Parker派克DSDU系列先導式溢流閥 PARKER派克先導式壓力閥 Parker派克DSDU系列先導式溢流閥通過壓力口的開啟使油液流回油箱來限定系統壓力。該結構系列的閥有平穩的流量-壓力特性曲線，用于蓄能器系統安全。該類閥經過TUV（*監控協會）校準并頒發證書。相應的TUV證書隨閥一同供貨。（見備注）
PARKER派克先導式壓力閥	Parker派克VBY*A/VMY*A系列先導式壓力閥 Parker派克VBY*A/VMY*A系列先導式壓力閥是一種公稱尺寸為06的先導式壓力閥，可用于無級地調節壓力。對于不同的功能例如：壓下力，背壓或夾緊力，它可以使預先給定的壓力保持不變。其結構為：先導式壓力閥由先導級和主級組成。通過調節螺栓來調節作用在經過硬化處理的閥座和閥錐上的預壓縮彈簧。預壓縮彈簧在閥錐上的作用力使得在閥座和經過硬化處理的主級滑動閥芯之間產生一個控制壓力，它使受彈簧作用的閥芯保持在調節位置上，調節位置與預先給定的壓力相對應。
	Parker派克DWL/DWK系列減壓閥 Parker派克DWL/DWK系列減壓閥可以使二次端（油口A）的壓力按設定值保持不變。為達到加速響應，它裝有滑動閥芯，閥芯中的流量控制閥使控制油流保持不變。
Parker派克先導式壓力閥	Parker派克DSA-P07系列比例溢流閥 Parker派克DSA-P07系列比例溢流閥采用外部的電子模塊進行控制。借此可以無級地選擇溢流功能所需的響應的壓力值。針對各自的壓力等級在先導閥中裝有相應的調節噴嘴。直動式閥NG06也可以被用作DSA系列的先導閥。

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