Axial check valve

An axial 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.

Facts

Axial flow

Streamlined flow path through full-port expanded body avoids turbulence and prevents erosion and vibration. Process downtime and maintenance costs are eliminated.

Low pressure loss

The full opening flow passage and high-pressure recovery of the venturi-shaped body result in very low pressure loss: reduced operating cost of pumps and compressors.

Tight shut-off

Tight shut-off is obtained by means of metal-to-metal sealing between the disk and the seat. This sealing is not affected by erosion and deformation of material (like with a soft seal).

Low cracking pressure

The stability of a compressor system during startup benefits from a low cracking pressure. This is achieved with a large disk that has identical effective pressure areas on both sides (line contact sealing).

Easy opening and stable operation

The low static pressure in the venturi-shaped throat area creates a pressure differential over the disc, resulting in easy opening. The axial check valve responds smoothly to changes in flow and remains stable when it is supposed to be.

Non-slam operation

The spring-assisted design ensures ultra-fast closing with virtually no backflow and pressure surges in critical applications such as multi-pump systems or LNG trains.

Maintenance free

Internal construction is based on the application of sound basic mechanical engineering principles. Consequently, the axial check valve does not require any maintenance.

Reliable performance prediction

Both the pressure drop and the dynamic behaviour can be predicted with great accuracy, based on full-scale laboratory flow tests and a mathematical model developed in cooperation with a recognized fluid hydraulic laboratory.

Product Summary

Type designation
Check or non-return valve
Model
TKZ - Y
Scope
Sizes 2" - 84", Rating class ASME 150 - 2500 or API 3000 - 10000, Higher pressure ratings on request
In preference to
Swing check valve (including controlled closure devices)
Dual-plate check valve
Piston check valve
Typical applications
Transmission pipeline compressor discharge
LNG compressor train
Cooling water system (Ethylene, LNG)
Multiphase pumping
Subsea pump and flowline application
Streamlined flow path through full-port expanded body
Streamlined flow path through full-port expanded body
Axial check valve, Russia
Axial check valve, Russia
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Axial check valve, 72"
Axial check valve, 72"
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Dimensionless dynamic characteristic

Mokveld and Delft Hydraulics Laboratory together developed the ‘dimensionless dynamic characteristic’ in 1986, as the mathematical model of the behaviour of non-return valves. With this Mokveld contributed to the theoretical foundation for the understanding and application of non-slam check valves. Today this theory still stands, with the ‘dimensionless dynamic characteristic’ being used in transient simulation software packages, for the hydraulic design and optimisation of pipeline systems.

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If you would like to have more information about this product, please contact us. As experts in engineered valve systems, we offer reliable customer services and can support you with valve sizing and selection, process engineering and system lay-out and budget pricing.

Special features

 
  • Custom-designed valve to meet the clients specific process conditions.
  • Fire-safe, cryogenic (LNG) and subsea design.

 

Excellent LNG check valve

LNG train operators put the highest priority on production availability for a steady supply of LNG to meet the long term supply contracts (and prevent the high fines in case deliveries are delayed). To obtain this production availability the most reliable equipment for critical components is preferred. Non slam check valves are critical for the LNG process and Mokveld’s Non Slam Axial flow check valves are applied in most world class LNG trains.

In the LNG process the compressor train and cooling systems account for the biggest energy consumption. Therefore it is essential to minimize the pressure loss in the compressor trains and cooling water processes. The check valve selection and sizing is essential.

Mokveld Axial flow check valves are characterized by their large flow area and high pressure recovery design. Therefore Mokveld check valves offer the lowest pressure loss on the market. Mokveld provides an application specific valve sizing with pressure drop calculation for every valve, guaranteeing the lowest pressure loss and stable operation.

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Product support

In order to ensure you continue to benefit from valves that offer high capacity and safety as standard, our Product Support team offers a range of services to improve your valves in use and to achieve cost savings.


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