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Duo-ChekValves
Spring&DrainSize Information
Technical Data
ASMEClass 125 (Cast Iron) ScheduleA
2" – 8"
1
⁄
8
"
(50mm – 200mm)
(3.18mm)
10" – 12"
3
⁄
8
"
(250mm – 300mm)
(9.52mm)
14" & up
3
⁄
4
"
(350mm& up)
(19.1mm)
ASMEClass 150-2500ScheduleB
2" - 2
1
⁄
2
"
1
⁄
4
"
(50mm – 65mm)
(6.35mm)
3" - 4"
3
⁄
8
"
(75mm – 100mm)
(9.52mm)
5"
1
⁄
2
"
(125mm)
(12.7mm)
6" & up
3
⁄
4
"
(150mm)
(19.1mm)
BodyDrainHoleSizes
(Availablewhen specified)
Spring
Operating TemperatureRange
Material
°C
°F
Type 316S.S.
-129 to 120 -200 to 250
Inconel 600
-250 to 315 -420 to 600
Inconel X-750
-250 to 537 -420 to 1000
SpringSelectionGuide
• Springmaterials are included in trimmaterials as
an important part of materials selection.Themost
common standard trimmaterials are shownunder
Ordering Information.
• For unique service conditions, different torque
springs aswell as other springmaterials are
available. Please consult factory.
• All drainholes are located on the downstream side
of the valve.
ValveCoefficient Cv
ValveSize Class 125-300
in mm
2"
50
75
21/2"
65
95
3"
80
191
4"
100
377
5"
127
483
6"
150
821
8"
200
1,590
10"
250
2,920
12"
300
4,470
14"
350
5,870
16"
400
8,690
18"
450
10,940
20"
500
14,290
24"
600
23,000
30"
750
37,200
36"
900
59,000
42"
1050
92,000
48"
1200
126,000
54"
1350
186,000
60"
1500
217,000
66"
1650
280,000
72"
1800
350,000
Class 150SpringCrackingPressure (PSI)
ValveSize
Std.Torque
LowTorque Min.Torque
in mm
2"
50
0.23
0.13
0.05
2 1/2"
65
0.26
0.12
0.04
3"
80
0.21
0.16
0.04
4"
100
0.22
0.11
0.05
5"
127
0.18
0.09
0.05
6"
150
0.14
0.07
0.04
8"
200
0.19
0.10
0.04
10"
250
0.18
0.10
0.04
12"
300
0.17
0.07
0.04
14"
350
0.15
0.06
0.04
16"
400
0.16
0.08
0.03
18"
450
0.15
0.07
0.03
20"
500
0.13
0.06
0.03
24"
600
0.10
0.05
0.03
30"
750
0.08
–
–
36"
900
0.08
–
–
42"
1050
0.05
–
–
48"
1200
0.06
–
–
• Spring crackingpressure is anestimateof thepressure required to overcome the
spring force when valve is closed. This is not exact as valve cannot be used as a
relief valve. Theuseof lowandmin. torquespringscouldeffect thevalveperformance
and should only be usedwhen unique service conditions areevaluated.
• Valves 6" and larger have independent springs.
