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华中力士乐伺服阀4WRPEH6C5B40L-31/M/24F1产品广泛应用于钢铁、冶金、石油化工、**、船舶制造、煤炭、水泥、电力、汽车、工程机械、食品、林业、纺织、皮革、造纸等行业领域 伺服阀的目的就是:以电控方式实现对流量的节流控制(当然经过结构上的改动也可实现压力控制等),既然是节流控制,就必然有能量损失,伺服阀和其它阀不同的是,它的能量损失更大一些,因为它需要一定的流量来维持前置级控制油路的工作伺服阀的主阀一般来说和换向阀一样是滑阀结构,只不过阀芯的换向不是靠电磁铁来推动,而是靠前置级阀输出的液压力来推动,这一点和电液换向阀比较相似,只不过电液换向阀的前置级阀是电磁换向阀,而伺服阀的前置级阀是动态特性比较好的喷嘴挡板阀或射流管阀。
也就是说,伺服阀的主阀是靠前置级阀的输出压力来控制的,而前置级阀的压力则来自于伺服阀的p,假如p口的压力不足,前置级阀就不能输出足够的压力来推动主阀芯动作。
而我们知道,当负载为零的时候,如果四通滑阀完全打开,p口压力=t口压力+阀口压力损失(忽略油路上的其它压力损失),如果阀口压力损失很小,t口压力又为零,那么p口的压力就不足以供给前置级阀来推动主阀芯,整个伺服阀就失效了。所以伺服阀的阀口做得偏小,即使在阀口全开的情况下,也要有一定的压力损失,来维持前置级阀的正常工作。
伺服阀其实缺点多:能耗浪费大、容易出故障、抗污染能力差、价格昂贵等等等等,好处只有一个:动态性能是所有液压阀中gao的。就凭着这一个优点,在很多对动态特性要求高的场合不得不使用伺服阀,如飞机火箭的舵机控制、汽轮机调速等等。动态要求低一点的,基本上都是比例阀的天下了。美国Parker派克伺服比例阀 D41FHE01C5NB00 D41FHE01E1NB00 D41FHE01E1NB08 D41FHE01E1NE00 D41FHE01E2NB00 D41FHE01E2NB08 D41FHE01E2VB00 D41FHE01E4NB00 D41FHE01E4NE00 D41FHE01E5NB08 D41FHE01E5VB00 D41FHE01F1NB00 D41FHE01F1NB08 D41FHE01F1NE00 D41FHE01F1NS00 D41FHE01F1VB00 D41FHE01F2NB00 D41FHE01F2NB08 D41FHE01F2NS00 D41FHE01F2VB00 D41FHE01F4NB00 D41FHE01F4NB08 D41FHE01F4NE00 D41FHE01F4NS00 D41FHE01F4VB00 D41FHE01F4VE00 D41FHE01F5NB00 D41FHE02B1NB00 D41FHE02B1NE00 D41FHE02B2NB00 D41FHE02B4NB00 D41FHE02B4NB08 D41FHE02C1NB00 D41FHE02C1NE00 D41FHE02C2NB00 D41FHE02C2VB00 D41FHE02C4NB00 D41FHE02C4NE00 D41FHE02C4NS00 D41FHE02C4VB00 D41FHE02E1NB00 D41FHE02E1NE00 D41FHE02E2NB00 D41FHE02E4NB00 D41FHE02E5NB00 D41FHE02F1NB00 D41FHE02F1NE00 D41FHE02F1NS00 D41FHE02F2NB00 D41FHE02F2NE00 D41FHE02F2NS00 D41FHE02F4NB00 D41FHE02F4NE00 D41FHE52B1NB00 D41FHE52B1VB00 D41FHE52B2NB00 D41FHE52B2VB00 D41FHE52B4NB00 D41FHE52B4VB00 D41FHE52C1NB00 D41FHE52C1VB00 D41FHE52C2NB00 D41FHE52C2NE00 D41FHE52C2VB00 D41FHE52C4NB00 D41FHE52C4NE00 D41FHE52C4NS00 D41FHE52C4VB00 D41FHE52C5NB00 D41FHE52E1NB00 D41FHE52E1NE00 D41FHE52E2NB00 D41FHE52E4NB00 D41FHE52E5NB00 D41FHE52F1NB00 D41FHE52F1NE00 D41FHE52F1NS00 D41FHE52F2NB00 D41FHE52F2NE00 D41FHE52F2VB00 D41FHE52F4NB00 D41FHE52F4NE00 D41FHE52F4VB00 D41FHE52F5NB00 D41FHE52F5VB00 D41FHE82C1NB00 D41FHE82C1NE00 D41FSA31C1NLW0 