Axial Flow Check Valve

An axial flow check valve is the preferred solution for critical non-return applications such as the protection of rotating equipment and systems where low pressure loss, stable operation and dynamic behaviour are essential.
The Axial Flow Non-Slam Nozzle Check Design is a significant step in innovation regarding check valves. The primary differentiation is their sizing and selection, tailoring the individual valve for the application’s process parameters. This philosophy differs significantly from the standard norm of selecting check valves based on their pipe size. Driven by the industry requirement to ensure surge mitigation, axial flow check valve is an unmatched check valve solution.

Axial flow check valve is specifically designed for fast-reversing systems where backflow is a constant concern. It is categorized as a non-slam check valve as the valve closes without slamming meaning no excess pressure spikes are created. Most axial flow check valve is spring-loaded, with a single low-mass disc, which facilitates a fast, dynamic response to reduction in flow. Due to having a single disc and spring when the disc is opening, the force is balanced resulting in an even flow.

Product Parameters

Normal diameter: 2 - 48 Inch (DN50 - DN1200)

Pressure range: Class 150 - 2500 LB

End connection: RF, RTJ

Working temperature: -29℃ ~ +400℃

Material: Carbon Steel, Stainless Steel, Alloy Steel, Aluminum bronze, Ti

Design and Manufacture: API 594

Structural length: API 594

Connection: ASME B16.5, ASME B16.47

Test and Inspection: API 598

The base valve design is available in various body configurations to suit the customers' needs for industry standards, specification, weight and connection requirements. The majority of axial flow check valve will be sold as flanged.

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Products Method of operation

When pressure differential between the upstream and downstream side of the valve exceeds cracking pressure of the spring, the obturator will move and allow flow. The flow area of the valve decreases steadily down to the seat diameter; this is the venturi design.

As a result of the venturi design, the reduced flow area increases the kinetic pressure and reduces the static pressure allowing the valve to fully open quickly. The spring is selected so that the disc is fully opened and stable against its backstop under normal flow conditions.

When a noticeable reduction in flow occurs, the spring reacts early against the force of the reducing flow.

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Typical Applications

Although axial flow check valve can be utilized in a multitude of applications, a growing number of niche sectors the valves have primarily been utilized in the following:

Oil and gas production, including midstream:
◆ Regasification
◆ Liquefaction
◆ Centrifugal compressor discharge
◆ Fire water lines
◆ Oil/steam separation
◆ Steam and CO₂ injection
◆ Oil and gas gathering systems

Chemical and pharma:
● Chlorine
● Phosgene
● Aromatics
● Polymers
● Acids
● Air separation
● Caustics

Petroleum refining and petrochemicals:
● Hydrogen
● Cracking

● Steam
● Crude oil
● Ethylene
● Propylene
● Steam

Power:
● Steam
● Condensate
● Boiler feed pumps
●Cooling towers
●Service water recirculators
●River water intake
●Renewables

The most important thing to remember is that axial flow check valve is specifically designed for fast-reversing systems where backflow is a constant concer

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