一般說(shuō)來(lái),好像伺服系統(tǒng)都是閉環(huán)控制,力士樂(lè)比例閥多用于開(kāi)環(huán)控制;其次力士樂(lè)比例閥類(lèi)型要多,有力士樂(lè)比例壓力、力士樂(lè)流量控制閥等,控制比伺服要靈活一些。從他們內(nèi)部結(jié)構(gòu)看,伺服閥多是零遮蓋,比例閥則有一定的死區(qū),控制精度要低,響應(yīng)要慢。但從發(fā)展趨勢(shì)看,特別在比例方向流量控制閥和伺服閥方面,兩者性能差別逐漸在縮小,另外比例閥的成本比伺服閥要低許多,抗污染能力也強(qiáng)!
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