REXROTH柱塞泵的泵油機構包括兩套精密偶件：柱塞（plunger）+柱塞套(barrel)構成柱塞偶件(plunger and barrel assembly)（圖5-11）、（delivery valve）和出油閥座(delivery valve seat)構成出油閥偶件(delivery valve assembly

柱塞和柱塞套是一對精密偶件，經配對研磨后不能互換，要求有高的精度和光潔度和好的耐磨性，其徑向間隙為0.002～0.003mm

柱塞頭部圓柱面上切有斜槽，并通過徑向孔、軸向孔與頂部相通，其目的是改變循環供油量；柱塞套上制有進、回油孔，均與泵上體內低壓油腔相通，柱塞套裝入泵上體后，應用定位螺釘定位。

柱塞頭部斜槽的位置不同，改變供油量的方法也不同。

出油閥和出油閥座也是一對精密偶件，配對研磨后不能互換，其配合間隙為0.01mm 。

出油閥是一個單向閥，在彈簧壓力作用下，閥上部圓錐面與閥座嚴密配合，其作用是在停供時，將高壓油管與柱塞上端空腔隔絕，防止高壓油管內的油倒流入噴油泵內。

出油閥的下部呈十字斷面，既能導向，又能通過柴油。出油閥的錐面下有一個小的圓柱面，稱為減壓環帶，其作用是在供油終了時，使高壓油管內的油壓迅速下降，避免噴孔處產生滴油現象。當環帶落入閥座內時則使上方容積很快增大，壓力迅速減小，停噴迅速。

REXROTH柱塞泵：部分型號

A4VG71DWDMT2/23L-NZF02F041D,
A4VG250HD1D1/32LNZD10F001S,
A4VG125HD1D2/32R-NTF02F691P,
A4VG125HD1D2/32R-NSF02F02F021P,
A4VG125HDMT1-32R-NSF02F691S-S,
A4VG125EP2/32+A10V028DR/31 ,
A4VG125HDMT1/32R-NSFO21S-S ,
A4VG125HD1D2/32R-NSF001S,
A4VG125HD1D2/32R-NSF001S,
A4VG125HD1D2/32R-NSF001S,
A4VG125HD1P1/32R-N2D10F69, 
A4VG125EP2D1/32R-NAF02K691EP-4 ,
A4VG125DA2D2/32R-NAF02F021DT,
A4VG56EZ2DM1/32L-NSC02F013SH-K,
A4VG56EZ2DM1/32R-NSC02F013SH,
A4VG90HWDL1/32R-NAF02F071L-S+A, 
A4VG90HWDL1/32L-NZF02F001S-S B,
A4VG125EP2D1/32R-NAF02K691EP-4,
A4VG125EP2DT1/32R-NAF02F011S,
A4VG125HD1D2/32R-NTF02F691P ,
A10VSO28DFR1/31R-PPA12N00,
A10VSO45DFR1/31R-PPA12N00,
A10VSO71DFR1/31R-PPA12N00,
A10VSO100DFR1/31R-PPB12N00,
A10VSO140DFR1/31R-PPA12N00,
A10VSO45DFR1/32R-PPB12N00,
A10VSO100DFR1/32R-PPB12N00,
A10VSO071DFR1/32R-VPB12N00,
A10VSO140DFR1/32R-VPB12N00,
A10VSO140DRS/32R-VPB22U99,
A10VSO140DFLR1/31R-PPB12KO1,
A10VSO45DFR1/31R-PPA12N00,
A10VS0100DR/31R-PPA12N00,

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