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blanketing gas at the specified inlet pressure under full
flow conditions.
Outlet Piping
Type ACE95 or Type ACE95Sr valve outlet is piped into
the tank vapor space. Outlet piping must be full size
and self-draining to the tank. The valve should be
situated above and as close as possible to the tank
vapor space for best performance.
Sensing Line
The sensing line should be 1/2-inch tubing or pipe,
must slope toward the tank, and should not contain low
points (or traps) that could catch liquid. The sensing line
must enter the tank above the liquid level at a point that
senses the vapor space pressure and is free from
turbulence associated with tank nozzles or vents.
Best control is obtained when both
connections to the tank are separate. If
the tank has only one available nozzle,
contact Fisher Controls for alternate
methods of installation. A single array
manifold is available for such situations.
Gauges and Shut-Off Valves
Inlet gas shut-off valves are desirable for servicing. If
this ACE95 Series tank blanketing valve was not
ordered with an inlet pressure gauge, it is advisable to
install a gauge between the inlet shut-off valve and the
blanketing valve.
Safety considerations may dictate full
port shut-off valves between the tank and
blanketing valve, and at the valve inlet.
Startup, Adjustment, and Shutdown
Tank vents and safety relief valves must
be in place and operating.
Always open the outlet valve before the
inlet valve. Operation in the reverse
Note
Note
Note
order could result in inlet pressure being
applied to the actuator casing, poten-
tially damaging it.
Startup
1. Open shut-off valves between the blanketing valve
and the tank (both sensing and outlet). See figure 4.
2. Slowly open the supply line shut-off valve (to the
blanketing valve) and leave it fully open.
3. Monitor the tank vapor space pressure.
ADJUSTING SCREW
(KEY 2)
ACTUATOR CAP
(KEY 1)
VENT
(KEY 6)
SPRING CASE
(KEY 7)
W8160
Figure 5. Spring Case, Adjusting Screw, and Actuator Cap
Adjustment
The set point of this unit is factory set. If an adjustment
is to be made, it should be done so in small increments
while the unit is supplying gas to the tank. To change
the set point:
1. Unscrew and remove the actuator cap (key 1) from
the top of the spring case (key 7). See figure 5.
2. Loosen the lock nut (key 3) and turn the adjusting
screw (key 2) clockwise to raise the set point. (Turning
the screw counter-clockwise lowers the set point.)
3. Observe the effects of the change.
4. When the adjustment is complete, tighten the lock
nut (key 3) and replace the actuator cap (key 1).
ACE95 Series
LOCK NUT
(KEY 3)
5
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