Duo Butterfly Check Valves

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Duo Butterfly Check Valves

  • Check valves are used in pipelines for water supply and sewerage systems, and they play a role in protecting the pump or equipment on the pipeline by blocking the reverse flow that occurs when the pump stops operating.
  • Compared to the existing swing type check valve, the face-to-face distance is shorter, so there are fewer restrictions on the installation space.
  • According to the user's request, it is possible to apply a fully-closing check valve with a dash-pot attached to prevent abrupt closing due to backflow.
  • Bypass valve or weight can be applied according to the user's requirement.
  • The maintenance of the valve is easy because the inspection hole is attached.
Standard
  • 500㎜ ~ 2,000㎜ (※ Small diameters of 500㎜ or less and large diameter of 2,000㎜ or more can be manufactured according to customer requirements.)
Working Pressure
  • Type 1 : 0.44MPa (4.5㎏/㎠)
  • Type 2 : 0.74MPa (7.5㎏/㎠)
  • Type 3 : 0.98MPa (10㎏/㎠)
  • High pressure of up to 1.57MPa(16㎏/㎠) or higher is possible according to customer's request.
Valve Joint Part
  • Flange type, standard specifications are KS D3578, KS B 1511, and other specifications are applicable according to customer's request.
Working Fluid
  • Freshwater and seawater

Main part material

No Part Name Material KS
1 Body Ductile Iron GCD450
Steel Structure SS400
Stainless Steel Casting SSC13
Steel Casting SC410
2 Disc Ductile Iron GCD 450
Steel Structure SS400
Stainless Steel Casting SSC13
Steel Casting SC410
3 Body seat Stainless Steel STS304
Bronze casting BC6
4 Disc seat Rubber goods for water works NBR/EPDM
5 Valve seat Stainless Steel STS304

External Dimensions

Directly Closed
Fully Closed
Duo Check Valves Dimensions / Unit : mm
Nominal Diameter L Flange *A1 *A2
(Fully Closed)
*A3
(Directly Closed)
*H1 X Y n-ØH
ØD ØC ØG n-Øh T × f
500 530 706 620 582 20-27 28 × 3 430 530 510 400 500 160 4-23
600 560 810 725 682 20-30 30 × 3 500 620 590 450 600 180 4-23
700 610 928 840 797 24-30 32 × 3 610 700 660 600 640 200 4-23
800 690 1034 950 904 24-33 34 × 3 670 750 710 550 800 230 4-23
900 740 1156 1050 1004 28-33 36 × 3 730 790 750 600 900 240 4-27
1000 770 1262 1160 1111 28-36 38 × 3 820 840 800 650 1000 250 4-27
1100 800 1366 1270 1200 32-36 41 × 3 950 950 910 700 1100 260 4-27
1200 820 1470 1387 1304 32-36 43 × 3 950 1040 1000 750 1080 270 4-27
1350 850 1642 1552 1462 36-40 45 × 3 1060 1210 1160 825 1350 280 4-33
1500 900 1800 1710 1462 36-40 48 × 3 1150 1330 1280 920 1500 300 4-33
1600 920 1915 1820 1760 40-40 53 × 3 1270 1440 1380 970 1600 300 4-33
1650 920 1950 1870 1770 40-40 53 × 3 1330 1510 1460 1010 1650 300 4-33
1800 950 2115 2020 1960 44-49 55 × 3 1470 1670 1590 1090 1800 300 4-33
2000 980 2325 2230 2170 48-49 58 × 4 1590 1830 1780 1150 2000 300 4-42

1. The flange is KS D 3578 F-12 standard, and other standards can be applied upon request.
2. The valve's face-to-face distance applies to the manufacturer's standard specifications.
3. * The displayed dimensions are for reference only.

㈜신정기공

Head Office / First Factory
71, Gukgasandan-daero 28-gil, Guji-myeon, Dalseong-gun, Daegu, 43008, Rep. of KOREA
Tel. +82-53-617-2332
Fax. +82-53-617-2334
E-mail. sjvco1@hanmail.net
Second Factory
26-5, Gukgasandandong-ro 42-gil, Guji-myeon, Dalseong-gun, Daegu, 43008, Rep. of KOREA
Tel. +53-617-2003
Fax. +53-617-2077
E-mail. sjvco@naver.com

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