present lab

7/27/2019 Present Lab

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A hydraulic pump is a mechanical device that convertsmechanical power to hydraulic energy.

It performs two functions;

-Its mechanical action creates vacuum at pump inlet

-The mechanical action creates vacuum at pump inlet

The pump does not generate pressure and only produceliquid movement.



To operate pressure compensated vane pump

To investigate time required to fill with different

pressure.

To learn about the concept of hydraulic powertransmission

To show the relationship between flow rate Q,pressure P, of pressure compensated vane pump



The oil flow rate in measuring glass can be calculatedby using;

Q= v/t

Where; Q= Vd x N

The hydraulic power transmission between pump andmotor can be

calculated by;

P = p x Q Hydraulic power transmission = Pp x Pp = Pm x Pm

where;

Qp = Qm = system flow rate



1) Assemble the circuit correctly and make sure that the connectingnose fit properly

2) Use the flow control valve, v1 as a load simulator. It will simulate theloading condition

3) For part A of the experiment, close shuttle v2, v5 and open shuttlevalve v4 and v6. The flow control v1 is set to fully open.

4) Switch on the pump

5) Set the system pressure for 15 bars by turning the knob of the flowcontrol valve v1 to close

6) Close the shut off valve v6 below the measuring glass. Record the

time required to fill in about one liter of oil in the measuring glass.



7) Switch of the pump. Open shuttle v6 to drain out the oil from the

measuring glass

8) Repeat steps 4 to 6 for higher pressure. Record any pressure

increase in the system by using pressure gage P1.

9) The pressure gage P1 will show a maximum pressure of the

hydraulic system. Record the maximum pressure

10) Switch off the pump and prepare the report.



1) Assemble the circuit correctly and make sure that the connectinghose fit properly

2) Use flow control valve, V1 as the speed controller for hydraulicmotor. It must be set fully open for hydraulic motor maximum

rotational speed.

3) Close shuttle v4, v6 and open shuttle valve v2 and v5.

4) Switch on the pump. The hydraulic motor should start to rotate.

5) Set the pressure gage p1 for 15 bar by turning the knob of thepressure relief valve v1.



FLOW RATE AGAINST

PRESSURE



GRAPH OF PUMP

PERFORMANCE



As the pressure increases, the time taken to fill the cylinder is shorter

and the flow rate is increasing.

As the pressure increases, the power of the pump is increasing.

There are some different in the graph line’s pattern and do not follows the

expected pattern before.

This is due to the apparatus error. For instance, during pump

performance curve experiment, it took the longest time to fill the oil in

the cylinder for pressure 50 bars. Supposedly, as the pressure increases,the time taken should be shorter.

Besides, the pump stop working as the pressure is set to 50 bars. Hence,

the measurement could not be conducted and stopped at 45 bars.

Other errors are human error and parallax error while conducting the

experiment.



The objective of the experiment is achievedwhich are

-to operate pressure compensated valve.

-to investigate time required to fill the tankwith different pressure.

-to learn about the concept of hydraulicpower transmission.

-to show the relationship between flow rateand pressure ofcompensated vane pump.

The graph of pump performance curve is

slightly different due to some errors whichare parallax error human error and

present lab

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