Trusted Dual Plate Check Valve Manufacturer

NTVAL provides durable Dual Plate Check Valves designed for efficient and reliable operation in demanding applications. Engineered to prevent backflow and protect your system, our valves offer cost-effective solutions that meet industry standards.

Your Source for Superior Valve Products

Learn More About Dual Plate Check Valve

  • Spring Loaded
  • Size Range: NPS 2 to NPS 48
  • Pressure Range: 150LB to 2500LB
  • Design STD.: API594/ API6D
  • Dual Plate Check Valve Manufacturer & Supplier
Dual Plate Check Valve 7

Dual Plate Check Valve Design Features

Dual Plate Check Valve 8

Main Parts Materials

Carbon Steel
BODYDISCBODY SEATDISC SEATSPRINGWETTED PARTS
A216 Gr.WCBA351 Gr.CF8MSame as BodySame asDiscInconel X-750316 SS
A216 Gr.WCBA351 Gr.CF8MVitonSame asDiscInconel X-750316 SS
A216 Gr.WCBA351 Gr.CF8MStellite overlaySame asDiscInconel X-750316 SS
A216 Gr.WCBA217 Gr.CA15410SS overlaySame asDiscInconel X-750410 SS
A216 Gr.WCBA217 Gr.CA15Stellite overlaySame asDiscInconel X-750410 SS
Low Temperature Carbon Steel
BODYDISCBODY SEATDISC SEATSPRINGWETTED PARTS
A352 Gr.LCCA351 Gr.CF8MSame as BodySame asDiscInconel X-750316 SS
A352 Gr.LCCA351 Gr.CF8MBuna-NSame asDiscInconel X-750316 SS
A352 Gr.LCCA351 Gr.CF8MStellite overlaySame asDiscInconel X-750316 SS
Stainless Steel
BODYDISCBODY SEATDISC SEATSPRINGWETTED PARTS
A351 Gr.CF8MA351 Gr.CF8MSame as BodySame asDiscInconel X-750316 SS
A351 Gr.CF8MA351 Gr.CF8MVitonSame asDiscInconel X-750316 SS
A351 Gr.CF8MA351 Gr.CF8MStellite overlaySame as DiscInconel X-750316 SS

Flow Volume vs Pressure Drop

Dual Plate Check Valve 9

Friction Factor Flow Coefficiency

SIZEFriction FactorFlowCoefficiencyFlow Direction
 UnderValveFullOPENξUnder Standard Temp.  
(in.)CvKvCv(U.S)Cv(U.k)Approx.OpenPressure KPa
22.663746221
2-1/22.410912810721
32.317220116921
4228933828321
51.847655746621
61.575087873521
81.314321675140321
101.223302726228321
12136764301360221
140.952746171516921
160.873068548716031
180.8924610818906131
200.811415133561118731
240.717573205601722231
280.723919279852344141
300.727458321262690941
320.731241365523061641
360.739539462613874841
400.748814571124783841
420.753817629665274141
480.770292822426888641

Wafer Dual Plate Check Valve

Class 150 Dimension

  • Cast Steel Check Valve, Wafer Ends, Dual Plates
  • Spring Loaded, Horizontal or Vertical Lines
  • Designed to API594.API6D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL150
Dual Plate Check Valve 10

Class 150 Dimension

      STUD/BOLTING DETAILS
SIZE (in.)LD1D2W.T(kg)D3NO.DIA.LENGTH
        inmmRFRTJ Unit:mm
1-1/260833845298.541/2M14130145
26010351562120.545/8M16140155
2-1/26712265733139.545/8M16150165
37313580884152.545/8M16160175
4731731021086190.585/8M16170185
586195127132821683/4M20190205
69822015216012241.583/4M20205220
812727720321025298.583/4M20240255
1014633725426638362127/8M24270285
1218140730531052432127/8M24310325
1418444835035580476121M27325340
16191512400405115540161M27340355
18203547450455138578161-1/8M30365380
20219604500505162635201-1/8M30385400
24222715600605330749.5201-1/4M33405420
26222722633650360744.5363/4M20365
28305773700700380795.5403/4M20455
30305824746750420846443/4M20455
32305878796800260900483/4M20460
363689838748946301009.5447/8M24540
4043210909769858701120.5441M27620
424321142105010559601171.5481M27625
4443211931070107011401222521M27630
4852413021200120514001335441-1/8M30740
5459114601312131522401492441-1/8M30820
5659115121360137028301543601-1/8M30820
6066016281458147032001662521-1/4M33900

