In this blog post, we will discuss the fifth of five industrial compressor capacity control modes. A very efficient method of controlling a compressor at part load using variable speed mode. With this type of compressor, an electronic drive is fitted to a specially designed compressor with air end components matched to the intended speed […]
Where are ground compression springs used in hydraulics?
By Josh Cosford, Contributing Editor During everyone’s basic training in fluid power, we talk about “spring-centered” this and “spring-retract” that. Springs are used in nearly every component in hydraulics; valves, pumps and cylinders. So prolific in hydraulic components that it’s clear we’re taking springs for granted. Ground compression springs are used in most pressure valves…
Compressed air fail: Load/unload
In this blog post, we will discuss the third of five industrial compressor capacity control modes. A moderately efficient method of controlling a compressor at part load uses load/unload mode with adequately sized storage receiver capacity. With this mode, a pressure switch, or electronic control, is used to provide load and unload signals to the […]
Compressed air fail: Modulating mode
In this blog post, we will discuss the second of five industrial compressor capacity control modes. The least efficient method of controlling a compressor at part load is using modulating mode by way of pneumatically controlled inlet valve control. With this mode, a pneumatic system detects the compressor discharge pressure and compares it to a […]
Compressed air fail: Start/stop mode
In this blog post, we will discuss the first of five industrial compressor capacity control modes. The simplest method of controlling a compressor is Start/Stop mode using pressure switch control. This control simply turns on the compressor to run at full load when the pressure hits a lower pressure level — and turns off the […]
Hydraulic oil analysis part 6 — what is spectrometry?
By Josh Cosford, Contributing Editor This is part 6 in this series on hydraulic oil analysis, and if you’ve missed any of the previous issues, you can find them here — part 1, part 2, part 3, part 4, and part 5. I’ve covered everything from viscosity to water saturation already, and we’re not done […]
7 ways to reduce weight on mobile hydraulic machines
By Josh Cosford, Contributing Editor One of the few disadvantages of hydraulics is the mass added to components capable of withstanding thousands of pounds of pressure. Of course, the raison d’ệtre of hydraulics is the transfer of pressurized fluid to achieve work. But do high-pressure components have to be high mass, especially on mobile machines? […]
Hydraulic oil analysis part 5 — acidity and its impacts
By Josh Cosford, Contributing Editor In part 5 of this series covering hydraulic oil analysis, we move on to discuss acidity. As it pertains to hydraulic oil, we need to know the total amount of acidic substances found within the sample. Most commonly referred to as the Total Acid Number, or TAN for short, the […]
Why is your hydraulic cylinder moving slowly?
By Josh Cosford, Contributing Editor If your hydraulic cylinder is moving slowly and you’re reading this article, your cause is not likely a lazy operator. Your situation is obviously one where an expected performance isn’t being met, or there was a sudden and dramatic slowdown of your cylinder velocity. Diagnosing the cause of a cylinder…
Where and when should you use wire-reinforced hose?
By Josh Cosford, Contributing Editor Hydraulic hoses come in many sizes and designs, and the expression of each design is a result of the purpose of that hose. Generally, there are three common locations where a hose is used in a hydraulic system: suction lines, working lines and return lines. Each location has its own […]
4 key considerations when choosing electric motors and equipment
Contributed by Enrique Busquets • Director of Engineering Systems and Components, Bosch Rexroth Fueled by unceasing innovation, electric motors have solidified their position as a catalyst for change, reducing countries’ greenhouse gas emissions (ghg) and lowering total cost of ownership for heavy- and medium-duty vehicles and machinery. The accelerated adoption of electric motors has been […]
Why use point-of-use dryers with compressed air systems?
It is common to see the air in a complete plant dried by a desiccant dryer only to service one small end-use that is subject to freezing temperatures. The purge from a large desiccant dryer is much more costly than that of a small point-of-use dryer, which can be placed on the outdoor feed. The […]
Polyethylene versus nylon tubing — who wins the pressure war?
