Standard
Design and manufacture: API 6D
Face to face: ANSI B 16.10
Flange: ANSI B 16.5a
Butt welding end dimension: ANSI B 16.25
Pressure test: API 6D or API 598
Face to face: ANSI B 16.10
Flange: ANSI B 16.5a
Butt welding end dimension: ANSI B 16.25
Pressure test: API 6D or API 598
Purpose
API check valve is applied to petroleum, chemical, water power, thermal power station and other pipelines. It is used to cut off or turn-on the medium, for example water, oil, steam, etc.
Main accessory material
|
Disc surface
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13Cr
|
13Cr
|
STL
|
304
|
STL
|
316
|
STL
|
Monel
|
304
|
304
|
STL
|
|
Seat surface
|
13Cr
|
STL
|
STL
|
304
|
STL
|
316
|
STL
|
Monel
|
304
|
304
|
STL
|
|
Shell
|
ASTM A351 CF3
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ASTM A351 CF8M
|
ASTM A351 CF3M
|
||||||||
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Disc and yoke
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|||||||||||
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Pin axes
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F304L
|
F316
|
F316L
|
||||||||
|
Disc surface
|
304L
|
304L
|
STL
|
316
|
316
|
STL
|
316L
|
316L
|
STL
|
||
|
Seat surface
|
304L
|
STL
|
STL
|
316
|
STL
|
|
STL
|
316L
|
316L
|
STL
|
|