 

 

Dual Plate Check Valve 11

Class 300 Dimension

  • Cast Steel Check Valve, Wafer Ends, Dual Plates
  • Spring Loaded, Horizontal or Vertical Lines
  • Designed to API594,API6D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL300

 

Class 300 Dimension

      STUD/BOLTING DETAILS
SIZE (in.)LD1D2W.T(kg)D3NO.DIA.LENGTH
        inmmRFRTJ Unit:mm
2601105158312785/8M16155175
2-1/2671286573414983/4M20175195
37314780886168.583/4M20190210
473179102108820083/4M20195215
5862141271321223583/4M20215235
69824915216018270123/4M20230250
812730520321030330127/8M24280300
1014635925426650387.5161M27315335
1218142030531075451161-1/8M30365385
14222483350355115514.5201-1/8M30410430
16232537400405190571.5201-1/4M33435455
18264594450455200628.5241-1/4M33475495
20292652500505260686241-1/4M33510535
24318772600608410813241-1/2M39x3560585
26356767633640560803321-1/4M33625
28368821685685580857361-1/4M33635
30368882735740660921361-3/8M39x3650
32368936784784970978321-1/2M39x3675
36483104487388010101089321-5/8M42x3800
40546114697698514201191401-5/8M42x3885
4256811961035104515401244.5361-3/4M45x3920
4862913651166119022501416401-718M48x31010
5471815261312131531001578481-718M48x31140
6083817041458147043101764402-1/4M56x31280
*26″and larger are available with ASMEIANSIB16.47end flanges,either Style A or Style B(formerly MSS SP-44 and API605).

 

Class 600/900 Dimension

  • Cast Steel Check Valve, Wafer Ends, Dual Plates
  • Spring Loaded, Horizontal or Vertical Lines
  • Designed to API594,API6D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL600/900

 

 

Dual Plate Check Valve 12
Class 600 Dimension
      STUD/BOLTING DETAILS
SIZE (in.)LD1D2W.T(kg)D3NO.DIA.LENGTH
        inmmRFRTJ Unit:mm
26011051584127.085/8M16175180
2-12671286573514983/4M20195200
37314780888168.583/4M20210215
4791911021081121687/8+M24235240
51052391271362026781M27280285
613626415216225292121M27320325
816531820021250349121-1/8M30370375
1021339825026690432161-1/4M33440445
12229455305312140489201-1/4M33460465
14273490337355220527201-3/8M36x3520525
16305562387400360603201-1/2M39x3575580
18362610438450380654201-5/8M42x3650655
20368680489500510724241-5/8M42X3670680
24438786591600830838241-7/8M48x3780795

 

 

Class 900 Dimension
      STUD/BOLTING DETAILS
SIZE (in.)LD1D2W.T(kg)D3NO.DIA.LENGTH
        inmmRFRTJ Unit:mm
27014051588165.087/8M24225230
2-1/283162657310190.581M27250255
383165809014190.587/8M24240245
41022041021082023581-1/8M30285290
511024512713630279.581-1/4M33310315
615928615016240317.5121-1/8M30365370
820635620021280393.5121-3/8M36x3440445
10241432250266140470161-3/8M36x3490495
12292495305312220533.5201-3/8M36x3560565
14356518337355350559201-1/2M39x3645655
16384572387400470616201-5/8M42X3685695
18451635438450600686201-7/8M48x3790805
20451695487496820749.5202M52X3810825
244958355916001050901.5202-1/2M64x3945965
*26″and larger are available with ASME/ANSIB16.47 end flanges,either Style Aor Style B(formerly MSS SP-44and API 605).

 

Dual Plate Check Valve 13

Class 1500 Dimension

  • Cast Steel Check Valve, Wafer Ends, Dual Plates
  • Spring Loaded, Horizontal or Vertical Lines
  • Designed to API594,API6D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL 1500

 

 

Class 1500 Dimension

      STUD/BOLTING DETAILS
SIZE (in.)LD1D2W.T(kg)D3NO.DIA.LENGTH
        inmmRFRTJ Unit:mm
27014051588165.087/8M24225230
2-1/283162657310190.581M27250255
38317280901820381-1/8M30270275
410220710210825241.581-1/4M33310315
51102521271365029281-1/2M39x3370375
615928015016265317.5121-3/8M36x3430440
8206350200212130393.5121-5/8M42x3510520
10248433254266210482.5121-7/8M48x3600610
12305518305312380571.5162M52x3695715
14356576337355550635162-1/4M56x3775800
16384639387400630705162-1/2M64x3850880
18468701430438790774.5161-3/4M70x3955985
205337534784871270832163M76x310651095
245598975705782710990.5163-1/2M90x311701205
*26″and larger are available with ASMEIANSIB16.47end flanges,either Style Aor Style B(formerly MSSSP-44 and API605).

