Regular maintenance should be paid attention to for medium pressure piston pumps
The medium pressure plunger pump adopts a dual plunger structure, with small pressure pulsation and long service life of the gemstone ball. The equipment uses imported gemstone plungers and gemstone balls to ensure flow rate. It communicates with a computer through RS232 interface and can be directly controlled by the computer. It has built-in overvoltage protection and flow correction system, and the equipment also adopts a large screen LCD display, which is more user-friendly.
The medium pressure plunger pump should be regularly maintained, and its work is as follows:
1. Check the plunger for scratches and rust, and replace it with a new one if necessary.
2. Check the fit of the plunger pair. Insert the plunger end into the plunger sleeve and tilt it about 60 °. If the plunger can slowly slide down under its own action, it is considered a good fit.
3. Check the sealing of the plunger pair. Grasp the plunger sleeve with your hand and block the oil inlet at the top and side of the plunger with two fingers. Pull out the plunger with the other hand and feel a strong suction force. Release the plunger and immediately retract it to its original position, indicating that the plunger pair is well sealed. Otherwise, the plunger pair should be replaced.
4. Check whether the pressure reducing ring of the oil outlet valve is worn, has steps or scratches, and replace it if necessary.
5. Check the fit of the oil outlet valve pair. Block the lower hole of the oil outlet valve with your finger, and gently press the oil outlet valve downwards with another finger. When the finger leaves the upper end of the oil outlet valve, it can automatically bounce back to its original position, indicating that the oil outlet valve pair is well sealed. Otherwise, the oil outlet valve pair should be replaced.
6. Check the pillar body. The standard clearance between the fuel injection pump body and the plunger body is 0-0.03mm. If it exceeds 0.2mm, the parts should be replaced.
7. Check the gap between the plunger flange and the groove of the control sleeve, which should be 0.02-0.08mm. If it exceeds 0.12mm, the control sleeve must be replaced.