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 PARKER比(bi)(bi)(bi)例閥(fa)(fa)具有(you)(you)應(ying)(ying)用(yong)靈(ling)(ling)活(huo)、節(jie)省管路和成(cheng)本低廉等特點，近年來(lai)工程機(ji)械(xie)上應(ying)(ying)用(yong)越來(lai)越廣泛。常用(yong)螺旋(xuan)插裝式(shi)比(bi)(bi)(bi)例閥(fa)(fa)有(you)(you)二(er)通(tong)、三(san)(san)通(tong)、四通(tong)和多(duo)通(tong)等形式(shi)，二(er)通(tong)式(shi)比(bi)(bi)(bi)例閥(fa)(fa)主比(bi)(bi)(bi)例節(jie)流(liu)(liu)閥(fa)(fa)，它(ta)常它(ta)元(yuan)件一起構成(cheng)復合閥(fa)(fa)，對流(liu)(liu)量(liang)、壓(ya)(ya)(ya)力進行(xing)(xing)控(kong)(kong)制(zhi)；三(san)(san)通(tong)式(shi)比(bi)(bi)(bi)例閥(fa)(fa)主比(bi)(bi)(bi)例減(jian)(jian)壓(ya)(ya)(ya)閥(fa)(fa)，也是移動(dong)(dong)式(shi)機(ji)械(xie)液壓(ya)(ya)(ya)系統(tong)中應(ying)(ying)用(yong)較多(duo)比(bi)(bi)(bi)例閥(fa)(fa)，它(ta)主對液動(dong)(dong)操作多(duo)路閥(fa)(fa)先(xian)導(dao)油路進行(xing)(xing)操作。利(li)用(yong)三(san)(san)通(tong)式(shi)比(bi)(bi)(bi)例減(jian)(jian)壓(ya)(ya)(ya)閥(fa)(fa)可(ke)以代(dai)替傳統(tong)手動(dong)(dong)減(jian)(jian)壓(ya)(ya)(ya)式(shi)先(xian)導(dao)閥(fa)(fa)，它(ta)比(bi)(bi)(bi)手動(dong)(dong)先(xian)導(dao)閥(fa)(fa)具有(you)(you)更多(duo)靈(ling)(ling)活(huo)性和更高控(kong)(kong)制(zhi)精(jing)度。可(ke)以制(zhi)成(cheng)如圖1所示比(bi)(bi)(bi)例伺服控(kong)(kong)制(zhi)手動(dong)(dong)多(duo)路閥(fa)(fa)，不同輸入(ru)信號，減(jian)(jian)壓(ya)(ya)(ya)閥(fa)(fa)使(shi)輸出活(huo)塞具有(you)(you)不同壓(ya)(ya)(ya)力或流(liu)(liu)量(liang)進而實(shi)現對多(duo)路閥(fa)(fa)閥(fa)(fa)芯位移進行(xing)(xing)比(bi)(bi)(bi)例控(kong)(kong)制(zhi)。四通(tong)或多(duo)通(tong)螺旋(xuan)插裝式(shi)比(bi)(bi)(bi)例閥(fa)(fa)可(ke)以對工作裝置(zhi)實(shi)現單獨控(kong)(kong)制(zhi)。

PVP3330R2A20 PISTON PUMP 33CC/REV
PV032R1K1A1NPF1 PISTON PUMP 32CC/REV
PVP1630R2C10 PISTON PUMP 16cc / REV
PV023R1S1T1NPRC PISTON PUMP 23cc/REV
PVP1636R2 PISTON PUMP 16CC/REV
PVP1636R2M12 PISTON PUMP 16CC/REV
PVP1636R2A12 PISTON PUMP 16CC/REV
PVP2336L2 PISTON PUMP 23CC/REV