 

 

Lug Dual Plate Check Valve

Class 150 Dimension

  • Cast Steel Check Valve, Wafer Ends
  • Dual Plates, Fully Lugged, Spring Loaded
  • Horizontal or Vertical Lines
  • Designed to AP594,API6D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL 150

 

 

Dual Plate Check Valve 14

Class 150 Dimension

         STUD/BOLTING DETAILS 
SIZE (in.)LD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
       inmm in.mmRFRJ 
260120.592515643/41945/8M16140155 
2-1/267139.51056575.53/41945/8M16150165 
373152.5127808873/41945/8M16160175 
473190.5157102108113/41985/8M16170185 
586216186127132157/82283/4M20190205 
698241.5216152160197/82283/4M20205220 
8127298.8270203210367/82283/4M20240255 
101463623242542666112512718M24270285 
12181432381305310119125127/8M24310325 
141844764133503551311-1/829121M27325340 
161915404704004051801-1/829161M27340355 
182035785334504552031-1/432161-1/8M30365380 
202196355845005052751-1/432201-1/8M30385400 
24222749.56926006053141-1/435201-1/4M33405420 
28305795.576270070091071822403/4M20455 
3030584681374675010257/822443/4M20455 
32305900864796800134471822483/4M20460 
363681009.59728989101536125447/8M24540 
424321171.511301050105523101-1/829481M27625 
48524133512891200120533641-1/432441-1/8M30740 
*26″and larger are available with ASME/ANSIB16.47end flanges,either Style Aor Style B (formerly MSS SP-44 and API605).

 

 

Dual Plate Check Valve 15

Class 300 Dimension

  • Cast Steel Check Valve, Wafer Ends
  • Dual Plates, Fully Lugged, Spring Loaded
  • Horizontal or Vertical Lines
  • Designed to AP594,API6D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL300

 

 

Class 300 Dimension

         STUD/BOLTING DETAILS 
SIZE (in.)LD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
       inmm in.mmRFRJ 
26012792515863/41985/8M16155175 
2-1/267149105657377/82283/4M20175195 
373168.51278088107/8083/4M20190210 
473200157102108167/82283/4M20175215 
586235186127132297/82283/4M20215235 
698270216152160327/822123/4M20230250 
812733027020321055125127/8M24280300 
10146387.5324254266821-1/829161M27315335 
12181451381305310921-1/432161-1/8M30365385 
14222514.54133503552511-1/432201-1/8M30410430 
16232571.54704054053421-3/835201-1/4M33435455 
18264628.55334554553911-3/835241-1/4M33475495 
202926865845055055361-3/835241-1/4M33510535 
243188136926086088331-5/841241-1/2M39560585 
3036892184573574013951-1/238361-3/8M36650 
364831089101087388018621-3/445321-5/8M42800 
42568124511681035104538611-7/848361-3/4M45920 
4862914161327117911904370251401-7/8M481010 
*26″and larger are available with ASMEIANSIB16.47end flanges,either Style Aor Style B(formerlyMSS SP-44 and API605).

 

 

Class 600/900 Dimension

  • Cast Steel Check Valve, Wafer Ends
  • Dual Plates, Fully Lugged, Spring Loaded
  • Horizontal or Vertical Lines
  • Designed to AP1594.API6D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL600/900

 

 

Dual Plate Check Valve 16
Class 600 Dimension
         STUD/BOLTING DETAILS 
SIZE (in.)LD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
       inmm in.mmRFRJ 
2601279251586.53/41985/8M16175180 
2-1/267149100657387/82283/4M20195200 
3731681278088107/82283/4M20210215 
4792161571021082112587/8M24235240 
5105266.5186127136411-1/82981M27280285 
6136292216152162571-1/829121M27320325 
8165349270200212941-1/832121-1/8M30370375 
102134323242502661641-3/835161-1/4M33440445 
122294893813053122131-3/835201-1/4M33460465 
142735274133373553431-1/238201-3/8M36520525 
163056034703874004761-5/841201-1/2M39575580 
183626545334384506851-3/444201-5/8M42650655 
203687245844895009081-3/444241-5/8M42670680 
244388386925916001088252241-7/8M48780790 

