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DB10-1-52/200溢流阀现货 德国博世力士乐REXROTH溢流阀 电磁溢流阀 比例溢流阀 原装供应

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DB10-1-52/200溢流阀现货

性能

(1)调压范围：它是指减压阀输出压力P2的可调范围，在此范围内要求达到规定的精度。调压范围主要与调压弹簧的刚度有关。

(2)压力特性：它是指流量g为定值时，因输入压力波动而引起输出压力波动的特性。输出压力波动越小，减压阀的特性越好。输出压力必须低于输入压力—定值才基本上不随输入压力变化而变化。

(3)流量特性：它是指输入压力—定时，输出压力随输出流量g的变化而变化的持性。当流量g发生变化时，输出压力的变化越小越好。一般输出压力越低，它随输出流量的变化波动就越小

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。更换溢流阀的调节弹簧，可改变其压力调节范围。手轮顺时针转动时，压力升高。反之压力降低。

溢流阀遥控口接法

先导阀前腔有一遥控口，在该控制口接远程调压阀可实现远控，接电磁阀通回油箱可实现卸载。

远程调压阀实际上是一个单独的压力先导阀，旁接在先导型溢流阀遥控口起远程调压作用，其调定压力必须低于先导阀的调定压力。无论哪个起作用，泵的溢流量始终经主阀阀口回油箱。

溢流阀一般有两种结构：1、直动型溢流阀 。2、先导式溢流阀。

对溢流阀的主要要求：调压范围大，调压偏差小，压力振摆小，动作灵敏，过载能力大，噪声小。

先导型溢流阀的导阀部分结构尺寸较小，调压弹簧不必很强，因此压力调整比较轻便。但因先导型溢流阀要在先导阀和主阀都动作后才能起控制作用，因此反应不如直动型溢流阀灵敏。

与三节同心结构相比，二节同心结构的特点是：①主阀芯仅与阀套和主阀座有同心度要求，免去了与阀盖的配合，故结构简单，加工和装配方便。②过流面积大，在相同流量的情况下，主阀开启高度小；或者在相同开启高度的情况下，其通流能力大，因此，可做得体积小、重量轻。③主阀芯与阀套可以通用化，便于批量生产。

DB10-1-52/200溢流阀

DB 型阀门属于先导式限制阀。其用于限制工作压力，主要由带主阀心 (3) 的主阀 (1) 以及先导控制阀 (2) 和封闭板 (16) 组成。

通道 P 中的压力作用于主阀芯 (3)。

同时，该压力通过配有喷嘴 (4) 和 (5) 的控制油路 (6) 和 (7) 施加于主阀芯 (3) 的弹簧负载侧和先导控制阀 (2) 中的滚珠 (8)。如果通道 P 中的压力由于弹簧 (9) 上设定的值而增加，则滚珠 (8) 将背向弹簧 (9) 打开。此动作的信号通过控制线路 (10) 和 (6) 在内部从通道 P 发送。此时主阀芯 (3) 弹簧负载侧的液压油通过控制油路 (7)、喷嘴孔 (11) 和滚珠 (8) 在弹簧腔 (12) 内流动。从此处，液压油通过控制油路 (13) 从内部传递到容器（对于型号 DB...–...），或通过控制油路 (14) 从外部流入油箱（对于型号 DB...Y...）。由于存在喷嘴 (4) 和 (5)，在主阀芯 (3) 处有压降。通道 P 到 T 可自由连接。现在，液压油从通道 P 流到通道 T，同时维持设定的工作压力。

溢流阀可通过油口“X”(15) 卸载或切换为另一压力（第二个压力等级）。

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阀门在串联使用时，随着开度变化，,阀前后压差也有变化，因此使阀门的工作特性曲线偏离理想特性。如果管路阻力大，直线性会变成快开特性，而丧失调节能力。等百分比特性将变成直线特性。小流量情况下，由于很少有管路阻力，上述特性畸变就不大了，对等百分比特性，实际上也就没有必要。从制造的角度来说， Cv =0.05以下时，也不可能再产生等百分比的侧面形状。因此，对小流量阀主要的问题是如何将流量控制在所需要的范围之内。