Jansen's Aircraft Systems Controls | JASC Jansen's Aircraft Systems Controls Inc. (JASC) designs, manufactures valves, and other specialized industrial products that control the flow of liquids, gases, fibrous and slurry materials. These products are suitable for use in aerospace, military, aviation, chemical, food and beverage, marine, petroleum production and refining, water, oil and gas, mining and gas turbine industries. JASC awarded contract with Boeing for High-Pressure "Smart" Regulators The JASC Water Cooled Liquid Fuel Check Valve has proven to significantly reduce fuel coki