 

 

Class 900 Dimension
         STUD/BOLTING DETAILS 
SIZE (in.)LD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
       inmm in.mmRFRJ 
270165.19251581312687/8M24225230 
2-1/283190.51056573181-1/82981M27250255 
383190.512780902112687/8M24240245 
4102234.9157102108361-1/43281-1/8M30285290 
5110279.4186127136651-3/83581-1/4M33310315 
6159317.5216150162921-1/432121-1/8M30365370 
8206393.72702002121741-1/239121-3/8M36440445 
10241469.93242502662641-1/239161-3/8M36490495 
12292533.43813053122111-1/239201-3/8M36560565 
14356558.84133373556121-5/842201-1/2M39645655 
16384615.94703874007121-3/445201-5/8M42685695 
18451685.85334384501160251201-7/8M48790805 
20451749.358448749615682-1/854202M52810825 
24495901.769259160018812-5/867202-1/2M64945965 

 

 

Dual Plate Check Valve 17

Class 1500 Dimension

  • Cast Steel Check Valve, Wafer Ends
  • Dual Plates, Fully Lugged, Spring Loaded
  • Horizontal or Vertical Lines
  • Designed API594.API6D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL1500

 

 

Class 1500 Dimension

         STUD/BOLTING DETAILS 
SIZE (in.)LD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
       inmm in.mmRFRJ 
270165.15892511412687/8M24225230 
2-1/283190.57310565191-1/82981M27250255 
383203.29012780251-1/43281-1/8M30270275 
4102241.3108157102431-3/83581-1/4M33310315 
5110292.1136186127721-5/84281-1/2M39370375 
6159317.51622161501011-1/239121-3/8M36430440 
8206393.72122702002401-3/445121-5/8M42510520 
10248482.6266324254306251121-7/8M48600610 
12305571.53123813055412-1/854162M52695715 
143566353554133379322-3/861162-1/4M56775800 
16384704.84004703879802-5/867162-1/2M64850880 
*26″and larger are available with ASME/ANSIB16.47end flanges,either Style A or Style B(formerly MSS SP-44 and API605).

 

 

Flanged Dual Plate Check Valve

Class 150/300 Dimension

  • Cast Steel Check Valve, Double Flanged Ends
  • Dual Plates, Spring Loaded
  • Horizontal or Vertical Lines
  • Designed to API594.API6D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL150/300

 

 

Dual Plate Check Valve 18

Class 150/300 Dimension

CLASS 150 DIMENSION
         STUD/BOLTING DETAILS
SIZE (in.)LD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
       inmm in.mmRFRJ 
8127343298.5203270210637/82283/4M20120135
1014640636225432426693125127/8M24135150
12181483432305381310170125127/8M24135150
141845334763504133551991-1/829121M27145160
161915975404004704052461-1/829161M27155170
182036355784505334552901-1/432161-1/8M30165180
202196996355005845053481-1/432201-1/8M30170185
24222813749.56006926053961-1/435201-1/4M33185200
28305837795.570076270012707/822403/4M20205 
3030588784674681375019877/822443/4M20210 
3230594190079686480029257/822483/4M20225 
3636810571009.58989729101430125447/8M24250 
4243212261171.510501130105523771-1/829481M27275 
485241392133512001289120541741-1/432441-1/8M30305 
CLASS 300 DIMENSION
         STUD/BOLTING DETAILS
SIZE (in.)LD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
838112733020321027078125127/8M24155175
10445146387.52542663241151-1/829161M27175195
125211814513053103812421-1/432161-1/8M30185205
14584222514.53503554133601-1/432201-1/8M30195215
16648232571.54004054704891-3/835201-1/4M33205225
18711264628.54504555335581-3/835241-1/4M33210230
207752926865005055847661-3/835241-1/4M33215230
2491431881360060869211901-5/841241-1/2M39250265
3099136892173574084519961-1/2383691-3/8M36290 
3611724831089873880101026601-3/445321-5/8M42325 
421334568124510351045116855151-7/848361-3/4M45360 
48151162914161179119013276239251401-7/8M48400 

 

