The body-cover bolting conforms with ANSI B.1.1
The nuts are manufactured conform with ANSI B18.2.2

The cover material is identical to the body.
Depending on the valve size and pressure class, either a casting or a forging is used.

The hinge pin is inserted into the valve and held in position by plug.
The larger size valves are provided with bolted flanges instead of plugs.

The arm material is identical to the body.
Hinge bushing is provided in the larger valve sizes to minimize friction and eliminate seizing.

The bottom seated type seat ring is screwed into the body.
The seating surface is finished by lapping.
The forged seat ring is heat-treated to deliver the best mechanical properties and required hardness.

The disc has a sufficient seating surface area which is ground and lapped to a mirror finish.
It is of one-piece construction and is heat treated to deliver the required mechanical properties and hardness.

The cast steel body is designed with a wall thickness which is greater at any point than the minimum requirement provided by API Std.600 or API 6D. Port and seat passage dimensions conform to ANSI B16.5 Pipe Fitting. The welded-in type seat ring is standard to allow interchangeability.
The standard body-bonnet joint is male-fernale, and the flange is round for all valves.

Steel Check Valves, API 6D, JIS
Steel Check Valves, ISO 14313
Steel Valves, ASME B16.34
Face To Face, ASME B16.10, JIS
End Flanges, ASME B16.5, JIS
Buttwelding Ends, ASME B16.25
Inspection And Test, API 598/ API 6D

BB. Bolted Bonnet
Swing Type, Anti-rotation Disc
Renewable Seat Rings
Non-penetrate Disc Shaft
Horizontal Or Vertical Service
Flanged Or Buttwelding Ends
Part Name

ASTM Material
Carbon steel	1.25Cr-0.5Mo	2.25Cr-1Mo	304 Type	316 Type	304L Type	316L Type	20 Alloy
1	Body	A216 WCB	A217 WC6	A217 WC9	A351 CF8	A351 CF8M	A351 CF3	A351 CF3M	A351 CN7M
2	Bonnet	A216 WCB	A217 WC6	A217 WC9	A351 CF8	A351 CF8M	A351 CF3	A351 CF3M	A351 CN7M
3	Disc	WCB+13Cr *1	A217 WC6+HF	A217 WC9+HF	A351 CF8	A351 CF8M	A351 CF3	A351 CF3M	A351 CN7M
4	Hinge	A216 WCB	A217 WC6	A217 WC9	A351 CF8	A351 CF8M	A351 CF3	A351 CF3M	A351 CN7M
5	Arm	A216 WCB	A217 WC6	A217 WC9	A351 CF8	A351 CF8M	A351 CF3	A351 CF3M	A351 CN7M
6	Sear Ring	A105+13Cr *1	A182 F11+HF	A182 F22+HF					NA
7	Hinge Pin	A276 410	A276 410	A276 410	A276 304	A276 316	A276 304L	A276 316L	20-Alloy
8	Disc Washer	Carbon steel	A276 410	A276 410	A276 304	A276 316	A276 304L	A276 316L	20-Alloy
9	Disc Nut	Carbon steel	A276 410	A276 410	A276 304	A276 316	A276 304L	A276 316L	20-Alloy
10	Disc Nut Pin	304 SS	304 SS	304 SS	304 SS	316 SS	304L SS	316L SS	20-Alloy
11A	Bonnet Gasket	304+graphite	304+graphite	304+graphite	304+graphite	316+graphite	304+graphite	316L+graphite	316+graphite
11B	Ring Gasket	Soft steel	A182 F304	A182 F304	A182 F304	A182 F316	A182 F304L	A182 F316L	20-Alloy
12	Bonnet Bolt	A193 B7	A193 B7	A193 B16	A193 B8	A193 B8	A193 B8	A193 B8	A193 B8
13	Bonnet Nut	A194 2H	A194 7	A194 7	A194 8	A194 8	A194 8	A194 8	A194 8
14	Eyebolt	Carbon steel	Carbon steel	Carbon steel	Carbon steel+Zn				Carbon steel+Zn
*1	PN≥600 CLASS seal face will be HF
*2	PTFE Optional
NA	Integral with vessell