Page 80: of Maritime Reporter Magazine (November 1993)

Sulzer Adopts MWH Turnomat Valve After Tests

Show Improved Performance

Equalizing effect of a rotating exhaust valve on the valve seat temperature for 720 kW/cyl at 510 rpm 165 bar Pmax (To = Tmax - Tmin with non-rotating valve; T = Tmax - Tmin with rotating valve). (Source: New Sulzer Diesel, Winterthur.) From the even and relatively fast rotation of the valve spindle, the temperature of the valve is equalized, reducing peak temperatures on some areas of the valve seat, reducing thermal stress and improving corrosion resistance. (m/s)

Load

Exhaust valve rotational speed on closing (related to mean seat diamater of 120mm) for two valve rotating systems for 720 kW/ cyl at 510 rpm, 165 bar Pmax. (Source: New Sulzer Diesel,

Winterthur.) The rotation of the valve at the end of the closing stroke induces a polishing effect and rubs combustion residues from the seat, achieving a better heat exchange to the cold seat insert.

Following a successful test which reportedly demonstrated that the use of turnomat valves on

Sulzer engines increases cost effectiveness and lifetime of the valve spindle as well as time between overhauls — effectively optimizing the reliability and availability of the engine — the valve rotator turnomat has been adopted as a standard component on the exhaust valves of the

Sulzer ZA40S engine.

Markisches Werk Halver (MWH), which has extensive service experience with valve rotator turnomats on medium speed diesel or gas en- gines, found that turnomats, which rotate from eight to 15 rpm depending on engine type, signifi- cantly increased valve lifetime. At idle speed, the design of the turnomat also reportedly ensures a safe rotation.

In order to test the performance of the turnomat, one Sulzer 8 ZA40S engine was fitted with turnomats.

The first inspection was carried out by New

Sulzer Diesel Winterthur (NSD) and MWH ser- vice engineers in mid-1992 aboard the M/S Olau

Hollandia, after 3,400 hours of operation. The turnomats and the valve seat surfaces were found to be in excellent condition, and the rotation polishing effect was clearly noticeable.

In March 1993 a second inspection after 6,000 hours was performed by the New Sulzer Diesel

Wintherthur service engineers. The results of the first inspection were reportedly confirmed, the target improvement of engine reliability through the use of the rotator turnomat report- edly reached.

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