稅控(kong)燃油(you)(you)加(jia)油(you)(you)機(ji)的(de)核(he)心部(bu)件(jian)是液(ye)壓(ya)泵(beng)(beng)，泵(beng)(beng)進(jin)口(kou)真空壓(ya)力對泵(beng)(beng)的(de)性(xing)(xing)能(neng)影(ying)(ying)響(xiang)很大，從而(er)影(ying)(ying)響(xiang)到自吸泵(beng)(beng)加(jia)油(you)(you)機(ji)的(de)整機(ji)性(xing)(xing)能(neng)。在一定工況(kuang)范(fan)圍內，泵(beng)(beng)進(jin)口(kou)處壓(ya)力對泵(beng)(beng)出口(kou)稅控(kong)燃油(you)(you)加(jia)油(you)(you)機(ji)的(de)核(he)心部(bu)件(jian)是液(ye)壓(ya)泵(beng)(beng)，泵(beng)(beng)進(jin)口(kou)真空壓(ya)力對泵(beng)(beng)的(de)性(xing)(xing)能(neng)影(ying)(ying)響(xiang)很大，從而(er)影(ying)(ying)響(xiang)到自吸泵(beng)(beng)加(jia)油(you)(you)機(ji)的(de)整機(ji)性(xing)(xing)能(neng)。

在一定(ding)工況范(fan)圍內，泵進口(kou)處(chu)壓力對泵出口(kou)處(chu)壓力影響很(hen)大。圖1表明(ming)：真空壓力增大，泵的出口(kou)壓力急劇減(jian)小(xiao)。

加油(you)(you)機油(you)(you)泵工(gong)作時(shi)(shi)，它(ta)的(de)進口具(ju)有一定真(zhen)空(kong)壓(ya)(ya)力(li)才能(neng)吸油(you)(you)，但真(zhen)空(kong)壓(ya)(ya)力(li)不能(neng)太高。否則就會產生嚴重“氣(qi)(qi)穴”現(xian)象(xiang)(xiang)，影(ying)響油(you)(you)泵的(de)吸油(you)(you)能(neng)力(li)。在油(you)(you)液壓(ya)(ya)力(li)比飽和(he)蒸(zheng)汽(qi)壓(ya)(ya)高很多時(shi)(shi)，由于溶(rong)入(ru)油(you)(you)液的(de)空(kong)氣(qi)(qi)析出，就有氣(qi)(qi)泡(pao)(pao)發生；當壓(ya)(ya)力(li)下降(jiang)到(dao)相應的(de)飽和(he)蒸(zheng)汽(qi)壓(ya)(ya)以下時(shi)(shi)，油(you)(you)液將產生大(da)量氣(qi)(qi)泡(pao)(pao)。當液壓(ya)(ya)系統(tong)中壓(ya)(ya)力(li)下降(jiang)到(dao)空(kong)氣(qi)(qi)分離壓(ya)(ya)時(shi)(shi)，就容易產生“氣(qi)(qi)穴”現(xian)象(xiang)(xiang)。“氣(qi)(qi)穴”現(xian)象(xiang)(xiang)對加油(you)(you)機的(de)吸油(you)(you)能(neng)力(li)影(ying)響最大(da)。

值(zhi)得注意的(de)是：“氣(qi)穴”現(xian)象不(bu)僅影響(xiang)加(jia)(jia)(jia)油(you)機(ji)的(de)吸油(you)能力還會(hui)(hui)對(dui)計量(liang)準確度(du)產(chan)生(sheng)影響(xiang)。當(dang)加(jia)(jia)(jia)油(you)機(ji)液(ye)壓系統(tong)(tong)流(liu)(liu)(liu)速(su)(su)(su)較大(da)(da)時，油(you)泵進(jin)口的(de)流(liu)(liu)(liu)速(su)(su)(su)也較大(da)(da)，使油(you)泵進(jin)口真(zhen)空壓力較高(gao)(gao)。當(dang)油(you)溫較高(gao)(gao)時，就會(hui)(hui)產(chan)生(sheng)大(da)(da)量(liang)氣(qi)體(ti)(ti)，使液(ye)體(ti)(ti)流(liu)(liu)(liu)動(dong)(dong)的(de)阻(zu)力增大(da)(da)，液(ye)體(ti)(ti)流(liu)(liu)(liu)速(su)(su)(su)下降(jiang)。液(ye)體(ti)(ti)流(liu)(liu)(liu)速(su)(su)(su)下降(jiang)使靜壓升高(gao)(gao)，產(chan)生(sheng)的(de)氣(qi)體(ti)(ti)減(jian)少，液(ye)體(ti)(ti)流(liu)(liu)(liu)動(dong)(dong)阻(zu)力減(jian)小，流(liu)(liu)(liu)速(su)(su)(su)增加(jia)(jia)(jia)。如此周而(er)復(fu)始，使加(jia)(jia)(jia)油(you)機(ji)液(ye)壓系統(tong)(tong)產(chan)生(sheng)流(liu)(liu)(liu)量(liang)脈動(dong)(dong)，造成流(liu)(liu)(liu)量(liang)計進(jin)出口平均壓差增加(jia)(jia)(jia)，內滲漏增加(jia)(jia)(jia)，影響(xiang)加(jia)(jia)(jia)油(you)機(ji)的(de)計量(liang)準確度(du)。“氣(qi)穴”現(xian)象和(he)液(ye)壓系統(tong)(tong)的(de)流(liu)(liu)(liu)量(liang)脈動(dong)(dong)還會(hui)(hui)增加(jia)(jia)(jia)加(jia)(jia)(jia)油(you)機(ji)的(de)噪聲(sheng)，污染環境(jing)。

