力士乐叠加式节流阀Z2FS6-2-44/2QV，德国REXROTH全新通知，现货库存，优惠供应；
Z2FS型叠加式单向节流阀
1.结构和工作原理
结构和工作原理:
Z2FS型叠加式单向节流阀是叠加板式阀，它可与相同通径的电磁阀，直动型减压阀等叠加。本阀用于对主轴油路和控制油路的节流。该阀在-个方向节流时，另一个方向通过单向阀直接回油。
如图示的位置，当A腔的压力油流到节流位置的同时，经过小孔也流到了阀芯的后面，此时就形成了固定的节流口。调节螺杆可使节流口开大或关小。选择不同的安装位置，可实现进口或出口节流。
主油路节流:该阀安装在相同通径的方向阀与底板之间时，可改变所控制油缸(或油马达)的速度。
控制油路节流:将该阀安装在电液换向阀的先导电磁阀和主阀之间，它可改变主阀芯的换向速度(即调节换向时间)。
Z2FS型叠加式单向节流阀通过改变节流口断面大小来调节油路流量，实现流量控制。在反向时，油流直接通过单向阀回油。对于6、10 通径选用不同安装位置可实现进口节流或出口节流。对于16、22通径可选不同的型号实现进口节流或出口节流。可同时连接工作油腔的两条油路。
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单向节流阀的结构原理。该阀是管式联接的单向节流阀，其节流口采用轴向三角槽式结构。旋转调节螺母，可改变节流口通流面积的大小，以调节流量。正向流动时起节流阀作用；反向流动时起单向阀作用，这时由于有部分油液可在环形缝隙中流动，可以清除节流口上的沉积物。在阀体2左端有刻度槽，调节螺母3上有刻度，用以标志调节流量的大小。
精密节流阀的结构原理。该阀主要由阀体，调节件和节流套组成。在节流口处实现对从A到B的流动的节流。转动节流杆，可调节节流断面。由于节流口制成薄壁孔，故节流不易受温度的影响。
节流阀和单向节流阀是简易的流量控制阀，它们在定量泵液压系统中的主要作用是与溢流阀配合，组成三种节流调速系统：即进油节流调速系统、回油节流调速系统和旁路节流调速系统。对于执行元件要求往返节流调速的系统可使用两个单向节流阀。节流阀也在容积节流调速回路中使用。这种阀没有压力及温度补偿装置，不能自动补偿载荷及油液粘度变化时造成的速度不稳定，但其结构简单，制造和维护方便。所以在载荷变化不大或对速度稳定性要求不高的一般液压系统中得到广泛应用。
节流阀是通过改变节流截面或节流长度以控制流体流量的阀门。将节流阀和单向阀并联则可组合成单向节流阀。节流阀和单向节流阀是简易的流量控制阀，在定量泵液压系统中，节流阀和溢流阀配合，可组成三种节流调速系统，即进油路节流调速系统、回油路节流调速系统和旁路节流调速系统。节流阀没有流量负反馈功能，不能补偿由负载变化所造成的速度不稳定，一般仅用于负载变化不大或对速度稳定性要求不高的场合。
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节流阀的常见故障及排除
节流阀和单向节流阀的常见故障是流量调节失灵，流量不稳定和内泄漏量增大等。
流量调节失灵
流量调节失灵现象，是指调整调节手轮后出油腔流量不发生变化(简式节流阀无此现象)。引起流量调节失灵的主要原因是阀芯径向卡住，当阀芯在全关位置发生径向卡住时，调整调节手轮后出油腔无流量;阀芯在全开位置或节流口调.节好开度后径向卡住，调整调节手轮出油腔流量不发生变化。发生阀芯径向卡住后应进行清洗，排除脏物。当单向节流阀进、出油腔接反时(接后起单向阀作用)，调整调节手轮后流经阀的流量也不会发生变化。
(二)流量不稳定
节流阀和单向节流阀当节流口调整好并锁紧后，有时会出现流量不稳定现象，特别在最小稳定流量时更易发生。引起流量不稳定的主要原因是锁紧装置松动，节流口部分堵塞，油温升高，以及负载压力发生变化等。
节流口调好并锁紧后，由于机械振动或其它原因会使锁紧装置松动，使节流口过流面积改变，从而引起流量变化。
油液中杂质堆积和粘附在节流口边上，使过流面积减小，引起流量减少。当压力油将杂质冲掉后，使节流口又恢复至原有过流面积，流量也恢复至原来的数值，因此引起流量不稳定。
当流经节流阀的油液温度发生变化时，会使油液的粘度发生变化，也会引起流量不稳定;当负载变化时，压力随之变化，会使节流阀的前后油液压差发生变化，同样也会引起流量不稳定。
防止流量不稳定的措施，除采用防止节流阀堵塞的方法外，还可以采取加强油温控制,拧紧锁紧装置和尽可能使负载压力不发生变化,或少发生变化等措施。
(三)内泄漏量增加
节流阀或单向流阀的节流口关闭时，采用间隙密封配合处必定有泄漏量，故节流阀或单向节流阀不能作为截止阀使用。当密封面磨损过大后，会引起泄漏量增加，有时亦会影响最小稳定流量，此时应更换阀芯。
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