译文：
一、先导阀概述： 换向阀是液压系统中应用最普遍的一种阀类。它的性能如何将直接关系到整个液压系统的性能从而影响系统的运行质量。而大流量换向阀的工作可靠性则主要取决于它的先导阀的换向可靠性[2]。现行的换向阀的先导阀大多为锥阀或针阀类，这些阀常因为工作介质污染而导致系统失灵。其中先导阀构造上的先天不足乃是重要原因。 二、构造与工作原理 先导阀是由湿式阀用电磁铁，阀芯，传动柱塞，阀套，顶针杆，钢球，钢球座，复位弹簧等组成。阀芯与阀体为螺纹联接。传动柱塞一端连接电磁铁衔铁，另一端顶住钢球。因此无论是上端电磁铁的推力还是下端弹簧的作用力都使两钢球与顶针杆成连动关系。顶针杆两端与阀芯之间各有一段环形控制容腔，并分别与阀芯上的径向孔道连通。这是一种二位三通双球常闭式电磁阀。当电磁铁断电时，从P腔进入的压力油直接作用在先导阀的球座上，而复位弹簧的弹性力也同向作用在球座上，使先导阀下阀口关闭，上阀口打开，因而使压力油路与控制油路A阻断，控制油路与回油路T开通。在这种情况下，控制油路处于卸荷状态;当电磁铁得电时，传动柱塞推动上钢球向下移动，上阀口关闭，下阀口打开。因而阻断了控制油路与回油路的通道，与此同时压力油路与控制油路开通。压力油经先导阀的控制容腔进入阀体的斜向孔道使控制油路处于工作状态。 三、先导阀创新设计窍门： 从其结构入手进行创新设计。突出特点是采用了双球阀结构并将其插装在主阀阀体上，从而将其换向可靠性，灵敏度，抗污染能力，寿命等性能指标大为提高，系统的故障率大为降低。经多年使用用户普遍反映良好。 1、首先，传统的先导阀是一个独立部件，通常与主阀通过某种方式连接起来使用。而本设计的创新点在于其先导阀是以阀芯的形式呈现的。它以插装的方式与主阀共用一个阀体。这样不仅省去一个阀体使整体结构大为简化而且作为先导阀可以灵活地插装在各种类型的方向阀上。特别用在电磁多路组合阀上显得更方便。在此局部范围内类似一个通用部件。 2、其次，国内外现行的换向阀中的先导阀大多是针阀或锥阀结构。如美国SAUERSUNDSTRAND公司生产的MC34X型换向阀的两个先导阀就是常闭型二位二通针阀。MC系列产品以其先进技术行销全世界，在我国也有其广大的市场。但是，由于其先导阀是针阀，其座孔孔径很小，再加上主阀的阻尼孔的孔径也小，这只有在工作介质洁净度很高的情况下才能正常工作。否则很容易堵塞。本阀采用双球阀结构，不仅密封性好，泄漏少，而且不存在液压卡紧问题，即使油道中出现较大颗粒的污染物，也不会出现堵塞现象，也能保证液压系统的正常工作。这是它的突出特性。 3、所研制的各种类型的方向控制阀系列，由于采用了具有自主知识产权的结构先进的先导阀，因而使其换向工作可靠，操作灵敏，寿命长。特别是采用了球阀结构使它们抗污染的能力极强，再加上构造简单，使用维护方便，又有价格上的自然优势，因而是液压系统中方向控制阀类替代进口产品的理想液压件。

“ Directional control valve in the pilot valve innovative design tips ”是由提供的国际阀门新闻，译文仅供参考。另外，中国控制阀网还提供相关产品搜索：、、、、等。

原文：
First, an overview of the pilot valve: Valve is the most common application of the hydraulic system of a valve. How its performance is directly related to the performance of the hydraulic system and thus affect the operation of the system quality. The high flow valve job depends mainly on the reliability of its pilot valve for the reliability of [2]. The current valve of the pilot valve or needle valve mostly cone class, the working medium of these valves because of pollution often lead to system failure. Which the pilot valve structure on the inherent but important reason. Second, structure and working principle Pilot valve solenoid valve by the wet, spool, drive plunger, valve sleeve, thimble rod, ball, ball seat, return springs and other components. Thread spool and valve body is connected. Connect one end of solenoid plunger drive armature, the other side of resisted ball. Therefore, the thrust of both the top or bottom of the electromagnet force springs are made of two ball and shot into a relationship with the thimble. Thimble rod ends have a ring and valve control volume between the cavity, respectively and the spool on the radial pore connectivity. This is a 2 Three pairs of ball often closed solenoid valve. When the electromagnet when power from the oil pressure P chamber directly into the pilot valve in the tee, and reset the spring elastic force is also acting with the tee, so I close the valve under the pilot valve, the valve port opens , making the pressure oil circuit and control circuit block A, control circuit and back to asphalt T opened. In this case, the control circuit in the unloading state; when the solenoid was electric, the drive to promote the ball moving down the plunger, the valve port closed, mouth open under the valve. Thus blocking the control circuit and the return oil line of the channel, at the same time the pressure oil circuit and control circuit open. Pilot oil pressure control valve chamber and into the body of the oblique channel to control circuit in a working state. 3, pilot valve innovative design tips: Starting from the structure to creative design. Prominent feature is a dual valve structure and its plug in the main valve body, thereby reversing its reliability, sensitivity, anti-pollution ability, life and other performance greatly improved, the system greatly reduced the failure rate . After years of using the user generally well received. 1, first of all, the conventional pilot valve is a separate component, the main valve is usually connected in some way use. The innovation of this design lies in the form of the pilot valve spool is presented. It is a way to plug in to share a body with the main valve. This not only eliminates the need of a valve so that the overall structure simplified and flexible as a pilot valve can plug in the direction of valve types. Especially with multiple combinations of electromagnetic valve, it seems that more convenient. In this local area, similar to a common component. 2 Second, the existing home and abroad in the pilot valve is a needle valve or conical valve most of the structure. If the United States produced MC34X SAUERSUNDSTRAND two pilot valve type valve is normally closed 2 Two-needle. MC series of products with advanced technology marketing world, in China has its vast market. However, because of its pilot valve is a needle valve, the seat hole diameter is small, together with the main valve orifice of the pore size is small, this is only a high degree of cleanliness in the working media to work properly under the circumstances. Will be very easy to plug. The double ball valve structure, not only sealing, leak less, and there is no hydraulic clamping problems, even if the oil duct in a larger particle contaminants, clogging does not occur, but also to ensure the normal operation of hydraulic system . This is its outstanding characteristic. 3, the development of various types of directional control valve, the use of a proprietary advanced pilot valve structure, and thus make it to work for reliable, sensitive operation, long life. Particularly with the ball valve structure makes them very strong anti-pollution ability, coupled with simple structure and easy maintenance, but also the price of natural advantages, and therefore the direction of the hydraulic system control valve ideal alternative to hydraulic parts imports .