API 6D/594 Standard Swing Check Valve

Valve Type Swing Check Valve (Full Bore)
Design Standard API 6D (24th Edition)
Pressure Standard ASME B16.34
Face-to-Face ASME B16.10 / API 6D Table 8
End Connection RF Flanges (ASME B16.5) or BW Ends (ASME B16.25)
Fire Safe Design API 607 / API 6FA (Optional)

Description

TECHNICAL DATA SHEET

API 6D SWING CHECK VALVE

Full Port · Replaceable Seat · Stellite 6 Sealing

Design & Standards

Parameter	Specification
Valve Type	Swing Check Valve (Full Bore)
Design Standard	API 6D (24th Edition)
Pressure Standard	ASME B16.34
Face-to-Face	ASME B16.10 / API 6D Table 8
End Connection	RF Flanges (ASME B16.5) or BW Ends (ASME B16.25)
Fire Safe Design	API 607 / API 6FA (Optional)

Materials

Component	Material	Specification
Body & Bonnet	Carbon Steel	ASTM A216 WCB
Disc (Clapper)	Carbon Steel	ASTM A216 WCB
Seat Ring	Replaceable Stainless Steel + Stellite 6	ASTM A182 F304 + AWS A5.21 ERCoCr-A
Hinge Pin	Stainless Steel	ASTM A479 Type 316
Bushings	Self-Lubricating Bronze	ASTM B505 C95400
Bolting	Alloy Steel	ASTM A193 B7 / A194 2H
Gasket	Spiral Wound (SS316 + Flexible Graphite)	ASME B16.20

Hardfacing Detail:

Seat sealing surface: Stellite 6 overlay (min. 2.5 mm thickness, HRC 40-45).
Hardness differential ≥ HRC 5 between seat and disc sealing surfaces.

Pressure & Temperature Ratings

Class	Max. Working Pressure (bar)	Temperature Range	Test Pressure (bar)
Class 300	50.4 @ 38°C	-29°C to +425°C	Shell: 75.6 / Seat: 55.4
Class 600	100.8 @ 38°C	-29°C to +425°C	Shell: 151.2 / Seat: 110.8
Class 900	151.1 @ 38°C	-29°C to +425°C	Shell: 226.7 / Seat: 166.3

Note: Temperature derating per ASME B16.34.

Sealing & Performance

Feature	Specification
Seal Type	Metal-to-Metal (Stellite 6 vs. Stellite 6/Disc)
Leakage Class	API 598 / API 6D: Class IV (Metal Seated)
Cracking Pressure	≤ 0.14 bar (Size-dependent)
Flow Direction	Horizontal or Vertical (Upward flow only)
Backflow Prevention	Zero visible leakage per API 6D §7.3.2

Dimensional Data

Size Range	NPS 2″ to 36″ (DN 50–900)
Port Size	Full Port (100% pipe ID)
Flange Drilling	ASME B16.5 Class 300/600/900 RF
Valve Weight	Per ASME B16.34 / API 6D Annex A

Testing & Certification

Test	Standard	Requirement
Shell Test	API 598 / API 6D	1.5× rated pressure
Seat Test	API 598 / API 6D	1.1× rated pressure
Backseat Test	API 6D	1.1× rated pressure (if applicable)
Fugitive Emission	ISO 15848-1 / TA-Luft	Option: Class B (≤50 ppm)
NACE Compliance	MR0175 / MR0103	Optional (H₂S service)
Fire Test	API 6FA	Optional (30 min fire endurance)

Optional Features

Extended Bonnet: For cryogenic (-196°C) or high-temp (>425°C) service.
Anti-Slam Device: Spring-assisted closing for vertical installations.
Bolt-On Cover: For easy seat replacement without valve removal.
Locking Device: Mechanical disc lock in open position.
Injection Port: For sealant/grease injection (API 6D Annex F).
Position Indicator: Disc open/close visual indicator.

Marking & Documentation

Body Marking: Per API 6D §10.1 (PN, DN, Material, Manufacturer, Heat No.).
Certification: API 6D Monogram, Material Test Reports (MTRs), NDE Reports (RT/UT/PT).
Compliance: PED 2014/68/EU (Option: CE Category IV), CRN (Canadian Registration).

APPLICATION NOTES:

Typical Services: Crude oil, natural gas, refined products, CO₂ injection, produced water.
Excluded Services: Slurries, strong acids/alkalis, particulate-laden fluids.
Installation: Flow arrow must match pipeline direction. Vertical pipes require upward flow.

GUATANTEE:

SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.

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