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Hydraulic Equipment - Coggle Diagram
Hydraulic
Equipment
Actuator
Hydraulic Cylinder
Single Acting Cylinder (Type)
motion control in one single direction (forward stroke)
return stroke by gravity or spring
saving power
2-types
piston type
ram type
(ram type does not have piston rod)
apply on one side of piston
Double Acting Cylinder (Type)
motion control in both forward & return stroke
apply on both side of piston
2-types
single-rod type
double-rod type
Oscillating Hydraulic Actuator
rotate shaft within a predetermined angle range
applications
valve switching device
conveyor turn device
load elevating equip.
rolling equip.
intermittent feeding equip.
3-types
one-vane type
two-vane type
three-van type
oscillating angle ranges depending on num. of vane (60 to 280 degrees)
relatively compact
less cost expensive
Hydraulic Motor
3-types
Piston Motor
Axial type
complicated structure
expensive cost
high efficiency
significant power output
Radial type
switching oil inlet & outlet for reverses rotation direction
suitable for
low-speed high-torque
Vane Motor
suitable for
mid-speed mid-torque motor
every vane projected before running motor
Gear Motor
suitable for
high-speed low-torque motor
have external drain
shaft continuously rotate
mechanism similar hydraulic pump but different structure
easy control (revolving speed & revolution direction)
small size & weight
high output power
application
fixed displacement motor frequently used more than variable displacement motor
Hydraulic Pump
2-type by discharge rate
Fixed Displacement Pump
Variable Displacement Pump
3-types by structure
Gear pump
2-types
Internal gear pump
same EGP
crescent-shaped partition plate
External gear pump
two gear engage
suck oil by empty space
simple structure
compact size
no have Variable displacement
highest suction capacity
Vane pump
2-types
Balanced vane pump
centrifugal force
the hydraulic oil pressure acting on the perimeter of the motor is in balance
volume exchange
Unbalanced vane pump
long life
stable performance for long periods
low pulsation & noise
easy maintain
Piston pump
2-types
Radial piston pump
(rotating cylinder/
fixed valve type)
pistons run on the inner surface of the eccentric ring
piston outward, oil enters
pistons inward, oil discharged
Axial piston pump
(bent axis type)
can add
Various control options
2-types
bent axis type
adjust angle of inclination between cylinder block and the shaft for changing flow rate
cylinder block rotate when the shaft rotate
swash plate type
variable displacement
adjust discharge rate adjustment screw for changing discharge rate
adjust pressure adjustment screw for changing maximum pressure
suitable for high pressure
highest pump efficiency
complicated structure
sensitive oil contamination
lowest sucion capacity
producing fluid power (pressure and flow rate)
receiving mechanical power
constant discharge rate when varying load fluctuates
Pressure Control Valve
4-types
Relief valve
2-types
Direct operated relief valve
pressure control spring controlling pressure oil for oil flow
low-flow application
the range between set pressure & cracking pressure (override pressure) is more than
Pilot-operated relief valve
the range between set pressure & cracking pressure (override pressure) is less than
pressure balancing structure
remotely controlled by vent port
2-step flow rate
Pressure reducing valve
(pilot-operated pressure reducing valve w/ check valve)
clamping application
Sequence valve
Conunter balance valve
limit the maximum pressure of main circuit
reduce & regulate pressure
switch the connection (line) when pressure reached the set value
Chock
long relatively comparison
Flow Control Valve
2-types
One-way throttle valve
simple structure
flow rate varies as the load pressure change
flow rate not shut down to zero
Pressure compensated flow control valve (w/ check valve)
mechanism compensated constant pressure
flow rate remain constant even when load pressure varies
control flow rate
controlled motion speed of actuator
Orifice
short relatively comparison
Directional Control Valve
3-types
Check value
2-types
In-line check valve
Angle check valve
control flow in one direction
spring depends on application
more 0.05MPa
check valve
less 0.045MPa
resistance valve
Pilot-operated check valve
keep cylinder in position for long time
back flow w/ pilot pressure
Directional control valve
4-port valve mostly used
2/3 position valve
2 pos: forward/backward
3pos.: neutral stop pos.
spool type
return type
spring center
no spring
spring offset
Solenoid-operated valve
operated by electric signals
emergency shutoff
cartridge filled w/ oil
spool operation type
depends on operation method
Solenoid-controlled pilot-operated valve
limited flow rate capacity
electromagnetic force
hydrodynamic shock
high-flow application
shockless effect in switching operation
open/close operation
starting/stopping actuator
converting motion direction
block back flow