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DEVELOPMENT OF A DIRECT DRIVE SERVO VALVE WITH FLOW FORCE COMPENSATED SPOOL

机译：带流量补偿阀的直接驱动伺服阀的研制

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摘要

This paper is on the development of a Direct Drive servo Valve (DDV) with flow force compensated spool. In valves with spool, flow force is caused by the unbalance of pressure exerted on each land of spool when high-speed flow passes through very narrow orifices. A simple method for flow force compensation using a stepped spool is presented in this paper. It is easy to manufacture the stepped spool of the presented method because the shape of it is simple. The method has another merit that the size of valve need not be increased. Actuating force required for driving the spool can be decreased through the compensation of flow force. The effectiveness of the proposed method is predicted through CFD analysis. The results of the CFD analysis are also utilized for the optimization of step shape. Prototypes of flow force compensated DDV are manufactured and the measurements of flow force are carried out. The measured effectiveness of flow force compensation is very similar to that from the CFD analysis. Performance test results of prototype DDV satisfy required specifications.
机译：本文是关于带流量补偿阀芯的直接驱动伺服阀（DDV）的开发。在带滑阀的阀中，当高速流通过非常狭窄的孔口时，由于施加在滑阀各阀岛上的压力不平衡而产生流动力。本文提出了一种使用阶梯阀芯进行流力补偿的简单方法。因为其形状简单，所以容易制造所提出的方法的阶梯阀芯。该方法的另一个优点是不需要增加阀的尺寸。可以通过补偿流力来减小驱动阀芯所需的致动力。通过CFD分析预测了该方法的有效性。 CFD分析的结果也用于优化台阶形状。制造了流力补偿DDV的原型，并进行了流力的测量。测得的力补偿效果与CFD分析非常相似。 DDV原型的性能测试结果满足要求的规格。

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