PVP2336R2 PISTON PUMP 23CC/REV
PVP3336R2 PISTON PUMP 33CC/REV REAR PORT
PVP3336R2M20 PISTON PUMP 33CC/REV
PVP3336R2A20 PISTON PUMP 33CC/REV

 減(jian)(jian)壓(ya)(ya)閥(fa)(fa)(fa)出廠時(shi)(shi)，調(diao)(diao)(diao)節彈(dan)(dan)簧(huang)處于未壓(ya)(ya)縮狀(zhuang)態,此(ci)時(shi)(shi)主(zhu)(zhu)閥(fa)(fa)(fa)瓣(ban)和副閥(fa)(fa)(fa)瓣(ban)處于關閉(bi)狀(zhuang)態,使用(yong)時(shi)(shi)按(an)順時(shi)(shi)針(zhen)轉動(dong)(dong)調(diao)(diao)(diao)節螺(luo)釘,壓(ya)(ya)縮調(diao)(diao)(diao)節彈(dan)(dan)簧(huang),使膜瓣(ban)移頂(ding)開付閥(fa)(fa)(fa)瓣(ban),介(jie)(jie)質(zhi)由a孔通過付閥(fa)(fa)(fa)座到b孔進(jin)入(ru)活塞上(shang)方(fang),活塞在(zai)介(jie)(jie)質(zhi)壓(ya)(ya)力的(de)作用(yong)下(xia)(xia),向下(xia)(xia)移動(dong)(dong)推動(dong)(dong)主(zhu)(zhu)閥(fa)(fa)(fa)瓣(ban)離(li)開主(zhu)(zhu)閥(fa)(fa)(fa)座,使介(jie)(jie)質(zhi)流(liu)向閥(fa)(fa)(fa)后.同時(shi)(shi)由c孔進(jin)入(ru)膜片(pian)下(xia)(xia)方(fang),當閥(fa)(fa)(fa)后壓(ya)(ya)力超過調(diao)(diao)(diao)定(ding)壓(ya)(ya)力時(shi)(shi),推動(dong)(dong)膜片(pian)上(shang)移壓(ya)(ya)縮調(diao)(diao)(diao)節彈(dan)(dan)簧(huang),付閥(fa)(fa)(fa)瓣(ban)隨(sui)之(zhi)(zhi)向關閉(bi)方(fang)向移動(dong)(dong),使流(liu)入(ru)活塞上(shang)方(fang)的(de)介(jie)(jie)質(zhi)減(jian)(jian)小,壓(ya)(ya)力也隨(sui)之(zhi)(zhi)下(xia)(xia)降,此(ci)時(shi)(shi)的(de)主(zhu)(zhu)閥(fa)(fa)(fa)瓣(ban)在(zai)主(zhu)(zhu)閥(fa)(fa)(fa)瓣(ban)彈(dan)(dan)簧(huang)力的(de)推動(dong)(dong)上(shang)下(xia)(xia)移,使主(zhu)(zhu)閥(fa)(fa)(fa)瓣(ban)與主(zhu)(zhu)閥(fa)(fa)(fa)座的(de)間(jian)隙減(jian)(jian)小,介(jie)(jie)質(zhi)流(liu)量也隨(sui)之(zhi)(zhi)減(jian)(jian)小,使閥(fa)(fa)(fa)后壓(ya)(ya)力也隨(sui)之(zhi)(zhi)下(xia)(xia)降到新的(de)平衡,反之(zhi)(zhi)當閥(fa)(fa)(fa)后壓(ya)(ya)力低(di)于調(diao)(diao)(diao)定(ding)壓(ya)(ya)力時(shi)(shi),主(zhu)(zhu)閥(fa)(fa)(fa)瓣(ban)與主(zhu)(zhu)閥(fa)(fa)(fa)座的(de)間(jian)隙增大(da),介(jie)(jie)質(zhi)流(liu)量也隨(sui)之(zhi)(zhi)增加,使閥(fa)(fa)(fa)后壓(ya)(ya)力也隨(sui)之(zhi)(zhi)增高達到新的(de)平衡.