Emerson CP200 Instruction Manual download pdf (Page 5)

CP200 Series

CLOSING SPRING

DIAPHRAGM

CONTROL SPRING

VALVE STEM

LEVER

PRESSURE RETAINING

PLUG (DO NOT REMOVE)

MAIN REGULATOR

TYPE 67CP PRESSURE

LOADING REGULATOR

SECONDARY SEAT™ DETAIL

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

LOADING PRESSURE

Type CP206 Secondary Seat Protection

with Bleed

The Type CP206 provides small bleed to the downstream

system as an indication that the Secondary Seat is providing

lockup. In the event that the primary orice 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 Token relief

valve begins to discharge a small amount of 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.

Types CP205 and CP206 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.

CP200 Series with Secondary Seat

Protection

CONTROL SPRING

RELIEF V LVE STEM

VALVE STEM

SECONDARY SEAT DETAIL

M1165

Figure 3. Type CP205IT Pressure Loaded Pressure Reducing Regulator with Internal Registration and Token Relief Operational Schematic

PRIMARY DISK

NORMAL OPERATION

NORMAL LOCKUP

DEBRIS OBSTRUCTING

LOCKUP

SECONDARY SEAT

LOCKUP

TYPE CP206

SECONDARY SEAT WITH

METAL TO METAL BLEED

PRIMARY ORIFICE

SEATING SURFACE

SECONDARY

SEATING SURFACE

METALLIC SECONDARY ORIFICE

SEATING SURFACE

SECONDARY SEAT DETAILED VIEW

ELASTOMERIC SECONDARY

SEATING SURFACE

1 2 3 4 5 6 7 8 9 10 11 12

CP200 Series 1

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Emerson CP200 Instruction Manual Page 5

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