Instruction manual

Type SR8
D103100X012
Instruction Manual
Form 5787
February 2006
R
www.emersonprocess.com/regulators
Type SR8 Sanitary Backpressure Regulator
Introduction
Type SR8 self contained backpressure regulators
are suitable for pressure control of steam, liquid, or
gaseous service. Typical set points range from 2 to
125 psi (0,2 to 8,6 bar). The regulator is designed to
meet sanitary application and material requirements.
Scope of the Manual
This manual provides installation, startup,
maintenance, and parts ordering information for the
Type SR8 Sanitary Backpressure Regulator.
Principle of Operation
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.
Figure 1. Type SR8
W8967
Figure 2. Operational Schematic
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
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