Check Valve API 594

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Check Valve API 594

API 594

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API 594 Check Valve

Swing Check Valve API 594

API Std 594, Check Valves: Flanged, Lug, Wafer, and Butt-welding, is a standard developed and published by the American Petroleum Institute (API) that covers the design, materials, face-to-face dimensions, pressure-temperature ratings, and examination.

Swing check valves are designed to close quickly and automatically with positive shut off in either horizontal or vertical (flow up) pipe runs. Inherently, swing check valves have a low pressure drop and are best suitable for velocity applications.

Check Valve Pressure Rating
  • Check Valve API 594 Class 150
  • Check Valve API 594 Class 300
  • Check Valve API 594 Class 600
  • Check Valve API 594 Class 900
  • Check Valve API 594 Class 1500
Check Valve API 594 Features
  • API 6A and 6D pressure classes.
  • ASME Pressure Class 125 through 2500.
  • Integral and overlaid metal seats also available.
  • Wafer, lug, double flanged and extended body styles.
  • DIN, JIS, BS, AS, and ISO standards are also available.
  • Configurations available in retainered and retainerless style.
  • End Connections: Raised Face, Plain Face, Ring Joint, Weld-End, Hub-End.
General DesignAPI 594 Type B
Wall ThicknessAPI 594 Type B
Pressure-temperatureASME B16.34
Face to FaceASME B16.10
Flange DesignASME B16.5
Butt Welding EndsASME B16.25
Lightweight and Compact Wafer
Dual Plate, Flat Seat Design
Independent Spring Action
Body Strength and Rigidity
Vertical Hinged Design
Simple External Body Geometry
Wide Variety of Materials
BodyA216 WCC
Seat410 + HF
ArmA216 WCC
DiscA216 WCC + 316
Shaft316 SS
End CapA105