Parker provides a large range of medium pressure industrial piston pumps. Predictably, since this is one of the most recognized names in the hydraulics sector, each series packs a host of performance-tuned features. To achieve this feat, the Parker Pumps engineering chiefs have divided their medium pressure products into four groups of intermediate-strength piston pumps lines. Clearly, each series suits a different application class.
P1 Powered Medium Pressure Piston Pumps
Capable of generating 4000 psi (27 MPa) of fluid pressure, the P1 series uses its variable displacement axial architecture to satisfy moderate needs applications. A forestry crane, medium-sized excavator, even an overly large forklift truck, all of these mobile usage examples have much to gain when they’re backed by this configuration. Basically, the moving parts form a ring of sliding rods, which are arranged around a strong longitudinal axis. A variable angle swash plate regulates the fluid as it ripples through the ring of pistons and shoes. Compact, powerful, and quiet, the P1 series works best when used in open circuit mobile applications.
PD Strengthened Industrial Hydraulics
Since this post is meant to be targeting industrial machinery, let’s move towards a version of the P1 series that delivers an extra shred of raw power. PD medium pressure industrial piston pumps use a similar cast iron profile, but their innards have been opened up a little. As a result of this slightly larger build, the PD series improves on the P1 series’ 250 LPM flowrate by providing a more industry-standard 278 LPM flow capability. All the same, this is still a variable displacement axial piston pump. When the ring of pistons spin around their longitudinal axis, they alternate between being coupled to an inlet port and an outlet port. Hydraulic oil is sucked inside one piston, expelled as the chamber rotates away, then the process repeats.
The Volume-Based PVP Piston Difference
In the two above examples, Parker Pumps designers use a constant fluid volume model. Changing that feature so that a variable volume controller takes charge of the piston-generated fluid force, PVP medium pressure pumps provide several industrially relevant benefits. Granted, they generally work at slightly lower pressures, but they compensate for that drop by delivering higher response times and equally higher productivity increases. Again, an axially mounted piston layout is on display here, but the control of that ring of pumping rods operates on a slightly different principle.
Last in the medium pressure pumps group, as offered by Parker, is the PAVC series. They install on mobile equipment or inside stationary industrial machinery as supercharged hydraulic piston pumps. Fundamentally similar to the above alternative piston-based hydraulics solutions, PAVC gear can pump standard hydraulic fluid, phosphate ester, or water glycol.
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