Parker比例换向阀工作原理：电液比例换向阀是阀内比例电磁铁输入电压信号产生相应动作，使工作阀阀芯产生位移，阀口尺寸发生改变并以此完成与输入电压成比例压力、流量输出元件。阀芯位移也可以以机械、液压或电形式进行反馈。Parker比例换向阀具有形式种类多样、容易组成使用电气及计算机控制各种电液系统、控制精度高、安装使用灵活以及抗污染能力强等多方面优点，应用领域日益拓宽。
Parker比例换向阀是具有两种以上流动形式和两个以上油口的方向控制阀。是实现液压油流的沟通、切断和换向，以及压力卸载和顺序动作控制的阀门。
Parker比例换向阀按阀的结构形式：滑阀式、转阀式、球阀式、锥阀式。
Parker比例换向阀按阀的操纵方式：手动式、机动式、电磁式、液动式、电液动式、气动式。
Parker比例换向阀按阀的工作位置数和控制的通道数：二位二通阀、二位三通阀、二位四通阀、三位四通阀、三位五通阀等
Parker派克D*6FH系列先导式比例换向阀公称尺寸为CE*0至CETOP25(派克的厂内标准)的D*6FH系列先导式连续调节的换向阀被用于控制和调节流量。该阀具有集成的电子元件，主级王的阀芯位置可调。与标准的阀相比集成的持续的差动回路可提供更高的流量。典型的应用是：流量控制精确和可实现流量调节，在快速/低速特性下的工作运行带有阀芯位置监控例如：压力机控制，动态的位置调节和压力/流量闭环系统调节。
Parker派克先导式比例换向阀D*1FW/D*1FT系列公称尺寸为CETOP5和CE*0的D*1FW和D*1FT系列先导式比例换向阀被用于控制流量。该(D*1FW)采用PWD-400功率放大器进行电控或将集成的电子元件插装在阀上组成一体(D*1FT)。典型的应用是：通过调节斜坡信号可使阀芯柔和换向，以此来减小液压和机械冲击，通过电气方式调节流量/速度可实现机械功能的自动化。
Parker派克先导式比例换向阀D*1FS系列公称尺寸为CETOP3至CE*0的D*1FS系列先导式比例换向阀被用于控制流量。该阀采用EW系列模拟式功率放大器进行电控或采用VRD350/355数字式功率放大器。主阀芯的位置可调。典型的应用是：流量控制精确和可实现流量调节，在快速/低速特性下的工作运行和柔和加速度以及延迟工作特性的改善。
Parker派克直动式比例换向阀D*FW/D*FT系列公称尺寸为CETOP3和CETOP5的直动式(D*FW)换向阀系列是一种用于流量控制的比例阀。该阀(D*FW)采用PWD-400/PCD-400功率放大器进行电控或将集成的电子元件插装在阀上组成一体(D*FT)。典型的应用是：通过调节斜坡信号可使阀芯柔和换向，以此来减小液压冲击和机械冲击，通过电气方式调节流量/速度可实现机械功能自动化。
Parker比例换向阀型号参考：
D41FBB31FC4NS00 D41FBB32FC1NF00 D41FBB32FC1NKW0 D41FBB32FC2NF00 D41FBB32FC4NKW0 D41FBE01FC1NF00 D41FBE01FC4NJW0 D41FBE02FC1NF00 D41FHB01E1NE0047 D41FHB31E1NE00 D41FHB31E1NE0044 D41FHB31ElNE0047 D41FHB31F1NE00 D41FHB31F1NE0040 D41FHB32C1NB0 D41FHB32C1NB00 D41FHB32E2NB00 D41FHB32F2NB00 D41FHE01C1NE00 D41FHE01C2NB00 D41FHE01C4NB00 D41FHE01E4VBOO D41FHE01F1NB0043 D41FHE01F4NB0048 D41FHE02C1NE00 D41FIE01FC4NF0040 D41FTB32FC1NFOO D41FTB32FC4VG00 D41FTE01FC4NF00 D41FTE01FCINF0040 D41FTE01PC4NF0038 D41FTE02FC1NF00 D41FTE02FC4NF00 D41FTE02FC4NF0038 D41FTEO1FC4NF0040 D41FTEO1SC4NF0040 D41FWB00FC4NLW D41FWB32FC1NLW0 D41FBB00FC4NF08X821 D41FBB00FC4NKW0X840 D41FBB31FC1NF00 D41FBB31FC1NKW0 D41FBB31FC2NF00 D41FBB31FC4NF00 D41FBB32FC2NKW0 D41FBB32FC4VKW0 D41FBE01BC1NJW0 D41FBE01BC4NJW0 D41FBE01BK4NKW0 D41FBE01CC4NJE0EE D41FBE01CC4NJW0 D41FBE01FC1NKW0 D41FBE01FC1NS00 D41FBE01FC2NF00 D41FBE01FC2NF08 D41FBE01FC2NJW0 D41FBE01FC2NKW0 D41FBE01FC2NKW8 D41FBE01FC4NF00 D41FBE01FC4NKW0 D41FBE01FC4NM00 D41FBE02BC4NJW0 D41FBE02CC4NJW0 D41FBE02FC1NJW0 D41FBE02FC1NKW0 D41FBE02FC2NKW0 D41FBE02FC4NF00 D41FBE02FC4NG00 