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Swing Check Valve

Our selection of high-performance swing check valves offer flanged and threaded solutions in multiple body materials to suit your positive backflow prevention needs. Talk to us for more info.


ViNtrol Series 32 Threaded Swing Check Valve

The rugged Sereis 32 threaded swing check valve features carbon steel or ductile iron construction and utilizes a trough-style design that eliminates leak path and allows for quick repair. Suitable for horizontal and vertical upflow service. Additional testing methods available upon request, including fugitive emissions, cryogenic, high-pressure nitrogen/gas, vacuum, sulfide stress cracking and hydrogen-induced cracking testing.

  • Features
  • Rugged carbon steel/ductile iron body and bonnet
  • Stainless steel disc standard
  • Integral resilient seat
  • Line-pipe connections
  • NACE trim standard
  • Custom modifications, overlays and coatings available
  • Specifications
  • Size: 1"–4" (sizes may vary by class)
  • Class: 750–2000
  • API 6D
  • API 6FA
  • API 607
  • API 598
  • ASME B16.10
  • ASME B16.5
  • MSS-SP-45
  • MSS-SP-53
  • MSS-SP-54
  • MSS-SP-55
  • MSS-SP-59
  • MSS-SP-93
  • MSS-SP-94
  • BS 6755 Parts I/II
  • ISO 9001:2000
  • NACE MR0175

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ViNtrol Series 35, 35A Flanged Swing Check Valve

ViNtrol Series 35 (API 6D) and 35A (API 6A) flanged swing check valves feature a shaft-style full open design with bubble-tight performance. Available in resilient and metal-to-metal seating with standard NACE construction and fire-safe design. Shaft-style construction enables a complete range of external options, including lock-open, spring-close and water hammer prevention. Additional testing methods available upon request, including fugitive emissions, cryogenic, high-pressure nitrogen/gas, vacuum, sulfide stress cracking and hydrogen-induced cracking testing.

  • Features
  • Rugged carbon steel body
  • Bolted and threaded bonnet with tap and plug
  • Stainless steel disc standard
  • Integral or replaceable seats available
  • API 6D and API 6A flanges
  • Piggable
  • NACE trim standard
  • Replaceable stainless steel trim offers exceptional corrosion protection
  • Custom modifications, overlays and coatings available
  • Specifications
  • Size (Series 35): 2"–16" (sizes may vary by class)
  • Size (Series 35A): 2"–4"
  • Class (Series 35): 150–1500
  • Class (Series 35A): 2000, 3000, 5000
  • API 6A
  • API 6D
  • API 6FA
  • API 607
  • API 598
  • ASME B16.10
  • ASME B16.5
  • MSS-SP-45
  • MSS-SP-53
  • MSS-SP-54
  • MSS-SP-55
  • MSS-SP-93
  • MSS-SP-94
  • BS 6755 Parts I/II
  • ISO 9000:2001
  • NACE MR0175

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Williams Cast Steel Swing Check Valves

Williams cast steel swing-style check valves utilize a pressure seal design with an optional outside lever and weight or spring. Alternate trim materials also available.

  • Features
  • Seal-welded seats
  • Bosses for taps and bypass
  • Graphite packing
  • Fugitive emissions tested
  • Specifications
  • Size: 2"–36" full port (FP)
  • Class: 150–2500
  • BS 1868
  • ANSI B16.34
  • ANSI B16.10
  • ANSI B16.5
  • ANSI B16.25
  • ANSI B16.47
  • API 598
  • MSS-SP-25
  • NACE MR0175

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Williams Forged Steel Swing Check Valves (Flanged)

Williams forged steel swing-style check valves with flanged end connections utilize integral or welded flanges and feature a two-piece, self-aligning packing gland. Welded seats, alternate trim and body materials are available upon request.

  • Features
  • Integral or welded flanges
  • Two-piece, self-aligning packing gland
  • Captured graphite spiral-wound gasket
  • Integral backseat
  • Specifications
  • Size: 1/2"–2"
  • Class: 150–600
  • API 602
  • API 598
  • BS 5352
  • ANSI B16.34
  • ANSI B16.5
  • MSS-SP-25
  • NACE MR0175



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Williams Forged Steel Swing Check Valves

Williams forged steel swing-style check valves feature threaded or socket-weld end connections as well as options for conventional and full port bore designs. Alternate trims, body materials and welded seats also available.

  • Features
  • Conventional port (full port optional)
  • Spring available upon request
  • Bolted bonnet with spiral-wound gasket
  • Socket-weld ends
  • Threaded ends (NPT)
  • Specifications
  • Size: 3/8"–2"
  • Class: 800, 1500
  • API 602
  • API 598
  • ANSI B6.11
  • ANSI B1.20.1
  • ANSI B16.34
  • BS 5352
  • MSS-SP-25
  • NACE MR0175



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Williams Stainless Steel Swing Check Valve (Flanged)

Williams stainless steel swing-style check valves with flanged end connecitons feature rugged teflon or graphite packing and gaskets and offer an option for buttweld ends. Further options for an API 600 heavy wall, soft seats and an outside lever and weight also available.

  • Features
  • Teflon or graphite packing and gaskets
  • Fugitive emissions tested
  • Totally contained round bonnet gaskets
  • Specifications
  • Size: 1/2"–24" full port (sizes may vary by class)
  • Class: 150–600
  • BS 1868
  • ANSI B16.34
  • ANSI B16.10
  • ANSI B16.5
  • ANSI B16.25
  • API 594
  • API 598
  • MSS-SP-25

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Williams Forged Steel Swing Check Valves

These versatile Williams swing check valves feature a forged steel body design available in conventional and full port configurations. Alternate trim, body materials and welded seat options also available.

  • Features
  • Conventional and full port configurations
  • Bolted bonnet with spiral-wound gasket
  • Socket-weld and threaded end connections
  • Spring available on request
  • Specifications
  • Size: 3/8"–2" full port (FP)
  • Class: 800, 1500
  • API 602
  • API 598
  • BS 5352
  • ANSI B16.34
  • ANSI B1.20.1
  • ANSI B6.11
  • NACE MR0175

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