Understanding Oil Flow and Pressure Loss: Key Insights for Hydraulic Parts Distributors

Efficient oil flow is the lifeblood of any hydraulic system. It ensures that components operate smoothly, reliably, and without unnecessary strain.

Yet, one of the most common — and costly — issues in hydraulic systems is pressure loss, which can lead to reduced performance, overheating, and premature wear.

For hydraulic parts distributors, understanding the relationship between oil flow and pressure loss is critical. It allows you to guide your customers in selecting the right components, maintaining system efficiency, and addressing potential issues before they escalate.

Here’s what you need to know to provide valuable advice and solutions to your end-users.

The Basics: What Causes Pressure Loss?

Pressure loss occurs when the hydraulic system encounters loses to the resistance to the flow of oil. While some resistance is inherent in any system, excessive pressure loss can indicate design flaws, improper component selection, or maintenance issues.

When system pressure deviates from what is expected, it’s an indication that something is wrong. Low system pressure is certainly a problem, but it is just a symptom of a bigger source problem such as a leak or faulty component.

A good starting point is to attain a system schematic to understand where possible trouble spots could exist within the hydraulic circuit.

Knowing the pressure readings of the system’s main components will be required. Multiple components can create various competing flow paths, so measuring and understanding them is key to identifying why a pressure drop is happening.

Some typical culprits behind low hydraulic system pressure are:

Dirty pump strainers
• Worn or damaged components: Pay particular attention to leaky hose connections, valve seals, or cylinder seals
Water contamination
Damaged pump: Variable displacement pumps may function but have damaged piston or vane rotating groups, along with a damaged pressure compensator
Malfunctioning of variable displacement mechanisms
Relief or unloading valves

For distributors, helping end-users identify and address these factors can prevent larger system failures and costly downtime.

Best Practices for Reducing Pressure Loss

To maintain optimal system performance, distributors should educate end-users on these best practices:

Select the Right Hose Sizes: Always recommend hoses sized to match the system’s flow rate and operating pressure. We recommend getting a copy of the Fluid Power Data Book to help determine the correct size hose that matches operating pressure.
Minimize Bends and Fittings: Encourage end-users to design layouts with fewer bends and fittings. Straight runs or gentle curves help reduce turbulence and maintain pressure.
Monitor and Maintain Oil Quality: Contaminated or degraded oil increases viscosity and clogs components. Emphasize the importance of regular oil analysis and replacement.
Use the Right Oil for the Application: Ensure end-users choose oil with the appropriate viscosity and additives for their system and operating environment.
Inspect and Replace Valves Regularly: Replacing them before they fail minimizes unexpected pressure loss and downtime.

How Distributors Can Add Value

As a distributor, you have the tools and expertise to go beyond simply supplying parts.
Here’s how you can add value:

Offer Sizing Tools and Calculators: Provide your customers with digital or physical tools to calculate optimal hose sizes and flow rates for their systems.
Host Training Sessions: Educate your customers on the principles of oil flow and pressure loss, using hands-on demonstrations or virtual webinars.
Stock High-Quality Components: Partner with trusted suppliers like Hydraulic Parts Source to ensure you’re offering products designed to minimize pressure loss, such as smooth-bore hoses and low-resistance valves.
Provide Troubleshooting Support: Equip your team to diagnose common pressure loss issues and recommend practical solutions for end-users.

Partnering with Hydraulic Parts Source

When you work with HPS, you gain access to a comprehensive inventory of high-quality components, from precision-engineered hoses to advanced filtration systems.

Our team understands the complexities of oil flow and pressure loss and can support you in delivering solutions that keep your customers’ systems running smoothly.

Oil flow and pressure loss may seem like small details in the broader context of hydraulic systems, but they have a profound impact on performance and reliability.

Hydraulic Parts Source is a leading fluid power remanufacturer, and we’re ready to serve you. Contact us today to discuss forming an alliance by calling (866) 514-8451 or get a quote by emailing sales@hydparts.com.