PHS520S-8-240V-DL-LParker派克方向控制阀%徐州PARKER柱塞泵

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Parker派克方向控制阀%徐州PARKER柱塞泵

Parker派克方向控制阀活塞杆端部的拉钩间有一空行程s1，实现空程快速趋近，然后再带动液压缸活塞，通过节流阻尼，实现慢进。返程时也是先走空行程s1，再与液压活塞一起运动，通过单向阀，实现快退。
表42.2-3气-液阻尼缸调速特性及应用 调速方式 结构示意图 特性曲线 作用原理 应用
双向节流调速在气-液阻尼缸的回油管路装设可调式节流阀，使活塞往复运动的速度可调并相同适用于空行程及工作行程都较短的场合（s＜20mm）
单向节流调速将一单向阀和一节流阀并联在调速油路中。活塞向右运动时，单向阀关闭，节流慢进；活塞向左运动时，单向阀打开，不经节流快退。适用于空行程较短而工作行程较长的场合
快速趋近单
向节流调速将液压缸的?点与α点用管路相通，活塞开始向右运动时，右腔油经由fgea回路直接流入α端实现快速趋近，当活塞移过?点，油只能经节流阀流入α端，实现慢进，活塞向左运动时，单向阀打开，实现快退。由于快速趋近，节省了空程时间，提高了劳动生产率Parker派克方向控制阀与直接作用自力式控制阀类似，其设定信号由指挥器的设定弹簧设置。

Parker派克方向控制阀%徐州PARKER柱塞泵

Parker派克方向控制阀阀的主阀一般来说和换向阀一样是滑阀结构，只不过阀芯的换向不是靠电磁
铁来推动，而是靠前置级阀输出的液压力来推动，这一点和电液换向阀比较相似，只 不过电液换向阀的前置级阀是电磁换向阀，而伺服阀的前置级阀是动态特性比较好的
喷嘴挡板阀或射流管阀。 也就是说，伺服阀的主阀是靠前置级阀的输出压力来控制的，而前置级阀的压力 则来自于伺服阀的入口 p，假如 p
口的压力不足，前置级阀就不能输出足够的压力来 推动主阀芯动作。Parker派克方向控制阀而我们知道，当负载为零的时候，如果四通滑阀*打开，p 口压力＝t
口压力 ＋阀口压力损失（忽略油路上的其它压力损失），如果阀口压力损失很小，t 口压力 又为零， 那么 p 口的压力就不足以供给前置级阀来推动主阀芯，
整个伺服阀就失效了。 所以伺服阀的阀口做得偏小，即使在阀口全开的情况下，也要有一定的压力损失，来 维持前置级阀的正常工作。
伺服阀其实缺点极多：能耗浪费大、容易出故障、抗污染能力差、价格昂贵等等 等等，好处只有一个：动态性能是所有液压阀中zui高的。就凭着这一个优点，在很多
对动态特性要求高的场合不得不使用伺服阀，如飞机火箭的舵机控制、汽轮机调速等 等。

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