DBDS20K18/315直动式溢流阀

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DBDS20K18/315直动式溢流阀

压力控制阀

压力控制阀的作用:

1、用来控制液压系统中油液压力;

1)溢流阀：直动式溢流阀、先导式溢流阀

2)减压阀

2、以压力为控制信号实现油路通断。

3)顺序阀

4)压力继电器

共同工作原理:利用作用于阀心上的液压力与弹簧力相平衡的原理进行工作。

溢流阀应用实例

(1)为定量泵系统溢流稳压和定量泵、节流阀并联，阀口常开。

(2)变量泵系统提供过载保护

和变量泵组合，正常工作时阀口关闭，过载时打开，起安全保护作用,故又称安全阀。

(3)实现远程调压  p远程< p主调

(4)系统卸荷和多级调压 和二位二通阀组合(先导式)

(5)形成背压

减压阀用于降低并稳定系统中某一支路的油液压力，常用于夹紧、控制等油路中。

顺序阀是一种利用压力控制阀口通断的压力阀，因用于控制多个执行元件的动作顺序而得名。按控制油来源不同分内控和外控，按弹簧腔泄漏油引出方式不同分内泄和外泄。

压力继电器功用:根据系统压力变化,自动接通或断开电路,实现程序控制或安全保护。

工作原理: pk> pT时，柱塞上升,发出信号pk< pT时，柱塞下降,断开信号。

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。

DBDS20K18/315直动式溢流阀

DBD 型泄压阀是直动式座阀。它们用于限制系统压力。

阀门主要由套筒 (1)、弹簧 (2)、带阻尼活塞的提升阀 (3)（压力等级 25 bar … 400 bar）或球阀 (4)（压力等级 630 bar）和调节类型 (5) 组成。系统压力可通过调节类型 (5) 进行无级设置。弹簧 (2) 将提升阀 (3) 或球 (4) 推到阀座上。通道 P 连接到系统。系统中存在的压力作用在提升阀表面（或球体）上。如果通道 P 中的压力超过弹簧 (2) 上设置的值，则提升阀 (3) 或球 (4) 会逆着弹簧 (2) 打开。现在，液压油从通道 P 流入通道 T。提升阀 (3) 的行程受到压花 (6) 的限制。

为了在整个压力范围内实现良好的压力调节，整个压力范围分为7个压力等级。一个压力等级对应于某个弹簧，用于可通过该弹簧设置的较大工作压力。

注意事项：

调整类型 (5) 的构造使其不会丢失。由于万向节安装，在完全卸载的情况下，调整类型 (5) 中的调整元件保持松动（可移动）。

压力等级“25”：如果在完全卸载的调节类型下，较小压力仍未稳定，则由于弹簧和/或恢复力较低，调节元件必须“拉回”到止挡位置。

为了调整/增加压力，然后可以再次拧入调整元件。

类型 DBDS..K1X/…

版本压力等级 25 … 400 bar（提升座阀）

DBDS20K18/315直动式溢流阀型号

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旋启式止回阀：旋启式止回阀的阀瓣呈圆盘状，绕阀座通道的转轴作旋转运动，因阀内通道成流线型，流动阻力比升降式止回阀小，适用于低流速和流动不常变化的大口径场合，但不宜用于脉动流，其密封性能不及升降式。旋启式止回阀分单瓣式、双瓣式和多半式三种，这三种形式主要按阀门口径来分，目的是为了防止介质停止流动或倒流时，减弱水力冲击。