Fuel supply system must be precisely controlled by the flow valve

Scramjet engine fuel flow regulator is proportional flow control valve to achieve. Since the flow control valve into the first fuel for cooling the engine , into the engine for combustion , and thus the fuel through the flow control valve temperature up 400 ~ 500 ° C. Fuel feed speed control for fuel combustion and engine performance  High pressure ball valve  are essential, so the fuel supply system must be precisely controlled by the flow valve . High temperature environment has the potential to bring the following temperature flow regulating valve problems: First , the flow control valve does not have a temperature resistance to high temperature ,   Needle valve  and corrosion-resistant properties ; secondly , because of the flow control valve at room temperature under high temperature and large thermal expansion coefficient a small yield stress and thermal Compression fitting , the spool movement of the valve sleeve affected, leading to failure of the flow control valve adjusted . Thus high thermodynamic characteristics of the flow control valve analysis is crucial, particularly the flow control valve moving friction with the surface size of the gap , if the working member between the amount of thermal deformation due to material and structure in the first and the larger , then it may movement can cause friction with the gap grows or shrinks , if the gap increases, the result is bound to make the seal gap increased fuel leakage ;