Off-line filtration, whether permanently installed on a hydraulic system, or effected by the temporary installation of a portable filter cart, is a powerful bazooka in the contamination control effort.

Without interfering with the operation of the equipment, the oil can be kept clean, in the former case, with full-time, offline filtration. Or, the oil can be flushed periodically with a … Read more

Specific heat is a numeric value which refers to the amount of heat required to raise a set quantity of a substance by a fixed temperature. For example, pure water has a specific heat of 1. This means one calorie will raise the temperature of one gram of water by one degree C. Or, in U.S. units, one BTU will … Read more

Why do hydraulic spool valves sometimes stick? In a word: contamination. The radial clearance between the spool and bore in common, garden-variety directional control valves ranges between 3 and 13 microns. And in practice, perfectly round and straight bores are difficult to achieve. This is why servo and servo-proportional valves are fitted with a sleeve between the spool and bore-for … Read more