Emerson SR8 Data Sheet
Bulletin 71.4:SR8
Type SR8 Sanitary Backpressure Regulator
May 2010
Sanitary Design Standards
Wide Control Range
Superior Flow Performance and Accuracy
Diaphragm Cycle Life
Highly Stable Large Turndown Ratio
Easy Maintenance Tight Shutoff
Covered Adjusting Screw
W8967
Figure 1. Type SR8 Sanitary Backpressure Regulator
Optional T-Handle Available
Nonporous Polished Body and Internals
www.sherregulators.com
Self-Draining
Remote Setpoint Capability
Optional Diaphragm Support
D103106X012
Bulletin 71.4:SR8
Features
• Nonporous Polished Body and Internals for
High Purity Processing—Body, plug, and
diaphragm plate (when applicable) are machined
from 316L Stainless steel. All internal wetted
surfaces are mechanically polished and
electropolished to 20 µin (0,5 µm) Ra.
• Wide Control Range—Typical setpoints range
from 2 to 125 psig (0,14 to 8,6 bar) to cover a wide
range of applications.
• Self-Draining—Fluids will drain toward the outlet of
the body when the regulator is installed with the
spring case in the upright vertical position.
• Tight Shutoff—Soft seat is available to ensure
better shutoff.
• Superior Flow Performance and Accuracy—The
Type SR8 is designed to deliver high ows with
minimal buildup to maintain an even pressure over
the full range of ow.
• Sanitary Design Standards—Designed to meet
3A®, ASME BPE, and European Hygienic
Equipment Design Group criteria.
• Highly Stable—The upper guide ring provides for
stable control over entire operating range.
• Easy Maintenance—The design incorporates
a metal-to-metal stop to protect diaphragms
from damage due to over compression at outer
circumference. Tri-Clamp® allows easy access to
internal parts.
• Large Turndown Ratio—No need for reduced C
trims at low ows.
• Optional Diaphragm Support—A diaphragm
support is added to the regulator for installations
that will be exposed to vacuum conditions.
• Covered Adjusting Screw—Electropolished
stainless steel adjusting screw cover improves the
aesthetics and cleanability of the regulator.
• Diaphragm Cycle Life—Metal 316L Stainless
steel diaphragm is designed to maximize service life.
• Optional T-Handle Available—T-Handle option
available to accommodate frequent adjustments.
• Remote Setpoint Capability—An optional spring
case conguration permits pressure loading.
Loading pressure varied from a remote location
adjusts the setpoint in direct proportion.
v
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Figure 2. Type SR8 Operational Schematic
Introduction
The Type SR8 backpressure regulator is a compact,
large capacity, direct-operated backpressure
regulator. It is designed for use in applications where
a sanitary design is essential, such as pharmaceutical,
biotechnology, or food and beverage industries. The
unit is available in NPS 1/2 through 3 (DN 15 through
80) sizes with end connections that will match up to
Tri-Clamp® sanitary ttings. The Type SR8 is suitable
for use in steam, liquid, or gas service.
Principle of Operation
The Type SR8 is a direct-operated regulator. Pressure
in the controlled system (regulator inlet pressure)
registers beneath the diaphragm of the regulator and
opposes the force provided by the predetermined
spring compression. When regulator spring force
exceeds diaphragm force exerted by the inlet
pressure, the spring will keep the valve plug closed
to prevent ow to the downstream system. As inlet
pressure increases above setpoint, this increase
registers on the diaphragm and the valve plug opens
to allow ow to the downstream system.
Tri-Clamp® is a mark owned by Tri-Clover, Incorporated.
3-A® is a mark owned by 3-A Sanitary Standards, Incorporated.