Dual Plate Check Valve 17

Class 600 Dimension

  • Cast Steel Check Valve, Double Flanged Ends
  • Dual Plates, Spring Loaded
  • Horizontal or Vertical Lines
  • Designed to API594.AP16D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL600

 

Class 600 Dimension

          STUD/BOLTING DETAILS 
SIZE (in.)LDD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
        inmm in.mmRFRJ 
81654193492002702121341-1/432121-1/8M30210215 
102135084322503242662341-3/835161-1/4M33230235 
122295594893053813123041-3/835201-1/4M33240245 
142736035273374163554901-1/239201-3/8M36260265 
163056866033874704006801-5/841201-1/2M39280285 
183627436544385334509781-3/444201-5/8M42295300 
2036881372448958450012971-3/444241-5/8M42310315 
244389408385916926001554252241-7/8M48350360 
*26″and larger are available with ASMEIANSIB16.47end flanges,either Style A or Style B (formerly MSS SP-44 and API605).

 

 

Class 900/1500 Dimension

  • Cast Steel Check Valve, Double Flanged Ends
  • Dual Plates, Spring Loaded
  • Horizontal or Vertical Lines
  • Designed to API594.AP16D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL900/1500

 

 

Dual Plate Check Valve 20

Class 900/1500 Dimension

CLASS 900 DIMENSION 
          STUD/BOLTING DETAILS 
SIZE (in.)LDD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
        inmm in.mmRFRJ 
8206470393.72002702122171-1/239121-3/8M36245250 
10241545469.92503242663301-1/239161-3/8M36260265 
12292610533.43053813125091-1/239201-3/8M36275280 
14356640558.83374133557651-5/842201-1/2M39295305 
16384705615.93874704008901-3/445201-5/8M42305315 
18451785685.84385334501450251201-7/8M48350365 
20451855749.348758449619602-1/854202M52370385 
244951040901.759169260023512-5/869202-1/2M64470490 
CLASS 1500 DIMENSION 
          STUD/BOLTING DETAILS 
SIZE (in.)LDD1D2D3D4W.T(kg)HOLEDIA.NO.DIA.LENGTHUnit:mm
        inmm in.mmRFRJ 
8206483393.72002702122831-3/445121-5/8M42315325 
10248585482.6254324266361251121-7/8M48365375 
12305675571.53053813126372-1/854162M52400415 
1435675063533741335510972-3/861162-1/4M56435455 
16381825704.838747040011522-5/867162-1/2M64480505 
*26″and larger are available with ASME/ANSIB16.47end flanges,either Style A or Style B(formerly MSS SP-44 and API605).

 

 

Hub Ends Dual Plate Check Valve

Class 600~2500 Dimension

  • Cast Steel Check Valve, Hub Ends
  • Dual Plates, Spring Loaded
  • Horizontal or Vertical Lines
  • Designed to API594.AP16D
Face to FaceAPI594/API 6D
Wall ThicknessASME B16.34
End FlangeNPS2~24:ASME B16.5*
ClassASME/ANSI CL600~CL2500

 

 

Dual Plate Check Valve 21

Class 600~2500 Dimension

SIZE (in.)SEAT RINGABDEFW.T(kg)
 NO.     Unit:inch
2203.634.52.065.064.55
143.634.51.165.064.55
32754.53.066.885.259
2554.52.676.885.259
2054.52.066.885.259
440652.068.13611
34653.698.13611
31653.258.13611
25652.678.13615
6629.256.256.07128.7535
529.256.255.31128.7535
469.256.254.75128.7535
409.256.254.06128.7540
88211.58.138.2514.59.8872
7611.58.137.7514.59.8872
7211.58.137.2514.59.8872
6211.58.136.0714.59.8883
5211.58.135.3114.59.8883
10H9713.639.759.8817.6312.75110
H9413.639.759.517.6312.75110
H8413.639.758.517.6312.75140
H82X13.639.758.2518.2513.5140
H7213.639.757.2518.2512.75140
H6213.639.756.0718.2512.75157
H62X13.639.756.0718.2513.5157
12M1201612.51220.2514.5177
M1121612.511.2520.2514.5177
M1021612.510.2520.2514.5228
M821612.58.2520.2514.5268
M82X1612.58.2520.515.75268
*26″and largerare availablew with ASME/ANSI B16.47 end fla es,eitherStyle A or Style B(formeerly MSS SP-44 and API605).

