Face to Face Dimensions Dual Plate
Lug Check Valves API Std 594 Class 150-2500 Type A

NPS	CLass
NPS	150 F	300 F	600 F	900 F	1500 F	2500 F
2	60	60	60	70	70	70
2.1/2	67	67	67	83	83	83
3	73	73	73	83	83	86
4	73	73	79	102	102	105
6	98	98	136	159	159	159
8	127	127	165	206	206	206
10	146	146	213	241	248	254
12	181	181	229	292	305	305
14	184	222	273	356	356
16	191	232	305	384	384
18	203	264	362	451	468
20	219	292	368	451	533
24	222	318	438	495	559
30	305	368	505
36	368	483	635
42	432	568	701
48	524	629

General notes..

Dimensions are in millimeters unless otherwise indicated.
The face-to-face tolerance shall be as specified in ASME B16.10 for sizes
through NPS 24 and shall be 3 mm for sizes larger than NPS 24.
Flange faces with ring-joint grooves shall conform to the dimensions
shown in either ASME B16.5 or ASME B16.47, as applicable.

Notes..

The optional configuration of a full flange or lug flange shall be
the manufacturer's standard unless otherwise specified by the purchaser.
Unless otherwise specified in the purchase order, the bolt holes will be through-drilled.

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Dual-Plate Double-flanged Check Valves
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Face to Face Dimensions Dual Plate Lug Check Valves API Std 594 Class 150-2500 Type A

Face to Face Dimensions Dual Plate
Lug Check Valves API Std 594 Class 150-2500 Type A