Cavitation is a common harmful phenomenon in hydraulic transmission systems, frequently occurs near the orifice of the valves.

The normal-closed electromagnetic valve has reasonable structure design and good close property ofthe valve port to prevent leakage completely.

它结构设计合理，阀口关闭性良好，确保无任何泄漏。

Corresponding dynamic characteristics simulation results of circuit speed were obtained while the step opening of throttle was given.

使用该模型进行了计算机仿真，当给出阀口阶越开度时，得到对应的回路速度的动特性仿真结果。

Calculation and Analysis of Static Pressure Characteristics at the Arbitrary-curve-trimmed Rectangular Valve Port of Automotive Power Steering Gear

汽车动力转向器任意曲线切边矩形阀口压力静特性的计算分析

Flow field indicates conductive value C and the critical pressure ratio b are improved by changing openings.

通过对流场结构的分析表明，改变阀口开度，可以提高阀的音速流导和临界压力比的值；

The influences of inlet velocity and oil droplet diameter on flow and separation were studied as well.

分析了进口流速、出口压力、阀口开度和阀芯锥角对纯水液压锥阀阀口气穴强度的影响。

The calculating method for the static pressure characteristics of the arbitrary-curve-trimmed rectangular valve port is introduced.

对任意曲线切边矩形阀口压力静特性的计算方法做了阐述。

This study has some value for the valve design with complicated orifices and valve noise study.

本文对于液压复杂阀口研究及设计计算以及阀噪声机理研究具有一定的参考价值。

A sectional flow formula is given to avoid the infinite derivative of conventional orifice flow formula.

引入了分段的阀口流量计算公式，解决了传统紊流流量方程存在奇点的问题；

A quantitative packer with negative pressure valve port relates to a powder packer technique.

负压式阀口定量包装机涉及一种粉料的包装机技术。

Research on Structural Design of Valve Port Dynamic Pressure of Direct Acting Relief Valve

阀口动压反馈直动式溢流阀的结构设计研究

Experimental study on noise characteristics of groove-tpye orifices

节流槽型阀口噪声特性试验研究

The designing of water hydraulic throttle orifices and cavitation testing model was introduced.

介绍了纯水节流阀口和气蚀试验模型的设计，实验对比研究了异型纯水节流阀口和常用的锥形节流阀口的抗气蚀性能。

The Analysis and Research of Valve Port Dynamic Pressure Feed-back Low-pressure Spillway Valve

阀口动压反馈低压溢流阀的研究

A Modified Orifice Flow Model for Hydraulic Circuit Simulation

液压回路计算机仿真中阀口流量模型的改进

The Safety valves pilot valve plunger driven in front of mouth;

其导阀口前面有导向柱塞；

Areas calculation and characteristics analysis on combined shape orifice in hydraulic valves

液压组合阀口过流面积计算及特性分析

Numerical Simulation and Visualization Study of Cavitating Flow in Hydraulic Ball Valve

球阀阀口气穴流场的模拟与可视化研究

Study and Application of the Bernoulli Effect Near a Valve Orifice

阀口高速流区伯努利效应分析及其应用

Firstly, MATLAB software is used to do a function resolution on flow area of the anomalous orifice spool valve, and numerical simulation on velocity and pressure distribution in the valve cartridge under different inlet flows and opening are done and the results are analyzed.

首先，对异形阀口滑阀的过流面积进行MATLAB数值解析，对不同流量、阀口开度下阀内的速度场和压力分布等做了数值模拟，并对数值计算或仿真结果做了分析。

Secondly, Steady flow force under different inlet flows and opening conditions are calculated and analyzed, which is based on momentum theory and CFD numerical integration methods.

其次，分别基于动量定理和CFD数值积分两种方法对不同流量和阀口开度下稳态液动力进行计算分析。