D41FBE02FC4NJW0 D41FBE02FC4NKW0 D41FBE02FC4VKW0 D41FBE02FC5NJW0 D41FBE02FC5NKW0 D41FBE03FC4NKW0 D41FBE04FK4NF08 D41FEE01FC2NB00 D41FH D41FHA31C1NB00 D41FHA31C2NB00 D41FHA31F1NB00 D41FHA32C1NB00 D41FHA32C2NE00 D41FHA32F2NB00 D41FHA61B4NB00 D41FHA61C2NB00 D41FHA61F1NB00 D41FHA61F2NB00 D41FHA61F4VB00 D41FHA63E2NB00 D41FHA88F2NB08X726 D41FHB11F1VB00 D41FHB11F1VE00 D41FHB11F2NB08 D41FHB11F4NB00 D41FHB12F1NB00 D41FHB12F4NB00 D41FHB13F4NB00 D41FHB31B2NB00 D41FHB31B4NB00 D41FHB31B4NS00 D41FHB31B5NB00 D41FHB31C1NB00 D41FHB31C1NE00 D41FHB31C2NB00 D41FHB31C2NE00 D41FHB31C2NE00X807 D41FHB31C4NB00 D41FHB31C4NE00 D41FHB31E1NB00 D41FHB31E1NB08 D41FHB31E2NB08 D41FHB31E2NS00 D41FHB31E4NB00 D41FHB31E4NB08 D41FHB31E4NE00 D41FHB31F1NB00 D41FHB31F2NB00 D41FHB31F2NB08 D41FHB31F2NE00 D41FHB31F2NS00 D41FHB31F4NB00 D41FHB31F4NE00 D41FHB31F4VB00 D41FHB32B1NB00 D41FHB32B4NB00 D41FHB32B4NS00 D41FHB32C1NS00 D41FHB32C2NB00 D41FHB32C2NE00 D41FHB32C4NB00 D41FHB32C4NS00 D41FHB32E1NB00 D41FHB32E1VB00 D41FHB32E2NE00 D41FHB32F1NB00 D41FHB32F1NB08 D41FHB32F2NE00 D41FHB32F4NB00 D41FHB32F4NE08 D41FHB32F5NB00 D41FHB34F1NB00 D41FHB34F2NB00 D41FHB34F4NB00 D41FHB61B1NB00 D41FHB61B2NB00 D41FHB61B4NB00 D41FHB61B4VB00 D41FHB61C1NB00 D41FHB61C2NB00 D41FHB61C2NE00 D41FHB61C4NB00 D41FHB61C5NB00 D41FHB61E2NB00 D41FHB61E4NB00 D41FHB61E4NS00 D41FHB61F1NB00 D41FHB61F1VB00 D41FHB61F2NB00 D41FHB61F2NE00 D41FHB61F2VB00 D41FHB61F4NB00 D41FHB61F5NB00 D41FHB63B4NB20 D41FHB63C4NB00 D41FHB63E1NB00 D41FHB63F5NB00 D41FHB83F2NB00 D41FHB83F4NB00 D41FHB83F5NB00 D41FHE01B1NB00 D41FHE01B1NE00 D41FHE01B1NS00 D41FHE01B2NB00 D41FHE01B2NB08X726 D41FHE01B2NE00X807 D41FHE01B4NB00 D41FHE01C1NB00 D41FHE01C1NE00X807 D41FHE01C2NE00X807 D41FHE01C2NS08 D41FHE01C4NE00 D41FHE01C4NS00 D41FHE01C4VB00 D41FHE01C5NB00 D41FHE01E1NB00 D41FHE01E1NB08 D41FHE01E1NE00 D41FHE01E2NB00 D41FHE01E2NB08 D41FHE01E2NE00X807 D41FHE01E2VB00 D41FHE01E4NB00 D41FHE01E4NE00 D41FHE01E5NB08 D41FHE01E5VB00 D41FHE01F1NB00 D41FHE01F1NB08 D41FHE01F1NE00 D41FHE01F1NS00 D41FHE01F1VB00 D41FHE01F2NB00 D41FHE01F2NB08 D41FHE01F2NS00 D41FHE01F2VB00 D41FHE01F4NB00 D41FHE01F4NB08 D41FHE01F4NE00 D41FHE01F4NS00 D41FHE01F5NB00 D41FHE02B1NB00 D41FHE02B1NE00 D41FHE02B2NB00 D41FHE02B4NB00 D41FHE02B4NB08 D41FHE02C1NB00 D41FHE02C1NE00X807 D41FHE02C2VB00 D41FHE02C4NB00