进口低阻力燃气止回阀，液化气，天然气逆止阀慨述 Express with regret

低阻力燃气止回阀（天然气逆止阀）是采用尼龙或PTFE为密封面，软密封材料阀座性能可靠，减缓介质压力的冲击，防止静电而产生了火花，保护阀门及管道，适用燃气管道控制接通和截断管路介质的启闭装置，阻止介质逆流 RETZ The gas check valve (natural gas check valve) uses nylon as the sealing surface. The soft sealing material has reliable valve seat performance, which can reduce the impact of medium pressure, prevent sparks caused by static electricity, protect the valve and pipeline. It is suitable for the gas pipeline to control the opening and closing of connecting and cutting off the pipeline medium, and prevent the reverse flow of medium

技术参数 Technical paramete

通径:1/2”~12” (DN15~300)

开起压力：1000kpa-2.5Mpa

连接方式：法兰

进口低阻力燃气止回阀，液化气，天然气逆止阀结构特点 StructureFeatures

优质材质制造，壳体不易穿孔 Made of high-quality materials, the shell is not easy to pierce

防静电,防止火花产生 Anti static to prevent sparks

弹性密封,性能可靠,不易泄漏 Elastic seal, reliable performance, not easy to leak

在水平或垂直上升位置能够正常工作 Normal operation in horizontal or vertical rising position

密封材料特点说明 Description of sealing material characteristics

聚四氟乙烯（PTFE）

优点∶耐温（-196~120℃），耐腐∶耐强酸强碱、水和各种有机溶剂。无毒害/不粘附/高润滑/耐气候。机械性质较软，有“塑料王”之称 Advantages: temperature resistance (- 196~120 ℃), corrosion resistance: resistance to strong acids and alkalis, water and various organic solvents. No poison/no adhesion/high lubrication/weather resistance. The mechanical property is relatively soft, so it is known as the "King of Plastics"

主要零件与材质Main Parts and Materials

1、旋启式结构：阀瓣利用流体压差和自身重力实现旋转运动，流阻系数小，适用于大部分的贮罐区垂直管路上，自动阻止介质逆流，保证上游设备 Swing structure: the valve clack uses the fluid pressure difference and its own gravity to realize rotary movement, with small flow resistance coefficient, which is applicable to most vertical pipelines in the tank area, automatically prevents the medium from flowing backward, and ensures the upstream equipment

注∶本阀可垂直水平安装，垂直安装介质必须有下向上 Note: The valve can be installed vertically and horizontally, and the vertical installation medium must be downward and upward

2、升降式结构：阀瓣利用流体压差和自身的重量实现升降，适用于水平管路上，自动阻止介质逆流，保护上游设备 Lifting structure: the valve clack uses the fluid pressure difference and its own weight to achieve lifting, which is suitable for horizontal pipelines, automatically prevents the medium from flowing backward, and protects upstream equipment

注∶本阀在管路上，只能水平安装 Note: This valve is installed horizontally on the pipeline only

3、立式止回结构：阀瓣利用流体压差和自身的重量实现升降，适用于大部份的罐区垂直管路上，自动阻止介质逆流，保护上游设备 Vertical check structure: the valve clack uses the fluid pressure difference and its own weight to achieve lifting and lowering, which is applicable to most of the vertical pipelines in the tank farm. It can automatically prevent the reverse flow of media and protect upstream equipment

注∶本阀只能垂直安装，介质有下向上 Note: The valve can only be installed vertically, and the medium is downward and upward

可能发生的故障及其解决方案 Possible faults and solutions

故障现象	图象	原因	消除方法
阀盖连接处泄漏		1. 螺栓未拧紧或松紧不均匀. 2. 法兰密封有损伤或夹有污物 3. 垫片失效.	1. 均匀拧紧螺栓. 2. 修整密封面或清除污物 3. 更换垫片.
密封面泄漏		1. 密封面间夹有污物 2. 密封面有损伤	1. 清除干净. 2. 修整填料体密封面或更换PTFE密封垫。