Fluid Power Journal

Elevator Stopping

A simple circuit was designed to lift a service elevator up from the basement to the third floor. The HPU had a pressure-compensated pump and a three-position …

Problem: Calculate This

Given: Coefficient of Friction: .2 Cylinder: 4″ x 20″ x 2″ 1. Calculate the pressure to retract the load. 2. Calculate the distance that the …

Oil Rig Top Drive Knocking Noise in the Pump

A drill rig operator was complaining about a knocking noise coming from his top-drive HPU. It controlled a hydraulic motor that drove a winch attached to the …

Problem: What Is The Easiest Fix?

Why doesn’t the adjustable flow control regulate the speed to open a door equipped with an automatic door closer? What is the easiest fix? The original …

Gold Mine Crusher with Erratic Pressure

A hydraulic power unit operating a rock-crushing machine had erratic pressure problems, causing the crusher to stall when the pressure seemed to relieve at a …

Problem: Number of Cycles

“I plan to put an eight (8)-ft. elevator in my house using an air-over-oil system in case of power outages. My air compressor has a 75-gallon tank and kicks …

Overheating on a Large Forging Press

A forging and stamping company had problems with overheating on a press. The company had several identical presses, and only one had been overheating for some …

Problem: Cost of Air Leaks

We often hear that the cost of air in a manufacturing facility is approximately 40% of a utility bill.  Obviously this will vary considerably for different …

Cylinder Stuttering on a Technical School Trainer

A community technical school received funding for a hydraulics program. They had nice hands-on-training stands in storage and did a nice job setting up their …

Scrap Steel Winder Problem Slowing Down

Workers at a coil steel-processing mill received rolls of stainless steel from its parent company to slit in half and trim the edges approximately 1″ to …

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