Fluid power circuits and controls: fundamentals and by John S. Cundiff

By John S. Cundiff

Engineers not just have to comprehend the fundamentals of the way fluid energy elements paintings, yet they need to even be capable of layout those elements into platforms and study or version fluid strength structures and circuits. There has lengthy been a necessity for a entire textual content on fluid strength platforms, written from an engineering point of view, that's appropriate for an undergraduate-level direction in fluid power.Fluid strength Circuits and Controls: basics and functions encourages scholars to consider the gathering of elements as a process. the writer illustrates each one notion with a circuit diagram, and as each one part is mentioned, instantly locations it in a circuit and analyzes its functionality. This strategy permits scholars to right away practice what they've got discovered and encourages them to contemplate how the part working features engage with the remainder of the circuit.Covering all points of the undefined, this book:oDevelops the fundamental thought for strength supply with fluidsoReviews uncomplicated techniques of fluid mechanics and discusses the major houses of the fluidsoDiscusses the production and keep an eye on of move and some of the equipment used to regulate strain in a circuitoProvides a close instance of the vintage challenge of hydrostatic transmission designoPresents features of auxiliary elements and acceptable SAE standardsoAddresses pneumatics, targeting the adaptation in strength transmission for liquid and gasoDiscusses servo valves and proportional valves with no requiring a historical past in automated controlsThe textual content is richly illustrated, full of totally labored instance difficulties, and strengthened with routines in every one bankruptcy. Fluid strength Circuits and Controls bargains worthwhile layout event and the history its readers have to technique real-world fluid energy issues of self assurance.

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Example text

Pneumatic systems use air as the working fluid. The air does not have to be purchased, and it can be exhausted back to the atmosphere after use, thus avoiding the expense of a return line. A discussion of pneumatic systems is presented in Chapter 10. The function of the fluid is to 0924Ch02 Page 25 Wednesday, May 16, 2001 4:20 PM Fluid Power Basics 25 1. Transmit power 2. Provide lubrication 3. Provide cooling 4. Seal clearances To provide lubrication and seal clearances between moving parts, the fluid must be able to establish and maintain a continuous film between the parts.

Keep sources of oxygen (air and water) out of the system. 2. Remove particulates with a good filtration system. These particulates can act as sites for the oxidation reaction to occur. 3. Avoid the use of cadmium, zinc, and copper in contact with hydraulic oil. For example, never use galvanized pipe or fittings. These metals can act as catalysts that promote the oxidation reaction. There is a phenomenon that can occur in a fluid power system that is not intuitive but can cause significant change in the oil chemical properties.

Provide cooling 4. Seal clearances To provide lubrication and seal clearances between moving parts, the fluid must be able to establish and maintain a continuous film between the parts. High pressures and high relative velocities affect the establishment and maintenance of the film. The design of pumps and motors involves a detailed analysis of the fluid film between the moving parts. Maximum operating speed is set by the ability of the design to maintain a minimum film thickness. Properties of the fluid become more critical as operating pressure and operating speed increase.

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