By Josh Cosford, Contributing Editor In the bustling battlefield of pneumatic systems’ hose and tubing, two contenders stand ready for combat: polyethylene and nylon tubing. Armed with unique strengths and weaknesses, they prepare to face off in the high-pressure war, so let’s dive into this skirmish and see who emerges victorious. Round 1: The Durability […]
Gain an inside look into aircraft hydraulic systems
Understanding the intricacies of aircraft hydraulic systems provides insight into the engineering marvels that keep aircraft flying safely through varying conditions. By Josh Cosford, Contributing Editor Aircraft hydraulic systems are a special breed of essential components in modern aviation, providing the power and control necessary for various functions that provide the safe and efficient flights…
Which pneumatic technology is best for linear motion applications?
In linear motion applications, pneumatics, servo pneumatics, and controlled pneumatics each deliver unique motion and force capabilities. Contributed by By Frank Langro, Director of Product Market Management, Pneumatic Automation, Festo Pneumatic linear actuators are fundamental for automation because of their low cost, ease of installation and operation, high yet compliant force, speed, compactness, safety in hazardous areas, […]
How to ensure proper hydraulic fitting assembly
Contributed by Gary Molton • BSc, Owner, Engineering Adventures Poor assembly or using the wrong type of fluid power fitting has been shown to increase risk of fluid leakage and industrial injury. Fitting designs have changed considerably over the last 30 years to reduce these risks but this has resulted in a myriad of assembly […]
Comparing electric versus hydraulic motors
By Josh Cosford, Contributing Editor Comparing electrical with hydraulics is one of my favorite topics to write about. When you study both fields, you quickly realize how much the concepts, mathematics and symbology coincide. However, not all readers share my same enthusiasm for the analogy. Many years ago, one LinkedIn member commented that I was […]
When to use (or not use) BSPT fittings?
By Josh Cosford, Contributing Editor If you’re not terribly familiar with hydraulic fittings, you may think BSPT is a typo. Is it supposed to be BSPP (British Standard Pipe Parallel) or perhaps NPT (National Pipe Thread)? No, it’s not a typo – we’re actually talking about British Standard Pipe Taper, which is the version of […]
When should you use counterbalance valves?
By Josh Cosford, Contributing Editor Counterbalance valves are an ingenious invention used to control runaway loads caused by mass or gravity attempting to push or pull outside of intentional movement. There are many ways to control a load or prevent it from moving, such as flow control valves or pilot-operated check valves. However, a counterbalance […]
Hydraulic oil analysis part 4 — water’s impact
By Josh Cosford, Contributing Editor In Part 4 of the hydraulic oil analysis series, we will tackle one of the most essential qualities of hydraulic oil you must test and understand. Particle contamination, for example, may take months or years to erode critical components to the point of failure, but water infiltrating your pumps, valves, […]
Increasing hydraulic efficiency outside of pump selection
By Josh Cosford, Contributing Editor Let’s be clear that pump selection is the quickest way to increase hydraulic system efficiency, as one can easily improve your energy ROI by 15% or more simply by upgrading from a gear to a piston pump, for example. But pumps aren’t the only way to increase your efficiency, thereby…
How CAN makes mobile hydraulic control more reliable and precise
By Josh Cosford, Contributing Editor In the realm of mobile hydraulics, we must prioritize efficiency, reliability, and precision to remain competitive against other technologies. In many cases, hydraulic advancements come from partnerships with competing technologies, and one of the most important in recent years is Controller Area Network (can) networks. CAN networks revolutionize mobile hydraulics […]
What are the common hydraulic hose specification standards?
By Josh Cosford, Contributing Editor We tend to walk through life enjoying what seems to be infinite consumer and commercial goods without consideration for the vast technological achievements that led to their existence. Every new technology rides on the shoulders of a previous advancement in either materials, construction, technology, or process. Very little in our […]
Hydraulic oil analysis – measuring and controlling particle contamination
By Josh Cosford, Contributing Editor Particle contamination is the proverbial lord of the contamination cartel. Particles get all the attention in this world, and rightfully so. Particle contamination-related failures likely outpace water, varnish and heat combined (yes, heat is a form of contamination). It would come as no surprise, then, that the primary driver of […]
Where are buffer seals used on hydraulic cylinders?
By Josh Cosford, Contributing Editor Sometimes, there’s a practical and propitious device that’s been around forever, only to be discovered by happenchance, yet it provides immense value and serendipity. I have been known to use hyperbole in my writing, and maybe so here. Still, if this article convinces just one reader to use this simple […]