Plunger oil pump

The utility model discloses a plunger oil pump, including the pump body, the spout is seted up to traveller, the pump body, and pump body both ends form the through -hole with spout UNICOM respectively, and the traveller setting can be along the upper and lower reciprocating motion of spout in the spout and under the effect of external force, and the support has and can promote the traveller and shift up the elastic component that resets between the bottom of traveller and the diapire of spout, left valve body of installation and right valve body in the through -hole, traveller, left valve body, right valve body and the equal sealing connection of the pump body make and form inclosed hydraulic pressure cavity in the pump body, left side valve body all sets up the fluid passageway with right valve body, the fluid passageway all with hydraulic pressure cavity UNICOM, all install control fluid passageway in each fluid passageway and open or closed switching subassembly, every switching subassembly all includes s