Leakage of Metallic Ball Seat Valves with Anisotropic Surfaces

Abstract

Metallic ball seat valves are an essential component of many hydraulic systems. They are used for many different purposes such as pressure relief valves or check valves. Despite their universal usage, their sealing mechanism is not yet fully understood. In previous works, a successful method for the simulation of the fluid leakage of metallic ball seat valves has been developed and confirmed experimentally. The method is based on Persson's contact mechanics theory, which is based on surface roughness power spectrum C(q). This theory takes a wide range of roughness values at different length scales into account. The previous method has been restricted to isotropic surfaces, but most surfaces of practical interest are highly anisotropic. A method for the calculation of pressure flow factors using Persson's method is presented. Based on these, a model for the leakage calculation can be developed. The simulation results are validated using an experiment.

Multi-objective optimization design of low-power-driven, large-flux, and fast-response three-stage valve

“…Under the same clearance and pressure drop, the leakage loss of high-pressure water-based hydraulic valves of the same specifications is tens of times that of oil pressure control valves, requiring a tight matching in their structure [6]. Additionally, internal leakage must be almost zero when the spool is closed, necessitating the avoidance of slide-valve structures [7]. To meet these performance indicators, it is necessary to comprehensively consider the sole physicochemical properties of water-based medium, improve the structure and design parameters of hydraulic valves, or develop entirely new designs.…”