圖片

油泵的進口真空壓力由四部分組成：

1．把(ba)油(you)液提升到(dao)一定高度所需(xu)壓力；

2．產生(sheng)一定流速所需的(de)壓(ya)力；

3．克服油管內壁阻力所需(xu)壓力；

4．油站當地(di)大氣壓和油罐(guan)中(zhong)液面深(shen)度(du)決定(ding)的底(di)閥進(jin)口壓力。

可將(jiang)上(shang)述(shu)4個因素統稱為泵進口管道條件，是決(jue)定泵入(ru)口真(zhen)空壓(ya)力的主要因素。如上(shang)所述(shu)，泵真(zhen)空壓(ya)力過(guo)高(gao)，將(jiang)使加(jia)(jia)(jia)油(you)機(ji)油(you)泵效率顯(xian)著降低，且(qie)容易導(dao)致“氣穴(xue)”現象的發生(sheng)，引起加(jia)(jia)(jia)油(you)機(ji)振動加(jia)(jia)(jia)劇(ju)和噪聲加(jia)(jia)(jia)大。泵的工作狀態不穩定，也會(hui)降低加(jia)(jia)(jia)油(you)機(ji)計量(liang)精度。

管道安裝標準主要包括以下內容：

1）只能在泵過(guo)濾器里安(an)裝(zhuang)(zhuang)單向閥(fa)，管路內其他位置不能安(an)裝(zhuang)(zhuang)單向閥(fa)。（由法(fa)國(guo)相關法(fa)律規(gui)定）

2）安裝管路必須光滑，且(qie)要根據流(liu)量(liang)確定(ding)管路直徑：

0-5m3/h：40/49mm（內徑(jing)(jing)/外徑(jing)(jing)）

5-10m3/h：50/60mm（內(nei)徑/外徑）

10-18m3/h：66/76mm（內徑(jing)/外徑(jing)）

18-26m3/h：80/90mm（內(nei)徑(jing)/外徑(jing)）

3）大氣壓力標準

0m（海平(ping)面）：PA=1015

300 m(平原和(he)山谷)：PA=980

600m（山區）：PA=940

1000m（中等山(shan)區）：PA=890

1500m（滑雪地(di)）：PA=845

2000m：PA=725

通過以(yi)下(xia)計算(suan)公(gong)式計算(suan)加油站的管路條件：

PA-（D*1.5）-(H*72)-540=PrD(NPSH：Net Positive Suction Head汽蝕余量△h)

其中（m）為加(jia)油機到(dao)油罐(guan)水平距離，高度(m)為吸(xi)程(cheng)（如為加(jia)油島，吸(xi)程(cheng)加(jia)25cm，底(di)部接頭加(jia)10cm)

根據大(da)部分油站的海拔高(gao)度，取大(da)氣壓力值PA=980，計算如下：

若PrD值(zhi)小(xiao)(xiao)于-100，即泵進口真空壓力小(xiao)(xiao)于-0.054MPa時，不能安(an)裝自吸泵加油機；

PrD值(zhi)介于-100-0，即泵進口真空壓力(li)大(da)于-0.054MPa，小于-0.044 MPa時(shi)，安(an)裝(zhuang)受限(xian)制，泵會產(chan)生(sheng)大(da)量的氣體，流(liu)量減少。在熱(re)天(tian)或者(zhe)油(you)面降(jiang)低，泵就抽不(bu)上(shang)油(you)，流(liu)量不(bu)穩定，不(bu)建(jian)議安(an)裝(zhuang)加油(you)機；

