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 Ofce for further information if a deviation from the
standard recommendations is required.
14
Type EZR
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