Description
Product details
Hey there, hydraulic enthusiasts! Let’s get real about the backbone of so many hydrostatic systems—the Bosch Rexroth A10VO and A10VSO Series 31 axial piston pumps. If you're knee-deep in specs trying to figure out the perfect pump for your application, you've probably stumbled across these three model numbers: A10VO28DR/31R-PPC12N00M, A10VO28DFR/31R-PPA12N00, and A10VSO28DFR1/31R-VPA12N00. On the surface, they look like a complex series of letters and numbers, but once you break them down, they tell you everything about what the pump can do. At Advance Hydraulic Works, we know these models inside and out. So, let’s break down the code and help you pick the right component for the job . The “28“ & “Series 31“ Foundation First, let's look at the commonalities. All three pumps share a robust foundation. The “28“ refers to the nominal displacement—meaning these pumps move 28 cc of hydraulic fluid per revolution . They are part of the “Series 31,“ the latest evolution of this design, known for its increased power density and reliability . They are all swashplate design variable displacement pumps intended for open circuit operation, meaning the fluid returns to a reservoir . They can handle a nominal pressure of 280 bar and a peak pressure of 350 bar, making them suitable for medium-to-high pressure industrial and mobile applications . Understanding the “Controller“ Codes Where these models really diverge is in their control mechanisms—the heart of how the pump responds to system demands. 1. A10VO28DR/31R-PPC12N00M: The Simplicity of Pressure Control This model features the “DR“ designation, which stands for Pressure Control. In plain English, this is a “pressure compensator“ pump. It’s designed to maintain a constant pressure regardless of flow demand . It’s ideal for systems where you need a steady force, like clamping or pressing applications. This specific model, sourced from a procurement case, is often used in specialized control oil pump applications . 2. A10VO28DFR/31R-PPA12N00: The Versatile Standard Next, we have the “DFR,“ which stands for Pressure and Flow Control. This is a load-sensing pump. Unlike the DR, which focuses solely on pressure, the DFR uses a downstream orifice to balance flow and pressure, resulting in significant energy savings and reduced heat generation . If your system experiences varying flow demands—like a machine that cycles between fast and slow movements—the DFR is your efficient go-to. 3. A10VSO28DFR1/31R-VPA12N00: The Upgrade This model is the “DFR1.“ It’s the big brother to the DFR. It is functionally the same pressure and flow control, but the “1“ indicates that the X-channel (used for external pilot pressure) is internally plugged . This simplifies the plumbing in certain systems and is often the preferred choice for modern designs. The Code Breaker: Shafts, Seals, and Mounts The suffix codes are just as important as the controllers. They dictate how you install the pump. Rotation (R & L): The “R“ in all models stands for Clockwise Rotation (when viewed from the shaft end) . Make sure your prime mover spins the right way! Seals (P & V): “P“ usually stands for NBR (Nitrile) seals, which are excellent for standard mineral oils. The “V“ stands for FKM (Viton) , a premium material that offers superior resistance to high temperatures and aggressive fluids . For example, the A10VSO28DFR1 ends with “VPA“ indicating Viton seals. Shaft Ends (P & S): “P“ typically refers to a metric parallel keyed shaft, the most standard option. “S“ would indicate a splined shaft . Mounting Flanges: Codes like “PC,“ “PP,“ or “VP“ reflect the specific combination of mounting flange (e.g., ISO or SAE) and port connections (e.g., metric or UNC threads) . Conclusion: Which One Do You Need? Choosing the right pump comes down to your application's behavior. Go for the A10VO28DR if you need a straightforward, reliable pump that maintains a fixed pressure. Choose the A10VO28DFR if you want the efficiency of a load-sensing system that optimizes flow based on demand. Select the A10VSO28DFR1 if you need the load-sensing capability but prefer the simplified circuit design. Need help deciding? The experts at Advance Hydraulic Works are ready to assist you in selecting and maintaining the perfect pump for your hydraulic system. Frequently Asked Questions (FAQs) Q1: What is the main difference between “DR“ and “DFR“ controllers on these pumps? A: The “DR“ is a pure pressure compensator; it runs at full flow until it reaches the set pressure and then cuts flow. The “DFR“ is a load-sensing flow and pressure controller that only uses the energy required to perform the work, making it much more efficient in systems with variable flow demands . Q2: Are these pumps interchangeable with other brands? A: These models are specifically designed to Bosch Rexroth's exacting standards. While aftermarket and genuine alternatives exist, the mounting flange, shaft, and porting are standardized.
