SMC减压阀AR20-01B-A是通过调节，将进口压力减至某一需要的出口压力，并依靠介质本身的能量，使出口压力自动保持稳定的阀门。SMC减压阀是一个局部阻力可以变化的节流元件，即通过改变节流面积，使流速及流体的动能改变，造成不同的压力损失，从而达到减压的目的。SMC减压阀然后依靠控制与调节系统的调节，使阀后压力的波动与弹簧力相平衡，使阀后压力在一定的误差范围内保持恒定。
SMC减压阀作用及工作原理
1、减压稳压阀
主要特点：1、DN65口径以上活塞式。替了膜片提高寿命3倍以上；2、DN50口径以下，用尼龙强化橡胶的平膜片代替了原来的膜片，也提高寿命3倍以上。适用介质：水、空气。介质温度：0~90°C。
2、波纹管减压阀
本阀用于温度在180C以下的蒸汽、空气及其它无腐蚀性气体的管路上，经过调节，使通过阀内的介质压力减至某一需要的出口压力，并使介质的出口压力保持相对稳定，但进口压力与出口压力之差必须大于或等于0.5bar。
SMC大流量精密减压阀阀瓣采用进出口两端中心轴导向，启闭灵活，可水平定装或垂直安装。阀瓣采用弹簧加载，其快速关闭能有效地减小水锤压力，密封性能好，关闭无噪声。止回阀具有体积小、重量轻、流体阻力小、耐疲劳、寿命长等优点，产生的的作用是只允许介质向一个方向流动，而且阻止方向流动。通常止回阀是自动工作的，在一个方向流动的流体压力作用下，阀瓣打开；流体反方向流动时，由流体压力和阀瓣的自重合阀瓣作用于阀座，从而切断流动。不宜用于含有固体颗粒和粘度较大的介质。缓闭消声止回阀具有开启和关闭速度调控的逆止功能,适用于工矿企业,高层建筑由水泵直接给排水系统中,减小水锤及水击现象产生,已达到安全关闭的效果。缓闭消声止回阀是一种阀门，止回阀具有结构新颖，设计合理，密封效果好，阻力小，流量大，使用寿命长等特点。能控制主阀开启或关闭的速度，可配合现场调至工作状态，能完全消除水锤现象，达到缓闭消声的效果。
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美国：美国NUMATICS纽曼蒂克，美国PARKER派克气动液压，美国VICKERS威格士，美MOOG穆格，美国FAIRCHILD,美国POSEMOUNT罗斯蒙特，美国艾默生EMERSON,美国哈希HACH,美国丹尼逊液压元件，美国克力帕
德国：德国HAWE哈威，德国REXROTH力士乐，德国HYDAC贺德克，德国E H，德国博力谋BELIMO
日本：日本油研YUKEN，日本不二越NACHI，日本黑田精工，日本丰兴TOYOOKI，日本大金液压DAIKIN，日本东机美
意大利：意大利ATOS阿托斯
