Data Sheet

Bulletin 71.4:LR128
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TYPE MR98H PILOT
TYPE LR128 RELIEF VALVE OR BACKPRESSURE REGULATOR
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TRIM PACKAGE
W7398
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TYPE MR98H PILOT
Figure 2. Type LR128 Features and Bene ts
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Features and Bene ts
Tight Shutoff – The Type LR128 uses a
diaphragm and metal plug, eliminating the
disadvantagesofexibleelementstyleregulators.
Whenopen,themetalplugdeectsparticlesand
debris away from the diaphragm. The result is
enhanced resistance to particle erosion, which
providesexcellentshutoffoveranextendedlife.
When closed, loading pressure and the main
spring push the diaphragm onto the tapered-
edged seat on the cage.
Debris Protection – The specially engineered
owpath,alongwiththemetalplug,allowsow
through the regulator without seat impingement.
The addition of an internal inlet strainer prevents
large particles from entering the regulator,
minimizing damage to internal parts.
High Accuracy – Multiple control pressure ranges
offered by Type MR98H pilot and lower accuracy
class inherent to pilot operated pressure regulator
design provide the Type LR128 with tight and
accurate control.
Long Life – The robust design of the Type LR128
withitsmetalplugandspeciallyengineeredow
pathallowsowthroughtheregulatorwithoutseat
impingement. The diaphragm design eliminates
the possibility of taking a “set”, a common problem
withexibleelementstyleregulators.Toprevent
damage, the diaphragm is fully supported in both
the open and closed positions. These features
enable the Type LR128 components to work
longer with less wear and tear.
Full Usable Capacity – Fisher
®
branded
regulatorsarelaboratorytested.Onehundred
percentofthepublishedowcapacitycanbe
usedwithcondence.
Thorough Laboratory Testing – Emerson
Process Management Regulator Technologies,
Inc.(Emerson™)state-of-the-artowlaboratory
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