主閥結構選擇

卸(xie)荷閥(fa)(fa)（又(you)是安(an)全閥(fa)(fa)）的主(zhu)閥(fa)(fa)按配合形式不(bu)(bu)(bu)同(tong)(tong)(tong)(tong)可分為(wei)三(san)級(ji)(ji)(ji)(ji)、二(er)級(ji)(ji)(ji)(ji)同(tong)(tong)(tong)(tong)心(xin)和式三(san)類。其中滑閥(fa)(fa)式結(jie)(jie)構(gou)(gou)工作壓力低，控制(zhi)壓力精(jing)度不(bu)(bu)(bu)高；三(san)級(ji)(ji)(ji)(ji)同(tong)(tong)(tong)(tong)心(xin)結(jie)(jie)構(gou)(gou)雖成(cheng)熟，目前(qian)應用(yong)較(jiao)廣，但與二(er)級(ji)(ji)(ji)(ji)同(tong)(tong)(tong)(tong)心(xin)式比較(jiao)，不(bu)(bu)(bu)及二(er)級(ji)(ji)(ji)(ji)同(tong)(tong)(tong)(tong)心(xin)式動作靈敏，規(gui)格相同(tong)(tong)(tong)(tong)，行程(cheng)相同(tong)(tong)(tong)(tong)時(shi)，二(er)級(ji)(ji)(ji)(ji)同(tong)(tong)(tong)(tong)心(xin)結(jie)(jie)構(gou)(gou)的通油能(neng)力遠(yuan)大于(yu)三(san)級(ji)(ji)(ji)(ji)同(tong)(tong)(tong)(tong)心(xin)結(jie)(jie)構(gou)(gou)；二(er)級(ji)(ji)(ji)(ji)同(tong)(tong)(tong)(tong)心(xin)式控制(zhi)壓力穩定，加工工藝性(xing)好(hao)，二(er)級(ji)(ji)(ji)(ji)同(tong)(tong)(tong)(tong)心(xin)式應用(yong)前(qian)景(jing)廣闊，這里以二(er)級(ji)(ji)(ji)(ji)同(tong)(tong)(tong)(tong)心(xin)結(jie)(jie)構(gou)(gou)，討論其結(jie)(jie)構(gou)(gou)尺(chi)寸設計方(fang)法(fa)。

工程上使用(yong)多(duo)路組(zu)合換向閥，就(jiu)目前(qian)來看多(duo)為(wei)手(shou)動式(shi)，其卸荷方式(shi)多(duo)采(cai)用(yong)貫穿控制式(shi)卸荷閥卸荷，卸荷閥經(jing)常采(cai)用(yong)的結構形式(shi)，下(xia)面簡要介紹一(yi)下(xia)其設計方法(fa)。