retz进口轴流式止回阀 贯流式逆止阀性能描述 performance description
轴流式止回阀，贯流式逆止阀具有双重密封阀座结构，独特的文丘里流线型流道设计并设有导流体，达到零泄漏的效果，具有流体阻力小、水击压力小、流态好，可有效防止液体倒流时产生的水锤冲击和噪音等优点，是油气集输管网、给排水系统，特别适合于输油泵出口和天然气压缩机出口axial flow check valves and through flow check valves h**e a double sealed valve seat structure, a unique venturi streamlined flow channel design, and are equipped with fluid guides to achieve zero leakage. they h**e the advantages of low fluid resistance, low water hammer pressure, good flow pattern, and can effectively prevent water hammer impact and noise generated during liquid backflow. they are oil and gas gathering and transportation pipelines, water supply and drainage systems, especially suitable for oil pump outlets and natural gas compressor outlets
进口轴流式止回阀 贯流式逆止阀慨述 express with regret
轴流式止回阀（贯流式逆止阀）具有一般止回阀的功能外，它还设计有减震弹簧，具有消声，减震效果。独特的轴流式结构具有流阻小流量大，外形尺寸小等特点，适用于油、气、水浆液等管道系统，防止介质逆流，使用具有流阻系数小、水击压力小、噪音低、流动性能好、响应速度快等优点。
主要特点design features
弹簧的的推力使阀瓣在即使用无介质压力作用时，也能处理关闭位置 the thrust of the spring enables the disc to handle the closed position even when no medium pressure is applied
良好的支承方式使阀门无论处于什么安装位置时阀瓣和阀座均能良好对中，故阀门可任意角度安装 good support mode enables the valve disc and valve seat to be well aligned no matter where the valve is installed, so the valve can be installed at any angle
阀套外形的流线型设计与体腔流线型设计的组合构成了轴流式止回阀流线型流道，精确的计算和设计使流道的过流面积充分且保持一致，压力损失小，流态稳定，无气蚀。阀瓣在介质流动时产生负压及弹簧推力下回座，无介质对阀瓣背面直接冲击；因此，轴流式止回阀是低噪音阀门 the streamline design of the valve sleeve shape and the streamline design of the body c**ity constitute the streamline flow passage of the axial flow check valve. accurate calculation and design make the flow passage h**e sufficient and consistent flow area, small pressure loss, stable flow pattern and no c**itation. when the medium flows, the valve clack will generate negative pressure and spring thrust to reseat, and no medium will directly impact the back of the valve clack; therefore, the axial flow check valve is a low-noise valve
阀瓣前后两端支承和阀瓣轴的特殊表面处理及结构设计，克服了类似阀门使用过程中经常发生的卡阻现象，启闭平稳同时避免了因重力因素造成阀瓣对中性差，密封副受力不均，两次动作间密封副吻合部 位不一致而影响密封性能的缺陷，使密封副始终处于良好的受力和吻合状态 the special surface treatment and structural design of the supports at the front and rear ends of the valve clack and the valve clack shaft h**e overcome the blocking phenomenon that often occurs during the use of similar valves. the valve clack can be opened and closed smoothly, and at the same time, the valve clack can **oid the neutral difference caused by gr**ity, the uneven force on the sealing pair, and the defects that affect the sealing performance due to the inconsistent fitting position of the sealing pair between two actions, so that the sealing pair is always in a good stress and coincidence state
精确的设计使用弹簧推力在阀瓣处于关闭位置时略大于阀瓣重力及阀瓣和前后支承间的磨擦力之和，阀瓣既可在低压力及任意安装时回座密封，又能实现低压开启，减低泵启动载荷，保护泵的运行安全 precise design uses spring thrust which is slightly greater than the sum of the gr**ity of the valve flap and the friction between the valve flap and the front and rear supports when the valve flap is in the closed position. the valve flap can not only be reseated and sealed at low pressure and at any time of installation, but also be opened at low pressure to reduce the starting load of the pump and protect the safe operation of the pump.
防火设计，符合api 6fa,阀门无介质外漏可能 the fire protection design conforms to api 6fa, and the valve has no possibility of medium leakage
技术规范 technical specifications
通径：1”~12” (dn25~300)
压力等级：ansi/asme 150lb~600lb(pn1.6~10.0mpa)
适用温度：-40~500℃
连接方式：法兰、对焊。
设计依据design basis：gb、api/asme
设计标准design standard：gb/t21387、api6dasmeb16.34
结构长度face-to-face：gb/t12221、api6dasmeb16.10
连接端*connection end：法兰连接flanged、gb/t9113、asmeb16.5
抗硫材料要求materials：nace mro175
试验和检验test and check：gb/t 26480、api598
阀门连接端的连接法兰标准和对焊端尺寸可按用户要求设计制造。
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