MWH offers a wide range of high-quality inlet and exhaust valve spindles for the most demanding engine applications running on Natural Gas (LNG / LPG), Marine Diesel Oil, Heavy Fuel, Bio and Future Fuels. For engines running on Gas or with low-Sulphur fuels, MWH has developed proprietary seat coatings to extend component life in the most highly loaded engines. MWH was the first to introduce Nimonic exhaust valves for HFO applications in the 1970’s. In addition, MWH uses stainless steels, Iron-based alloys, Titanium and Titanium Aluminides. Most valve spindles manufactured from these alloys can be welded with Stellite, Triballoy, Colmonoy, proprietary hardfacing alloys and PVD coatings.

Because durability starts from within, MWH material specifications are more demanding than industry norms. These materials, along with 40 to 50 tightly controlled in-house manufacturing steps, ensure that we always deliver superior performance.

As a system supplier, MWH develops seat ring and valve spindle pairings, to achieve more performance with less wear. Careful material selection and tolerancing of interacting components (valve / seat) are crucial for maximizing lifetime.

MWH manufactures seat rings from Nickel-based alloys (e.g. CrNi 60/40) and stainless steels, layered with well-known wear resistant hardfacing alloys (Stellite, Triballoy). When necessary, we coat the inner surface with MW-C³ to protect against cold corrosion.  Seat rings may be produced from rolled bar, forgings or centrifugal castings, depending on material and application. For engines running on Gas or low-sulphur fuels, MWH developed proprietary seat coatings to extend component life in the most highly loaded engines. MWH offers reliable solutions, including cooled and non-cooled seats, hardening techniques, as well as various innovative coatings.

MWH valve guides are engineered and manufactured depending on the corresponding valve spindle – the MWH system approach. The valve clearance is crucial to provide extended service life and the lowest lifecycle costs.

MWH manufactures valve guides consisting of continuous cast iron, dead-mold casting and high thermally conductive lamellar graphite iron. You benefit from low friction when choosing MWH valve guides and conductive components. The valve guide fit and tribological properties play critical roles in the reliability of the cylinder head system. MWH valve guides are proven over decades in the field.

MWH valve rotators have been in service for a wide range of engine types for decades. MWH offers its system design experience to develop tailor-made rotator solutions. All rotators undergo an endurance test on MWH’s own test cells before market launch. MWH offers two versions:

The Ball and Spring Rotator (BSR) rotates inlet and exhaust valve spindles during their opening stroke, making use of the valve spring forces. Valves will be heated and cooled symmetrically, reducing the thermal gradient and stresses.

The Turnomat is the only valve rotator on the market offering forced rotation and controlled seat-polishing, tuned to meet the needs of your engine. Due to the seat-polishing effect, hard carbon deposits on the seat surface are removed. This prevents pitting and blow-by, which can lead to catastrophic valve failure. Reliable rotation provides uniform temperature distribution around the valve head.

MWH manufactures individual valve cages and complete cage units that are ready to mount on your various engine types. Valve cages normally consist of three major parts, connected via vacuum brazing and protected on the exhaust port via thermal metal spraying.

After their useable life has been exceeded, we offer valve cage reconditioning services. This process is carried out with the same quality and attention to detail as new cages. For details, see our Reconditioning section.

MWH supplies clamping cones and valve springs with outstanding dynamic performance for unsurpassed valve longevity. Our springs are dynamically tuned to the valve train to prevent resonance and valve bouncing. We offer single- and dual-coil systems manufactured exclusively from world-class materials.