Relay Controllers Vs PLC Controllers – An Insight into their Circuitry

The basic concepts of a relay control system and a PLC control system are highlighted in this article with the help of a circuit diagram. Assume that an electro-pneumatic system is used for obtaining an industrial work operation. The system consists of a pneumatic power part and an electrical control part. The electrical control part... Continue Reading →

Hydraulic Reservoirs

The article provides a concise account of the constructional details of hydraulic reservoirs. As you are aware, a hydraulic reservoir is an essential part of a hydraulic power pack.  Hydraulic Power Pack A hydraulic power pack transforms the power conveyed by its prime mover to hydraulic power at pressures and flow rates as required for... 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 →

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 →

Load Sensing Hydraulic Systems

[ You may download this article at: https://fluidsys.org/downloads/ ] A conventional hydraulic system with a fixed-displacement pump provides a constant flow through the system. When the system develops the set pressure, the pump flow is bypassed through the associated pressure relief valve. As a consequence, the system generates tremendous amount of heat. Even when a variable-displacement pump is... Continue Reading →

A Smart Narrative by a Hydraulic Maintenance Technician

Hi friends, I introduce myself as a 'hydraulic maintenance technician'. At this point, I stand in front of you to describe my work of maintaining hydraulic machinery and systems for my company. To simplify things, however, I restrict myself the scope of my description to the maintenance and troubleshooting tasks of just one hydraulically-operated machine.... Continue Reading →

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