译文：
纯碱专用止回阀说明 一、概况 纯碱专用止回阀外形美观，结构设计合理，止回阀的阀瓣在流体压力作用下开启，介质由进向出口侧。当进口侧压力低于出口侧压力时，阀瓣在复位扭簧、流体压差及本身重力等因素的作动关闭，以防止介质倒流。 二、用途 纯碱专用止回阀适用于公称压力 PN1.0~4.0MPa、公称通径 DN50~1200mm(NPS2~48)、工作196~540℃的各种管路上防止介质倒流。通过选用不同的阀门材质，可适用于二氧化碳、MI、MI AII、半II、硝酸、醋酸、强氧化介质及尿素等多种特种介质。提示：用于二氧化碳介质时，二氧化碳温度控制不能太高，因为二氧化碳气体中的粉尘很容易进空隙，造成阀瓣卡死。根据纯碱行业的长期使用经验，建议二氧化碳温度控制在80~100℃为宜，因为碳控制温度过高，极易造成螺杆压缩机故障。 三、结构特点 1．结构长度短，其结构长度只有传统法兰式止回阀的1/4~1/8； 2．体积小，重量轻，其重量只有传统法兰式止回阀的1/4~1/20； 3．阀瓣在复位扭簧的作用下关闭更加快速、灵敏，水锤压力小； 4．水平管道或垂直管道均可使用，安装方便； 5．流道通畅，流体阻力小； 6．阀瓣孔和阀轴在设计时留有合理的过渡旋转间隙，增加了开启和关闭时阀瓣的灵敏性和密封性； 7．阀瓣角行程旋启，关闭冲击力小； 8．整体结构简单紧凑，造型美观； 9．设有吹堵装置，阀内腔积尘(结晶、结疤、结垢)可定期用高压蒸汽吹扫； 10．使用寿命长，可靠性高。 四：常见事故及xx方法： 连接处渗漏：原因连接螺栓的螺母未不紧或松紧不均匀垫片损坏，xx方法均匀拧紧螺栓、xx污物、更换垫片。 密封泄露：原因密封面上有积尘、结晶、结疤、结垢，xx方法连接吹堵装置，可对阀门密封面定期进行高压蒸汽吹扫。

“ Overview soda special check ”是由提供的国际阀门新闻，译文仅供参考。另外，中国止回阀网还提供相关产品搜索：、、、、等。

原文：
Soda special check shows I. Introduction Soda special check appearance, reasonable structure design, the valve flap valve in the fluid under pressure to open, medium to exit from the Progressive side. When the import side of the pressure below the exit side of the pressure, the valve flap in the reset torsion spring, fluid pressure and factors such as gravity itself turns off to prevent the media back. Second, use Soda special check for the nominal pressure PN1.0 ~ 4.0MPa, nominal diameter DN50 ~ 1200mm (NPS2 ~ 48), the work of 196 ~ 540 ℃ way to prevent the media from a variety of control back. By choosing different valve material, suitable for carbon dioxide, MI, MI AII, semi-II, nitric acid, acetic acid, strong oxidizing medium and urea and other special media. Tip: for carbon dioxide, carbon dioxide temperature control can not be too high, because the carbon dioxide gas in the dust very easily into the gap, causing the valve flap stuck. According to the long-term use of soda ash industry experience, the proposed temperature control of carbon dioxide in the 80 ~ 100 ℃ is appropriate, because the carbon control of high temperature is very likely to screw compressor failure. Third, structural features 1. Structure of short length, the length of its structure only the traditional flange Check Valve 1 / 4 to 1 / 8; 2. Small size, light weight, its weight is only the traditional flange-type check valve 1 / 4 to 1 / 20; 3. Disc under the action of torsion spring in the closed reduction is more rapid, sensitive, water hammer pressure is small; 4. Horizontal or vertical pipe pipe can be used, easy installation; 5. Flow smooth, fluid resistance is small; 6. Flap valve and the valve shaft hole in the design of the transition when leaving a reasonable spin gap, an increase of valve opening and closing valve when the sensitivity and sealing; 7. Swing valve rotary valve, close the impact is small; 8. The overall structure simple and compact, aesthetically pleasing; 9. With wind blocking devices, valve cavity dust (crystalline, scarring, scaling) can be periodically purging with high-pressure steam; 10. Long life and high reliability. 4: Accidents and the elimination method: Junction leakage: the reasons for not connecting bolts nuts loose or uneven elastic gasket is damaged, tighten the bolts evenly to eliminate method to remove dirt, replace the gasket. Seal leaks: Causes sealing surface with dust, mold, scab, scale, method of connection to eliminate wind blocking device on the valve sealing surface can be periodically high pressure steam purge.