First, product performance and use: axial piston pump axial piston pump is the direction of the reciprocating motion of the piston or plunger and the cylinder parallel to the central axis of the piston pump. The axial piston pump is working volume variation generated by the reciprocating motion of the plunger bore parallel with the drive shaft of the plunger. As the plunger and plunger holes are circular parts, processing can achieve high accuracy with high volumetric efficiency, smooth operation, flow uniformity, low noise, and high working pressure, but the hydraulic oil pollution more sensitive, more complex structure, a higher cost. Piston pumps pump oil institutions, including two sets of precision coupling: plunger (plunger) + plunger sleeve (barrel) a plunger (plunger and barrel assembly) (Figure 5-11), the oil valve. (Delivery valve ) and outlet valve seat (Delivery valve seat) constitute The oil valve parts (delivery valve assembly plunger and plunger sleeve is a pair of precision coupling, can not be interchanged by paired grinding, high accuracy and finish and good abrasion resistance, its radial gap of 0.002 ~ 0.003mm plunger head cylindrical surface of the chute, and through the radial bore, the axial bore communicating with the top of its purpose is to change the amount of circulating oil; Column plug put the system into the return hole, with the low pressure oil pump body cavity, the plunger set into the pump upper body, the application of the set screw positioning plunger head chute position to change the amount of oil The method is also different from the oil valve and outlet valve seat is also a precision coupling member pairing after polishing can not be interchanged, a line with a gap of 0.01mm. outlet valve is a check valve, under the action of the spring pressure, the upper part of the valve conical seat surface and tight fit, its role is to stop for the high-pressure tubing and plunger isolated from the upper end of the cavity to prevent oil from flowing back into the fuel injection pump high pressure tubing and the lower part of the oil valve was cross-sectional, both oriented, but also through the diesel out the valve cone has a small cylindrical surface, called Decompression ring, its role is to the end of the oil, the oil pressure in the high pressure tubing decreased rapidly, to avoid the spray hole generated at the drip phenomenon. quickly increases, pressure decreases rapidly Minting quickly when the annulus falls within the seat of the upper volume.