Study on motion characteristics of check valve in reciprocating liquid hydrogen pumps

Abstract In this paper, based on the fluid continuity equation and the mechanical equilibrium equation, a mathematical model of valve motion is established, where the density change due to compressibility of liquid hydrogen is considered in the continuity equation and the cylinder pressure is incorporated into the differential equations as a variable. The impacts of spring stiffness and frequency on valve motion are investigated. The results demonstrate that the spring stiffness mainly affects the valve after opening. In contrast, the frequency directly affects the initial speed of the valve and then has a greater impact on the valve movement. This work would contribute to understanding the valve motion mechanism of reciprocating liquid hydrogen pumps.