Introduction: Karl Krieger, a prominent inventor based in Wuppertal, Germany, has made significant contributions to the field of hydraulic technology. With a total of 15 patents to his name, Krieger’s work primarily focuses on pressure control mechanisms used in mine roof supports, showcasing his expertise and innovation in engineering.

Latest Patents: Among Karl Krieger's latest patents are two notable inventions that enhance the functionality and safety of hydraulic systems. The first patent is for a **Pressure-Control Valve**, designed to regulate the pressure within a working cylinder of a hydraulic walking mine roof support. This valve operates as a pressure-limiting device, dynamically adjusting according to predetermined pressure levels in a connected control conduit. The valve utilizes a spring-loaded control piston that influences the closure member, effectively maintaining the desired pressure in the working cylinder during operation.

The second patent is for a **Prop Control Valve**. This device is essential for resetting props at a specified minimum setting pressure. The control valve connects various conduits, including high-pressure and return-flow lines, to ensure precise adjustments. Its innovative design incorporates a spring-loaded closure body that operates based on pressure levels, delivering enhanced control and reliability in mine operations.

Career Highlights: Throughout his career, Karl Krieger has contributed significantly to the development of hydraulic technologies while working for notable companies such as Hermann Hemscheidt Maschinenfabrik GmbH & Co. and Hermann Hemscheidt Maschinenfabrik GmbH. His dedication to advancing hydraulic systems has earned him a reputation as a pioneer in the industry.

Collaborations: Krieger has collaborated with esteemed colleagues throughout his career, including Werner Reinelt and Willi Kuster. Their combined expertise and innovative approaches have led to various successful projects and patents, further advancing the field of hydraulic technology.

Conclusion: Karl Krieger's impressive portfolio of patents and collaborations signifies his invaluable contributions to hydraulic engineering. His dedication to innovation not only enhances the efficiency and safety of mining operations but also sets a benchmark for future inventors in the industry. As he continues to push the boundaries of hydraulic technology, Karl Krieger remains a true asset to the engineering community.

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