Data Sheet

Bulletin 71.1:CP400
10
size to the vent, and the end of the vent pipe must be
protected from anything that might clog it. Regulators
with External Registration require the use of an
external control line.
Vent and Body orientation is shown in Figure 7.
Dimensions are shown in Figure 8.
Overpressure Protection
The CP400 Series regulators have outlet pressure
ratings that are lower than their inlet pressure ratings.
A pressure relieving or pressure limiting device is
needed for Types CP400IN, CP400EN, CP400IT
and CP400ET if inlet pressure can exceed the outlet
pressure rating as these regulators do not have
standard internal relief, high outlet pressure shutoff or
integral slam-shut module.
Token Relief
Types with a “T” in the type number, e.g.,
Type CP400IT provide an optional small capacity or
token relief located in the Type 67CPR to relieve minor
overpressure caused by thermal expansion or minor
nicks in the orice or disk.
Integral True-Monitor Protection
Types CP403IN, CP403EN, CP403IT and CP403ET
combine the operation of a conventional two-regulator
wide-open monitor set into one body. The Integral
True-Monitor is installed on the inlet side of the body
and serves to throttle ow and maintain an acceptable
downstream pressure in the case where the primary
regulator fails to regulate. Unlike multiple seat designs
that rely on the primary regulator for all failure
modes, the Type CP403 provides protection from a
wide variety of failures that could cause the primary
regulator not to regulate downstream pressure.
Table 10 shows a comparison between the Integral
True-Monitor protection and the protection offered by
an additional seat.
Pressure Registration
The Integral True-Monitor has the options for internal
pressure registration and external registration, denoted
by the “I” and “E” in the type number, respectively.
The method of pressure registration is dependent on
the registration of the primary regulator, see Table 1.
For example, if the primary regulator’s registration
is internal, then the wide-open monitor regulator’s
registration should either be internal or external. If the
primary regulator’s registration is external, then the
wide-open monitor regulator’s pressure registration
must be external.
Token Relief
An optional token relief may be installed on the primary
regulator of the Type CP403, denoted by the “T” in the
type number, for example, Type CP403IT. The token
CP403 SERIES TRUE-MONITOR™ PROTECTION ADDITIONAL SEAT PROTECTION
Damage/nick on seat X X
Damage to disk X X
Damage or disconnected lever X - - - -
Damage to diaphragm X - - - -
Blocked or broken registration to
Primary regulator
(1)
X - - - -
1. For external pressure registered units, in order to gain True-Monitor Protection in the case of damaged or broken sense line, it is required that the Primary and Integral Wide-Open
Monitor do not share downstream sense lines.
Table 10. Type CP403 Overpressure Protection Benets vs. Additional Seat Protection
SETPOINT
(1)
SPRING COLOR
SPRING PART
NUMBER
START-TO-DISCHARGE PRESSURE
RANGE ABOVE SETPOINT
psig bar psig mbar
1 to 2 0.07 to 0.14 Yellow Stripe GE30199X012 1 to 3.5 69 to 241
2 to 5 0.14 to 0.34 Orange Stripe GE27213X012 1.75 to 5.5 121 to 379
5 to 10 0.34 to 0.69 Black Stripe GE39890X012 2.5 to 6.75 172 to 465
1. Outlet pressure range is controlled by 67CP Series pressure loading regulator spring. Only the 1 to 2, 2 to 5 and 5 to 10 psig / 0.07 to 0.14, 0.14 to 0.34 and 0.34 to 0.69 bar spring
ranges are available with Token Relief.
Table 11. Token Relief Valve Start-to-Discharge Pressure Above Setpoint