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Pressure-transducer options for fluid-power measurements
Applying pressure to a coupled port in a Wheatstone bridge increases resistance in two resistors and decreases it in the other two. An excitation source drives the bridge, and output is measured as a differential voltage. In fluid-power systems, users often need to know the operating pressure
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Properties and Principles of Fluid Power
minimizes loss of pressure and flow which are critical to work device operation.back. FLOW RATE. Volume or rate of a fluid passing through a conductor per unit of time. For pneumatic systems, flow rate is most often expressed as standard cubic feet per minute (SCFM) or normal liters per minute (nL
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Definitions and Explanations
, some lacquer coatings, in gasoline, in engine cleaners, in styrenic plastics, phenolic resins, creosol preservatives, and some pesticides. Oils: describes a variety of greasy fluid substances that are typically viscous liquids at room temperature, less dense than water, insoluble in water
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SPEED LIMITS: Relating flow velocity to hydraulic performance
. Larger relief valves may take 60 to 100 msec. During that short time the pump continues to discharge fluid, and that flow must be absorbed by fluid conductors, valves, actuators, and other components. System pressure rises because pressure controls do not anticipate but respond to the additional
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Level sensors go floatless
elements periodic along the direction of propagation of the wave. Most SEF sensors use a flat conductor in a serpentine pattern. But the shape can also be a helix, radial spiral, or other configurations when the sensors measure other properties besides fluid level. An additional screen conductor
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Dispelling myths of valve selection
Most pneumatic system designers are familiar with the flow coefficient as a means of gauging flow through various fluid-power components. Unfortunately, there is a common misconception in the industrial community that doubling a valve's flow coefficient, or conductance, , cuts actuator stroke time
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Mercury-free switches
contacts. The usual technique has a metal ball either making or breaking a connection between two metal conductors when the switch tilts. The ball generally rolls off the case and onto the contacts to make the connection. A viscous dielectric fluid sealed in the case is specified so ball movement mimics
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Sensor Sense: Magnetic inductive flowmeters
of voltage generated is directly proportional to the speed of the fluid flow. Speed of flow combined with the pipe diameter determines rate of flow. It’s important to note that the fluid must be electrically conductive. Just as copper is a better conductor than iron, some fluids conduct better than others