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Wafer check valves, also known as dual-plate check valves,
have two spring loaded half-moon shaped discs that rotate about their shaft.
The disc plates are kept shut by a torsion spring. When fluid flows in a
forward direction, the pressure of the fluid causes the disc plates to swing
open, allowing flow. The check valve is closed by the spring as soon as flow
ceases, before any reverse flow can occur.
Normative reference
API 6D Pipeline Valves
API 594 Check Valves: Flanged, Lug, Wafer and
Butt-Welding
ASME B16.34 Valves Flanged, Threaded and Welding Ends
ASME B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2
through 24
ASME B16.47 Series A Large Diameter Steel Flanges: NPS
26 Through NPS 60 Metric/Inch
Standard
ASME B16.25 Buttwelding Ends
ASME B16.10 Face to Face and End to End Dimensions of
Valves
MSS SP-25 Standard Marking System for Valves, Fittings,
Flanges and Unions
Size available
NPS 2 to NPS 24 (DN50 to DN600)
Pressure rating available
Class 150 to Class 900
Class 150
Class 150
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Standard Material Specification
Dimensions and Weights
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Class 300
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Standard Material Specification
Dimensions and Weights
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Class 600
Standard Material Specification
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Part Name
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Material
|
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Body
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A216 WCB, A352 LCB, A351 CF8, A351 CF8M, A351 CF8C, A351
CF3, A351 CF3M
|
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Disc
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A216 WCB, A352 LCB, A351 CF8, A351 CF8M, A351 CF8C, A351
CF3, A351 CF3M
|
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Pin
|
A182 F6a, A182 F22, A182 F304, A182 F316, A182 F321, A182
F304L, A182 F316L
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Spring
|
AISI 9260, AISI 6150, A182 F304, A182 F316, A182 F321,
A182 F304L, A182 F316L
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Dimensions and Weights
|
Size
|
mm
|
50
|
65
|
80
|
100
|
125
|
150
|
200
|
250
|
300
|
350
|
400
|
|
in
|
2
|
2 ½
|
3
|
4
|
5
|
6
|
8
|
10
|
12
|
14
|
16
|
|
|
L (mm)
|
60
|
67
|
73
|
79
|
105
|
136
|
165
|
213
|
229
|
273
|
305
|
|
|
H (mm)
|
110
|
129
|
148
|
192
|
240
|
265
|
319
|
399
|
456
|
489
|
562
|
|
|
Weight (kg)
|
3.5
|
5
|
7
|
12
|
22.5
|
35
|
45
|
77
|
110
|
135
|
163
|
|
Class 900
Standard Material Specification
|
Part Name
|
Material
|
|
Body
|
A216 WCB, A352 LCB, A351 CF8, A351 CF8M, A351 CF8C, A351
CF3, A351 CF3M
|
|
Disc
|
A216 WCB, A352 LCB, A351 CF8, A351 CF8M, A351 CF8C, A351
CF3, A351 CF3M
|
|
Pin
|
A182 F6a, A182 F22, A182 F304, A182 F316, A182 F321, A182
F304L, A182 F316L
|
|
Spring
|
AISI 9260, AISI 6150, A182 F304, A182 F316, A182 F321,
A182 F304L, A182 F316L
|
Dimensions and Weights
|
Size
|
mm
|
50
|
65
|
80
|
100
|
150
|
200
|
|
in
|
2
|
2 ½
|
3
|
4
|
6
|
8
|
|
|
L (mm)
|
70
|
83
|
83
|
102
|
159
|
206
|
|
|
H (mm)
|
142
|
164
|
167
|
205
|
288
|
358
|
|
|
Weight (kg)
|
6.5
|
9
|
14
|
24
|
43
|
56
|
|