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Fluid power test 3

QuestionAnswer
limited rotation motors provide output motion over a finite angle
limited rotation actuator 1. rotary output over a finite angle 2. high instantaneous torque 3. torque capacity
hydraulic motors def can rotate continuously and have same basic configuration as pumps
hydraulic motor examples gear motor, vane motor, piston motors (inline/axial)
_____ requires _____ torque than it theoretically should pump, greater
______ outputs _____ torque than it theoretically should, due to frictional losses motor, less
hydraulic transmission system consisting of hydraulic pump, hydraulic motor, and valves & pipes must have prime mover like an electric motor
hydraulic transmission advantages 1. infinitley variable speed and torque 2. bi directional 3. high hp to weight ratio 4. can stall without damage 5. low inertia of rotating members 6. flexibility & simplicity of design
valves mechanical devices that control flow in any gas or liquid system
valve primary control functions 1. start, stop, and direct flow 2. regulate or throttle flow 3. prevent backflow 4. regulate pressure 5. prevent excessive pressure
valve elements (3) movable elements to obstruct or open flow Ball, poppet, spool
Directional control valves provide the means by which fluid energy is transmitted to various parts of the system
DCV functions (7) 1. Activate or close a circuit 2. reverse direction of flow 3. isolate circuit branches 4. divert or divide flow 5. deactivate a circuit 6. combine flow streams 7. redirect flow from 1 branch to other branches
Valve symbols (3) basic building blocks for preparing circuit drawings pictorial, cutaway, graphical
DCV widely used descriptive terms way, position, port
DCV symbol letter P pump or pressure port
DCV symbol letter T tank or reservoir port
DCV symbol letter x/y pilot pressure ports
DCV symbol letter V vent port
DCV symbol letter D drain port
DCV symbol letter A/B actuators, work, or motor ports
Created by: user-1742075
 

 



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