Table 5.
Main Valve Maximum Pressure Ratings
BODY SIZE
DIAPHRAGM
MATERIAL
MAXIMUM
OPERATING INLET
PRESSURE
(4)
MAXIMUM
OPERATING
DIFFERENTIAL
PRESSURE
(4)
MAXIMUM
EMERGENCY
INLET AND
DIFFERENTIAL
PRESSURE
MAIN SPRING
COLOR CODE
DIAPHRAGM
DESIGNATION
DN
NPS
bar
psig
bar d
psid
bar d
psid
25
1
17E68 Nitrile (NBR)
Low temperature
6.9
100
6.9
100
6.9
100
Light Blue
130
31.7
460
27.6
400
31.7
460
Black
17E97 Nitrile (NBR)
High pressure and/or
erosion resistance
34.5
500
34.5
500
72.4
1050
Black
72.4
1050
55.2
800
72.4
1050
Black with
White Stripe
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
6.9
100
6.9
100
6.9
100
Light Blue
34.5
500
34.5
(3)
500
51.7
750
Black
51.7
750
34.5
(3)
500
51.7
750
Black with
White Stripe
(2)
50
2
17E68 Nitrile (NBR)
Low temperature
6.9
100
6.9
100
6.9
100
Yellow
31.7
460
27.6
400
31.7
460
Green
17E97 Nitrile (NBR)
High pressure and/or
erosion resistance
34.5
500
34.5
500
72.4
1050
Green
72.4
1050
55.2
800
72.4
1050
Red
(2)
or Purple
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
6.9
100
6.9
100
6.9
100
Yellow
34.5
500
34.5
(3)
500
51.7
750
Green
51.7
750
34.5
(3)
500
51.7
750
Red
(2)
or Purple
(2)
80
3
17E68 Nitrile (NBR)
Low temperature
6.9
100
6.9
100
6.9
100
Yellow
24.8
360
20.7
300
34.5
500
Light Blue
17E97 Nitrile (NBR)
High-pressure and/or
erosion resistance
34.5
500
34.5
500
72.4
1050
Light Blue
72.4
1050
55.2
800
72.4
1050
Black
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
6.9
100
6.9
100
6.9
100
Yellow
34.5
500
34.5
(3)
500
51.7
750
Light Blue
51.7
750
34.5
(3)
500
51.7
750
Black
(2)
100
4
17E68 Nitrile (NBR)
Low temperature
6.9
100
6.9
100
6.9
100
Yellow
24.8
360
20.7
300
34.5
500
Green
17E97 Nitrile (NBR)
High pressure and/or
erosion resistance
34.5
500
34.5
500
72.4
1050
Green
72.4
1050
55.2
800
72.4
1050
Red
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
6.9
100
6.9
100
6.9
100
Yellow
34.5
500
34.5
(3)
500
51.7
750
Green
51.7
750
34.5
(3)
500
51.7
750
Red
(2)
150
6
17E97 Nitrile (NBR)
High pressure and/or
erosion resistance
6.9
100
6.9
100
6.9
100
Yellow
34.5
500
34.5
500
72.4
1050
Green
72.4
1050
55.2
800
72.4
1050
Red
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
6.9
100
6.9
100
6.9
100
Yellow
34.5
500
34.5
(3)
500
51.7
750
Green
51.7
750
34.5
(3)
500
51.7
750
Red
(2)
200
8
17E97 Nitrile (NBR)
High pressure and/or
erosion resistance
6.9
100
6.9
100
6.9
100
Yellow
34.5
500
34.5
500
72.4
1050
Green
72.4
1050
55.2
800
72.4
1050
Red
(2)
1. See Table 1 for main valve structural design ratings and Table 3 for pilot ratings.
2. The red, black, purple, red stripe and black with white stripe springs are only recommended for applications where the maximum inlet pressure can exceed 34.5 bar / 500 psig.
3. For differential pressures above 27.6 bar d / 400 psid diaphragm temperatures are limited to 66°C / 150°F.
4. These are recommendations that provide the best regulator performance for a typical application. Please contact your local Sales Office for further information if a deviation from the standard
recommendations is required.
Type EZR Relief
4