What is Dual Plate Check Valve?

The dual plate check valve was developed to solve issues found in traditional swing and lift check valves. It uses two spring-loaded plates attached to a central hinge screw. As the flow decreases, the torsional spring action closes the plates before the flow can reverse.
 
This design prevents water hammer and ensures a non-slam operation. These features make the dual plate check valve a highly effective and efficient option, often called a “silent check valve.”

Dual-Plate Check Valve Classification

By Body Structure
Retainer-less construction ensures that the valve body is not fully drilled to fit the hinge-pin and stop-pin in a dual-plate check valve. Instead, a recess is machined. This design enhances the integrity of the valve, especially at high pressure, reducing the risk of body leaks.
By End Connection Type

Lug

Lugged type flange connections are similar to wafer types but with some differences. The lug holes are drilled so that each bolt hole on the flanges has a corresponding lug hole. Each threaded hole holds two bolts, one from each flange on opposite sides.
This setup allows for dead-end operation, where only one side of the valve is connected to a flange, and the other side is exposed to the environment, as long as the seat or retainer is securely screwed in place.
 

Wafer

In a wafer attachment, the valve is placed between the pipe flanges, and the bolts from the flanges hold it in place. Some wafer valves have centering holes to make sure they are positioned correctly between the flanges. This type of valve is the lightest option for installing between pipe flanges, making it more affordable than other types of valves.
 

Flange

The valve has a flanged end connection with bolt holes to secure the flanges to the shaft. Flanged attachments make it easier to remove and repair the valve. They are commonly used in larger valve sizes. Gaskets are necessary where the flanges connect to ensure a proper seal.
 

Butt Weld

The valve and pipe ends have the same diameter. The outer edges of both are machined to create a “valley” that is filled with welding metal. The two parts are welded together around the rims, as shown in the image. Butt welding connections are typically used for smaller diameters, usually 2 inches and below.
By Sealing Method

Soft Seal

A soft seal means that one of the sealing parts is made from low-hardness materials. Typically, the soft seal seat is made from non-metallic materials that have a certain strength, hardness, and can tolerate high temperatures to ensure zero leakage. However, compared to metal seal valves, soft seal valves have a shorter service life and less temperature resistance.
 
Although some vendors claim that their hard seal valves can achieve zero leakage, the sealing performance is generally not as strong as that of soft seal valves. However, soft seal valves may not meet the technical requirements for corrosion resistance in certain corrosive environments.
 

Metal Seal

Both ends of the sealing pair in a hard seal valve are made of metal or other high-hardness materials. This makes the valve a hard seal or metal-to-metal seal valve. While hard seal valves may have lower sealing performance compared to soft seals, they offer higher temperature tolerance, better corrosion resistance, and stronger mechanical properties.
 
The materials used can include steel paired with steel, copper, graphite, or alloy steel. The valve components might be made from cast iron, cast bronze, alloy steel, bead welding alloy, or sprayed alloy.

How Does Dual Plate Check Valve Work?

The valve plate opens when fluid pressure flows in one direction. If the fluid flows from the opposite direction, the plate impacts the valve seat, cutting off the flow. The reduced flow allows the torsion spring to close the plate, preventing any reversal in fluid flow.
 
The valve has a cylindrical body, which offers a more even stress distribution compared to other valve designs. This cylindrical construction is built to handle heavy loads and the weight or thickness of the valve. As a result, under demanding loading conditions, this valve provides a clear advantage in terms of safety and cost-effectiveness.

Features and Benefits of Dual Plate Check Valve

Features of Dual Plate Check Valve

Low Pressure Drop

Pressure drop in a dual plate check is very low as compared to other check valves.
 

Spring-Assisted Closing Mechanism

Each plate, which is half the size of a swing check disc, offers a straight flow path, providing the least resistance. As a result of spring-assisted closing, the valve closure begins as soon as the flow velocity decreases below the intended minimum velocity.
 

Cushioned Closing to Reduce Slamming

The momentum produced as they travel to a closed position is just a fraction of what is developed in a swing check valve. Further, due to the spring-assisted closure, the valve shuts as the flow velocity reaches zero and until the flow reversal, cushioning the plates and the seat to reduce slamming.
 

Non-Slam Design

The two plates in the Dual Plate Check Valve are mounted vertically in the middle for horizontal installations, completely removing the influence of gravity.
Benefits of Dual Plate Check Valve

Minimal Wear and Tear

Low wear and tear of the seat as it has a design of non-slamming type.
 

