#FREE HYDRAULIC CIRCUIT DESIGN SOFTWARE FULL#

However during the retraction stroke, fluid pressure bears on the smaller annular area ( A P A R ). Similarly during the extension stroke, fluid pressure bears on the entire area of the piston( A P ). Since A P = is grreater than ( A P A R ), the retraction velocity is greater than the extension velocity since the pump flow rate is constant. However during the retraction stroke, fluid enters the rod end through the smaller annular area between the rod and cylinder bore ( A P A R ), where A P = piston area, and A R = rod area. During the extension stroke, fluid enters the blank end ( A ) of the cylinder through the entire circular area of the piston ( A P ). A B Fig 5.3 Double acting cylinderģ he output force ( F ) and piston velocity of double acting cylinder are not the same for extension and retraction strokes. hus, an output force can be applied in two directions. C = Single acting cylinder P = Pump E = Electric Motor = ank F = Filter R = Relief Valve D =2-position, 3 way DCV Manually operated and spring return 5.2 Control of Double -Acting Hydraulic Cylinder : Double Acting cylinders can be extended and retracted hydraulically. Control of Single -Acting Hydraulic Cylinder. Deactivation of the DCV allows the cylinder to retract as the DCV shift into its spring offset mode.Ģ C A 1 0 D P E P R F Fig 5.2.

#FREE HYDRAULIC CIRCUIT DESIGN SOFTWARE FULL#

At full extension, pump flow goes through the relief valve.

When the valve is manually actuated the pump flow goes to the cylinder blank end A via DCV 1 position. he spring in the rod end of the cylinder retracts the piston as oil from the blank end A drains back to the rank. In the spring offset mode, full pump flow goes the tank via the pressure relief valve. A Fig 5.1 Symbol Force during extension stroke is, F ext = p * A P Velocity during extension stroke is, v P ext = Q P / A P he force and velocity during retraction stroke depends upon spring rate as single acting cylinder do not retract hydraulically Figure 5.2 shows a two- postion, three way, manually operated, spring offset directional control valve ( DCV ) used to control the operation of a single acting cylinder. Retraction is accomplished by using gravity or by the inclusion of a compression spring in the rod end. Single- acting cylinder do not retract hydraulically. 5.1 Control of a Single- Acting Hydraulic Cylinder : A single-acting cylinder can exert a force in only the extending direction as fluid from the pump enters the blank end of the cylinder ( usually left side of the piston). he symbols have to conform to the ANSI specification. Hydraulic circuits are developed through the use of graphical symbols for all components. Efficiency of operation It is very important for the fluid power ( Hydraulics and Pneumatics ) designer to have a working knowledge of components and how they operate in a circuit. When analyzing or designing a hydraulic circuit, the following three important considerations must be taken into account: 1. 1 HYDRAULIC CIRCUI DESIGN AND ANALYSIS A Hydraulic circuit is a group of components such as pumps, actuators, and control valves so arranged that they will perform a useful task.

Free hydraulic circuit design software