NOTES
The dew point of the pilot line air pres-
sure must be maintained below the low-
est ambient temperature to which the dry
pilot actuation system will be exposed.
Accumulation of water in the pilot line
connection to the Actuator will lower the
air pressure at which the Actuator will
open and possibly prevent proper opera-
tion. Also, introduction of moisture into
the pilot lines exposed to freezing tem-
peratures can create an ice buildup that
could prevent proper operation of the Ac-
tuator.
An air dryer must be installed where the
moisture content of the air supply is not
properly controlled at less than the re-
quired value.
It is recommended that an AMD-3 Nitro-
gen Maintenance Device be utilized in
dry pilot actuation system applications
where the dew point must be maintained
below -29°C. See Technical Data Sheet
TFP1241.
If supply pressure is variable, assume minimum expected value.
DN40
Bar
DN50
Maximum Pilot Height, Meters
DN100 DN150DN80
1,4 1,4 0,9 1,4 5,2 5,5
2,8 7,3 5,8 9,1 11,9 11,6
4,1 14,0 11,6 15,8 16,5 17,1
5,5 17,8 16,5 21,3 18,3 21,3
6,9 23,8 23,8 28,3 23,8 30,2
8,3 26,5 26,5 35,7 35,10 39,6
9,7 32,0 32,6 42,4 43,3 46,9
11,0 38,7 37,5 49,1 53,6 49,1
12,1 40,8 42,1 52,4 52,1 59,1
13,8 48,8 48,8 62,8 68,0 65,8
15,5 56,4 50,6 72,2 71,0 75,0
17,2 61,3 60,7 76,5 75,3 83,8
Pressure,
Supply
(2)
(1)
Maximum pilot height for up to 150 meters of equivalent length
of pilot line (pipe plus fittings).
Interpolation between data points is permitted.
(1)
(2)
(3)
DN200
2,7
11,6
13,4
17,8
19,8
29,3
43,0
51,8
50,1
62,8
76,2
78,3
WATER SUPPLY PRESSURE IN BAR
RANGE
O
F
ACTUA
T
O
R
OPE
NING
PRE
SSURE
MINIM
U
M
SYSTEM
AI
R
PRES
SURE
S
S
E
R
P
R
I
A
E
R
U
R
A
B
N
I
1,0
1,0
0
2,0
3,0
4,0 7,0 10,0 13,0 16,0
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