Aggressive Hydraulics President and Founder Paul Johnson recently joined Eric Lanke, host of the National Fluid Power Association’s Fluid Power Forum podcast, for a discussion about hydraulic cylinder engineering, manufacturing, and the technologies shaping the industry.
Drawing on more than 40 years of experience, Paul shares his perspective on hydraulic cylinder design, the importance of understanding real-world operating conditions, and why collaboration between equipment manufacturers and hydraulic cylinder engineers is essential to developing reliable, application-specific solutions.
Watch the Fluid Power Forum Podcast
An Engineering-First Approach to Hydraulic Cylinders
Paul’s experience in hydraulic cylinder design and manufacturing began in 1984, when he worked as a test engineer for an industrial tie-rod cylinder manufacturer. His early responsibilities included product testing, failure analysis, endurance testing, and engineering improvements.
After gaining experience in both industrial and mobile hydraulic cylinder manufacturing, Paul founded Aggressive Hydraulics in 2002.
From the beginning, the company focused on challenging applications that required more than standard, off-the-shelf cylinder solutions. Rather than compete primarily in high-volume commodity manufacturing, Aggressive Hydraulics pursued applications where specialized engineering and manufacturing expertise could make a measurable difference.
That philosophy continues to guide the company’s Purpose-Built™ approach to hydraulic cylinder design and manufacturing.
Understanding Different Hydraulic Cylinder Technologies
During the conversation, Paul explains several hydraulic cylinder designs and the considerations that influence their use.
- Integrated Valve Cylinders: Incorporating cartridge valves and valve cavities into the cylinder assembly can reduce external plumbing, create more compact installations, and simplify equipment integration.
- Telescopic Hydraulic Cylinders: Multiple nested stages provide extended stroke lengths within limited retracted space. Applications include dump trucks, refuse collection equipment, and other mobile machinery.
- Welded Hydraulic Cylinders: Common in construction, mining, and mobile equipment, these cylinders use welded components and mounting configurations tailored to equipment requirements.
- Smart Hydraulic Cylinders: Integrated position-sensing technology provides feedback for automation, motion control, positioning, and equipment safety.
Paul also discusses the differences between single-acting and double-acting hydraulic cylinders, along with how each design supports different operating requirements.
Why Hydraulic Cylinder Design Starts with the Application
One of the central themes of the discussion is the importance of understanding how a hydraulic cylinder will operate throughout its service life.
System pressure alone does not always reflect the forces and conditions experienced by the cylinder. Pressure spikes, duty cycles, mounting arrangements, environmental exposure, and equipment geometry can all influence performance and service life.
Paul emphasizes the importance of selecting appropriate mounting configurations, maintaining proper cylinder alignment, and involving hydraulic cylinder engineers early in the equipment design process.
For OEMs and equipment manufacturers, this collaboration helps establish the space, mounting geometry, and operating requirements necessary for a properly engineered cylinder.
Manufacturing Quality Begins with Engineering
Hydraulic cylinder quality involves more than inspection and testing. As Paul explains, it begins with a design appropriate for the application and continues through controlled manufacturing processes.
Welded hydraulic cylinders present particular manufacturing challenges, including welding distortion, machining tolerances, and dimensional consistency.
Proper machining, honing, process control, and manufacturing equipment all contribute to repeatable product quality.
Whether producing a single cylinder or a production run of 100, maintaining dimensional and functional consistency is essential for reliable hydraulic system performance.
The Future of Hydraulic Cylinder Technology
Looking ahead, Paul identifies several areas of continuing development within the hydraulic cylinder industry.
Advancements in sealing materials and wiper designs are improving sealing performance. Position-sensing devices are becoming smaller and more capable, with improved resistance to shock, temperature extremes, and electrical interference.
Compact cartridge valve technology is also expanding opportunities to integrate hydraulic control functions directly into cylinder assemblies.
The discussion also addresses electrohydraulic actuators and the potential for more compact, integrated hydraulic systems.
These developments continue to create new opportunities for equipment manufacturers seeking improved control, performance, and packaging efficiency.
Purpose-Built Hydraulic Cylinders from Aggressive Hydraulics
For OEMs and equipment manufacturers, selecting the right hydraulic cylinder requires a clear understanding of the application, operating environment, and performance requirements.
At Aggressive Hydraulics, our engineering and manufacturing teams work with customers to develop Purpose-Built™ hydraulic cylinders designed around those requirements.
From initial concept through manufacturing and testing, our focus is on delivering hydraulic cylinder solutions for demanding mobile and industrial applications.
Learn more about our custom hydraulic cylinder engineering and manufacturing capabilities, or contact our team to discuss your application.
Aggressive Hydraulics. The Hydraulic Cylinder Specialists®.
