自力式調節閥（自力式控製閥）依靠流經閥內介質自身的壓力、溫度作為能源驅動閥瓣改變閥門的開度，達到調節壓力、流量、溫度的自動工作，不需要外接電源和二次儀表。（自力式調節閥多用來控製閥後壓力。）
調節閥又名控製閥，一般由執行機構和閥門組成，是通過接受調節控製單元輸出的控製信號，借助動力操作去改變介質流量、壓力、溫度、液位等工藝參數的最終控製元件。（調節閥可以直接控製壓力和流量。）
自力式調節閥與調節閥的區別
1、調節上：調節閥比自力式閥的調節精度高
自力式調節閥的調節精度基本取決於自力式閥的彈簧和膜片精度，一般最終調節精度不會優於5%，10%youbaozheng。erputongtiaojiefa，zuizhongdetiaojiejingduqujueyubiaosongqidejingduhetiaojieqidejingdu，ertiaojieqijingduhengao，qiyingxiangyibanhulvebuji。suoyizilishifadetiaojiejingdukendingbiputongtiaojiehuiludejingduyaochabushao，zaitiaojiejingduyaoqiugaoshi，bujianyicaiyongzilishifa。
一般來說調節閥和自力式調節閥同樣用來調節壓力出來的效果是沒什麼不同的，但調節閥是儀表風、彈簧力與介質平衡，自力閥是膜盒介質壓力、彈簧與管道介質壓力平衡。如果上遊壓力變了，自力閥開度會變，流量也就跟著變了。
2、應用上：一個現場，一個遠傳，一個用介質壓力調，一個用儀表風
調節閥要是引到DCSkongzhidehua，keyifangbiandigaibiangeiding，keyirenweidekuaisuguanbihuodakai，keyiyougezhongxiangguandequshijilu。zilitiaojiefageidingjibentiaobule，erqiezhinengshixianchangzijiyunxing。zhinenghuadechengduyaodadazhekou。zilishitiaojiefatiaozhengshedingzhibijiaomafan，yinciyongzaibuxuyaojingchanggaibianshedingdechanghe，birushebeirunhuayougongyoudeng。zilishitiaojiefayaoconggongyijiezhiquya，yinciyongzaijiaoganjingdechanghe，jiezhiyoufushi、顆粒等就不適用了。
3、安裝與設計上
zilishitiaojiefayoufaqianquyakongzhihefahouquyakongzhi。shejishi，yingweiquyadiandeanzhuangliuhaojianju。anzhuangshi，zhengqiguanxianshangdezilishitiaojiefazhixingjiegouyingxiangxiaanzhuang，quyadiancongzhuguandibujierulengningqi，lengningqiyinggaoyuzhixingjigoudiyuzhengqizhuguan，bimianzhengqiguoresunhaifati。chucizhiwai，yingzhixingjigouxiangshanganzhuang，youyuzilishitiaojiefachangyongyuqitiguan，zecishiquyadianyingcongzhuguandingbukaikou。
