So the working efficiency is low . ( 3 ) from the structure of the logic valve , as the poppet valve is sealed by a line touching , the service life should be tested ( 3 )从逻辑阀的结构来看，由于逻辑阀芯是靠线接触来实现密封的，长期在快速冲压的条件下，其使用寿命尚待考验。
Here are three parts in this thesis : building steady state model and transient model for water hydraulic valves . research on the property of flow field inside water hydraulic valves . analysis of the force on water hydraulic valves 论文主要包含三部分的内容：水压阀稳态模型和瞬态模型的建立；水压阀内流场过流特性的研究；作用于水压阀阀芯及阀体上的力特性分析。
Abstract : in this paper , we give an algorithm for fitting curve of valve core . the curve based on a series of relative opening degree provides a series of relative dicharge and different ideal characters of discharge of the valve core . the algorithm can be applied to cad / cam 文摘:提出一种计算机拟合阀芯曲线的算法，以一系列相对开度得到一系列相对流量，从而产生不同的理想流量特性，该算法可用于阀芯的cad和cam
Q41f - 10c catena pad fluorine valve , q41f - 10cf catena pad fluorine valve , j41f - 16 pad fluorine end - valve , j44f - 16 angle form pad fluorine end - valve , sj41f - 10c pad fluorine inspect - lens , the connect form is flange , the passing parts of valve - body lumen and valve - cover valve - core etc . are all metal pad fluorine plastic inside , rotproof excellently Q41f - 10c系列衬氟球阀， q41f - 10cf系列衬氟放料阀， j41f - 16系列衬氟截止阀， j44f - 16系列衬氟角式截止阀， sj41f - 10c衬氟视镜，连接形式为法兰式，阀体内腔及阀盖阀芯等过流部件均为金属内衬氟塑料，耐腐蚀性能优异。
At the same time , the pressure of dynamic state in different opening and closing velocities can be gained , on the basis of results the axial hydraulic force and the fluid force can be calculated , which offers reference and guide foundations for accurately calculating the drive force on water hydraulic valves 同时cfd解析也可以得到不同启闭速度下阀腔内的动态压力，在此基础上计算出作用于水压阀阀芯的稳态和瞬态轴向液动力，对精确计算阀芯驱动力具有重要的参考价值和指导意义。
Located in town of water heating equipment of china , jinye water heating plant is one the enterprises of water heating equipment engaged in science , industry and trade . we own strong technical strength , precision processing equipment and accurate testing measures to produce and sell water heating equipments such as water faucets with high - grade ceramics abrasionproof valve core , pipes , valves , elevating flower shower , hardware wall decoration etc . our plant processes assembly for several domestic manufacturers of water heaters 位于中国水暖之乡的金叶水暖厂是一家科、工、贸结合的水暖器材企业之一，拥有雄厚的技术力量，精良的加工设备与高精度的测试手段，生产销售各种高档陶瓷耐磨阀芯水龙头、管、阀、升降花洒、五金挂件等水暖器材，与数家国内知名热水器厂加工配套。
B ) the design of the new valve : for the displacement of the actuator , hydraulic magnify is used , and the stracture that has comparatively motion beteen harness and body and comparatively stillness between harness and body is adopted . the static characteristic of the new valve and also its dynamic characteristic , the factors that affect the valve ' s characteristic are analyzed 设计新型高速开关阀：对驱动器位移采用了液压式放大，并采用阀套与阀体之间有相对运动，阀芯相对阀体不动的结构。分析了新型高速开关阀静动态特性以及影响其性能的主要因素。
Use zero water pressure opening of valve core without any medium pressure , suitable for the sewage - draining control system of pipelines , water tank etc . containers and the automatic water falling of a drinker . this valve can be fitted with another more than 60 kinds of valve casings , resulting in a flexible installation 采用零水压开启阀芯，开启无须介质的压力，适用于管道水箱等其他容器的排污控制系统饮水机的自动下水等，该阀另有六十余种阀体与之匹配，安装灵活。
Then pid flow rate control algorithm is introduced . all experiments made in this chapter are about measuring the valve parameters according to spool positions , single actuator flow rate control by the calculated flow rate feedback control method , free flow rate dividing control under the sufficient pump discharge flow rate situation , proportion flow rate dividing and flow rate dividing based on meter - in flow rate feedback control method under insufficient pump discharge flow rate situation . the results of all experiments proved that the method presented in this thesis is an effective way to overcome the unreasonable flow rate dividing when simultaneously operating multi - actuators with different inertia loads 第四章介绍了多执行器复合控制实验系统和实验方法；介绍了实验采用的流量控制的pid算法；并测定了执行器控制阀和阀芯位移相关的系数；做了单个执行器计算流量反馈流量控制、流量足够情况下多执行器流量任意分配、流量不足情况下多执行器按比例调节流量分配和多执行器进油侧流量反馈分流控制实验；通过实验说明了论文提出的分流控制方法能实现大小惯性负载复合操作时的合理分流。
