Table 10.
Main Valve Maximum Pressure Ratings, Diaphragm Selection Information and Main Spring Selection
(1)
BODY SIZE
NPS / DN
DIAPHRAGM
MATERIAL
MAXIMUM
OPERATING INLET
PRESSURE
(4)
MAXIMUM
OPERATING
DIFFERENTIAL
PRESSURE
(4)
MAXIMUM
EMERGENCY INLET
AND DIFFERENTIAL
PRESSURE
MAIN SPRING
COLOR CODE
DIAPHRAGM
DESIGNATION
psig
bar
psid
bar d
psid
bar d
1 and 1-1/4 x 1 /
25 and 32 x 25
17E68 Nitrile (NBR)
Low temperature
100
6.9
100
6.9
100
6.9
Light Blue
130
460
31.7
400
27.6
460
31.7
Black
17E97 Nitrile (NBR)
High pressure and/or erosion
resistance
500
34.5
500
34.5
1050
72.4
Black
1050
72.4
800
55.2
1050
72.4
Black with White
Stripe
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
100
6.9
100
6.9
100
6.9
Light Blue
500
34.5
500
34.5
(3)
750
51.7
Black
750
51.7
500
34.5
(3)
750
51.7
Black with White
Stripe
(2)
2 x 1 / 50 x 25
17E68 Nitrile (NBR)
Low temperature
100
6.9
100
6.9
100
6.9
Light Blue
360
24.8
300
20.7
360
24.8
Black with White
Stripe
17E97 Nitrile (NBR)
High pressure and/or erosion
resistance
500
34.5
500
34.5
500
34.5
Black with White
Stripe
1050
72.4
800
55.2
1050
72.4
Red Stripe
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
100
6.9
100
6.9
100
6.9
Light Blue
750
51.7
500
34.5
(3)
750
51.7
Black with White
Stripe
2 / 50
17E68 Nitrile (NBR)
Low temperature
100
6.9
100
6.9
100
6.9
Yellow
460
31.7
400
27.6
460
31.7
Green
17E97 Nitrile (NBR)
High pressure and/or erosion
resistance
500
34.5
500
34.5
1050
72.4
Green
1050
72.4
800
55.2
1050
72.4
Red
(2)
or Purple
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
100
6.9
100
6.9
100
6.9
Yellow
500
34.5
500
34.5
(3)
750
51.7
Green
750
51.7
500
34.5
(3)
750
51.7
Red
(2)
or Purple
(2)
3 / 80
17E68 Nitrile (NBR)
Low temperature
100
6.9
100
6.9
100
6.9
Yellow
360
24.8
300
20.7
500
34.5
Light Blue
17E97 Nitrile (NBR)
High pressure and/or
erosion resistance
500
34.5
500
34.5
1050
72.4
Light Blue
1050
72.4
800
55.2
1050
72.4
Black
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
100
6.9
100
6.9
100
6.9
Yellow
500
34.5
500
34.5
(3)
750
51.7
Light Blue
750
51.7
500
34.5
(3)
750
51.7
Black
(2)
4, 6 x 4
and 8 x 4 /
100, 150 x 100
and 200 x 100
17E68 Nitrile (NBR)
Low temperature
100
6.9
100
6.9
100
6.9
Yellow
360
24.8
300
20.7
500
34.5
Green
17E97 Nitrile (NBR)
High pressure and/or
erosion resistance
500
34.5
500
34.5
1050
72.4
Green
1050
72.4
800
55.2
1050
72.4
Red
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
100
6.9
100
6.9
100
6.9
Yellow
500
34.5
500
34.5
(3)
750
51.7
Green
750
51.7
500
34.5
(3)
750
51.7
Red
(2)
6, 8 x 6
and 12 x 6 /
150, 200 x 150
and 300 x 150
17E97 Nitrile (NBR)
High pressure and/or
erosion resistance
100
6.9
100
6.9
100
6.9
Yellow
500
34.5
500
34.5
1050
72.4
Green
1050
72.4
800
55.2
1050
72.4
Red
(2)
17E88 Fluorocarbon (FKM)
High aromatic hydrocarbon
content resistance
100
6.9
100
6.9
100
6.9
Yellow
500
34.5
500
34.5
(3)
750
51.7
Green
750
51.7
500
34.5
(3)
750
51.7
Red
(2)
8 / 200
17E97 Nitrile (NBR)
High pressure and/or
erosion resistance
100
6.9
100
6.9
100
6.9
Yellow
500
34.5
500
34.5
1050
72.4
Green
1050
72.4
800
55.2
1050
72.4
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 500 psig / 34.5 bar.
3. For differential pressures above 400 psid / 27.6 bar d diaphragm temperatures are limited to 150°F / 66°C.
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.
14
Type EZR