2
Specications
Bulletin 71.4:SR8
Body Size, Inlet and Outlet Connection
NPS 1/2, 3/4, 1, 1-1/2, 2 and 3 (DN 15, 20, 25,
40, 50 and 80)
Service Media
All Sizes: Steam, Gas, and Liquid
End Connection
Tri-Clamp® Sanitary connections
Body Pressure/Temperature Ratings
MAXIMUM
TEMPERATURE,
°F (°C)
150 (65) 210 (14,5) 210 (14,5)
275 (135) 180 (12,4) 180 (12,4)
400 (204) 160 (11,0) 160 (11,0)
MAXIMUM INLET
PRESSURE,
PSIG (bar)
Maximum Operating Pressures
BODY SIZE,
NPS (DN)
1/2 through
1-1/2
(DN 15
through 40)
2 and 3
(DN 50
and 80)
MAXIMUM
TEMP, °F (°C)
150 (65) 210 (14,5) 210 (14,5)
275 (135) 180 (12,4) 180 (12,4)
400 (204) 160 (11,0) 160 (11,0)
150 (65) 150 (10,3) 150 (10,3)
275 (135) 125 (8,6) 125 (8,6)
400 (204) 110 (7,6) 110 (7,6)
(5)
(1)
MAXIMUM OUTLET
PRESSURE,
(1)(3)
MAX INLET
PRESSURE,
PSIG (bar)
Set Pressure Ranges
See Table 1
Maximum Differential Pressures
(1)
See Table 1
Temperature Capabilities
(1)
See Table 2
Flow Coefcients
See Table 4
Construction Materials
See Table 3
Pressure Registration
Internal
PSIG (bar)
MAX OUTLET
PRESSURE,
PSIG (bar)
Pressure Loaded Spring Case Option
Maximum Loading Pressure
NPS 1/2 through 1-1/2 (DN 15 to 40) body:
125 psig (8,6 bar)
NPS 2 and 3 (DN 50 and 80) body:
60 psig (4,1 bar)
1/4 NPT Tapped Vent Connection
Vacuum Protection Option
Maximum Vacuum Pressure
14 psig (1,0 bar) (vacuum)
Certications Available Upon Request
3A® certicate (Ethylenepropylene (EPDM) and
316L Stainless steel diaphragms only)
FDA approved elastomers/plastics
Material and Functional Test Certicates
USP Class VI approved elastomers/plastics
Spring Case Construction
Drilled untapped vent holes (standard)
1/4 NPT for Pressure Load Connection (optional)
Pressure Setting Adjustment
Adjusting screw with Electropolished
Cover (standard)
T-Handle adjusting screw (optional)
Shutoff Classication per ANSI/FCI 70-3-2003
Metal Seat: ANSI Class III
Polytetrauoroethylene (PTFE) Soft Seat:
ANSI Class VI
Polyetheretherketone (PEEK) Soft Seat:
ANSI Class VI (150-400°F)
(4)
Approximate Weight
NPS 1/2 and 3/4 (DN 15 and 20):
9 pounds (4 kg)
NPS 1 and 1-1/2 (DN 25 and 40):
18 pounds (8 kg)
NPS 2 and 3 (DN 50 and 80):
60 pounds (27 kg)
Options
Vacuum protection
Pressure Loaded spring case
T-handle adjusting screw
(2)
1. The pressure/temperature limits in this bulletin and any applicable standard or code limitation should not be exceeded.
2. Contact your Local Sales Ofce for details on available constructions.
3. Maximum pressure to prevent damage to internal parts and leakage to atmosphere.
4. Polyetheretherketone (PEEK) Seat meets ANSI Class IV or better below 150°F (66°C).
5. End connection clamps and gaskets to be supplied by the user.
Tri-Clamp® is a mark owned by Tri-Clover, Incorporated.
3-A® is a mark owned by 3-A Sanitary Standards, Incorporated.
3
Bulletin 71.4:SR8
Table 1. Set Pressure Ranges, Control Spring Data, and Maximum Differential Pressures
BODY SIZE,
NPS (DN)
1/2 and 3/4
(15 and 20)
1 and 1-1/2 (25 and 40)
full port
1-1/2 x 1 (40 x 25)
2 and 3
(50 and 80)
1. The 2 to 8 psig (0,14 to 0,55 bar) spring is not available with the metal diaphragm.
Table 2. Temperature Capabilities
SEAT TYPE DIAPHRAGM MATERIAL O-RING MATERIAL TEMPERATURE RANGE, °F (°C)
Metal (316L)
(PTFE/316L)
(Polyetheretherketone (PEEK)/316L)
