Swing Check Valve

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Swing check valve consists of a circular disc which swings on a hinge pin.  This check valve can be mounted horizontally as well as vertically. Preferred orientation is horizontal as there is tendency for disc to stay open if flow reversal occurs very slowly.

Parts of a Swing Check Valve

Swing Check Valve

Swing Check Valve

Typical materials of construction for each part

Sr. Description Material
01 Body ASTM A216 Gr. WCB
02 Body Seat Ring  ASTM A105 +HF*
03 Disc  ASTM A216 Gr. WCB + 13% Cr. Steel
04 Hinge  ASTM A216 Gr. WCB
05 Disc Washer  13% Cr. Steel
06 Disc Nut  SS 304
07 Disc Nut Pin  13% Cr. Steel
08 Hinge Pin  13% Cr. Steel
09 Gasket  ASTM A308
10 Cover  ASTM A216 Gr. WCB
11 Stud  ASTM A193 Gr. B7
12 Stud Nut  ASTM A194 Gr. 2H
Hinge Pin Cover  ASTM A105
Hing Pin Cover Bolt  ASTM A193 Gr. B7
Name Plate  SS 304
Flanged Swing Check Valve

Flanged Swing Check Valve

Butt Welding Swing Check Valve

Butt Welding Swing Check Valve

Regular swing check valve is not suitable if flow reversal is frequent as it can cause pounding and wear of disc. A composition disc is used for gritty liquids to reduce damage to the seat. An optional lever and outside weight may be offered either to assist closing or to counterbalance the disc in part, and allow opening by low-pressure fluid.

Applicable Codes and Standards

  1. BS1868 :
  2. ASME B16.34 : Pressure Temperature Ratings.
  3. ASME B16.10 : Face to face and end to end dimensions of valves.
  4. ASME B16.5 : End Flange Dimensions.
  5. ASME B16.47 : Flange dimensions for flanges larger than 24″ Series A and B.
  6. ASME B16.25 : Butt weld end dimensions.
  7. BS 6755 Part I : Valve inspection and testing.
  8. API 598 : Valve Inspection and Testing.

Body and Bonnet Materials Based on Temperature and Fluid

Material Classification ASTM Specification Working Temperature
Carbon Teel ASTM A216 Gr. WCB -29 deg C to 427 deg C (-20 deg F to 800 deg F)
 1-1/4 Cr – 1/2 mo ASTM A217 Gr. WC6 -29 deg C to 593 deg C (-20 deg F to 1100 deg F)
 2-1/4 Cr – 1 mo ASTM A217 Gr. WC9 -29 deg C to 593 deg C (-20 deg F to 1100 deg F)
 5 Cr – 1/2 mo ASTM A217 Gr. C5 -29 deg C to 649 deg C (-20 deg F to 1200 deg F)
 9 Cr – 1 mo ASTM A217 Gr. C12 -29 deg C to 649 deg C (-20 deg F to 1200 deg F)
 9 Cr – 1 mo – 1/4 V ASTM A217 Gr. C12A -29 deg C to 649 deg C (-20 deg F to 1200 deg F)
 Low-temperature Steel ASTM A352 Gr. LCB/LCC -46 deg C to 343 deg C (-50 deg F to 650 deg F)
 Austenitic Stainless Steel / 18-8 (Type-304) ASTM A351 Gr. CF8 -196 deg C to 649 deg C (-320 deg F to 1200 deg F)
 Austenitic Stainless Steel / 16Cr – 12ni – 2 mo (Type 316) ASTM A351 Gr. CF8M -196 deg C to 649 deg C (-320 deg F to 1200 deg F)

Body Gasket Materials / Type based on Rating

Rating Typical Optional
150 Spirally-wound SS 304 with Graphite filler  Spirally Wond SS 316 with Graphite Filler / Spirally wound SS 304/SS 316 with PTFE filler
300 Spirally-wound SS 304 with Graphite filler  Spirally Wond SS 316 with Graphite Filler / Spirally wound SS 304/SS 316 with PTFE filler
600  Spirally-wound SS 304 with Graphite filler Octagonal Ring Type (RTJ) metal gasket in soft iron / Octagonal Ring Type (RTJ) metal gasket in SS 304 / SS 316
900 Octagonal Ring Type (RTJ) metal gasket in soft iron  Octagonal Ring Type (RTJ) metal gasket in SS 304 / SS 316
1500  Octagonal Ring Type (RTJ) metal gasket in soft iron  Octagonal Ring Type (RTJ) metal gasket in SS 304 / SS 316

Photos

Swing Check Valve
Swing Check Valve

Youtube Videos

 Swing Check Valve Animation

Maxbright Swing Check Valve

ABV Swing Check Valve

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