Reduced Water Hammer

Water hammers are almost negligible in dual-plate check valves because valve closure does not rely on backpressure and backflow.

Applications of Dual Plate Check Valve

Versatility Across Material and System Configurations

A dual plate check valve is the most suitable type of check valve that can be used for almost any configuration of material and system parameters.

Water System Applications

Typical applications include water systems like boilers, potable water, fire safety systems, cooling & heating water systems, etc.

Petrochemical Applications

Used in offshore/onshore applications, LPG, LNG, lube oil, cryogenics, etc., within the petrochemical industry.

Hydrocarbon Applications

Suitable for almost all hydrocarbon-related applications.

Air and Gas Applications

Applicable in air and gas systems involving chlorine, hydrogen, nitrogen, carbon dioxide, oxygen, etc.

Metallurgical and Chemical Applications

Widely used in industries like sugar, pharmaceuticals, paper, cement, steel, aluminum, copper, zinc, and more.

Installation Instructions

Cleaning the Valve
The end connections of the Dual Plate Check Valves are secured by rust-proof oil. Clean the same before installation. Valve plates should be tested to verify that they are free of rust/oil.
Checking the Direction of Flow
The direction of flow in the line should match the direction of flow marked by the ‘arrow’ on the valve body and as indicated on the nameplate.
Horizontal Piping Installation
Insert the valve into the conduit such that the Pin Retainers (Plugs) are positioned up and down.
Installation Distance between Check Valve and Butterfly Valve
Ensure sufficient space between the Dual Plate Check Valve and the Butterfly Valve so that the plates of the Dual Plate Check Valve are in an open position and the Butterfly Valve disc does not touch the Dual Plate Check Valve. Also, ensure adequate distance to prevent any peripheral or irregular flow conditions.
Valve Orientation to Pump’s Discharge
When fitting the Dual Plate Check Valve to the pump, ensure that the pump flow follows the two plates of the valve for better output.
Optimal Flow Velocity
Valves are configured to operate optimally open at a line flow rate of 2 to 2.7 m/sec of water for horizontal installations. The flow velocity for vertical installation can be marginally higher. For fluids with less specific gravity, specify at the time of enquiry.
Cyclic Flow Applications
Refer to the manufacturing company for cyclic flow applications such as the outlet of reciprocating machines.
Uniform Flow Velocity Installation
Dual Plate Check Valves should be mounted where the flow velocity around the cross-section is uniform.

Differences Between Dual Plate Check Valve And Swing Check Valve

Weight and Handling

Dual plate check valves are lightweight and easy to handle, whereas swing check valves are comparatively bulky, requiring a heavier handling and support system.

Structural Design

The structure of the dual plate check valve is compact and well-designed, while the swing check valve has a complex body shape, making it difficult to assess stress points for critical applications.

Installation Orientation

Dual plate check valves can be installed in both horizontal and vertical directions, while swing check valves are primarily suitable for horizontal applications.

Spring-Assisted Closure

Dual plate check valves, with their spring-assisted closure, can be installed for upside-down flow, a feature not possible with swing check valves.

Pressure Drops and Energy Losses

Pressure drops and energy losses are lower in dual plate check valves compared to swing check valves, regardless of pressure ratings.

Non-Slamming Design

Dual plate check valves have a non-slamming design, whereas swing check valves require an external device to counteract the slamming effect.

Water Hammering

Dual plate check valves experience negligible water hammering, unlike swing check valves.

Maintenance Requirements

Swing check valves require regular maintenance of the seat and hinges due to impact loads and wear from rubbing, while dual plate check valves offer a long life and trouble-free operation.

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Specifications of Dual Plate Check Valve

Body and Disc Material
The Dual Plate Check Valve features a body made from high-grade stainless steel and discs crafted from high-strength alloy steel. This combination provides excellent strength and resistance to rust and corrosion. It performs well in various environments, including high temperatures and pressures. The durable materials result in a long lifespan, minimizing the need for replacements and providing reliable performance.
End Connections
Dual Plate Check Valves come with flanged, wafer, or lug end connections. Flanged connections allow for easy installation and maintenance. Wafer types fit between flanges, saving space, while lug types are ideal for systems needing frequent disassembly. The choice of end connection depends on the specific application needs.
Design Features
The valve boasts a compact and lightweight design, facilitating easy installation. It includes dual plates that open and close swiftly to prevent backflow. Think about it – this design also minimizes water hammer, a common issue in piping systems. NTVAL builds each valve with precision for dependable performance.

