Emerson CP200 Arkusz Danych Pobierz pdf (Strona 5)

Bulletin 71.1:CP200

Principle of Operation

Refer to Figure 3. The CP200 Series has spring-to-

close construction and uses a 67CP Series pressure

loading regulator to supply loading pressure to the top

of the main diaphragm. Adjustment to the downstream

pressure is therefore made by adjusting 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 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

main disk against the orice 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 lockup to stop all ow downstream.

Figure 3. 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

1 2 3 4 5 6 7 8 9 10 ... 27 28

Bulletin 71.1:CP200 1

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