Emerson T205B Bedienerhandbuch PDF herunterladen (Seite 3)

Type T205B

When pressure in the tank increases, the actuator

diaphragm is pushed. Through the action of the pusher

post assembly, lever and valve stem, the valve disk

moves closer to the orice reducing gas ow.

The regulator plug is balanced (inlet pressure

creates equal upward and downward forces on these

components) see Figure 4, therefore, the outlet

(control) pressure of the unit is not affected by inlet

pressure variation.

Principle of Operation

Refer to Figure 2. Type T205B tank blanketing

regulator controls the vapor space pressure over a

stored liquid. When liquid is pumped out of the tank or

vapors in the tank condense, the pressure in the tank

decreases. Tank pressure is sensed by the actuator

diaphragm. Spring force pushes the pusher post

assembly, the valve disk moves away from the orice,

allowing the gas ow to increase.

Type T205B Tank Blanketing Regulator

MXXXX

November 2012

Type T205B

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

ORIFICE

BALANCED TRIM

ASSEMBLY

VALVE DISK

CONTROL SPRING

LEVER

PUSHER POST

PRESSURE

REGISTRATION

DIAPHRAGM

TYPE Y602-1 VENT

Figure 2. Type T205B Operational Schematic

HORIZONTAL PIPELINE

VENT POINTED DOWN

DOWNSTREAM CONTROL LINE

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

LOADING PRESSURE

1 2 3 4 5 6 7 8 ... 11 12

Type T205B 1

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