
(0,52 bar)
7.5 psig
(0,52 bar)
12 psig
(0,83 bar)
Nitrile (NBR) or
Fluorocarbon (FKM)
CHANGE IN
CONTROL PRESSURE
TO WIDE-OPEN
1-inch w.c. (2 mbar) 1650 (44,2)
5.5-inches w.c. (14 mbar) 1614 (43,3)
0.44 psig (0,03 bar) 1578 (42,3)
0.63 psig (0,04 bar) 1464 (39,2)
1.44 psig (0,10 bar) 1290 (34,6)
3.88 psig (0,27 bar) 1140 (30,6)
Nitrile (NBR) or
Fluorocarbon (FKM)
CAPACITY IN SCFH
(Nm³/h) OF 1.0
SPECIFIC GRAVITY AIR
2
Principle of Operation
B2582
VACUUM BEING
CONTROLLED
HIGHER
VACUUM SOURCE
VACUUM
PUMP
INLET PRESSURE (VACUUM) OUTLET PRESSURE (VACUUM) ATMOSPHERIC PRESSURE (VACUUM)
The Y695VR Series vacuum regulators are used to maintain a constant vacuum at the regulator inlet. A decrease in this vacuum (increase in absolute pressure) beyond this value registers on 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. On the Type Y695VR, pressure registers underneath the diaphragm. The Type Y695VRM has a control line connecting the diaphragm casing to the vacuum line and an O-ring stem seal blocking the throat causing pressure to register through the control line.
Capacity Information
To determine the ow capacities for the Y695VR Series 
vacuum regulators, use the following formula:
Bulletin 71.3:Y695VR
Q = P
1abs Cg
SIN
3415
C
∆P
Deg.
P
1
1abs
where,   Q   = ow capacity in SCFH (60°F and 14.7 psia) of air at 60°F P
= absolute inlet pressure in psia (P1 gauge + 14.7)
1abs
Cg   = ow coefcient (from specications table) C1 = 35
 ∆P  = pressure drop across vacuum breaker 
or regulator
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 regulator (Table 2), the Cg in the formula must be reduced accordingly. To obtain the correct reduced Cg, multiply the Cg from specications table by the ratio of the actual change in (control) pressure to the minimum change in (control) pressure required to fully open the vacuum regulator.
Conversion Factors
To determine equivalent capacities of 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
Figure 2. Type Y695VR Operational Schematic
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 down to allow condensate to drain. On indoor installations, this connection should be piped outdoors if used in hazardous gas service. 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).
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)
3
Bulletin 71.3:Y695VR
6.04
(153)
A
B
8.38
(213)
DIAMETER
D
B2441
BODY SIZE,
INCHES (DN)
3/4, 1 (20, 25) 4.00 (102) 4.12 (105) 2.12 (53,8) 2.25 (57,2) 6.19 (157) 6.19 (157) 10.38 (264) 10.38 (264) 1.69 (42,9) 1.69 (42,9)
Ductile
Iron NPT
A B D F G
Stainless
Steel NPT
F
NPT FLANGED
Ductile
Iron
Stainless
Steel
G
DIMENSIONS, INCHES (mm)
Ductile
Iron
Stainless
Steel
Ductile
Iron
Stainless
Steel
14
(356)
Ductile
Iron
INCHES
(mm)
Stainless
Steel
Figure 3. Y695VR Series Dimensions
Construction
Refer to the Specications section and to each 
referenced table; specify the desired selection
Industrial Regulators
Natural Gas Technologies
whenever there is a choice to be made. Always be sure to specify the type number and the spring case connection location from Figure 3.
TESCOM
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-Pacic
Shanghai, China 201206 Tel: +86 21 2892 9000
Europe Bologna, Italy 40013 Tel: +39 051 4190611
Middle East and Africa Dubai, United Arab Emirates
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-Pacic
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
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
Tel: +971 4811 8100
For further information visit www.emersonprocess.com/regulators
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