Features of Dual Plate Check Valve

Anti-Slam Functionality

The anti-slam feature of Dual Plate Check Valves prevents the valve from slamming shut during flow stoppages. A spring mechanism controls the closing speed of the plates. This protects the piping system from shock waves and vibrations. No wonder this feature is essential in systems with sudden flow changes.

Dual Plate Mechanism

The NTVAL Dual Plate Check Valve uses a dual plate mechanism that provides better sealing compared to single plate designs. This mechanism evenly distributes pressure, reducing wear and tear. It also minimizes leakage risk, offering a dependable seal. This feature contributes to the valve's durability and performance.

Minimal Maintenance

Dual Plate Check Valves require minimal maintenance due to their simple design. The structure allows easy access to internal components, making inspections straightforward. This reduces downtime and maintenance costs. It's an efficient choice for long-term use in various industries.

Benefits of Dual Plate Check Valve

Reduced Water Hammer

One of the key benefits of Dual Plate Check Valves is their ability to reduce water hammer. The design of the valve allows for smoother operation, with the dual plates closing quickly yet softly when the flow stops. This helps to minimize the shock and noise associated with water hammer, protecting the piping system from potential damage. The reduction in water hammer contributes to the longevity of the system.

Enhanced System Efficiency

The Dual Plate Check Valve helps improve system efficiency. Its low-pressure drop design allows fluids to flow smoothly with minimal resistance. This reduces energy consumption, making the system more cost-effective to operate. For example, the valve's efficient design supports overall system performance.

Reliable Backflow Prevention

This valve provides reliable backflow prevention. For example, the quick response of the dual plates stops backflow immediately, protecting the system from damage. This benefit is crucial for maintaining the integrity of various industrial processes. Consistent backflow prevention helps avoid costly repairs and downtime.

Applications of Dual Plate Check Valve

Oil and Gas Industry

The oil and gas industry relies on Dual Plate Check Valves for their pipelines. These valves can withstand high pressure and harsh conditions common in this industry. They prevent backflow and maintain the smooth operation of pipelines. Yes, you read that right, NTVAL’s high-quality valves are trusted for their durability and performance in oil and gas applications.

Power Generation

Power generation plants use Dual Plate Check Valves to manage the flow of steam, water, and other fluids. The valve’s low pressure drop design enhances system efficiency, which is crucial for power production. It also prevents backflow, protecting turbines and other equipment. This makes the valve an essential component in power generation systems.

Chemical Processing Plants

In chemical processing plants, the Dual Plate Check Valve plays a crucial role. It handles aggressive chemicals without corroding or failing. The valve’s quick response prevents backflow, protecting sensitive equipment and maintaining process integrity. Its durable design supports safe and efficient chemical processing operations.
Dual Plate Check Valve 22
Dual Plate Check Valve 23

3 Considerations When Buying Dual Plate Check Valve

01

Stainless Steel

When buying a Dual Plate Check Valve, consider the materials used. NTVAL’s high-grade stainless steel and alloy steel are excellent choices for durability and corrosion resistance. Turns out, the right materials make the valve perform well in various environments and last longe

02

Environmental Impact

Considering the environmental impact of a valve’s materials and operation is important. Valves made from eco-friendly materials or designed to lower energy consumption contribute to sustainability. This is crucial for industries aiming to reduce their environmental footprint. Selecting a valve with lower environmental impact supports sustainability goals.

03

Certification API607

The valve meets the API607 certification for fire safety. This certification guarantees that the valve can withstand fire conditions, providing added safety to the system. Valves with API607 certification are tested for fire resistance and reliability. Choosing a valve with this certification demonstrates compliance with safety standards and enhances system protection.

Summary

The dual plate check valve, also known as the zero velocity valve, addresses the shortcomings of traditional check valves. It is highly effective, versatile for any fluid and service conditions, easy to manage, and can be installed in any pipe structure without restrictions.

Frequently Asked Questions

Yes, there are versions of the Dual Plate Check Valve specifically designed for cryogenic conditions.
Yes, NTVAL’s Dual Plate Check Valves are designed for versatile installation, allowing them to be used in both horizontal and vertical orientations.
Yes, a reliable supply of spare parts is available, making it easy to maintain the valves throughout their service life.

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