1. O-ring material is PTFE for the NPS 1/2 and 3/4 (DN 15 and 20) sizes. Temperature range is the same.
SET PRESSURE RANGES,
2 to 8 (0,14 to 0,55)
5 to 25 (0,34 to 1,7) 40 (2,7) Silver GE06781X012 0.177 (4,50) 2.75 (69,9)
10 to 50 (0,69 to 3,4) 100 (6,9) Green GE06782X012 0.192 (4,88) 2.75 (69,9)
35 to 100 (2,4 to 6,9) 140 (9,6) Red GE06783X012 0.225 (5,72) 2.75 (69,9)
75 to 125 (5,2 to 8,6) 160 (11,0)
2 to 8 (0,2 to 0,5)
5 to 25 (0,4 to 1,7) 40 (2,7) Silver GE02764X012 0.282 (7,16) 3.25 (82,6)
15 to 70 (1,0 to 4,8) 100 (6,9) Green GE02765X012 0.331 (8,41) 3.25 (82,6)
25 to 90 (1,7 to 6,2) 125 (8,6) Red GE02766X012 0.362 (9,19) 3.25 (82,6)
35 to 100 (2,4 to 6,9) 140 (9,6)
75 to 125 (5,2 to 8,6) 160 (11,0)
10 to 25 (0,7 to 1,7) 50 (3,4) Silver GE14003X012 0.562 (14,3) 6.00 (152)
15 to 50 (1,0 to 3,4) 75 (5,2) Green GE14004X012 0.625 (15,9) 6.00 (152)
25 to 60 (1,7 to 4,1) 75 (5,2) Red GE14005X012 0.625 (15,9) 6.00 (152)
Soft
Soft
PSIG (bar)
MAXIMUM DIFFERENTIAL
PRESSURE, PSID (bar d)
(1)
(1)
Ethylenepropylene (EPDM) Ethylenepropylene (EPDM) - 20 to 275 ( -28 to 135)
316L Stainless Steel PTFE/Fluorocarbon (FKM)
PTFE/Fluorocarbon (FKM) PTFE/Fluorocarbon (FKM) 20 to 400 ( -6 to 204)
Ethylenepropylene (EPDM) Ethylenepropylene (EPDM) - 20 to 150 ( -28 to 65)
316L Stainless Steel PTFE/Fluorocarbon (FKM)
PTFE/Fluorocarbon (FKM) PTFE/Fluorocarbon (FKM) 20 to 150 ( -6 to 65)
Ethylenepropylene (EPDM) Ethylenepropylene (EPDM) -20 to 275 (-28 to 135)
316L Stainless Steel PTFE/Fluorocarbon (FKM)
PTFE/Fluorocarbon (FKM) PTFE/Fluorocarbon (FKM) 20 to 400 ( -6 to 204)
15 (1,0) Blue GE06780X012 0.138 (3,51) 2.75 (69,9)
15 (1,0) Blue GE02763X012 0.225 (5,72) 3.25 (82,6)
COLOR
CODE
Red/
Yellow
Green/
Yellow
Red/
Yellow
PART NUMBER
GE06783X012/
GE06784X012
GE02765X012/
GE06090X012
GE02766X012/
GE06090X012
WIRE DIAMETER,
(1)
(1)
(1)
INCH (mm)
0.225 (5,72)/
0.148 (3,76)
0.331 (8,41)
0.250 (6,35)
0.362 (9,19)/
0.250 (6,35)
20 to 400 ( -6 to 204)
20 to 150 ( -6 to 65)
20 to 400 ( -6 to 204)
FREE LENGTH,
INCH (mm)
2.75 (69,9)/
2.75 (69,9)
3.25 (82,6)
3.25 (82,6)
3.25 (82,6)/
3.25 (82,6)
Table 3. Construction Materials
PART MATERIAL
Body 316L Stainless steel, 20 µin (0,5 µm) Ra with Electropolish
Spring Case 316 Stainless steel with Electropolish
Plug and Diaphragm Plate 316L Stainless steel, 20 µin (0,5 µm) Ra with Electropolish
Soft Seat Virgin PTFE or Polyetheretherketone (PEEK)
Diaphragm Ethylenepropylene (EPDM)(FDA), Virgin PTFE coated Fluorocarbon (FKM), or 316L Stainless steel
Control Springs Inconel® or 302 Stainless steel
Guide Ring and Upper and lower spring seats 300 Series Stainless steel
Adjusting Screw and locknut 300 Series Stainless steel
Closing Cap 300 Series Stainless steel with Electropolish or Plastic
T-handle and Locking Lever 300 Series Stainless steel
O-rings Ethylenepropylene (EPDM) (FDA), Virgin PTFE encapsulated Fluorocarbon (FKM), or Virgin PTFE
Piston Ring Expanded PTFE with 302 Stainless steel
Gaskets (Stainelss steel diaphragm only) Virgin PTFE
Bolted Clamp 304 Stainless steel with Brass or Stainless steel Nuts
Bead Chain and Ring Grip 300 Series Stainless steel
Inconel® is a mark owned by Special Metals Corporation.
