daili美國原裝威格士柱塞泵，是由電動機提供泵的動力，經鼓型齒聯軸器帶動減速機轉動。由減速機減速帶動曲軸旋轉。通過曲柄連桿機構，將旋轉運動轉變為十字頭和柱塞為往復運動。當柱塞向后死點移動時，泵容積腔逐步增大，泵腔內壓力降低，當泵腔壓力低于進口壓力時，吸入閥在進口端壓力作用下開啟，液體被吸入；當柱塞向前死點移動時，泵腔內壓力增大，此時吸入閥關閉，排出閥打開，液體被擠出液缸，達到了吸入和排出的目的。
daili美國原裝威格士柱塞泵滑靴與斜盤的滑動磨擦是斜盤柱塞泵三對磨擦副中zui為復雜的一對。 出柱塞桿球頭與滑靴球窩的間隙，如果柱塞與滑靴間隙超差，柱塞腔中的高壓油就會從柱塞球頭與滑靴間隙中泄出，滑靴與斜盤油膜減薄，嚴重時會造成靜壓支承失效，滑靴與斜盤發生金屬接觸磨擦，滑靴燒蝕脫落，柱塞球頭劃傷斜盤。柱塞桿球頭與滑靴球窩超出公差1.5倍時，必須成組更換之
柱塞往復運動總行程L是不變的，由凸輪的升程決定。柱塞每循環的供油量大小取決于供油行程,供油行程不受凸輪軸控制是可變的。供油開始時刻不隨供油行程的變化而變化。轉動柱塞可改變供油終了時刻，從而改變供油量。柱塞泵工作時，在噴油泵凸輪軸上的凸輪與柱塞彈簧的作用下，迫使柱塞作上、下往復運動，從而完成泵油任務，泵油過程可分為以下三個階段。
：任靜
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常用型號 
PVH131L12AF30B282000001AD2AA010A   PVH131C-LAF-12D-11-C28V-31
PVH131L12AF30B252000001AD100010A   PVH131C-LAF-12S-10-C25V-31
PVH131L12AF30B252000001AD1BG010A   PVH131C-LAF-12S-10-C25V-31-159
PVH131L12AF30K250000001AD100010A   PVH131C-LAF-12S-10-EDC25-10
PVH131L12AF30A130000AG1AD1AA010A   PVH131C-LAF-12S-11-C13-31
PVH131L16AF30A250000001AD100010A   PVH131C-LAF-16S-10-C25-31
PVH131L16AF30B252000001AD100010A   PVH131C-LAF-16S-10-C25V-31
PVH131L16AF30D180006001AT1AA010A   PVH131C-LAF-16S-11-C18T6-31-CD-031
PVH131L16AF30D250004001AD1AA010A   PVH131C-LAF-16S-11-C25T4-31
PVH131L02AF30B212000001AD200010A   PVH131C-LAF-2D-10-C21V-31-036
PVH131L02AF30B212000001AD2AA010A   PVH131C-LAF-2D-11-C21V-31-036
PVH131L03AF30E272015001AD2AA010A   PVH131C-LAF-3D-11-C27VT15-31
PVH131L03AF30A250000001AD100010A   PVH131C-LAF-3S-10-C25-31
PVH131L03AF30B252000001AD100010A   PVH131C-LAF-3S-10-C25V-31
PVH131L03AF30E252004001AD1AA010A   PVH131C-LAF-3S-11-C25VT4-31
PVH131L03AF30F282014001AT1AA010A   PVH131C-LAF-3S-11-C28VT14S-31-31
PVH131L12AF30B252000001AJ200010A   PVH131C-LBF-12D-10-C25V-31
PVH131L12AF30B252000001AJ100010A   PVH131C-LBF-12S-10-C25V-31
PVH131L12AF30B252000001AY100010A   PVH131C-LBF-12S-10-C25V-31-114
PVH131L12AF30B502000001AJ1AA010A   PVH131C-LBF-12S-11-C31V-31
PVH131L02AF30B162000001AJ1AA010A   PVH131C-LBF-2S-11-C16V-31
PVH131L02AF30B252000001AJ1AA010A   PVH131C-LBF-2S-11-C25V-31
PVH131L03AF30B252000001AJ1AA010A   PVH131C-LBF-3S-11-C25V-31
PVH131L12AF30B252000001AM2AA010A   PVH131C-LCF-12D-11-C25V-31
PVH131L12AF30B482000001AA1AA010A   PVH131C-LCF-12S-11-C275V-31-CD-114
PVH131L16AF30B252000001AM100010A   PVH131C-LCF-16S-10-C25V-31
PVH131L03AF30B252000001AM1AA010A   PVH131C-LCF-3S-11-C25V-31
PVH131L12AF30A250000001002AA010A   PVH131C-LF-12D-11-C25-31
PVH131L12AF30B25200000100100010A   PVH131C-LF-12S-10-C25V-31
PVH131L12AF30B252000001001AM010A   PVH131C-LF-12S-10-C25V-31-118
PVH131L33AF30B252000001002AA010A   PVH131C-LF-13D-11-C25V-31-259
PVH131L13AF30A25000000100100010A   PVH131C-LF-13S-10-C25-31
PVH131L13AF30B25200000100100010A   PVH131C-LF-13S-10-C25V-31
PVH131L13AF30B192000AK1001AA010A   PVH131C-LF-13S-11-C19V-31-188
PVH131L13AF30B252000001001AA010A   PVH131C-LF-13S-11-C25V-31
PVH131L29AF30B25200000100100010A   PVH131C-LF-29S-10-C25V-31-046
PVH131L29AF30B25340000100100010A   PVH131C-LF-29S-10-C25V34-31-CD-046
PVH131L02AF30B21200000100200010A   PVH131C-LF-2D-10-C21V-31-046
PVH131L02AF30B252000001002AA010A   PVH131C-LF-2D-11-C25V-31
PVH131L02AF30B252000001008AA010A   PVH131C-LF-2D-11-C25V-31-214
PVH131L02AF30B25200000100100010A   PVH131C-LF-2S-10-C25V-31-046
PVH131L02AF30B252000AL1001AP010A   PVH131C-LF-2S-10-C25V-31-208
PVH131L02AF30B192000AA1001AA010A   PVH131C-LF-2S-11-C19VB-31-CD
PVH131L02AF30B252000001001AA010A   PVH131C-LF-2S-11-C25V-31-046
PVH131L02AF30B253100001001AA010A   PVH131C-LF-2S-11-C25V31-31
PVH131L02AF30B282000AR1001AT010A   PVH131C-LF-2S-11-C28VB-31-220
PVH131L02AF30B282000BK1001AT010A   PVH131C-LF-2S-11-C28VB-31-255
PVH131L03AF30B172000001002AA010A   PVH131C-LF-3D-11-C17V-31
PVH131L03AF30A25000000100100010A   PVH131C-LF-3S-10-C25-31
PVH131L03AF30B25200000100100010A   PVH131C-LF-3S-10-C25V-31
PVH131L03AF30K25000000100100010A   PVH131C-LF-3S-10-EDC25-10
PVH131L03AF30E252015001001AA010A   PVH131C-LF-3S-11-C25VT15-31
PVH131L12AJ30B252000002001AA010A   PVH131C-LSF-12S-11-C25V-31
PVH131L13AF30A25000000200100010A   PVH131C-LSF-13S-10-C25-31
PVH131L02AJ30B252000002001AA010A   PVH131C-LSF-2S-11-C25V-31