Data Sheet
Bulletin 71.1:CS400
2
Introduction
The CS400 Series direct-operated, spring-loaded regulators have been engineered to t a multitude of pressure-
reducing applications including commercial and industrial installations. This exibility is provided by the numerous
body sizes and end connections, outlet pressure settings, orice sizes, as well as the option for internal or external
pressure registration.
In addition to application exibility, the CS400 Series offers multiple overpressure protection options to meet your
demands on application requirements.
Relieves gas across the main diaphragm assembly to minimize downstream pressure buildup.
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, orice, disk,
diaphragm, etc., the monitoring regulator will assume control of the downstream pressure and regulator ow.
Discontinues gas service by shutting the gas off if there is an overpressure or
underpressure condition.
Provides a small capacity or token relief that relieves minor overpressure caused by thermal
expansion or minor nicks in the orice or disk.
Figure 2. Typical Type CS400 Internal View
STAbILIzER
LOWER
CASING
LEVER
VALVE DISk
VALVE STEM
ORIfICE
DIAPHRAGM HEAD
CONTROL SPRING
ADjUSTING SCREW
RELIEf
VALVE
STEM
RELIEf
VALVE
SEAT
PRESSURE RETAINING
PLUG (DO NOT
REMOVE If UNIT IS
PRESSURIzED)
P1003