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

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

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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.

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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

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Photos

[jdpostimage imagesrc=”https://www.pipingengineer.org/wp-content/uploads/swing-check-valve-01.jpg” imagecaption=”Swing Check Valve”][jdpostimage imagesrc=”https://www.pipingengineer.org/wp-content/uploads/swing-check-valve-02.jpg” imagecaption=”Swing Check Valve”]

Youtube Videos

 Swing Check Valve Animation

Maxbright Swing Check Valve

ABV Swing Check Valve

https://www.youtube.com/watch?v=aOOdWRg98n4