CS200 Series
5
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Figure 3.
CS200 Series with Secondary Seat Protection
4
CP200 Series with Secondary Seat
TM
Protection
CONTROL SPRING
RELIEF V LVE STEM
VALVE STEM
SECONDARY SEAT DETAIL
SECONDARY SEAT™ DETAILED VIEW
NORMAL OPERATION
NORMAL LOCKUP
DEBRIS OBSTRUCTING
LOCKUP
SECONDARY SEAT
LOCKUP
TYPE CS206
SECONDARY SEAT WITH
METAL TO METAL BLEED
METALLIC SECONDARY
ORIFICE SEATING SURFACE
PRIMARY DISK
SECONDARY SEATING
SURFACE
PRIMARY ORIFICE
SEATING SURFACE
ELASTOMERIC SECONDARY
SEATING SURFACE
Type CS206 Secondary Seat Protection
with Bleed
The Type CS206 provides small bleed to the downstream
system as an indication that the Secondary Seat is
providing lockup. In the event that the primary orifice
and disk cannot provide lockup, the secondary seating
surface will move into contact with a metal disk. This
metal to metal interface will allow a small amount of gas
to bleed downstream thereby increasing outlet pressure
until the Internal relief valve begins to discharge gas
to the atmosphere. The odor of this discharged gas
provides an indication that the regulator is relying on
the Secondary Seat for overpressure protection. See
Table 5 for the Downstream Pressure Build-up of the
Internal relief acting in conjunction with the Type CS206
Secondary Seat Assembly.
Types CS205 and CS206 Secondary Seat
Protection Limitations
CAUTION
Overpressure conditions can occur
in the downstream piping when the
Secondary Seat Protection is
installed. The Secondary Seat Protection
serves only as a backup to the primary
seat for lockup. Refer to the sections on
Overpressure Protection and Maintenance.
M1131
ERAA03487
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
RELIEF VALVE STEM
CONTROL SPRING
RELIEF VALVE
SPRING
RELIEF SEAT
PRESSURE RETAINING
PLUG (DO NOT REMOVE)
VALVE STEM
SECONDARY
SEAT DETAIL
