21427 水圧リリーフ弁内の圧力降下特性と弁の変形が弁の性能に及ぼす影響(複雑流の計測,OS.4 流れの計測と制御)

抄録

This paper deals with influence of valve deformation of water hydraulic relief valve on the valve performance. To suppress cavitation, two serial throttles are employed. Intermediate pressure at the space between the two throttles is determined by the ratio of openings of each throttle. In operation, valve deformation changes valve opening; thus the intermediate pressure changes. The influence of the valve deformation is large when the valve displacement is small and the pressure difference across the throttle is large. The valve deformation under various pressures is calculated using ANSYS 9.0. The results of the numerical analysis is used to estimate value characteristics.