CP200 Series
4
Principle of Operation
Refer to Figure 2. The CP200 Series has spring-to-close
construction and uses 67CP Series pressure loading 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
using 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.
Type CP200 Base Regulator
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 orice 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 orice 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 main disk against the
orice seating surface. At this point the loading regulator will
continue to supply a small amount of gas downstream that is
equal to the capacity of the bleed restriction in the diaphragm
assembly. As downstream demand decreases to zero ow
outlet pressure rises to meet the lock-up pressure of the
loading regulator. This causes the loading regulator to lock up
to stop all ow downstream.
Type CP205 with Secondary Seat™ Protection
Refer to Figure 3. The Type CP205 provides
Secondary Seat Protection. As downstream demand
decreases and downstream pressure rises to the regulator
pressure lock-up value, the regulator will lock up. If,
however, damage has occurred to the primary disk, to the
primary orice’s seating surface, or debris has become
lodged between the primary disk and primary orice, the
outlet pressure will continue to rise. This additional pressure
causes the primary disk to apply additional force to the
orice seating surface, which causes the secondary seating
surface to move toward the secondary disk or sealing
surface. If downstream demand decreases to zero, then the
secondary seating surface will contact the sealing surface to
provide lockup.
Figure 2. Type CP200IN Pressure Loaded Pressure Reducing Regulator with Internal Registration Operational Schematic
M1129
CLOSING SPRING
DIAPHRAGM
CONTROL SPRING
VALVE DISK
ORIFICE
VALVE STEM
LEVER
PRESSURE RETAINING
PLUG (DO NOT REMOVE)
MAIN REGULATOR
TYPE 67CP PRESSURE
LOADING REGULATOR
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
(2 pages)
(5 pages)
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