Understanding Air Compressors – Part 2

Bits and Pieces: Fluid Power Fact #4/2 Understanding Air Compressors – Part 2  [Note: Part 1 of this article presents basics of air compressors. Part 2 presents the classification and the construction details of air compressors. Part 3 presents a brief about the sizing of air compressors.] Classification of compressors In a positive displacement compressor,... Continue Reading →

Hydraulic Fluid Contamination & its Control

Hydraulic fluids are subjected to various kinds of contamination. Contaminants can affect the physical and chemical properties of fluids. If the contaminants are not monitored or controlled, the fluid is likely to be subjected to various kinds of failures. These failures include the deterioration of the fluid properties and consequent fluid breakdown. At the system... Continue Reading →

Hydraulic Fluids – Functions, Characteristics, & Categories

Modern hydraulic applications demand compact machines designed with tighter tolerances and that run at faster cycle times. They are designed to work with small amounts of fluids. They operate at higher pressures, temperatures, and speeds. Under these circumstances, fluids are subjected to severe stresses. Hydraulic fluids must be carefully maintained throughout their service life. Three... Continue Reading →

How to Develop Multiple-actuator Pneumatic Circuits Using the Cascade Method?

Most of the practical pneumatic systems involve the use of multiple actuators (cylinders, semi-rotary actuators, etc) which when operating in specified sequences carry out the desired control tasks. Double-pilot directional control (DC) valves are used as final control elements to control the forward and return strokes of the actuators. Sensors are used for confirming the... Continue Reading →

Relay-based Electro-hydraulic Systems

[You may download this article at: https://fluidsys.org/downloads/ ] In the electrical actuation of a hydraulic valve, the necessary actuating force is obtained electrically with the help of a solenoid. The off-centre core of the solenoid coil is pulled towards the centre of the coil when the electric current is passed through it. This discrete movement of the... Continue Reading →

Pressure Control Valves in Hydraulic Systems

[You may download this article at: https://fluidsys.org/downloads/ ] The article looks at the basics of pressure control valves for educational use and is presented here to refresh your memory. Hope you are able to recall the functions, circuits, and applications of pressure control valves. Pressure control valves are used in hydraulic systems for obtaining pressure-related control functions.... Continue Reading →

Hydraulic Filters

The article explains the constructional features,  location-specific installation details, and performance specifications of hydraulic filters.  Introduction Modern high-pressure hydraulic systems with components built to closer tolerances are susceptible to many types of contamination. Contaminants can cause the premature wear of internal surfaces. They also promote leakage and clog the flow paths. Therefore, an efficient and... Continue Reading →

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