2″-2500LB Inconel 625 Lift Check Valve

Nominal Size 2″ (DN50)
Pressure Rating Class 2500 (PN 420)
Valve Type Lift Check Valve – Automatic Non Return
Body Construction Pressure Seal Bonnet (recommended for Class 2500)
End Connections Flanged – ASME B16.5 Class 2500, Ring Type Joint (RTJ) facing standard
Temperature Range –196°C ~ +650°C (depending on trim)
Suitable Media Sour gas, seawater, high pressure steam, superheated water, corrosive chemicals, acidic environments
Flow Direction Horizontal (preferred) or vertical with upward flow

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TECHNICAL DATA SHEET

Product: Lift Check Valve
Größe: 2 inch (DN50)
Druckklasse: Class 2500
Gehäusematerial: Inconel 625 (UNS N06625)
End Connections: Flanged – ASME B16.5 Class 2500
Design: Lift Check (Piston Type)

Basic Specifications

Parameter	Value
Nenngröße	2″ (DN50)
Druckbewertung	Class 2500 (PN 420)
Ventiltyp	Lift Check Valve – Automatic Non‑Return
Karosseriebau	Pressure Seal Bonnet (recommended for Class 2500)
End Connections	Flanged – ASME B16.5 Class 2500, Ring Type Joint (RTJ) facing standard
Temperaturbereich	–196°C ~ +650°C (depending on trim)
Suitable Media	Sour gas, seawater, high‑pressure steam, superheated water, corrosive chemicals, acidic environments
Flow Direction	Horizontal (preferred) or vertical with upward flow

Main Features

Lift Check Design: Disc lifts vertically off the seat under forward flow and drops back when flow reverses, providing reliable backflow prevention.
Inconel 625 Construction: Full Inconel 625 body and trim offer exceptional resistance to pitting, crevice corrosion, stress corrosion cracking, and high‑temperature oxidation. Ideal for sour service (NACE MR0175), seawater, and aggressive chemical environments.
High‑Pressure Capability: Class 2500 rating with flanged ends suitable for ultra‑high‑pressure systems.
Pressure Seal Bonnet: Ensures leak‑tight performance under fluctuating high temperatures and pressures.
Renewable Seat & Disc: Seat and disc hardfaced with Stellite 21 for extended service life and ease of maintenance.
Compact Design: Lift check valves offer a shorter face‑to‑face length compared to swing check valves.

Material List (Specified Configuration)

Item	Part	Material
1	Körper	Inconel 625 (UNS N06625)
2	Bonnet	Inconel 625 (UNS N06625)
3	Disc (Piston)	Inconel 625 + Stellite 21 Hardfacing (seat contact surface)
4	Seat Ring	Inconel 625 + Stellite 21 Hardfacing
5	Stem / Guide	Inconel 625
6	Spring (if applicable)	Inconel 718 / Inconel X‑750
7	Bonnet Gasket	Spiral Wound, Inconel 625 + Graphite
8	Bolting	ASTM A453 Grade 660 (or Inconel 718)

Note: Full Inconel 625 construction avoids galvanic corrosion issues common with dissimilar materials.

Dimensions & Structural Data (Flanged Ends)

Parameter	Value
Face‑to‑Face Length (L)	~305 – 340 mm (per ASME B16.10 for Class 2500 lift check)
Flange Standard	ASME B16.5 Class 2500
Flange Facing	Ring Type Joint (RTJ) – standard for Class 2500
Flange Outside Diameter	~235 mm (approx.)
Bolt Circle Diameter	~190 mm (approx.)
Number of Bolts	8 (studs)
Approx. Weight	~95 – 125 kg (flanged version)
Bonnet Type	Pressure Seal

Note: Final dimensions to be confirmed by manufacturing drawings.

Design & Testing Standards

Item	Standard
Design & Manufacture	ASME B16.34, API 6D (where applicable)
Flanged End Connections	ASME B16.5 Class 2500
Pressure‑Temperature Rating	ASME B16.34
NACE Compliance	NACE MR0175 / ISO 15156 (for sour service)
Pressure Testing	API 598 or ISO 5208
Low‑Pressure Air Test	0.6 MPa (6 bar) – no visible leakage
High‑Pressure Hydrostatic Test	1.5 × rated pressure (body), 1.1 × rated pressure (seat)

Inconel 625 Material Advantages

Property	Benefit
Corrosion Resistance	Excellent resistance to seawater, chlorides, sour gas (H₂S), and mineral acids
High‑Temperature Strength	Maintains mechanical properties up to 650°C
Oxidation Resistance	Resists scaling and oxidation in high‑temperature environments
Fatigue Resistance	Superior resistance to thermal fatigue and cyclic loading

Operating Guidelines

Orientation: Lift check valves are typically installed in horizontal pipelines with the bonnet vertical, or in vertical lines with flow upward.
Cracking Pressure: Standard cracking pressure is typically 0.5 – 1.0 psi (0.03 – 0.07 bar). Spring‑assisted designs are available for vertical installation or low‑pressure applications.
Flow Characteristics: Minimal pressure drop when fully open, as the disc lifts completely out of the flow path.

Typical Applications

Subsea & Offshore: High‑pressure subsea manifolds, Christmas trees, and topside piping in seawater service.
Sour Service: Oil & gas production with high H₂S and CO₂ content (NACE MR0175 compliance).
Nuclear Power: High‑temperature steam and feedwater systems.
Chemical Processing: Corrosive chemical plants handling acids, chlorides, and high‑temperature fluids.
Hydrogen Service: High‑pressure hydrogen systems requiring nickel alloy construction to prevent hydrogen embrittlement.

Ordering Information

When ordering, please specify:

Size & Pressure Class: 2″ – Class 2500
Body Material: Inconel 625
End Connections: Flanged (RTJ) – ASME B16.5 Class 2500
Bonnet Type: Pressure Seal
Optional Features: Spring‑assisted disc (for vertical or low‑pressure applications)

This data sheet reflects the flanged connection configuration. For butt weld ends or additional customizations, please contact us with your specific requirements.

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