Piston Check Valves - API 6D
​Sizes: 2" - 24"
​Classes: 150 - 2500
SCV Valve ​manufactures a premium array of check valves. Our  products are manufactured and tested in accordance with respective API, ASME, and ANSI standards.

SCV Piston Check Valves are quiet operating valves that effectively prevent backflow. The “flapperless” design is gentle on the seat as the piston rises and lowers with increased and decreased flow rates.

The SCV designs offers many features and options beneficial for oil, liquid gas, and liquid applications.
DESIGN & MANUFACTURING STANDARDS
Basic Design API 6D
Wall Thickness API 6D
Face-to-Face Dimensions As stated
Flange End Dimensions ANSI/ASME 16.5
Butt-Weld End Dimensions ANSI/ASME B16.25
Inspection and Testing API 6D
EXPANDED VIEWS & BILLS OF MATERIALS (Click link for information.)​
Piston Check Valve
DIMENSIONAL DATA (Click link for information.)​​
Class: 150; Sizes: 2" - 24"
Class: 300; Sizes: 2" - 16"
Class: 600; Sizes: 2" - 24"
Class: 900; Sizes: 2" - 12"
Class: 1500; Sizes: 2" - 12"
Class: 2500; Sizes: 2" - 12"
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Piston Check Valve - Expanded View (See "Bill of Materials" below)
Bill of Materials
No. Part WCC
1 Body A216 WCC
2 Bonnet A105
3 Piston A105+Ni-Trid+St. 6
4 Seat A105+St. 6
5 Cage A105+ENP
6 Piston Ring PEEK/Glass Filled
7 Stud A193 B7M
8 Heavy Hex Nut A193 2HM
9 O-ring Viton AED
10 Bonnet Gasket SS/Graphite
11 Vent Fitting 316 SS
12 Ball Check 316 SS
13 Orifice Fitting 316 SS
14 Lift Lug Steel
15 Spring X-750
All piston check valves 2” thru 6”, in all pressures, comes standard with a X-750 spring installed. Note: Available in other materials upon request.
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DIMENSIONAL DATA - PISTON CHECK VALVES
DIMENSIONAL DATA
Piston Check Valves - API 6D
​Sizes: 2" - 24"
​Class: 150
SIZE IN 2 3 4 6 8 10 12 14 16 18 20 24
MM 50 80 100 150 200 250 300 350 400 450 500 600
A - RF IN 8.0 9.5 11.5 16 19.5 24.5 27.5 31 36 38.5 38.5 51
MM 203 241 292 406 495 622 699 787 914 978 978 1295
H1 IN 3.25 4.875 5 6.75 9.25 11.75 13.25 14.875 17 / / /
MM 83 124 127 171 235 298 337 378 432 / / /
H2 IN 7.0 8.35 10.23 14.56 17.83 22.48 25.51 27.25 30.125 / / /
MM 178 212 260 370 451 571 648 692 765 / / /
WEIGHT
(RF)		 LB 64 124 201 332 610 1040 1328 2010 2480 / / /
KG 29 56 91 151 277 472 602 912 1125 / / /
DIMENSIONAL DATA
Piston Check Valves - API 6D
​​Sizes: 2" - 16"
​Class: 300
SIZE IN 2 3 4 6 8 10 12 14 16 18 20 24
MM 50 80 100 150 200 250 300 350 400 450 500 600
A-RF IN 10.25 14.75 17.625 19.375 22.5 29.625 32 35.25 39.125 / / /
MM 260 375 448 492 572 752 813 895 994 / / /
A- BW IN AUR AUR AUR AUR AUR AUR AUR AUR AUR / / /
MM AUR AUR AUR AUR AUR AUR AUR AUR AUR / / /
H1 IN 3.25 4.875 5 6.75 9.25 11.75 13.25 14.875 17 / / /
MM 83 124 127 171 235 298 337 378 432 / / /
H2 IN 8.5 10.25 12.5 17.5 20.125 23.75 24.375 27.25 30.125 / / /
MM 216 260 318 445 511 603 619 692 765 / / /
WEIGHT
(RF)		 LB 80 155 250 415 750 1300 1660 2500 3100 / / /
KG 36 70 114 187 341 591 755 1136 1409 / / /
AUR = Available Upon Request
DIMENSIONAL DATA
Piston Check Valves - API 6D
​Sizes: 2" - 24"
​Class: 600
SIZE NPS 2 3 4 6 8 10 12 14 16 18 20 24
