美國PARKER比例閥優(yōu)惠美國PARKER比例閥*，也就是說，美國派克伺服閥的主閥是靠前置級閥的輸出壓力來 控制的，而前置級閥的壓力則來自于伺服閥的入口p，假如p口的壓力不足，派克前置級閥就 不能輸出足夠的壓力來推動主閥芯動作。而我們知道，當(dāng)負(fù)載為零的時(shí)候，如果四通滑閥*打開，p口壓力=t口壓力+閥口壓力損失 （忽略油路上的其它壓力損失），如果閥口壓力損失很小，t口壓力又為零，那么p口的壓力 就不足以供給前置級閥來推動主閥芯，整個(gè)伺服閥就失效了。所以派克伺服閥的閥口做得偏 小，即使在閥口全開的情況下，也要有一定的壓力損失，來維持前置級閥的正常工作。美國PARKER比例閥優(yōu)惠美國PARKER比較閥*，一般說來，好像伺服系統(tǒng)都是閉環(huán)控制，比例多用于開環(huán)控制 ；其次比例閥類型要多，有比例壓力、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)！美國PARKER比例閥優(yōu)惠派克比例閥、派克伺服閥D41FTE01FC4NF08 D41FHA31C2NB00 D41FWE01FC2NLW8 D41VW02C4NJP7 D31FHE02C4NB00 D41VW15C5NGW D41FHA31C1NB00 D41VW1C2NUW89 D41FWE02FC2NLW0 D41VW26H2NJP D41VW1C4NYP7 D41VW4C1NUW D41VW20H4NJP D41VW9E2NGW D41VW1C4NYW D41VW3P4NJPD41FHA31F2NB08 D31FTE01CC1NF08 D41FHE02C4NB00 D41FHE52C4VB00 D41FTE01FC4NG00 D41FHA31C4VB00 D41FWE02FC4NLW0 D41VW06C1NJP789 D31FHE52A1NB00 D41VW16C1NTP770 D41FHA61B4NB00 D41VW1C2NYP70 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中級會員
第16年
