Applications of our Decompression Valves
The decompression valves developed by Karcoma are primarily used in single-cylinder internal combustion engines, typically in handheld power tools such as chainsaws.
How it works
Starting such an engine often presents difficulties because the compression in the combustion chamber generates fluctuating, sometimes very high reaction forces that act on the operator’s hand. By relieving the internal pressure in the combustion chamber during the compression phase, the Karcoma decompression valve facilitates the starting process.
To start the internal combustion engine, the decompression valve is manually brought into its open position, allowing the internal pressure in the combustion chamber to be vented to the outside through bleed holes during the starting phase. The force required by the operator to start the engine is significantly reduced, resulting in a substantial gain in comfort and safety by minimizing the risk of uncontrolled movements. After the engine’s first ignition, the internal pressure in the combustion chamber rises rapidly, and the valve closes automatically. This seals the vent channel, and the internal combustion engine operates without compression or power loss.
Fine-Tuning
To achieve optimal starting behavior for power tools, precise coordination of closing force and ventilation with the respective engine characteristics is required. This makes it clear that there is no “one-size-fits-all” decompression valve. At Karcoma, you have the option to choose the right variant for your engine from a large number of existing options. And if the optimal design does not yet exist, we will simply develop a new one – individually for your application and, if desired, with your very own button design.
How it works
