Data Sheet

Bulletin 71.1:CP400
5
M1065
Figure 3. Type CP400IN Pressure Loaded Regulator with Internal Pressure Registration Operational Schematic
Type CP400IT Pressure Loaded Regulator with Token Relief
M1082
January 2008
Type CP400IT
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
TYPE 67CP PRESSURE
LOADING REGULATOR
MAIN REGULATOR
EXTERNAL CONTROL LINE PLUG
(DO NOT REMOVE IF UNIT IS
PRESSURIZED)
CONTROL SPRING
CLOSING SPRING
LEVER
VALVE DISK
VALVE STEM
ORIFICE
Principle of Operation
Type CP400 Base Regulator Operation
The CP400 Series has spring-to-close construction.
The CP400 Series uses a 67CP Series loading
pressure regulator to supply loading pressure to the
top of the main diaphragm. Since the loading pressure
regulator controls the main regulator, adjustment
to the downstream pressure is made to the loading
pressure regulator. The load pressure supplied by the
loading regulator is constant and equal to the desired
downstream pressure plus the pressure required to
overcome the light closing spring.
Increasing Downstream Demand
As downstream demand increases the outlet pressure
registering on the underside of the main diaphragm
decreases and the constant loading pressure above
the main diaphragm forces the diaphragm downward.
This downward diaphragm motion is transferred
through the lever causing the main disk to move away
from the orice seating surface to supply additional
ow downstream to the required demand.
Decreasing Downstream Demand
As downstream demand decreases the outlet pressure
registering on the underside of the main diaphragm
increases forcing the main diaphragm upward. This
upward motion is transferred through the lever causing
the main disk to move toward the orice seating
surface to reduce ow to meet the required demand.
Zero Downstream Demand (Lockup)
As downstream demand decreases further, the outlet
pressure registering under the main diaphragm
together with the closing spring act to close the
Table 5. Outlet Pressure Ranges
TYPE
OUTLET PRESSURE RANGE
(1)
SPRING
NUMBER
PART
NUMBER
SPRING
COLOR
SPRING WIRE DIAMETER SPRING FREE LENGTH
psig bar In. mm In. mm
CP400, CP403
(2)
and CP404
1 to 2 0.07 to 0.14
1
GE30199X012 Yellow Stripe 0.085 2.16 1.47 37.3
2 to 5 0.14 to 0.34
2
GE27213X012 Orange Stripe 0.096 2.44 1.47 37.3
CP400 and
CP404
5 to 10 0.34 to 0.69
3
GE39890X012 Black Stripe 0.114 2.90 1.47 37.3
10 to 20 0.69 to 1.4
4
GE30200X012 Purple Stripe 0.137 3.48 1.43 36.3
1. Outlet pressure range is controlled by 67CP Series loading pressure regulator spring.
2. Maximum operating outlet pressure for the integral True-Monitor™ installed on the Type CP403 is 7.5 psig / 0.52 bar.