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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. For more information on the products of Markisches Werk Halver, Circle 4 on Reader Service Card For more information on New Sulzer Diesel, Circle 5 on Reader Service Card A WISE BUYER BUYS BAIER HATCHES tested and guaranteed watertight z 0 1 fiC LU < OVER THE YEARS, WE HAVE LEARNED THAT PRODUCING A GOOD PRODUCT AND GIVING CUSTOMER SERVICE IS THE BEST ADVERTISING. • Material: aluminum, bronze, galvanized steel. • SAFETY: never iced in as the t wrench is removable. • TAMPER PROOF: you lock it and it stays locked until you unlock it: • MAINTENANCE: only two moving parts. • APPROVED AND USED: ABS. USCG. US Navy. Corps ol Eng., Canadian Dept. of Transport • SHAPES AND SIZES: flush round 8. 14, 16, 18, 20, 22, 24, ovals flush plain or hinged, 13)4 X 2014, 15 X 24. Coamings available for all sizes. We take this means of thank ing our many customers for their past business and trust we can continue to serve you. For a free engineering catalogue write or phone: I.S. Baler] £ ASSOCIATES 7527 NE 33rd Dr. Portland. Oregon 97211 503 287-8885 Fax (503) 287-8844 Circle 207 on Reader Service Card 810 Industrial Road C aria tad t, NJ 07072 (201) 843-4700 (201) 843-8470 Fax 1700 Eleventh Street Oakland, CA 04807 (SIO) 834-60OO (S10) 834-7803 Paz 33 Rector Street New York, NY 10008 (212) 425-1006 (212) 383-3202 Pax Anthony Del Gavio President DEL GAVIO MARINE HYDRAULICS, INC. SALES • SERVICE • CONSULTING • PARTS • COMPLETE REPAIRS ON ALL TYPES OF ELECTRO-HYDRAULIC STEERING SYSTEMS, HATCH COVERS & DECK MACHINERY • FULL ELECTRICAL SERVICE INCLUDING MOTOR REWINDING • HOSES & FITTINGS "Serving the Marine Industry for over twenty-five years" Circle 218 on Reader Service Card BREATHE EASY Closed Filtered Crankcase Ventilation Systems CRANKVENT™ PRACTICALLY EATS OIL, MIST, ELIMINATING DRIPPING CRANKCASE VENT TUBES AND BUILDUP OF OILY SLUDGE DEPOSITS ON ENGINES & EQUIPMENT. AVAILABLE IN BOTH OPEN AND CLOSED CRANKCASE CONFIGURATIONS FOR ALL DIESEL ENGINES. CRANKVENT™ SAVES YOU TIME, MONEY AND HASSELS FROM ENVIRONMENTAL REGULATIONS. LET CRANKVENT™ HELP YOU AND YOUR DIESEL. BREATH EASY! CALL 800-552-7079 OR FAX 516-728-4204 DIESEL RESEARCH, INC. P.O. BOX 213, HAMPTON BAYS, N.Y. 11946 Circle 220 on Reader Service Card
