Fluid Power Journal

Drifting and Lurching Cylinder on Food-Processing Equipment

In the food and pharmaceutical processing industries, leaking actuators can contaminate products and increase waste, not to mention the possibility of …

Intake Filter in a Mansion Elevator

A well-known actor had a small elevator installed in his mansion that sits on top of a Tennessee mountain. He wanted it to lift two people up 20 feet to a …

Missing Rod Seal Back-up Ring

A casting company had a large heat treat furnace used in its process of making knuckles and suspension components for major automakers. These …

Overheating of Press with Heated Platen

Click on image to enlarge A small heated platen press for an aerospace parts manufacturer would close and hold pressure for 1 to 3 hours based on the part …

Steel Mill Accumulator

Years ago we built the complete hydraulic system for a continuous steel caster at a steel producer. The HPU had a 300-gallon reservoir with 6 pumps each driven …

Gear Pump Load Sense

A hydraulic distributor hired a sales engineer for a new territory they were moving into. The first customer the engineer visited requested a quote on a …

Aerated Oil on a Log Splitter

I loaned my log splitter to a friend whose tree fell after a storm. The tree was a blue spruce evergreen about 30-ft. tall. It surprised me that the tree’s …

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 …

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 …

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 …

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