PrD值為0-100，即泵進口真空壓力大(da)于-0.044MPa，小(xiao)于-0.034 MPa時，為正常安裝條(tiao)件，在熱(re)天，要(yao)注意防止溫(wen)度的升(sheng)高；

PrD值為100-250，泵進口真空壓力大于-0.034MPa，小于-0.019 MPa時，安裝條件良(liang)好；

PrD值(zhi)大(da)(da)(da)于(yu)250，泵(beng)(beng)(beng)(beng)(beng)(beng)進(jin)口(kou)(kou)(kou)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)大(da)(da)(da)于(yu)-0.019 MPa時(shi)，為(wei)(wei)(wei)特別(bie)好(hao)的(de)(de)(de)(de)(de)安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)條件(jian)。處壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)影(ying)(ying)響(xiang)(xiang)很(hen)(hen)大(da)(da)(da)。圖1表(biao)明：真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)增(zeng)(zeng)大(da)(da)(da)，泵(beng)(beng)(beng)(beng)(beng)(beng)的(de)(de)(de)(de)(de)出(chu)(chu)口(kou)(kou)(kou)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)急劇減(jian)小。加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)泵(beng)(beng)(beng)(beng)(beng)(beng)工作時(shi)，它的(de)(de)(de)(de)(de)進(jin)口(kou)(kou)(kou)具(ju)有一定真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)才能(neng)吸油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)，但(dan)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)不(bu)能(neng)太高(gao)(gao)(gao)。否(fou)則就會(hui)(hui)(hui)產(chan)生(sheng)嚴重“氣穴(xue)(xue)”現(xian)象(xiang)(xiang)，影(ying)(ying)響(xiang)(xiang)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)泵(beng)(beng)(beng)(beng)(beng)(beng)的(de)(de)(de)(de)(de)吸油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)能(neng)力(li)(li)(li)(li)(li)。在(zai)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)比飽和(he)(he)(he)蒸(zheng)汽壓(ya)(ya)(ya)(ya)高(gao)(gao)(gao)很(hen)(hen)多時(shi)，由于(yu)溶入(ru)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)液(ye)(ye)(ye)的(de)(de)(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)氣析出(chu)(chu)，就有氣泡發生(sheng)；當壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)下(xia)降(jiang)到(dao)相應的(de)(de)(de)(de)(de)飽和(he)(he)(he)蒸(zheng)汽壓(ya)(ya)(ya)(ya)以下(xia)時(shi)，油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)液(ye)(ye)(ye)將產(chan)生(sheng)大(da)(da)(da)量(liang)氣泡。當液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)系統(tong)(tong)(tong)中壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)下(xia)降(jiang)到(dao)空(kong)(kong)(kong)(kong)(kong)氣分(fen)離壓(ya)(ya)(ya)(ya)時(shi)，就容易(yi)(yi)產(chan)生(sheng)“氣穴(xue)(xue)”現(xian)象(xiang)(xiang)。“氣穴(xue)(xue)”現(xian)象(xiang)(xiang)對加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)的(de)(de)(de)(de)(de)吸油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)能(neng)力(li)(li)(li)(li)(li)影(ying)(ying)響(xiang)(xiang)最大(da)(da)(da)。值(zhi)得注(zhu)意的(de)(de)(de)(de)(de)是：“氣穴(xue)(xue)”現(xian)象(xiang)(xiang)不(bu)僅影(ying)(ying)響(xiang)(xiang)加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)的(de)(de)(de)(de)(de)吸油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)能(neng)力(li)(li)(li)(li)(li)還會(hui)(hui)(hui)對計量(liang)準確(que)度(du)(du)產(chan)生(sheng)影(ying)(ying)響(xiang)(xiang)。當加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)系統(tong)(tong)(tong)流速(su)(su)較大(da)(da)(da)時(shi)，油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)泵(beng)(beng)(beng)(beng)(beng)(beng)進(jin)口(kou)(kou)(kou)的(de)(de)(de)(de)(de)流速(su)(su)也(ye)較大(da)(da)(da)，使油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)泵(beng)(beng)(beng)(beng)(beng)(beng)進(jin)口(kou)(kou)(kou)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)較高(gao)(gao)(gao)。