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VALVE
PLUG
E0075_07/2008
INLET PRESSURE
ATMOSPHERIC PRESSURE
OUTLET/EXHAUST PRESSURE
LOADING PRESSURE
Figure 2. Type 1808 with 6358 Series Operational Schematic
Table 1. Available Configurations
TYPE
1808
1808A
Table 2. Types 6358 and 6358B Set Pressure Ranges, Pressure Ratings and Pilot Spring Information
SET PRESSURE RANGE
psig
bar
3 to 18
0.21 to 1.2
15 to 40
1.0 to 2.8
35 to 125
2.4 to 8.6
Table 3. Flow and Sizing Coefficients
FLOW COEFFICIENT
TYPE
C
g
1808
1410
1808A
1800
PILOT EXHAUST
PILOT
MAIN VALVE
Part Number
1B986027212
1E392527022
1K748527202
(WIDE-OPEN)
C
v
40.1
51.4
UPPER PORTION
OF VALVE PLUG
TO EXHAUST
PORT
LOWER PORTION
OF VALVE PLUG
TO MAIN VALVE
DIAPHRAGM
CONTROL SPRING
SPRING
DIAPHRAGM
UPPER PORTION
OF VALVE PLUG
TO EXHAUST
PORT
LOWER PORTION
OF VALVE PLUG
TO MAIN VALVE
DIAPHRAGM
PILOT TYPE
6358
6358B
6358
6358B
PILOT SPRING INFORMATION
Color
Green
Yellow
Red
C
K
1
m
35.2
0.79
35.0
0.76
Type 1808
TYPE 6358 BACKPRESSURE SERVICE
TYPE 6358B RELIEF SERVICE
DESCRIPTION
Globe-style body for backpressure applications
Globe-style body for relief applications
Angle-style body for backpressure applications
Angle-style body for relief applications
Wire Diameter
In.
mm
0.120
3.05
0.148
3.76
0.192
4.88
IEC SIZING COEFFICIENT
X
F
T
L
0.89
0.78
0.87
DIAPHRAGM
ASSEMBLY
HOLLOW
PASSAGE
IN VALVE
PLUG STEM
RESTRICTION PLUG
DIAPHRAGM
ASSEMBLY
HOLLOW
PASSAGE
IN VALVE
PLUG STEM
FIXED RESTRICTION
Free Length
In.
mm
2.12
54.0
2.00
51.0
2.19
55.6
F
D
0.50
3
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