Parker派克TDA系列比例節(jié)流閥
Parker派克TDA系列比例節(jié)流閥是由三級組成。閥錐由座閥結(jié)構(gòu)的伺服閥芯進行先導控制。帶力反饋的比例電磁閥調(diào)節(jié)伺服閥芯的位置。因此閥錐的位置不會受到壓差的影響。壓差可以達到最大的工作壓力。先導控制的控制油流量大約為1 l/min。工作的最低壓力為3 bar。控制壓力必須大于A口處系統(tǒng)壓力的25％。流量的調(diào)節(jié)精度為0.5％。由于流量特性曲線是漸進的，因此當小流量時，該調(diào)節(jié)精度在漸進區(qū)域內(nèi)被改善為0.25％。整個行程的調(diào)節(jié)時間大約為25ms。當油液由B向A流動時，在關閉的初始位置上由B向A不能有泄漏。在該初始位置上先導控制不需要控制油。回油口T的壓力不能高于100 bar。
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