Load Sensing Hydraulic Systems

FLUIDSYS TRAINING CENTRE

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 employed, the system produces considerable heat. A sophisticated solution to improve the efficiency is to add a load sensing feature to the system.

The hydraulic system with a load sensing feature provides only the flow and the pressure as required by the connected load. Controlling both the pressure and the flow allows for a significant reduction in losses, improvement of circuit efficiencies, and enhancement of the service life of the system. The principle of load sensing is widely used in mobile hydraulic systems, including tractor systems, trucks, and cranes. It is also…

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Typical Single Cylinder Pneumatic Circuits

This blog provides the following self-explanatory basic pneumatic circuits with only a single cylinder. Direct control of a single acting cylinder Indirect control of a single acting cylinder Speed control of a single acting cylinder Direct control of a double acting cylinder Indirect control of a double acting cylinder Speed control of a double acting... Continue Reading →

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

The basic concepts of the development of multiple actuators were discussed in the article ‘How to Develop Multiple-actuator Pneumatic Circuits Using the Cascade Method?’ published earlier. In this article, the Shift Register method is explained with the control task, as given below. Control Task A pneumatic circuit has to be developed using the shift register... Continue Reading →

TUV Rheinland Certified Qualification – Professional in Pneumatics and Hydraulics – Advanced Level

Fluidsys Training Centre Pvt Ltd Bangalore, India 2019-20 Fluidsys Training Centre, Bangalore offers an advanced-level course in the field of Pneumatics and Hydraulics. The systematic training offered by the training centre is mainly intended for Degree/Diploma holders in the Mechanical, Electrical, Electronics, and Computer Science branches. After successful completion of the training, participants will be... Continue Reading →

Hydraulic Filters

FLUIDSYS TRAINING CENTRE

[You may download this article at: https://fluidsys.org/downloads/ ]

The article explores the topic of hydraulic filters for educational use and is presented here to refresh your memory. Hope you are able to recall the constructional features, performance specifications, and location-based installation details of hydraulic filters quickly. Let us get down to the nitty-gritty 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 correctly-sized filtration system should be an integral part of every hydraulic system to separate the particulate matter of a specified size or greater from the system fluid. They should be fitted at appropriate locations in the hydraulic circuit for the effective control of contamination.

Strainers and Filters

A filtration unit, such as a…

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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 →

Understanding Air Compressors – Part 3

Bits and Pieces: Fluid Power Fact #4/3 Understanding Air Compressors – Part 3  [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.] Sizing Air Compressors Sizing an air compressor for... Continue Reading →

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 →

Know the Difference between Gauge Pressure and Absolute Pressure

Bits and Pieces: Fluid Power Fact #3 Know the Difference between Gauge Pressure and Absolute Pressure Two pressure scales are utilized to measure pressure values in fluid power systems: a gauge scale and an absolute scale. The gauge pressure is the pressure indicated by a pressure gauge. It is a measure of the pressure with... Continue Reading →

What is the Most Economical Pressure in Pneumatics?

Bits and Pieces - Fluid Power Fact #1: What is the Most Economical Pressure in Pneumatics? Pneumatic systems have been developed and progressed comparatively as a low-pressure system. Pneumatic air consuming devices such as cylinders and rotary actuators are designed for the maximum operating pressure of 8 to 10 bar [115 to 145 psi]. However,... 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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