Data Sheet

Bulletin 71.1:CS800
4
Figure 2. Internal View of CS800 Series with High Capacity Relief
Introduction
The CS800 Series direct-operated, spring-loaded
regulators have been engineered to  t a multitude
of commercial and industrial pressure-reducing
applications. This  exibility is provided by the
numerous body sizes and end connections, outlet
pressure settings, ori ce sizes, as well as the option
for internal or external pressure registration.
In addition to application  exibility, the CS800 Series
offers multiple overpressure protection options:
Overpressure Protection
Options Available
• Internal Relief – Provides overpressure protection
to the downstream system by relieving gas through
the diaphragm assembly to atmosphere in the
event of an overpressure situation.
• High-Capacity Internal Relief – Provides an
increase in relief performance over internal relief
thereby offering a signi cant improvement in the
level of overpressure protection to the downstream
system in the event of an overpressure occurrence.
RELIEF VALVE SEAT
VENT STABILIZER
VALVE DISK
ORIFICE
DIAPHRAGM ASSEMBLY
ADJUSTING SCREW
LEVER
CONTROL SPRING
VALVE STEM
RELIEF SPRING
P1002
• True-Monitor™ Protection – Combines the
operation of a conventional two-regulator wide-
open monitor set into one body. Provides a second
monitoring regulator to control downstream
pressure. In event of loss of downstream pressure
control by the primary regulator due to damage
to the lever, downstream sense line, ori ce, disk,
diaphragm, etc., the monitoring regulator will
assume control of the downstream pressure and
regulator  ow.
• Secondary Seat™ Protection – Provides a
solution to the most common cause of regulators
failing to shut off by employing a secondary seating
surface to provide shutoff in the event the primary
ori ce seating surface becomes damaged or
blocked. See page 15 for additional information.
• Slam-Shut Protection – Discontinues gas service
by shutting the gas off if there is an overpressure
or underpressure condition.
Overpressure Relief
• Token Relief – Provides overpressure relief via a
small capacity or token relief that relieves minor
overpressure caused by thermal expansion or
minor nicks in the ori ce or disk.