SL20PA4-4X液控单向阀

SL20PA4-4X液控单向阀 德国博世力士乐REXROTH液控单向阀 电磁阀 电磁换向阀 原装现货

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SL20PA4-4X液控单向阀

方向控制阀

类型:单向阀、换向阀

一、单向阀

类型:普通单向阀、液控单向阀

1、普通单向阀

作用:只允许油液沿一个方向流动，不允许油液反向倒流(起止回作用)

对单向阀的性能要求:

(1) 正向导通时，压力损失要小;

(2)反向截止时，密封性要好。

2、

液控单向阀

作用:

(1)起止回作用;

(2)必要时解除逆止，允许油液反向通过。

3、单向阀用途

(1)止回作用:安装在泵的出口，p.=0.3~0.5 bar

(2)作背压阀用:防止液压缸前冲或爬行，使系统作平稳。

(3)作锁紧装置用:起重机支腿、夹紧回路等。

(4)保持控制油路有必要的压力: Pr≥P液挖

(5)作复合阀使用:单向节流阀、单向顺序阀、单向减压阀、单向调速阀等。

(6)局部回路作安全阀使用: Ppr>P换热器正常工作的距力

液控单向阀是依靠控制流体压力，可以使单向阀反向流通的阀。这种阀在煤矿机械的液压支护设备中占有较重要的地位。液控单向阀与普通单向阀不同之处是多了一个控制油路K，当控制油路未接通压力油液时，液控单向阀就象普通单向阀一样工作，压力油只从进油口流向出油口，不能反向流动。当控制油路有控制压力输入时，活塞顶杆在压力油作用下向右移动，用顶杆顶开单向阀，使进出油口接通。若出油口大于进油口就能使油液反向流动。

SL20PA4-4X液控单向阀

在液压系统中使用单向调速阀，用于影响液压马达和气缸的速度，且不受负载支配（防止失控）。此外，管道破裂安全阀具有隔离功能。

单向调速阀基本由以下部件构成：壳体（1）、主提升阀（2）、先导部分（3）、先导滑阀（4）、阻尼滑阀（5）和先导阻尼阀（6）。

通过自由流动

将负载从 A 提升至 B 时，主滑阀（2）打开。如果负载压力出现问题（如：方向阀与油口 A之间管路破裂），主滑阀（2）会立即关闭。将负载侧（7）与弹簧腔8）连接起来，即可实现此功能。

降低负载（回路示例）

流动方向是从 B 流至 A。油口 A 通过方向阀连接到油箱。气缸活塞杆侧的流量与工况相对应。油口 X 上的控制压力与油口 B 上的负载压力 之间的关系为= 1:20.

达到控制压力时，主滑阀会提前打开。通过控制滑阀（4），将先导级（3）抬起，其底座和腔室（8）通过此钻孔和油口 A 减压到油箱中。同时，油口 B 内的负载压力不再施加到腔室（8）上，而是在主滑阀内。主提升阀（2）上的负载因此被卸除。位于主提升阀（2）上的控制滑阀（4）的背面，抵靠在阻尼滑阀（5）轴环上。

油口 X 上用于开启 B 到 A 所需的压力此刻仅受腔室（9）内的弹簧影响。用于开启 B 到 A 连接所需的压力为 20 bar；要完全开启此连接，较大需要 70 bar 的压力，具体情况视型号而定。

控制流量的开口横截面逐渐增加。通过以下方式实现：衬套和主提升阀（2）的径向钻孔依次打开。

控制压力、破裂压力和压差之间的关系确定了通过 B 到 A的连接流入致动器的流量。因此，防止了致动器出现不受控制的情况。

即使方向阀与油口 A 之间出现管道破裂，也不会影响到下降程序的控制。

影响单向调速阀开启和关闭时间的指导原则

通过位于控制滑阀（4）中以及阻尼滑阀（5）两侧的节流孔（6）调整开启顺序。节流孔（6）受筛网保护。

SL20PA4-4X液控单向阀型号

力士乐REXROTH单向阀，先导式Z2S 32

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溢流阀是压力控制阀。其作用主要是控制系统压力，以保护油泵和油路系统的安全及保持油路系统的压力恒定。通经为8毫米的溢流阀是一个小型的直接动作的溢流阀，可以和主溢流阀的遥控口连接，对主溢流阀实现远程压力调节。溢流阀的遥控口经换向阀和油箱连接时，可使油路卸荷。此时溢流阀起卸荷作用。溢流阀的遥控口串联换向阀和通经为8毫米的溢流阀时，可实现压力的多级控制。