API 594 Dual Plate Check Valves
Class |
150 |
300 |
600 |
Item |
Applicable Specification |
Wall Thickness |
API 594 |
Pressure - Temperature Ratings |
ASME B16.34 |
General Valve Design |
API 594 & B16.34 |
End to End Dimensions |
API 594 |
Flange Design |
ASME B16.5 |
Materials |
ASTM |
PART |
COMMON MATERIAL COMBINATIONS |
||||
Body |
A216 WCB |
A216 WCB |
A216 WCB |
A351 CF8M |
A351 CF8M |
Body Seat |
Stellite Facing |
Stellite Facing |
Integral |
Integral |
Stellite Facing |
Disc |
A216 WCB+ 13% CR FACED |
A351 CF8M |
A351 CF8M |
A351 CF8M |
A351 CF8M |
Hinge Pin |
410 SST |
316 SST |
316 SST |
316 SST |
316 SST |
Stop Pin |
410 SST |
316 SST |
316 SST |
316 SST |
316 SST |
Pin Holder |
Carbon Steel |
316 SST |
316 SST |
316 SST |
316 SST |
Key |
410 SST |
316 SST |
316 SST |
316 SST |
316 SST |
Washer |
410 SST |
316 SST |
316 SST |
316 SST |
316 SST |
Set Screw* |
Carbon Steel |
316 SST |
316 SST |
316 SST |
316 SST |
Lock Nut** |
Carbon Steel |
316 SST |
316 SST |
316 SST |
316 SST |
Spring |
Inconel X-750 |
Inconel X-750 |
Inconel X-750 |
Inconel X-750 |
Inconel X-750 |
Eyebolt |
Carbon Steel |
Carbon Steel |
Carbon Steel |
Carbon Steel (Zn plate) |
Carbon Steel (Zn plate) |
(NOTE) Other materials and trims available.
*Sizes 2"-6" only
**Sizes 8" and above only
DESIGN FEATURES:
• Retainerless body Design with no external body penetrations eliminating the possibility of outside leakage. Disc assembly secured in place by high strength key.
• End Gasket Surfaces are uninterrupted with no screws or lock pins breaking the gasket surface. No gasket restrictions required.
• Seat faces lapped for smooth finish and superior sealing
• High torsion Inconel springs for quick closing
• Each valve is shell and seat pressure tested per industry standard API 598
• Available in Wafer, Lug and Double Flange styles
• Each valve has a unique certification number that is traceable to the valve certification sheet which includes MTR data, pressure test report and inspection report
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