進口低阻力燃氣止回閥，液化氣，天然氣逆止閥慨述 Express with regret

低阻力燃氣止回閥（天然氣逆止閥）是采用尼龍或PTFE為密封面，軟密封材料閥座性能可靠，減緩介質壓力的沖擊，防止靜電而產生了火花，保護閥門及管道，適用燃氣管道控制接通和截斷管路介質的啟閉裝置，阻止介質逆流 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

技術參數 Technical paramete

通徑:1/2”~12” (DN15~300)

開起壓力：1000kpa-2.5Mpa

連接方式：法蘭

進口低阻力燃氣止回閥，液化氣，天然氣逆止閥結構特點 StructureFeatures

優質材質制造，殼體不易穿孔 Made of high-quality materials, the shell is not easy to pierce

防靜電,防止火花產生 Anti static to prevent sparks

彈性密封,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夠正常工作 Normal operation in horizontal or vertical rising position

密封材料特點說明 Description of sealing material characteristics

聚四氟乙烯（PTFE）

優點∶耐溫（-196~120℃），耐腐∶耐強酸強堿、水和各種有機溶劑。無毒害/不粘附/高潤滑/耐氣候。機械性質較軟，有“塑料王”之稱 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"

主要零件與材質Main Parts and Materials

1、旋啟式結構：閥瓣利用流體壓差和自身重力實現旋轉運動，流阻系數小，適用于大部分的貯罐區垂直管路上，自動阻止介質逆流，保證上游設備 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∶本閥可垂直水平安裝，垂直安裝介質必須有下向上 Note: The valve can be installed vertically and horizontally, and the vertical installation medium must be downward and upward

2、升降式結構：閥瓣利用流體壓差和自身的重量實現升降，適用于水平管路上，自動阻止介質逆流，保護上游設備 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∶本閥在管路上，只能水平安裝 Note: This valve is installed horizontally on the pipeline only

3、立式止回結構：閥瓣利用流體壓差和自身的重量實現升降，適用于大部份的罐區垂直管路上，自動阻止介質逆流，保護上游設備 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∶本閥只能垂直安裝，介質有下向上 Note: The valve can only be installed vertically, and the medium is downward and upward

可能發生的故障及其解決方案 Possible faults and solutions

故障現象	圖象	原因	消除方法
閥蓋連接處泄漏		1. 螺栓未擰緊或松緊不均勻. 2. 法蘭密封有損傷或夾有污物 3. 墊片失效.	1. 均勻擰緊螺栓. 2. 修整密封面或清除污物 3. 更換墊片.
密封面泄漏		1. 密封面間夾有污物 2. 密封面有損傷	1. 清除干凈. 2. 修整填料體密封面或更換PTFE密封墊。