當油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)溫(wen)較高(gao)(gao)(gao)時(shi)，就會(hui)(hui)(hui)產(chan)生(sheng)大(da)(da)(da)量(liang)氣體，使液(ye)(ye)(ye)體流動的(de)(de)(de)(de)(de)阻力(li)(li)(li)(li)(li)增(zeng)(zeng)大(da)(da)(da)，液(ye)(ye)(ye)體流速(su)(su)下(xia)降(jiang)。液(ye)(ye)(ye)體流速(su)(su)下(xia)降(jiang)使靜(jing)壓(ya)(ya)(ya)(ya)升高(gao)(gao)(gao)，產(chan)生(sheng)的(de)(de)(de)(de)(de)氣體減(jian)少(shao)，液(ye)(ye)(ye)體流動阻力(li)(li)(li)(li)(li)減(jian)小，流速(su)(su)增(zeng)(zeng)加(jia)(jia)(jia)(jia)。如此周而復始，使加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)系統(tong)(tong)(tong)產(chan)生(sheng)流量(liang)脈(mo)動，造成流量(liang)計進(jin)出(chu)(chu)口(kou)(kou)(kou)平均壓(ya)(ya)(ya)(ya)差增(zeng)(zeng)加(jia)(jia)(jia)(jia)，內(nei)滲漏增(zeng)(zeng)加(jia)(jia)(jia)(jia)，影(ying)(ying)響(xiang)(xiang)加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)的(de)(de)(de)(de)(de)計量(liang)準確(que)度(du)(du)。“氣穴(xue)(xue)”現(xian)象(xiang)(xiang)和(he)(he)(he)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)系統(tong)(tong)(tong)的(de)(de)(de)(de)(de)流量(liang)脈(mo)動還會(hui)(hui)(hui)增(zeng)(zeng)加(jia)(jia)(jia)(jia)加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)的(de)(de)(de)(de)(de)噪聲，污染環(huan)境。圖片(pian)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)泵(beng)(beng)(beng)(beng)(beng)(beng)的(de)(de)(de)(de)(de)進(jin)口(kou)(kou)(kou)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)由四(si)部(bu)分(fen)組成：1．把油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)液(ye)(ye)(ye)提升到(dao)一定高(gao)(gao)(gao)度(du)(du)所需壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)；2．產(chan)生(sheng)一定流速(su)(su)所需的(de)(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)；3．克服油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)管(guan)內(nei)壁阻力(li)(li)(li)(li)(li)所需壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)；4．油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)站(zhan)(zhan)當地(di)大(da)(da)(da)氣壓(ya)(ya)(ya)(ya)和(he)(he)(he)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)罐中液(ye)(ye)(ye)面(mian)深度(du)(du)決定的(de)(de)(de)(de)(de)底(di)閥進(jin)口(kou)(kou)(kou)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)。可(ke)將上(shang)述4個因素統(tong)(tong)(tong)稱(cheng)為(wei)(wei)(wei)泵(beng)(beng)(beng)(beng)(beng)(beng)進(jin)口(kou)(kou)(kou)管(guan)道條件(jian)，是決定泵(beng)(beng)(beng)(beng)(beng)(beng)入(ru)口(kou)(kou)(kou)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)的(de)(de)(de)(de)(de)主要因素。如上(shang)所述，泵(beng)(beng)(beng)(beng)(beng)(beng)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)過高(gao)(gao)(gao)，將使加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)泵(beng)(beng)(beng)(beng)(beng)(beng)效率(lv)顯著(zhu)降(jiang)低(di)(di)，且容易(yi)(yi)導致“氣穴(xue)(xue)”現(xian)象(xiang)(xiang)的(de)(de)(de)(de)(de)發生(sheng)，引起加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)振動加(jia)(jia)(jia)(jia)劇和(he)(he)(he)噪聲加(jia)(jia)(jia)(jia)大(da)(da)(da)。泵(beng)(beng)(beng)(beng)(beng)(beng)的(de)(de)(de)(de)(de)工作狀態不(bu)穩定，也(ye)會(hui)(hui)(hui)降(jiang)低(di)(di)加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)計量(liang)精度(du)(du)。管(guan)道安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)標(biao)準主要包括以下(xia)內(nei)容：1）只能(neng)在(zai)泵(beng)(beng)(beng)(beng)(beng)(beng)過濾器里安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)單(dan)向(xiang)(xiang)閥，管(guan)路(lu)內(nei)其(qi)他位置(zhi)不(bu)能(neng)安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)單(dan)向(xiang)(xiang)閥。