Analysis of Flow Forces Acting on a Spool Valve. 3rd Report. Influence of Valve Dimensions on Lateral Flow Force.

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  • スプール弁に作用する流体力の解析　第３報　　弁の諸元が横力に及ぼす影響
  • スプールベン ニ サヨウ スル リュウタイリョク ノ カイセキ ダイ3ポウ ベン ノ ショゲン ガ ヨコリョク ニ オヨボス エイキョウ

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The purpose of this paper is to clarify the valve dimensions required to reduce the lateral flow force on the spool caused by inner flow. The flow path of the examined spool valve with the outlet port near the valve orifice is non-axisymmetric. Numerical simulations of three-dimensional flow, flow visualization and pressure measurement were performed to investigate the magnitude of the lateral force and the relation between the force and flow pattern. The lateral force is mainly caused by a flow pattern in which the jet at the opposite side of the outlet port turns along the spool toward the port. The lateral force depends on the magnitude of the circumferential velocity component as well as the jet impinging pattern and the flow pattern near the outlet port edge. It was found that increasing the axial spool length and the bucket depth effectively reduced the lateral flow force.

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