Data Sheet

Bulletin 71.4:SR8
2
Figure 2. Type SR8 Operational Schematic
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
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
v
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 conguration permits pressure loading.
Loading pressure varied from a remote location
adjusts the setpoint in direct proportion.
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.