DN 50 80 100 150 200 250 300 350 400 450 500 600
A - RF IN 11 14.75 18.5 20.75 24 30.875 33.625 37 41.25 46 55.5 60
MM 279 375 470 527 610 784 854 940 1048 1168 1410 1524
A - RTJ IN 11.375 14.875 18.625 20.875 24.125 30.875 33.75 37.125 41.375 46.125 55.75 60.125
MM 283 378 461 530 613 787 857 943 1051 1172 1413 1527
A - BW IN AUR AUR AUR AUR AUR AUR AUR AUR AUR AUR AUR AUR
MM AUR AUR AUR AUR AUR AUR AUR AUR AUR AUR AUR AUR
H1 IN 3.25 5.25 5.375 7 9.25 11.75 13.125 14.875 17 19.25 20.875 22.125
MM 83 133 137 178 235 298 333 378 432 489 530 561
H2 IN 8.5 10.25 12.125 18 20.25 24.25 25.125 28.125 31.25 32.875 35.25 38.78
MM 216 260 308 457 514 616 638 714 794 835 895 985
WGT
(RF)		 LB 85 175 290 550 810 1650 2450 2900 3700 4600 7900 10200
KG 39 80 132 250 368 750 1114 1318 1682 2091 3591 4636
AUR = Available Upon Request
DIMENSIONAL DATA
Piston Check Valves - API 6D
​Sizes: 2" - 12"
​Class: 900
SIZE NPS 2 3 4 6 8 10 12 14 16 18 20 24
DN 50 80 100 150 200 250 300 350 400 450 500 600
A - RF IN 13.625 14.875 19.375 21.875 24.875 31.375 33.875 / / / / /
MM 346 378 492 556 632 797 860 / / / / /
A - RTJ IN 13.75 15 19.5 22 25 31.5 33.125 / / / / /
MM 349 381 495 559 635 800 857 / / / / /
A - BW IN AUR AUR AUR AUR AUR AUR AUR / / / / /
MM AUR AUR AUR AUR AUR AUR AUR / / / / /
H1 IN 3.25 5.25 5.375 7 9.25 11.75 13.125 / / / / /
MM 83 133 137 178 235 298 333 / / / / /
H2 IN 8.5 10.25 12.125 18 20.25 24.25 25.125 / / / / /
MM 216 260 308 457 514 616 638 / / / / /
WGT
(RF)		 LB 85 175 290 550 810 1650 2450 / / / / /
KG 39 80 132 250 368 750 1114 / / / / /
AUR = Available Upon Request
DIMENSIONAL DATA
Piston Check Valves - API 6D
​Sizes: 2" - 12"
​Class: 1500
SIZE IN 2 3 4 6 8 10 12 14 16 18 20 24
MM 50 80 100 150 200 250 300 350 400 450 500 600
A - RF IN 13.625 17.25 20.25 24 32.375 34.375 41 50.5 / / / /
MM 346 438 514 610 822 873 1041 1283 / / / /
A - RTJ IN 13.75 17.325 20.375 24.25 32.75 35 41.675 51.25 55.39 61.38 / /
MM 349 440 518 616 832 889 1059 1302 1407 1559 / /
A - BW IN AUR AUR AUR AUR AUR AUR AUR AUR AUR AUR / /
MM AUR AUR AUR AUR AUR AUR AUR AUR AUR AUR / /
H1 IN 3.25 5.25 5.375 7 9.25 11.75 13.125 14.875 / / / /
MM 83 133 137 178 235 298 333 378 / / / /
H2 IN 8.5 10.25 12.125 18 20.25 24.25 25.125 28.125 33.62 36.42 / /
MM 216 260 308 457 514 616 638 714 854 925 / /
WEIGHT
(RF)		 LB 85 175 290 550 810 1650 2450 2900 / / / /
KG 39 80 132 250 368 750 1114 1318 / / / /
AUR = Available Upon Request
DIMENSIONAL DATA
Piston Check Valves - API 6D
​Sizes: 2" - 12"
​Class: 2500
SIZE NPS 2 3 4 6 8 10 12 14 16 18 20 24
DN 50 80 100 150 200 250 300 350 400 450 500 600
A - RF IN 14.875 20.25 23.125 32 37.375 40.375 / / / / / /
MM 378 512 587 813 949 1026 / / / / / /
A - RTJ IN 15 20.5 23.5 32.5 38 41.25 / / / / / /
MM 381 521 597 826 965 1022 / / / / / /
A - BW IN AUR AUR AUR AUR AUR AUR / / / / / /
MM AUR AUR AUR AUR AUR AUR / / / / / /
H1 IN 3.25 5.25 5.375 7 9.25 11.75 / / / / / /
MM 83 133 137 178 235 298 / / / / / /
H2 IN 8.5 10.25 12.125 18 20.25 24.25 / / / / / /
MM 216 260 308 457 514 616 / / / / / /
WEIGHT
(RF)		 LB 85 175 290 550 810 1650 / / / / / /
KG 39 80 132 250 368 750 / / / / / /
AUR - Available Upon Request
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