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Blueprint Reading
Published in Frank R. Spellman, The Science of Wind Power, 2022
A valve is defined as any device by which the flow of fluid may be started, stopped, or regulated by a movable part that opens or obstructs passage. As applied in fluid power systems, valves are used for controlling the flow, the pressure, and the direction of the fluid flow through a piping system. The fluid may be a liquid, a gas, or some loose material in bulk (like a biosolids slurry). Designs of valves vary, but all valves have two features in common: A passageway through which fluid can flowSome kind of movable (usually machined) part that opens and closes the passageway
Fuses and Relay Circuits
Published in Dorin O. Neacşu, Automotive Power Systems, 2020
Fluid power deals with the use of fluids under pressure to generate, control, and transmit power. Fluid power is also known as hydraulics when a liquid such as mineral oil or water is used, and pneumatics when a gas such as air is used. Compressed-air and water-pressure systems are the most known systems for fluid power.
Water/Wastewater Conveyance
Published in Frank R. Spellman, Handbook of Water and Wastewater Treatment Plant Operations, 2020
Any water or wastewater operation will have many valves that require attention. Simply as a matter of routine, a maintenance operator must be able to identify and locate different valves in order to inspect them, to adjust them, and to repair or replace them. For this reason, the operator should be familiar with all valves, especially those that are vital parts of a piping system. A valve is defined as any device by which the flow of fluid may be started, stopped, or regulated by a movable part that opens or obstructs passage. As applied in fluid power systems, valves are used for controlling the flow, the pressure, and the direction of the fluid flow through a piping system. The fluid may be a liquid, a gas, or some loose material in bulk (like a biosolids slurry). Designs of valves vary, but all valves have two features in common: a passageway through which fluid can flow and some kind of movable (usually machined) part that opens and closes the passageway (Globe Valves, 1998).
Motion synchronization for the SHA/EMA hybrid actuation system by using an optimization algorithm
Published in Automatika, 2021
Waheed Ur Rehman, Xinhua Wang, Yiqi Cheng, Hui Chai, Zeeshan Hameed, Xingjian Wang, Farrukh Saleem, Ehtisham Lodhi
The opening of a servo valve is a function of input command signal and supply pressure, and this relationship is given by where is the servo valve displacement, is the input voltage to the servo valve and is the supplied pressure. The influence of supply is neglected. So, the relation between input voltage and displacement is given by [15] Fluid power is controlled and modulated by the hydraulic servo valve. The flow through the valve is given by Flow is linear near null opening and null load points [28], leading to the following form of the flow. where is the flow/opening gain before null pressure drop, is the flow/pressure gain and is the load pressure.