Emerson ACE97 Manuale delle Istruzioni Pagina 4
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Type ACE97
4
Product Description
The Type ACE97 Pad-Depad valve is a self-contained,
pilot-operated valve that maintains a blanket of inert gas
on top of a stored product to protect it from atmospheric
contamination. It reduces combustibility, decreases
vaporization, controls vapor space pressure during
pump-in and pump-out operations, and prevents the
tank from entering a vacuum condition and collapsing
upon itself. The Type ACE97 valve provides excellent
and accurate pressure control of the vapor space in the
tank. Blanketing pressure is kept to a minimum in order
to conserve the use of blanketing gas.
Pad (tank blanketing) is used to describe the process
of replacing the vapor space of a storage tank with
an inert gas.
Depad (vapor recovery) is used to describe the
process of relieving or venting the vapor space as
a result of pressure rise.
Tank and vapor recovery connections are available
to meet most customer requirements. A Single Array
Manifold (S.A.M) provides a single tank and sensing
connection and is required for tanks having a single
nozzle. Accessories include gauges, purge meters,
pressure switches, and check valves.
Principle of Operation
Type ACE97 pilot-operated valves (except for the
NPS 1/2 / DN 15 pad valve) control the vapor space
pressure over a stored liquid. The unit is stainless
steel and is controlled by a very large actuator
diaphragm. The oversized actuator diaphragm
offers high sensitivity to changes in tank pressure.
When a storage tank cools and tank vapors condense,
Type ACE97 pad (tank blanketing) valves replace the
condensing vapors with an inert gas to prevent internal
tank pressure from decreasing. Positive tank pressure
prevents outside air from contaminating the product
and reduces the possibility of atmospheric pressure
collapsing the tank.
Additionally, Type ACE97 valves provide depad (vapor
recovery) capabilities through the depad main valve
and depad pilot valve. When the temperature outside
the tank rises causing the vapor inside the tank to
expand, Type ACE97 depad valve vents the excess
tank pressure to a safe place.
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
TANK PRESSURE
VACUUM PRESSURE
PRE-EXPANSION PRESSURE
INTERMEDIATE BLEED PRESSURE
PILOT SUPPLY PRESSURE
INTERMEDIATE PRESSURE
LOADING PRESSURE
PUMP PRESSURE
BYPASS PRESSURE
BACK PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
TANK PRESSURE
VACUUM PRESSURE
PRE-EXPANSION PRESSURE
INTERMEDIATE BLEED PRESSURE
PILOT SUPPLY PRESSURE
INTERMEDIATE PRESSURE
LOADING PRESSURE
BYPASS PRESSURE
BACK PRESSURE
PUMP PRESSURE
BOOST PRESSURE
EXHAUST
PILOT LOADING PRESSURE
VENT HEADER PRESSURE
INLET BLEED PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
TANK PRESSURE
VACUUM PRESSURE
PRE-EXPANSION PRESSURE
INTERMEDIATE BLEED PRESSURE
PILOT SUPPLY PRESSURE
INTERMEDIATE PRESSURE
LOADING PRESSURE
PUMP PRESSURE
BYPASS PRESSURE
BACK PRESSURE
BOOST PRESSURE
EXHAUST
PILOT LOADING PRESSURE
VENT HEADER PRESSURE
INLET BLEED PRESSURE
Vent
Figure 3. Type ACE97 Pad Off / Depad On
POPPET
O-RING
SEAT
ROLLING
DIAPHRAGM
CAGE
INLET
CLOSED PILOT
REGULATOR
ACTUATOR
SENSING
CONNECTION
DIAGNOSTIC
PORT
INERT GAS IN
PAD VALVE
TANK
CONNECTION
DEPAD
MAIN
VALVE
ON/OFF
DIAGNOSTIC
GAUGE
DEPAD PILOT
LOADING PRESSURE
EXHAUSTED BACK TO TANK
INLET PRESSURE
ATMOSPHERIC PRESSURE
TANK PRESSURE
VENT HEADER PRESSURE
PILOT LOADING PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
TANK PRESSURE
VACUUM PRESSURE
PRE-EXPANSION PRESSURE
INTERMEDIATE BLEED PRESSURE
PILOT SUPPLY PRESSURE
INTERMEDIATE PRESSURE
LOADING PRESSURE
PUMP PRESSURE
BYPASS PRESSURE
BACK PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
TANK PRESSURE
VACUUM PRESSURE
PRE-EXPANSION PRESSURE
INTERMEDIATE BLEED PRESSURE
PILOT SUPPLY PRESSURE
INTERMEDIATE PRESSURE
LOADING PRESSURE
BYPASS PRESSURE
BACK PRESSURE
PUMP PRESSURE
BOOST PRESSURE
EXHAUST
PILOT LOADING PRESSURE
VENT HEADER PRESSURE
INLET BLEED PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
TANK PRESSURE
VACUUM PRESSURE
PRE-EXPANSION PRESSURE
INTERMEDIATE BLEED PRESSURE
PILOT SUPPLY PRESSURE
INTERMEDIATE PRESSURE
LOADING PRESSURE
PUMP PRESSURE
BYPASS PRESSURE
BACK PRESSURE
BOOST PRESSURE
EXHAUST
PILOT LOADING PRESSURE
VENT HEADER PRESSURE
INLET BLEED PRESSURE
Vent
CONTROLLED
PRESSURE
RANGE SPRING
MAIN
VALVE
SPRING
E0004
VENT
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