原文：
一、查新项目的科学技术要点 ㈠研究目的 上装式偏心O型球阀应用于压水堆核电厂反应堆系统。 公司在核电领域已有十多年的接触和往来，为秦山二期核电站提供了核级温度自力式调节阀、J21Y根阀、H764型止回阀，对核法规和标准有较深了解，为国产化取代进口作出一定贡献。所以，公司决定设计开发压水堆核电厂球阀。 ㈡研究内容和结果 ⒈构成：上装式偏心O型球阀由气动活塞式执行机构、球阀及附件构成。 ⒉工作原理：输入一定气源压力使气动活塞式执行机构输出90°的角位移来控制球阀的开关。 ⒊用途：该阀用于压水堆核电厂反应堆系统内流体的切断功能。 ⒋工艺方法：承压件（阀体、上装盖）有金属模铸造成型，阀体焊接端口进行无损探伤检测。 ⒌主要技术参数：安全等级：核3级； 抗震类别：NS； 公称压力：1.6MPa～6.4MPa； 公称通径：25mm～200mm； 适用温度：-60℃～350℃； 设计寿命：≥60年； 密封性能：零泄漏。 二、查新点与查新要求 ⒈偏心结构：因普通的O型球阀在开启关闭过程中，密封面间是相互摩擦的，通过阀体的偏心结构设计，实现了球阀密封面在开启时迅速地脱离阀座密封面，在旋转过程中密封面间不产生摩擦，降低了阀杆的操作扭矩，提高了密封面的使用寿命； ⒉单阀座结构设计：普通的O型球阀都是双阀座结构，这种结构不但增加了一个密封面，同时还存在内腔压力无法排放的问题，通过单阀座设计，既降低了阀杆操作扭矩，同时也避免了双阀座密封的内腔压力升高问题； ⒊阀芯结构的优化设计：传统型的单阀座密封球阀产品都存在阀芯的结构强度较低的特点，这里通过对阀芯结构的优化设计，增强了阀芯的结构强度和密封面的稳定性； ⒋操作方式的优化设计：传统的轨道式球阀是通过阀杆的上下运动来带动球芯的转动，从而实现密封的，这种方式对阀门上部空间的高度要求比较高，限制了产品的应用场合，现在直接通过阀杆的转动来带动球芯，这种操作方式大大降低了对阀门上部的空间要求，扩大了产品的应用场合。

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译文：
First, check points of the new science and technology projects I research purposes Top entry ball valve eccentric O-reactor system used in pressurized water reactor nuclear power plant. In the field of nuclear power more than a decade of contacts and exchanges, provided for the Qinshan 2 nuclear power plant nuclear temperature Self-regulating valve, J21Y root valve, H764-type check valve, regulations and standards on nuclear deeper understanding of the domestic make some contribution to the import of replacement. Therefore, the company decided to design and development of pressurized water reactor nuclear power plant valve. Ii research content and results ⒈ form: Top entry ball valve eccentric O piston by the pneumatic actuator, ball valve and accessories form. ⒉ it works: enter some gas source pressure pneumatic piston actuator output of the angular displacement of 90 ° to control the ball switch. ⒊ use: the valve for the pressurized water reactor nuclear power plant reactor system, fluid cutting function. ⒋ Process Method: Pressure parts (body, upload cap) caused by a metal molded type, body welding non-destructive flaw detection port. ⒌ main technical parameters: level of security: nuclear grade 3; Seismic Category: NS; Nominal pressure: 1.6MPa ~ 6.4MPa; Nominal diameter: 25mm ~ 200mm; Applicable temperature: -60 ℃ ~ 350 ℃; Design Life: ≥ 60 year; Sealing: zero leakage. Second, check for new spots and check for new requests ⒈ eccentric structure: common O-type ball valve for opening the closed process, the sealing surfaces are rubbing against each other, through the valve body eccentric structure design, implementation of the valve sealing surface when opened quickly from the seat sealing surface, In the rotation process does not produce friction between the sealing surface, reducing the operating valve stem torque, increase the service life of the sealing surface; ⒉ single-seat structure design:common O-ball is double seat structure, which not only adds a sealing surface, there is also the issue cavity pressure can not discharge through the single-seat design, not only reduces the Stem operating torque, while avoiding the double-seat seal cavity pressure rise problem; ⒊ spool optimizing the structure design: traditional single-seat valve seal ball valve products are present the characteristics of the structural strength of the lower, where the spool through the structure of optimal design, enhances the structural strength and valve sealing surface stability; ⒋ mode of operation of the optimal design: the traditional track-type ball valve through the valve stem to bring the ball up and down movement of the rotating core in order to achieve sealing, and in this way the upper space of the valve height requirement is relatively high, limiting the product applications, is now directly through the valve stem rotation to drive the ball core, this mode of operation greatly reduces the space requirements of the upper valve and expanded product applications.