美国派克PARKER比例阀上海办事处

PARKER比例阀一般采用两端承压面积不等的差径活塞结构。比例阀不工作时，差径活塞2在弹簧3的作用下处于上极限位置，此时阀门1保持开启，因而在输入控制压力P1与输出压力P2从零同步增长的初始阶段，总是P1等于P2。但是压力P1的作用面积A1为π（D2-d2）/4，压力P2的作用面积A2为πD2/4，因而A2大于A1，故活塞上方液压作用力大于活塞下方液压作用力。在P1、P2同步增长过程中，当活塞上、下两端液压作用之差超过弹簧3的预紧力时，活塞便开始下移。当P1和P2增长到一定值PS时活塞2内腔中的阀座与阀门1接触，进油腔与出油腔即为隔绝，使比例阀进入平衡状态。若进一步提高P1则活塞将回升，阀门再度开启，油液继续流入出油腔而使P2不断升高，但由于A2大于A1，P2尚未增长到新的P1值，活塞又下降到平衡位置。在任一平衡状态下，差径活塞的力的平衡方程为：P2路A2=P1路A1+F（此处F为平衡状态下的弹簧力）。

Parker派克直动式比例换向阀D*FW/D*FT系列
公称尺寸为CETOP3和CETOP5的直动式(D*FW)换向阀系列是一种用于流量控制的比例阀。该阀(D*FW)采用PWD-400/PCD-400功率放大器进行电控或将集成的电子元件插装在阀上组成一体(D*FT)。典型的应用是：通过调节斜坡信号可使阀芯柔和换向，以此来减小液压冲击和机械冲击，通过电气方式调节流量/速度可实现机械功能自动化。
Parker派克直动式比例换向阀D*FL系列
公称尺寸为CETOP3和CETOP5的D*FL系列的阀是一种用于流量控制的数字式比例阀。这种用微处理器控制的4-通阀可以通过配电信号来调出不同的给定速度。在阀上可以对加速度、减速度和速度进行调节。典型的快速/低速行程特性可以不用其它的模块就可实现。
Parker派克直动式比例换向阀WL*NG10系列
公称尺寸为CETOP5的WLL系列直动式比例阀被用于控制流量。该阀(D*FW)采用欧卡规格的VDR350/355数字式功率放大器或采用PWD-400/PCD400功率放大器模块进行电控。典型的应用是：流量控制和可实现流量调节，快速/低速行程特性控制和液压传动装置的定位。
Parker派克先导式比例换向阀D*1FS系列
公称尺寸为CETOP3至CE*0的D*1FS系列先导式比例换向阀被用于控制流量。该阀采用EW系列模拟式功率放大器进行电控或采用VRD350/355数字式功率放大器。主阀芯的位置可调。典型的应用是：流量控制和可实现流量调节，在快速/低速特性下的工作运行和柔和加速度以及延迟工作特性的改善

美国派克PARKER比例阀上海办事处

ARKER比例阀总成，包括阀体、扁担、杠杆和感载拉簧，所述阀体上设有两制动腔，制动腔内设有制动组件，阀体上装有杠杆，在杠杆上装有扁担，感载拉簧连接在杠杆上，还包括锥形弹簧，所述锥形弹簧的一端连接在杠杆上，另一端与阀体固定。本实用新型采用双弹簧结构使感载比例阀具有较高预设折点，一旦感载拉簧太疲劳造成断裂，制动力也会急剧提升，实现行车制动，消除了安全隐患。采用扁担加调节螺钉结构，通过微调使扁担与杠杆的间隙尽可能小，以保证当一腔失效时另一腔制动力不低于原制动力，消除了安全隐患。采用双腔结构，当一腔失效时还能保证一个前轮和一个后轮具有制动实行制动，消除了磕头和跑偏等安全隐患。
PARKER比例阀利用车身与车桥之间的距离变化（外界作用力）来改变弹簧的预紧力，随着车辆载荷的增加，相应地进行调整，使得在任何载荷条件下都能得到一个近似理想的制动力分配。它安装在制动总泵与后轮制动分泵之间的管道上，由壳体、柱塞、阀门、弹簧等组成。壳体进油孔与制动总泵出油孔相通，出油孔与车轮制动分泵相通。当外界作用力小时，感载比例阀的柱塞在弹簧预紧力的作用下被推至zui右边，两孔相通，总泵与分泵压力相等。当外界作用力大于弹簧预紧力，迫使柱塞左移，令柱塞与阀门接触并关闭了阀门，切断总泵通向分泵的通道；若外界作用力压力继续增大，又会使柱塞右移，柱塞与阀门脱离接触，阀门又被打开，总泵与分泵又相通。这样比例阀反复动作使分泵的液压不断得到调整，也即不断调整了后轮制动力。
PARKER比例阀具有应用灵活、节省管路和成本低廉等特点，近年来工程机械上应用越来越广泛。常用螺旋插装式比例阀有二通、三通、四通和多通等形式，二通式比例阀主比例节流阀，它常它元件一起构成复合阀，对流量、压力进行控制；三通式比例阀主比例减压阀，也是移动式机械液压系统中应用较多比例阀，它主对液动操作多路阀先导油路进行操作。利用三通式比例减压阀可以代替传统手动减压式先导阀，它比手动先导阀具有更多灵活性和更高控制精度。可以制成如图1所示比例伺服控制手动多路阀，不同输入信号，减压阀使输出活塞具有不同压力或流量进而实现对多路阀阀芯位移进行比例控制。四通或多通螺旋插装式比例阀可以对工作装置实现单独控制。

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