模(mo)壓(ya)異(yi)徑(jing)(jing)管(guan)--模(mo)壓(ya)異(yi)徑(jing)(jing)管(guan)若(ruo)(ruo)選擇的口徑(jing)(jing)規(gui)格(ge)與工藝(yi)管(guan)道的內徑(jing)(jing)不符，應進行(xing)相應的縮徑(jing)(jing)或擴徑(jing)(jing)處理，若(ruo)(ruo)對管(guan)道進行(xing)縮管(guan)，應考慮這樣所(suo)引起的壓(ya)力損失(shi)是(shi)否會影響工藝(yi)流程。為(wei)了防止(zhi)安裝異(yi)

模壓(ya)異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)--模壓(ya)異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)若(ruo)選擇的(de)(de)口徑(jing)(jing)(jing)規格與工藝管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)的(de)(de)內徑(jing)(jing)(jing)不符，應(ying)進(jin)行相(xiang)應(ying)的(de)(de)縮徑(jing)(jing)(jing)或擴(kuo)徑(jing)(jing)(jing)處(chu)理，若(ruo)對管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)進(jin)行縮管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，應(ying)考慮這樣所引起的(de)(de)壓(ya)力損失是否會影響工藝流(liu)(liu)程(cheng)。為了防止安裝異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)后影響流(liu)(liu)速場(chang)的(de)(de)分布，造成壓(ya)力的(de)(de)損失，進(jin)而(er)降低電(dian)磁流(liu)(liu)量計的(de)(de)測(ce)量精度，模壓(ya)異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)要(yao)求的(de)(de)中(zhong)心錐(zhui)角α不大(da)于15°，越小(xiao)越好(hao)。異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)特點：1、當管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)中(zhong)流(liu)(liu)體的(de)(de)流(liu)(liu)量有(you)變化時(shi)，比(bi)如(ru)增大(da)或減少，流(liu)(liu)速要(yao)求變化不大(da)時(shi)，模壓(ya)異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)均需(xu)采用(yong)異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。2、泵的(de)(de)進(jin)口，為防止汽(qi)蝕。3、模壓(ya)異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)與儀(yi)表，如(ru)流(liu)(liu)量計、調節閥(fa)的(de)(de)接頭處(chu)，為了與儀(yi)表的(de)(de)接頭配合，也需(xu)采用(yong)異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。有(you)分為同心和偏(pian)(pian)心兩種，同心異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)一般用(yong)在(zai)垂直管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)上(shang)；偏(pian)(pian)心異(yi)(yi)(yi)(yi)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)用(yong)于水平(ping)(ping)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)，并且要(yao)注意標明頂平(ping)(ping)還是底平(ping)(ping)。