mechanical engineering lab.doc

8/11/2019 Mechanical Engineering Lab.doc

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Alexandria University

Faculty of Engineering

Mechanical Engineering Department

Hydraulics Lab ( thyear !

Mechanical Engineering Lab

Hydraulics

4thYear


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Components of the circuit :

"#Atmospheric $eservoir

%-Fixed Displacement &ump

'-&ressure auge-&ressure $elief )alve

*-)ariable .hrottle )alve

Describtion of the circuit :

/tudy the performance of a direct-acting pressure relief valve by

close the throttle valve completely then 0 unload the pressure

relief valve 1 /et the pressure relief valve approximately to *2bar then 0 open the throttle valve completely 1 close the throttle

valve in several steps 0 measure and note do+n the system

pressure and the flo+ rate through the pressure relief valve 1


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Normal Circuits


"#Atmospheric $eservoir

%#Fixed Displacement &ump

'#&ressure $elief )alve

#3%-4ay 56 - Lever +ith /pring $eturn*-Double-Acting 7ylinder +ith ad8ustable 7ushion

,#Filter


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Regeneratie Circuit

Describtion of the circuit :

/tudy the behavior of a regenerative circuit and to compare it

+ith that of a normal circuit by using the 3% D7) as a '3% D7)

(by plugging one of its ports! 0 extend the double-acting cylinderand notice the extension speed and the pressure upstream and

do+nstream the cylinder 1 Using the 3% D7) normally 0 extend

the double-acting cylinder and notice the extension speed and

the pressures upstream and do+nstream the cylinder1


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Extension

.ime

& do+nstream

(bar!

& upstream

(bar!

%1*2*9*9$egenerative

circuit

%1:;2*95ormal circuit

E!tension time :

. regenerative < . normal

"orce :For regenerative circuit =

& > Ac ? F @ & ( Ac # Ar !

F ? & > Ac # & ( Ac # Ar !

F ? & > Ar

For normal circuit =

F ? & > Ac

Ac Ar

F regenerative < F normal


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Circuit #


"#7ompressor

%#Accumulator

'#Filter

#&ressure $egulator

*#'3%-4ay 57 - El1 7ontrol0 &ush Button +ith /pring $eturn

,#&ilot Line

;#/ilencer:#*3%-4ay 57 # &ilot 6perated

9#Double-Acting %-7ushion 7ylinder


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Circuit $


" # 7ompressor

% # Accumulator

' # Filter

# &ressure $egulator

* # '3%-4ay 57 - El1 7ontrol0 &ush Button +ith /pring $eturn

, # *3%-4ay 57 # &ilot 6perated; # /ilencer

: # )ariable 5on $eturn .hrottle )alve

9 # &ilot Line

"2 # Mechanical &osition /ensor

"" # Double-Acting %-7ushion 7ylinder


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Number%ectionName*"9""Mar+an Mohamed /haaban Abou Chashaba

*'%""Mostafa /haaban Mahmoud Hal+ag

;:%Ahmed Fa+i Al /oliman

'%*;Amr Adel Abdel-aal Elsayed Hal+ag

*%9""Mostafa Elsayed Mohamed Elsayed

*'9""Mostafa Mahgoub Ahmed Hassan

mechanical engineering lab.doc

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