（由法國相關法律(lv)規(gui)定）2）安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)管(guan)路(lu)必須光滑，且要根(gen)據(ju)流量(liang)確(que)定管(guan)路(lu)直(zhi)徑(jing)(jing)：0-5m3/h：40/49mm（內(nei)徑(jing)(jing)/外(wai)(wai)徑(jing)(jing)）5-10m3/h：50/60mm（內(nei)徑(jing)(jing)/外(wai)(wai)徑(jing)(jing)）10-18m3/h：66/76mm（內(nei)徑(jing)(jing)/外(wai)(wai)徑(jing)(jing)）18-26m3/h：80/90mm（內(nei)徑(jing)(jing)/外(wai)(wai)徑(jing)(jing)）3）大(da)(da)(da)氣壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)標(biao)準0m（海(hai)平面(mian)）：PA=1015300 m(平原(yuan)和(he)(he)(he)山谷)：PA=980600m（山區(qu)）：PA=9401000m（中等山區(qu)）：PA=8901500m（滑雪地(di)）：PA=8452000m：PA=725通過以下(xia)計算公式計算加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)站(zhan)(zhan)的(de)(de)(de)(de)(de)管(guan)路(lu)條件(jian)：PA-（D*1.5）-(H*72)-540=PrD(NPSH：Net Positive Suction Head汽蝕余量(liang)△h)其(qi)中（m）為(wei)(wei)(wei)加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)到(dao)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)罐水平距(ju)離，高(gao)(gao)(gao)度(du)(du)(m)為(wei)(wei)(wei)吸程(cheng)（如為(wei)(wei)(wei)加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)島，吸程(cheng)加(jia)(jia)(jia)(jia)25cm，底(di)部(bu)接頭加(jia)(jia)(jia)(jia)10cm)根(gen)據(ju)大(da)(da)(da)部(bu)分(fen)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)站(zhan)(zhan)的(de)(de)(de)(de)(de)海(hai)拔高(gao)(gao)(gao)度(du)(du)，取大(da)(da)(da)氣壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)值(zhi)PA=980，計算如下(xia)：若(ruo)PrD值(zhi)小于(yu)-100，即(ji)泵(beng)(beng)(beng)(beng)(beng)(beng)進(jin)口(kou)(kou)(kou)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)小于(yu)-0.054MPa時(shi)，不(bu)能(neng)安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)自吸泵(beng)(beng)(beng)(beng)(beng)(beng)加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)；PrD值(zhi)介于(yu)-100-0，即(ji)泵(beng)(beng)(beng)(beng)(beng)(beng)進(jin)口(kou)(kou)(kou)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)大(da)(da)(da)于(yu)-0.054MPa，小于(yu)-0.044 MPa時(shi)，安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)受限(xian)制，泵(beng)(beng)(beng)(beng)(beng)(beng)會(hui)(hui)(hui)產(chan)生(sheng)大(da)(da)(da)量(liang)的(de)(de)(de)(de)(de)氣體，流量(liang)減(jian)少(shao)。在(zai)熱(re)天或(huo)者油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)面(mian)降(jiang)低(di)(di)，泵(beng)(beng)(beng)(beng)(beng)(beng)就抽不(bu)上(shang)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)，流量(liang)不(bu)穩定，不(bu)建議安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)加(jia)(jia)(jia)(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)(you)機(ji)(ji)；PrD值(zhi)為(wei)(wei)(wei)0-100，即(ji)泵(beng)(beng)(beng)(beng)(beng)(beng)進(jin)口(kou)(kou)(kou)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)大(da)(da)(da)于(yu)-0.044MPa，小于(yu)-0.034 MPa時(shi)，為(wei)(wei)(wei)正常安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)條件(jian)，在(zai)熱(re)天，要注(zhu)意防止溫(wen)度(du)(du)的(de)(de)(de)(de)(de)升高(gao)(gao)(gao)；PrD值(zhi)為(wei)(wei)(wei)100-250，泵(beng)(beng)(beng)(beng)(beng)(beng)進(jin)口(kou)(kou)(kou)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)大(da)(da)(da)于(yu)-0.034MPa，小于(yu)-0.019 MPa時(shi)，安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)條件(jian)良好(hao)；PrD值(zhi)大(da)(da)(da)于(yu)250，泵(beng)(beng)(beng)(beng)(beng)(beng)進(jin)口(kou)(kou)(kou)真空(kong)(kong)(kong)(kong)(kong)壓(ya)(ya)(ya)(ya)力(li)(li)(li)(li)(li)大(da)(da)(da)于(yu)-0.019 MPa時(shi)，為(wei)(wei)(wei)特別(bie)好(hao)的(de)(de)(de)(de)(de)安(an)(an)(an)裝(zhuang)(zhuang)(zhuang)條件(jian)。