Axial Flow Check Valve

Axial Flow Check Valve is a non-slam, spring-assisted check valve. Axial check valves are designed to prevent problems like water hammer and reverse flow in your piping system.

Relia is an experienced Axial Flow Check Valve manufacturer in China. We manufacture non-slam axial flow check valves with soft-seat and metal-seat. The axial flow check valves can be pushed open at low pressure.


  • No-slam closing
  • Low pressure to push it open
  • Metal seat or soft seat

Axial flow check valves are an important protection for pumps and compressors as they induce flow in one direction and prevent backward flow in the opposite direction. Backward flow can do a lot of damage to equipment, so you need axial flow check valves to protect your investment.

The Advantages of Axial Flow Check Valves

Axial flow check valves offer several advantages over other types of check valves, such as: - Rapid closing action (prevents water hammering)

  • The ability to be properly sized for each application
  • Durability
  • Increased valve longevity
  • The ability to accommodate low-pressure drops and high-flow
  • Non-slamming opening and closing
  • Tight shut-off leading to zero leakage
  • Various end-to-end options
  • The ability to be installed in both horizontal and vertical orientations
  • Axial flow check valves offer many advantages over other types of check valves. Relia axial flow check valves can save time and money by preventing damage and increasing the lifetime of your pumps, valves, pipes, and other system parts.


Axial Flow Check Valve Drawing

non-slam axial flow check valve drawing

Part and Typical Material

No. Part Name Typical Material
1 Body ASTM A216 WCB
2 Lock Ring ASTM A105+ENP
3 Seat ASTM A105+ENP
4 O-Ring Viton
5 Seat Insert PEEK
6 Disc ASTM A182 F316+STL .6
7 Spring Inconel X-750
8 Bushing Al-Bronze
9 Diffuser ASTM A216 WCB
10 Lock Ring ASTM A105+ENP


Main Parts

Valve Body

The body is cast or forged in carbon or stainless steel and is available in many other CRA. For severe services and large valve sizes, it can be internally lined or fully cladded instead of having solid CRA. The internal profile minimizes pressure losses, and basic dimensions (face-to-face and wall thickness) comply with API 6D and ASME B16.34 standards. Body connections can be provided per ASME B 16.5 RF or RTJ, and BW end or hub connections are available.

Valve Disc

The disc is the main part of the trim and allows fluid control. It comes in forged steel and cast steel. Its shape is carefully designed to avoid turbulence and is assisted by a spring in its closed position.


The seat ring is part of the trim. It can be integrated with the body or renewable. A ground-lapped surface allows the tightness. 


The valve will be closed quickly at fluid stop and reversal, giving its peculiar non-slam effect and avoiding any reverse fluid acceleration and consequent water hammer. Selection of spring characteristics can be made upon engineering evaluation of specific applications. 


The diffuser supports the disc and spring assembly and lets the fluid exit from the valve with a minor impact on pressure drop.



Water Hammer

A water hammer is a phenomenon that occurs when a liquid comes to a sudden stop and generates shock waves inside the pipe. The resulting high pressure can cause significant damage to pipelines, gaskets, gauges, pipe hangars, and other components. Relia axial flow check valves can reduce the effects of water hammer.

Pressure Pulsations

Pressure pulsations are caused by the intermittent reduction in pressure due to the reciprocating motion of a reciprocating compressor. The pressure fluctuation causes pulsating shock waves in the system, which increases wear on system components. However, axial check valves consist of no swinging parts and, therefore, reduce wear on system components, contributing to a longer lifetime compared to other valve types. The purpose of the Relia axial flow check valves is to let air and gas out of a reciprocating compressor.

Installation Options: Horizontal or Vertical 

A common problem when using a pump is limited space for valves and pipes. Pumps are extremely loud when in operation. Therefore, they are usually put in special rooms. This leaves less room for valves and piping. Axial flow valves can handle turbulence better than conventional check valves. This makes them an excellent option when space is limited. Also, axial flow check valves can be installed on vertical and horizontal pipes.

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