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Tips on How to Determine Hydraulic Fluid Velocity

Do you need help figuring out how to determine the right hydraulic fluid velocity for your hose assemblies? If you aren’t quite sure what to do, give us a call. Our team of hydraulic repair specialists has pretty much seen it all. We offer a full line of hydraulic services, including pump repair, motor repair, final drive repair, and on-site visits. Get in touch with us today for a repair estimate, or P and D on a new or remanufactured pump or motor.

Quick Tips to Determine Hydraulic Fluid Velocity

  1. When you replace couplings, make sure you use the same size.
  2. If you replace a hose with one that has a smaller inside diameter, you need to calculate the flow velocity.
  3. Use the Gates Fluid Flow Pressure Calculator to calculate flow velocity.

Hydraulic Hose Size is Important to Achieving the Correct Fluid Velocity

Suppliers of hydraulic hose assemblies will face this common scenario: An end-user brings in a worn-out hydraulic hose to be replaced, but the couplings needed for this particular size hose are out of stock, backordered or the store doesn’t stock the couplings needed to replicate the original hose assembly. However, you do stock the correct couplings in a smaller hose size inside diameter (ID).

The logical solution might be to rebuild the hose assembly using the smaller size hydraulic hose with a jump-size fitting. Though this may seem like a harmless solution, replacing a hose assembly with a smaller hose size than what was designed for that hydraulic system could cause unintended harm and create inefficiency to the equipment.

Injection Molding Machine, Hydraulic Repair

This injection molding machine relies on hydraulic hoses.

Flow velocity is determined by both the hydraulic pump’s flow rate and the hydraulic hose size. Changing the flow rate of the hydraulic pump but leaving the hydraulic hose size the same will affect flow velocity. In contrast, keeping the flow rate the same but changing the hose size will affect flow velocity.

Flow velocity is an important consideration when replacing a larger hydraulic hose ID with a smaller hydraulic hose ID. When an existing hydraulic hose is replaced with a new hydraulic hose that has a smaller ID, the same amount of fluid that was flowing through the original, larger hydraulic hose is now forced through the new, smaller hose. This will restrict flow and increase downstream pressure, thus causing flow velocity to increase.

Read the full article at Machine Design »

Experts in Hydraulic Repair Services and Solutions

If you need someone that can help you fix any piece of your hydraulic system, conduct testing, or help you develop a maintenance plan, we have you covered. We are an independent hydraulic repair shop and our veteran team has the hands-on know-how and access to state-of-the-art technology to help you out. We have repaired, rebuilt, and remanufactured hydraulic units for customers all over the world and we are proud of our track record and the relationships we have built with our customers and companies like Bosch Rexroth, Linde, and Oilgear.

On-Site Hydraulic Repair, Field Service, and Consultation Near You

We can send our field technicians to your location for on-site inspection and repair. If your operation has stopped, we can help get your pump back up and running as soon as possible. Our reliable, experienced team can perform diagnostic services and minor repairs for equipment and machinery used in many industries. Our team can travel throughout the United States and we have even traveled to international locations.

Same Day Hydraulic Repair

If repairs cannot be made on-site, then ship it to our facility. If you’re close enough, you can drop it off. If you get it to us by 10:00 AM, and we have the same model in stock, we’ll repair it and have it ready to ship by 5:00 PM the same day.

Our Guarantee to You and Commitment to Quality

When you send us your unit, we guarantee:

  • We will only use genuine OEM replacement parts.
  • If you ship it to us, we will thoroughly test your unit on our test stands.
  • We will only ship it back to you if it meets or exceeds OEM specifications.