Reasons for oil leakage during operation of American Parker plunger pumps

Brand

PARKER/American Parker

Application Areas

Environmental Protection, Chemical Industry, Petroleum, Energy, Road/Rail/Marine Engineering

The American Parker piston pump is a type of reciprocating pump, belonging to the category of volumetric pumps. Its piston is driven by the eccentric rotation of the pump shaft, resulting in a reciprocating motion. Both its suction and discharge valves are one-way valves. When the piston is pulled outward, the pressure in the working chamber decreases, the outlet valve closes, and when the pressure is lower than the inlet pressure, the inlet valve opens, allowing liquid to enter. When the piston is pushed inward, the pressure in the working chamber increases, the inlet valve closes, and when the pressure is higher than the outlet pressure, the outlet valve opens, allowing liquid to exit. When the drive shaft drives the cylinder block to rotate, the swashplate pulls the piston out of or pushes it back into the cylinder block, completing the oil suction and discharge process. The oil in the working chamber formed by the piston and cylinder bore communicates with the pump's suction and discharge chambers through the distribution plate. The variable displacement mechanism is used to change the swashplate angle; by adjusting the swashplate angle, the pump's displacement can be changed.

The main causes of oil leakage in American Parker piston pumps are as follows:

(1) Damaged spindle oil seal or defects/scratches on the shaft;

(2) Excessive internal leakage, causing increased pressure at the oil seal, which damages or blows it out;

(3) The drain pipe is too thin or too long, causing leakage at the seal;

(4) Loose external oil pipes, damaged pipe joints, aged or cracked gaskets;

(5) Loose bolts in the variable adjustment mechanism, resulting in seal damage;

(6) Sand holes or poor welding in the cast iron pump housing.

American Parker piston pumps utilize the volume change generated by the reciprocating motion of a piston parallel to the drive shaft within the piston bore. Because both the piston and piston bore are circular parts, high precision fitting can be achieved during machining, resulting in advantages such as high volumetric efficiency, stable operation, good flow uniformity, low noise, and high working pressure. However, they are more sensitive to hydraulic oil contamination, have a more complex structure, and are more expensive.

American Parker piston pumps generally employ a rotating cylinder body and end-face flow distribution. The cylinder block end face is inlaid with a friction pair consisting of a bimetallic plate and a steel distributor plate, and most of them use a planar distribution method, making maintenance relatively convenient. The distributor plate is one of the key components of the axial piston pump. During pump operation, on the one hand, the high-pressure oil in the working chamber pushes the cylinder block towards the distributor plate; on the other hand, the oil film pressure between the distributor plate and the cylinder block creates a hydraulic counterforce on the cylinder block, causing the cylinder block to move away from the distributor plate. The designed hydraulic clamping force Fn of the cylinder block on the distributor plate is slightly greater than the hydraulic counterforce Ff of the distributor plate on the cylinder block, i.e., Fn/Ff = 1.05~1.1, ensuring normal pump operation and maintaining high volumetric efficiency.

Commonly Used Parker Piston Pump Models (USA):

PARKERD1FVE02BCVF0A

PARKERDERPRDM2PP16KVG

PARKERD3W004CNTW

PARKERD3W004CNJW

PARKERD3W004CNJW (Made in China)

PARKERD1VW020BNJW

PARKERD41FCE01FC1NE70

PARKERD1SE83BNJW

PARKERD1VW020DNJGG5

PARKERDERPSB100SF1A5

PARKERD91FCB31HC2NB70

PARKERD91FCE01HC2NE70

PARKERD31FCE01DC4NB70

PARKERD31FCE01CC4NB70

PARKERD31FCE02DC1NB70 PARKER9C800B

PARKERD1VW004KNJW

PARKERTG0475US030AAAB

PARKERD1FVE02CC0NM03

PARKER026-57374-H 4D02 3201 0302 D1G0Q

PARKERD1FVE02CC0VKW310

PARKERC10C1E050CS99V

PARKER026-57366-H | 4D02 3151 0101 D1G0Q

PARKERS1-024000

PARKERPV063R1D1T1NMMC4545 The company mainly deals with European and American brands and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson Group)

American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, VICKERS, ROSS

British brands: Norgren

Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi