译文：
旋启式止回阀又称单向阀或逆止阀，其作用是防止管路中的介质倒流。启闭件靠介质流动和力量自行开启或关闭，以防止介质倒流的阀门叫止回阀。止回阀属于自动阀类，主要用于介质单向流动的管道上，只允许介质向一个方向流动，以防止发生事故。 一，旋启式止回阀用途： 旋启式止回阀适用于公称压力PN1.0MPa~42.0MPa、Class150-2500；公称通径DN15~1200mm、NPS1/2~48；工作温度－196~540℃的各种管路上，用于防止介质倒流。通过选用不同的材质，可适用于水、蒸汽、油品、硝酸、醋酸、强氧化性介质及尿素等多种介质。 二，旋启式止回阀主要材质有： 碳钢、低温钢、双相钢（F51/F53）、钛合金、铝青铜、因科镍尔（INCONEL625）、SS304、SS304L、SS316、SS316L；铬钼钢、蒙乃尔（400/500）、20#合金，哈氏合金等金属材料 三，旋启式止回阀标准与规范 1、设计与制造：API594、API6D、JB/T8937 2、结构长度：API594、API6D、DIN3202、JB/T8937 3、压力一温度等级：SNSIB16.34、DIN2401、GB/T9124、HG20604、HG20625、SH3406、JB/T74 4、试验与检验：API598、JB/T9092 5、配管法兰：JB/T74~90、GB/T9112!9124、HG20592~20635、SH3406、ANSIB16.5、DIN2543~2548、GB/T13402、API605、ASMEB16.47 四，旋启式止回阀结构特点 1、结构长度短，其结构长度只有传统法兰止回阀的1/4~1/8 2、体积小、重量轻、其重量只有传统法兰止回阀的1/4~1/20 3、阀瓣关闭快速，水锤压力小 4、水平或垂直管道均可使用，安装方便 5、流道通畅、流体阻力小 6、动作灵敏、密封性能好 7、阀瓣行程短、关阀冲击力小 8、整体结构、简单紧凑、造型美观 9、使用寿命长、可靠性高 五，旋启式止回阀作用原理及结构说明 1 作用原理：通过汽缸塞的上下移动，协助阀瓣快速启闭以达到密封面 2 结构说明 A 结构形式：旋启式单阀瓣 B 驱动方式：对焊连接 C 连接形式：对焊连接 D 阀门的开启和关闭由气动装置来控制，加快阀门的开启和关闭速度。 六，旋启式止回阀维护、保养与安装、使用 （一）维护与保养 1该旋启式止回阀应存放在干燥通风的室内，做到防潮、防雨、防锈。 2 存放月运输时启闭件应处于关闭装置，同时应做好以下工作： a 阀瓣应固定于开启位置 b 通径两端内口用泡沫板堵塞，端口须用闷盖塞紧，予以防尘、防锈，保持通道清洁和端面的平整； c 汽缸部位进行适当的包装防护、防震和防碰； d 阀门放置时应平稳，气动驱动装置朝上，不得相互受挤。 3 长久放置时应定期检查。每三个月对两通道、密封面上的污垢和锈迹，焊接口的防护状况进行检查，擦拭污垢和锈迹后，重新涂刷防锈油予以防护。 七，旋启式止回阀安装与使用 1 抽汽止回阀垂直安装在水平管道上，使用是一般处于全开状态。 2 安装前应先进行以下工作 A卸掉旋启式止回阀通道两端的闷盖和泡沫板，清洁内腔，去除油垢； B剥去阀瓣表面上的油纸，去除阀瓣面上的油垢； 3 安装时介质的流向必须限制。 4 通过管路的介质不应带有硬质颗粒，以免损伤密封面 5 该旋启式止回阀出厂前以逐台进行检验和试验合格，安装单位可直接压力试验或安装使用。

“ Basic knowledge of Swing Check Valve”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：
Swing check valve, also known as one-way valve, check valve, and its role is to prevent the line of medium back. Opening and closing pieces by medium flow and the forces to open or close the valve to prevent the media called back check valve. Check valves are automatic valves, mainly for one-way flow of media channels, only allowing media to flow in one direction, to prevent accidents. 1, Swing Check Valve uses: Swing check valves suitable for nominal pressure PN1.0MPa ~ 42.0MPa, Class150-2500; nominal diameter DN15 ~ 1200mm, NPS1 / 2 ~ 48; operating temperature range of -196 ~ 540 ℃ on the pipe to prevent medium back. By choosing different materials, applicable to water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea and other media. Second, swing check valve main materials are: Carbon steel, low temperature steel, dual phase steel (F51/F53), titanium alloys, aluminum bronze, Inconel Seoul (INCONEL625), SS304, SS304L, SS316, SS316L; Cr-Mo steel, Monel (400/500), 20 # alloy, Hastelloy and other metal materials 3, swing check valve standards and specifications 1, the design and manufacture: API594, API6D, JB/T8937 2, the structure length: API594, API6D, DIN3202, JB/T8937 3, the pressure temperature rating: SNSIB16.34, DIN2401, GB/T9124, HG20604, HG20625, SH3406, JB/T74 4, testing and inspection: API598, JB/T9092 5, with flange: JB/T74 ~ 90, GB/T9112! 9124, HG20592 ~ 20635, SH3406, ANSIB16.5, DIN2543 ~ 2548, GB/T13402, API605, ASMEB16.47 Fourth, structural features of Swing Check Valve 1, the structure length is short, only the length of the structure of traditional flange check valve 1 / 4 to 1 / 8 2, small size, light weight, its weight is only the traditional flange check valve 1 / 4 to 1 / 20 3, valve valve quickly, the water hammer pressure of small 4, horizontal or vertical pipe can be used, easy installation 5, flow smooth, fluid resistance 6, movement sensitive, good sealing performance 7, valve flap short trip, off valves wallop 8, the overall structure, simple and compact, attractive appearance 9, long life, high reliability 5, swing check valve mechanism and the structure shows One of principle: move up and down through the cylinder plug to facilitate rapid opening and closing the valve flap to achieve the sealing surface 2 Structural Description A structure: single-disc swing B Drive: butt connection C Connection: welded connection D valve is opened and closed by the pneumatic device to control and to accelerate the valve opening and closing speed. 6, swing check valves to maintain, maintenance and installation, use (A) Maintenance 1 The swing check valves should be stored in dry and ventilated room, so that moisture, rain, rust. 2 store opening and closing documents on transportation should be at the closing device, and also should do the following: a valve flap should be fixed in the open position b path ends with a foam board to plug in port, the port to be plugged with a boring cover, to dust, rust, clean and maintain the channel end of the formation; c cylinder parts to the appropriate protective packaging, shock and anti-collision; d valve should be placed on a smooth, pneumatic drive upwards, not with each other by the crowd. 3 long-term placement should be regularly checked. Every three months on two channels, sealing surface dirt and rust, welding protection status of the mouth of inspection, wipe dirt and rust, the re-brushing to be protective anti-rust oil. 7, swing check valve installation and use of A vertical extraction steam check valves installed in horizontal pipelines, the use of a general in the fully open state. 2, the following work to install preceded A removal of the swing check valves at both ends of the boring channels cover and foam board, cleaning cavity, remove the grease; B stripped disc on the surface of oiled paper, to remove grease disc surface; 3, the flow of the installation media must be limited. 4 through the pipe with the media should not be hard particles, so as not to damage the sealing surface 5, the swing check valve factory to carry out inspection and testing by qualified units, the installation unit can be directly pressure test or installation.