
Type ACE95JR
3
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.
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 the setpoint,
the large actuator diaphragm is pushed upward, allowing
the valve plug to close.
The valve plug is balanced (inlet pressure equal upward
and downward force on these components); therefore,
the outlet (control) pressure of the unit is not affected by
uctuating inlet pressure.
!
Figure 2. Type ACE95jr Operational Schematic
E0205
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