4
Table 4. Flow Coefcients
Bulletin 71.4:SR8
SIZE, NPS (DN)
1/2 (15) 27 1.4 1.3 19.1 0.54 0.73 0.23 0.40
3/4 (20) 70 3.1 3.5 22.8 0.61 0.78 0.33 0.41
1 (25) 202 7.2 10.1 28.1 0.63 0.79 0.50 0.42
1-1/2 x 1 (40 x 25) 216 7.6 10.8 28.4 0.60 0.77 0.51 0.42
1-1/2 (40) full port 309 10.9 15.5 28.4 0.68 0.82 0.51 0.40
2 (50) 962 34.4 48 28.0 0.60 0.78 0.49 0.32
3 (80) 1114 40.3 56 27.6 0.44 0.67 0.48 0.36
WIDE OPEN COEFFECIENTS
C
g
C
v
C
C
s
1
K
m
F
L
X
T
Capacity Data
The capacity information on the following pages is
based on four buildup factors, 10, 20, 30, and 40
percent. Buildup is the increase above setpoint required
to open and is usually stated in percentage of setpoint
value. Flow at setpoint (set ow) is approximately
10% of maximum ow. Greater capacities are
obtained with higher buildups over the relief pressure
setting, as shown in the capacity tables. To evaluate
the performance of a regulator, compare the stated
capacities at equivalent operating pressures and buildup
factors. Comparing the wide open Cv does not consider
the overall accuracy.
Buildup is derived by applying the applicable percentage
buildup to the setpoint. Buildup of 10 percent on a
20 psig (1,4 bar) setpoint would be 2 psig (0,14 bar) for a
total pressure of 22 psig (1,5 bar). Capacity information
assumes full drop. For instances where full drop is not
applicable, it is easiest to use the Fisher® Sizing program
and the Cv values listed in Table 5.
For the most accurate control, use the lowest range
spring that can be adjusted to the desired setpoint
(see Table 1 for part numbers of appropriate springs
for each body size). If closer control is necessary,
a regulator of larger capacity should be selected, so
that the necessary ow can be obtained with a smaller
offset factor.
It may be necessary to interpolate the capacity table
data to determine capacity for settings not given. To
maintain accuracy, it is important when interpolating to
stay within a spring range if possible.
An alternative method for interpolating capacities is
to use the Cv as shown in Table 5 in the Fisher Sizing
Program. When using this method remember that
P1 pressure is the sum of the setpoint and applicable
buildup. Do not use the wide open coefcients shown
in Table 4 for interpolating capacities.
Contact your nearest local Sales Ofce if you should
have any questions about selecting the proper regulator.
Regulating capacities in Table 6 are shown in SCFH
(60°F and 14.7 psia) of air at 60°F and normal cubic
meters per hour at 0°C and 1.01325 bar. For gases of
other specic gravities, divide by the square root of the
appropriate specic gravity.
Capacities in Table 7 are in pounds per hour and
kilograms per hour of saturated steam.
All water capacities in Tables 8 are shown in gallons
per minute and liters per minute. The Km values
listed in Table 4 can be used to predict choked ow
on liquid service.
Installation
The Type SR8 regulator may be installed in any
position, as long as ow will be in the same direction as
that indicated by the body arrow. However, to ensure
self-draining (from inlet to outlet) the regulator should
be installed with the spring case in the upright vertical
position. The regulator should be installed so that the
spring case vent is protected from anything that might
interfere with it.
Emerson Process Management Regulator Technologies,
Inc. provides an instruction manual with every regulator
shipped. Refer to this for complete installation,
operation and maintenance instructions. Included is a
complete listing of individual parts and recommended
spare parts.
F
d
5
Bulletin 71.4:SR8
Table 5. Cv Coefcients
CV AT % BUILD-UP
SPRING
RANGE,
PSIG (bar)
2 to 8
(0,14 to 0,55)
5 to 25
(0,34 to 1,7)
10 to 50
(0,69 to 3,4)
35 to 100
(2,4 to 6,9)
75 to 125
(5,2 to 8,6)
Shaded areas indicate conditions where maximum differential pressure for the spring range is exceeded.
