Parker派克DSDU系列先导式溢流阀 PARKER派克先导式压力阀 Parker派克DSDU系列先导式溢流阀通过压力口的开启使油液流回油箱来限定系统压力。该结构系列的阀有平稳的流量-压力特性曲线，用于蓄能器系统安全。该类阀经过TUV（*监控协会）校准并颁发证书。相应的TUV证书随阀一同供货。（见备注）
PARKER派克先导式压力阀	Parker派克VBY*A/VMY*A系列先导式压力阀 Parker派克VBY*A/VMY*A系列先导式压力阀是一种公称尺寸为06的先导式压力阀，可用于无级地调节压力。对于不同的功能例如：压下力，背压或夹紧力，它可以使预先给定的压力保持不变。其结构为：先导式压力阀由先导级和主级组成。通过调节螺栓来调节作用在经过硬化处理的阀座和阀锥上的预压缩弹簧。预压缩弹簧在阀锥上的作用力使得在阀座和经过硬化处理的主级滑动阀芯之间产生一个控制压力，它使受弹簧作用的阀芯保持在调节位置上，调节位置与预先给定的压力相对应。
	Parker派克DWL/DWK系列减压阀 Parker派克DWL/DWK系列减压阀可以使二次端（油口A）的压力按设定值保持不变。为达到加速响应，它装有滑动阀芯，阀芯中的流量控制阀使控制油流保持不变。
Parker派克先导式压力阀	Parker派克DSA-P07系列比例溢流阀 Parker派克DSA-P07系列比例溢流阀采用外部的电子模块进行控制。借此可以无级地选择溢流功能所需的响应的压力值。针对各自的压力等级在先导阀中装有相应的调节喷嘴。直动式阀NG06也可以被用作DSA系列的先导阀。

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