Emerson ACE95Jr Datový list stáhnout pdf (Strana 3)

Bulletin 74.1:ACE95JR

When the actuator moves downward, it pushes open the

valve plug which allows ow in to the tank. See Figure 2.

When pressure in the tank increases above setpoint, the

large actuator diaphragm is pushed upward, allowing the

valve plug to close.

The valve plug is balanced (inlet pressure creates equal

upward and downward force on these components);

therefore, the outlet (control) pressure of the unit is not

affected by uctuating inlet pressure.

Installation

The Type ACE95jr tank blanketing valve was assembled

and preset to the customer specied pressure and

setpoint at the factory. The outlet (control) pressure range

of the valve is stamped on the nameplate fastened to the

upper actuator case. The gas blanketing setpoint is the

only adjustable feature on this unit.

INLET PRESSURE

TANK PRESSURE

ATMOSPHERIC PRESSURE

VALVE OPEN

VALVE CLOSED

SENSING

CONECTION

ROLLING

DIAPHRAGM

O-RING SEAT

CAGE

POPPET

INLET

TO TANK

Figure 2. Operational Schematic

E0205

Outlet Check Valve—Prevents corrosive gases and

vapors from owing back into the blanketing system

through the delivery line.

Single Array Manifold (SAM)—Provides sense line

connection and main valve connection through a single

tank nozzle.

Inlet Filter—Screens out any foreign material upstream

that may cause blockage in the gas ow.

Principle of Operation

The Type ACE95jr tank blanketing valve 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 large actuator diaphragm. When tank pressure is

less than the valve set pressure, spring force moves the

actuator diaphragm downward.

1 2 3 4 5 6 7 8

Bulletin 74.1:ACE95JR 1

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