Data Sheet

Bulletin 74.3:ACE97
2
Pad Specications

NPS 1/2, 1, and 2 / DN 15, 25, and 50

(1)
200 psig / 13.8 bar

(1)
200 psig 13.8 bar

(1)
See Table 1

(1)
 25 psig / 1.7 bar
 200 psig / 13.8 bar

(1)
20 psig / 1.4 bar

(110% of rated C
v
)
C
v
= 0.2 use C
v
= 0.22 C
v
= 7.5 use C
v
= 8.25
C
v
= 0.4 use C
v
= 0.44 C
v
= 10 use C
v
= 11
C
v
= 1 use C
v
= 1.1 C
v
= 20 use C
v
= 22
C
v
= 2 use C
v
= 2.2 C
v
= 45 use C
v
= 50
C
v
= 4 use C
v
= 4.4 C
v
= 60 use C
v
= 66
Depad Specications

NPS 1, 2, 3, and 4 / DN 25, 50, 80, and 100

(1)
See Table 1

C
v
= 3, C
v
= 12, or C
v
= 17
C
v
= 20, C
v
= 35, or C
v
= 70
C
v
= 6, C
v
= 90, C
v
= 115, or C
v
= 140
C
v
= 150, C
v
= 200, or C
v
= 280

General Type ACE97 Specications

External


-20 to 180°F / -29 to 82°C

0 to 212°F / -18 to 100°C

-20 to 212°F / -29 to 100°C

-20 to 212°F / -29 to 100°C


NPS 1/2 and 1 / DN 15 and 25; C
v
= 0.2 and C
v
= 0.4:
316L Stainless steel
NPS 1 and 2 / DN 25 and 50; C
v
= 1 to 4 and C
v
= 5 to 10:
316 Stainless steel
NPS 2 / DN 50; C
v
= 20 to 60:
CF3M/CF8M Stainless steel
316 Stainless steel
316 Stainless steel
316 Stainless steel
stainless steel
Nitrile (NBR), Fluorocarbon (FKM),
Peruoroelastomer (FFKM), or
Ethylenepropylene (EPDM - FDA)
Nitrile (NBR), Fluorocarbon (FKM), or
Ethylenepropylene (EPDM - FDA)


70 pounds / 32 kg

105 pounds / 48 kg

175 pounds / 79 kg
1. The pressure/temperature limits in this Bulletin or any applicable standard limitation should not be exceeded.

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 helps
prevent 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) – ensures a minimum pressure is maintained
in the tank vapor space during normal operation.
Depad (Vapor Recovery) – limits tank pressure to a maximum value
during normal operation.
Tank and vapor recovery connections are available to meet most
customer requirements. A Single Array Manifold (SAM) 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.

 Type ACE97 valves (NPS 1 / DN 25 and larger)
are pilot-operated for a higher degree of accuracy and control.
 A fully balanced valve eliminates setpoint changes
caused by variations in inlet pressure.

 Displays pressure of blanketing gas supply
to the blanketing valve.
 Low-pressure gauge measures
tank pressure.
 Allows for the installation of an alarm system to
indicate either low or high-pressure on the tank.
 Provides a visual indication of blanketing gas ow.
 Prevents corrosive gases and vapors from
owing back into the blanketing system.
 Allows analysis of valve operation in the eld,
simplifying service and reliability. (Only available on NPS 1 and 2 /
DN 25 and 50 pad valve.)