DN50-PN40-RF Axial Check Valve

Nominal Diameter (DN) 50 mm
Nominal Pressure (PN) 40 bar
Connection Type RF (Raised Face Flange)
Design Type Axial, Spring-Assisted
Applicable Media Water, Oil, Steam, Gas, etc.
Media Temperature Range -20°C ~ +200°C
Body Material Carbon Steel WCB / Stainless Steel 304 / 316
Disc Material SS 304/316 + Stellite hard-faced sealing
Seat Seal Metal Hard Seal / Soft Seal (PTFE)
Spring Material SS 316 / Inconel X-750
Flange Standard EN 1092-1 (PN40) / ASME B16.5 (Class 300)
Cracking Pressure ≤ 0.1 bar
Full Flow Pressure Drop ≤ 0.02 bar

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TECHNICAL DATA SHEET

Product: DN50-PN40-RF Axial Check Valve

PRODUCT DESCRIPTION

The axial check valve (also known as axial flow check valve) is designed for minimal flow resistance and pulsation reduction. Featuring an axial flow path and spring-assisted closing mechanism, it is suitable for pipeline systems requiring low water hammer, minimal pressure drop, and tight sealing. Suitable for horizontal or vertical installation (flow direction must be observed).

KEY TECHNICAL PARAMETERS

Item	Spezifikation	Bemerkungen
Nenndurchmesser (DN)	50 mm	2 inch
Nominal Pressure (PN)	40 bar	Approx. Class 300
Connection Type	RF (Raised Face Flange)	Per EN 1092-1 / ASME B16.5
Design Type	Axial, Spring-Assisted	Disc moves parallel to pipeline axis
Applicable Media	Water, Oil, Steam, Gas, etc.	Dependent on seat material
Media Temperature Range	-20°C ~ +200°C	High-temp version available up to +400°C
Gehäusematerial	Carbon Steel WCB / Stainless Steel 304 / 316	Duplex steel etc. optional
Disc Material	SS 304/316 + Stellite hard-faced sealing
Seat Seal	Metal Hard Seal / Soft Seal (PTFE)	Optional
Spring Material	SS 316 / Inconel X-750	Selected per media temperature
Flange Standard	EN 1092-1 (PN40) / ASME B16.5 (Class 300)	Other standards available upon request
Cracking Pressure	≤ 0.1 bar	Low differential pressure required to open
Full Flow Pressure Drop	≤ 0.02 bar	Typical value, depends on flow velocity

DIMENSIONS & CONNECTIONS (Typical)

Dimension	Value (mm)
Face-to-Face Length L	Approx. 200-250
Overall Height H	Approx. 150-180
Flange OD D	165
Bolt Circle Diameter K	125
Bolt Holes (Number × Diameter)	4 × φ18
Flange Thickness t	Approx. 24
Flange Face	RF (Raised Face) Ra≤3.2μm
Weight (WCB)	Approx. 12-15 kg

PERFORMANCE CHARACTERISTICS

Low Flow Resistance: Axial streamlined flow path, lower pressure drop compared to conventional swing or lift check valves.
Rapid Closing: Spring-assisted closure minimizes reverse flow and water hammer.
Reliable Sealing: Metal hard seal for high temperature/pressure; soft seal option for bubble-tight shut-off.
Flexible Installation: Suitable for horizontal or vertical mounting (arrow must point upward or horizontally in flow direction).
Easy Maintenance: Most designs allow in-line maintenance without removing from pipeline.

TYPICAL APPLICATIONS

Petrochemical: Pump discharge, compressor pipelines.
Power Industry: Feedwater systems, condensate lines.
Water Supply: High-pressure pump discharge, network backflow prevention.
Industrial Processes: Steam lines, cooling systems.

TESTING & CERTIFICATION

Test Item	Standard	Requirement
Shell Strength Test	EN 12266 / API 598	1.5 × PN (60 bar)
Seat Leakage Test	EN 12266 / API 598	1.1 × PN (44 bar)
Reverse Flow Seal Test	As per customer request	Gas or liquid test available
Material Certificate	EN 10204 3.1	Optional

INSTALLATION & MAINTENANCE NOTES

Verify valve flow direction arrow matches medium flow direction before installation.
Recommended to install a strainer upstream to prevent seal damage from debris.
For vertical installation, ensure spring is below the disc (refer to specific design drawing).
Periodically check for smooth operation and abnormal vibration/noise.

ORDERING EXAMPLE

DN50-PN40-RF Axial Check Valve, Body WCB, Disc/Seat 304+Stellite, Spring 316, Metal Hard Seal, EN 1092-1 Flange.

Note: The above data represents typical design values. Actual product specifications may vary depending on specific design, material selection, or manufacturing standards. Please confirm detailed specifications with the manufacturer before ordering.

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