A check valve, clack valve, non-return valve, reflux valve, retention valve or one-way valve is a valve that normally allows fluid to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items.
A swing valve is a check valve in which the disc, the movable part to block the flow, swingson a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle.
OGV Swing Check Valves are quiet operating valves that effectively prevent backflow. The “flapperless” design is gentle on the seat as the piston rises and lowers with increased and decreased flow rates.
Standard Specifications
Basic Design |
API 6D/BS 1868 |
Face-to-Face Dimension |
ANSI B16.10 |
Flange End Dimension |
ANSI/ASME B16.5 (1” to 24”) |
ANSI/ASME B16.47 (26” & up) |
Butt-Weld End Dimension |
ANSI/ASME B16.25 |
Inspection & Testing |
API 598 |
Swing Check Valve Expanded View

Bill of Material
No. |
Part Name |
Material |
1 |
Body |
A216 WCB |
A352 LCB |
A351 CF8M |
A217 WC6 |
2 |
Nut |
A194 2H |
A194 7 |
A194 8M |
A194 4 |
3 |
Bolt |
A193 B7 |
A320 L7 |
A193 B8M |
A193 B16 |
4 |
Disc |
A216 WCB+13Cr |
A352 LCB+13Cr |
A351 CF8M |
A217 WC6+STL |
5 |
Pin |
A182 F6a |
A182 F6a |
SS 316 |
A182 F6a |
6 |
Arm |
A216 WCB |
A352 LCB |
A351 CF8M |
A216 WCB |
7 |
Hinge Pin |
A182 F6a |
A182 F6a |
SS 316 |
A182 F6a |
8 |
Yoke |
A216 WCB |
A352 LCB |
A351 CF8M |
A217 WC6 |
9 |
Hex Bolt |
Carbon Steel |
Carbon Steel |
SS 316 |
Carbon Steel |
10 |
Gasket |
304+Graphite |
304+Graphite |
316+Graphite |
304+Graphite |
11 |
Cover |
A216 WCB |
A352 LCB |
A351 CF8M |
A217 WC6 |
12 |
Lifting Lug |
Carbon Steel |
Carbon Steel |
Stainless Steel |
Carbon Steel |
13 |
Nut |
A193 B7 |
A320 L7 |
A193 B8M |
A193 B16 |