D41FSA31C1NXW0 D41FSA31C4NXW0 D41FSA32C1NLW0 D41FSA32C2NXW0 D41FSA32C4NLW0 D41FSB11C1NLW0 D41FSB11C1NXW0 D41FSB12C2NLW0 D41FSB12C2NXW0 D41FSB12C4NXW0 D41FSB16C1NLW0 D41FSB31C1NXW0 D41FSB31C4NLW0 D41FSB31C4NXW0 D41FSB31C4NXW8 D41FSB32C1NLW0 D41FSB32C1NXW0 D41FSB32C2NLW0 D41FSB32C2NXW0 D41FSB32C4NLW0 D41FSB32C4NXW0 D41FSB34C2NXW0 D41FSB34C4NXW0 D41FSE01C1NLW0 D41FSE01C1NXW0 D41FSE01C2NLW0 D41FSE01C2NLW8 D41FSE01C2NXW0 D41FSE01C2NXW8 D41FSE01C4NLW0 D41FSE01C4NXW0 D41FSE01C5NLW0 D41FSE01C5NLW8 D41FSE01C5NXW0 D41FSE01C5NXW8 D41FSE01C5VLW0 D41FSE02C1NLW0 D41FSE02C1NXW0 D41FSE02C1VXW0 D41FSE02C2NLW0 D41FSE02C4NLW0 D41FSE02C4NXW0 D41FSE02C4VXW0 D41FSE04C4NLW0 D41FSE04C4NXW0 D41FSE06C1NXW0
D41FSE06C4NXW0 D41FTB31FC1NF00 D41FTB31FC1NF10 D41FTB31FC1NG00 D41FTB31FC2NF00 D41FTB31FC2NG00 D41FTB31FC4NF00 D41FTB31FC4NF10 D41FTB31FC4NG00 D41FTB31FC5NF00 D41FTB31FC5VG00 D41FTB32FC1NF00 D41FTB32FC1NG00 D41FTB32FC1VF00 D41FTB32FC2NF00 D41FTB32FC2NG00 D41FTB32FC4NF00 D41FTB32FC4NG00 D41FTB32FC4VF00 D41FTB32FC5NF00 D41FTB32FC5NG00 D41FTE01FC1NF00 D41FTE01FC1NG00 D41FTE01FC1VF00 D41FTE01FC2NF00 D41FTE01FC2NG00 D41FTE01FC4NF00 D41FTE01FC4NF08 D41FTE01FC4NG00 D41FTE02FC1NF00 D41FTE02FC1NF10 D41FTE02FC1NG00 D41FTE02FC1VF00 D41FTE02FC2NF00 D41FTE02FC2NG00 D41FTE02FC4NF00 D41FTE02FC4NG00 D41FTE02FC4VF00 D41FTE02FC5NF08 D41FTE03FC1NF00 D41FTE04FC1NF00 D41FTE04FC4NF08 D41FTE05FC4NG00 D41FTE80FC4NF00 D41FWA31FC4NLW0 D41FWA32FC1NLW0 D41FWA32FC4NLW0 D41FWB31FC1NLW0 D41FWB31FC1NXW0 D41FWB31FC1VLW0 D41FWB31FC2NLW0 D41FWB31FC4NLW0 D41FWB31FC4VLW8 D41FWB31FC5NLW0 D41FWB31FC5VLW8 D41FWB32FC1NLW0 D41FWB32FC1VLW0 D41FWB32FC2NLW0 D41FWB32FC2NXW0 D41FWB32FC2VLW0 D41FWB32FC4NLW0 D41FWB32FC4NXW0 D41FWB32FC4VLW0 D41FWB32FC5NLW0 D41FWB32FC5VLW0 D41FWE01FC1NLW0 D41FWE01FC1NXW0 D41FWE01FC2NLW0 D41FWE01FC2NLW8 D41FWE01FC2NXW0 D41FWE01FC2VLW0 D41FWE01FC4NLW0 D41FWE01FC4NXW0 D41FWE01FC4VLW0 D41FWE02FC1NLW0 D41FWE02FC1NLW8 D41FWE02FC1NXW0 D41FWE02FC1VLW0 D41FWE02FC2NLW0 D41FWE02FC2NXW0 D41FWE02FC4NLW0 D41FWE02FC4NXW0 D41FWE02FC4VLW0 D41FWE02FC5NLW0 D41FWE02FC5NXW0 D41FWE03FC2NLW0 D41FWE03FC4NLW0 D81FHA31E1NB00