SET
PRESSURE,
PSIG (bar)
10% 20% 30% 40% 10% 20% 30% 40%
2 (0,14) 0.45 0.55 0.65 0.75
5 (0,34) 0.45 0.67 0.84 0.99
8 (0,55) 0.50 0.80 1.03 1.22
5 (0,34) 0.35 0.49 0.62 0.80 0.32 0.36 0.40 0.47
15 (1,0) 0.59 0.94 1.13 1.26 0.40 0.55 0.67 0.81
25 (1,7) 0.71 1.15 1.36 1.40 0.44 0.64 0.78 0.96
10 (0,69) 0.40 0.65 0.87 1.10 0.35 0.42 0.50 0.57
15 (1,0) 0.54 0.87 1.04 1.21 0.38 0.49 0.62 0.74
30 (2,1) 0.76 1.22 1.30 1.37 0.43 0.59 0.82 0.98
45 (3,1) 0.86 1.39 1.40 1.40 0.45 0.64 0.91 1.09
50 (3,4) 0.89 1.40 1.40 1.40 0.45 0.66 0.93 1.12
35 (2,4) 0.60 0.95 1.24 1.40 0.42 0.60 0.75 0.94
50 (3,4) 0.69 1.10 1.35 1.40 0.46 0.69 0.89 1.11
75 (5,2) 0.77 1.23 1.40 1.40 0.50 0.77 1.02 1.27
100 (6,9) 0.82 1.30 1.40 1.40 0.53 0.82 1.09 1.36
75 (5,2) 1.16 1.40 1.40 1.40 1.12 1.40 1.40 1.40
100 (6,9) 1.13 1.40 1.40 1.40 1.10 1.40 1.40 1.40
125 (8,6) 1.23 1.36 1.39 1.02 1.40 1.40
Elastomer Diaphragm Metal Diaphragm
NPS 1/2 (DN 15) NPS 1/2 (DN 15)
Not Available
Table 5. Cv Coefcients (continued)
SPRING
RANGE,
PSIG (bar)
2 to 8
(0,14 to 0,55)
5 to 25
(0,34 to 1,7)
10 to 50
(0,69 to 3,4)
35 to 100
(2,4 to 6,9)
75 to 125
(5,2 to 8,6)
Shaded areas indicate conditions where maximum differential pressure for the spring range is exceeded.
SET
PRESSURE,
PSIG (bar)
10% 20% 30% 40% 10% 20% 30% 40%
2 (0,14) 0.58 0.67 0.90 1.07
8 (0,55) 1.04 1.94 2.96 3.10
5 (0,34) 0.60 0.87 1.16 1.44 0.51 0.56 0.64 0.75
15 (1,0) 1.04 2.10 2.69 2.82 0.56 0.70 0.86 1.03
25 (1,7) 1.26 2.67 3.10 3.10 0.59 0.76 0.95 1.15
10 (0,69)
15 (1,0) 0.80 1.35 1.70 2.11 0.51 0.65 0.78 0.93
30 (2,1) 1.09 2.02 2.34 2.72 0.59 0.80 1.02 1.23
45 (3,1) 1.23 2.34 2.64 3.00 0.62 0.87 1.13 1.37
50 (3,4) 1.26 2.41 2.70 3.06 0.63 0.88 1.16 1.40
35 (2,4) 0.91 1.83 2.71 3.10 0.56 0.73 0.89 1.06
50 (3,4) 1.34 2.36 3.00 3.10 0.62 0.83 1.09 1.35
75 (5,2) 1.72 2.83 3.10 3.10 0.67 0.93 1.27 1.59
100 (6,9) 1.94 3.10 3.10 3.10 0.70 0.98 1.36 1.73
75 (5,2) 1.66 2.80 3.04 3.10 1.01 1.58 1.92 2.10
100 (6,9) 1.96 3.10 3.10 3.10 1.01 1.33 1.85 2.21
125 (8,6) 2.21 3.10 3.10 1.01 1.47 1.96
0.62 0.92 1.28 1.70 0.47 0.55 0.62 0.73
Elastomer Diaphragm Metal Diaphragm
NPS 3/4 (DN 20) NPS 3/4 (DN 20)
CV AT % BUILD-UP
Not Available5 (0,34) 0.82 1.38 2.08 2.27
6
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