Exhaust Valve

how does an exhaust valve on a sulzer wallen engine work?

how does an exhaust valve on a sulzer wallen engine work? I can not find a good explanation of how it works so i'm wondering if anyone knows?

I am not sure what you mean by Wallen, but I can give you some information about current Sulzer practice.
As your question refers specifically to an exhaust valve, I have assumed that you are referring to a two-stroke engine. Modern Sulzer practice is to use the uniflow scavenging principle for their two-strokes as they can be developed to produce more power than the loop-scavenged type.
Uniflow engines are scavenged at the end of each working stroke by ports in the cylinder wall admitting scavenging air at above atmospheric pressure. Simultaneously a valve in the cylinder cover opens or an upper piston connected to the crankshaft, either by crankthrows or eccentrics, uncovers exhaust ports to enable the spent gasses to be expelled.
Sulzer practice is to use an exhaust valve. The valves are opened by hydraulic pressure from pumps driven by the camshaft which is mounted at mid-engine height. Compressed air is employed to close the exhaust valves. The Sulzer-Wartsila engines currently in production use this system.

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