Boilercheck valvelocation

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

Watts 2000Flow Check Valveadjustment

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.

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.

Hydroniccheck valve

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.

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.

Watts 2000flow Check Valve

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

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.

Boilerflow 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.

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

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

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

How does aflow check valvework

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.

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.

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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.

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 hydraulics laboratory.