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The Control Of Pneumatic Power
DIRECTIONALCONTROL VALVE
AIR CLEANINGEQUIPMENT
OTHEREQUIPMENT
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Function
Controlling fluid Power(pneumatic or hydroulic) :
Pressure
Concern on the maximum system operating
pressure,Pressure sensing device that control
the direction or volume of the fluid
Direction
Volume of fluid flow
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1.Pressure Regulator
To keep theoperating systempressure arevirtually constant
Type : piston ordiaphragma
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2.Directional Controll Valve
The function are to direct fluid power (air pressure or
hydroulic oil) tovarious place in the system
The main sub clasification as :
1.Number of flow port (two-way valve,three-way valve, four-
way valve , five -way valve)
2.Number of position (two-switching position, three
switching
position )
3. Construction of the actuator (popet type, longitudinal
spool
type, rotary disc type)
Each valve may be operated : manually,
mechanically, electrically, or by pilot
arrangement
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Operating Actuator of direcional control valve
Secara
umum
Tombol Tekan
(Push Button)
Tuas (Lever)
Pedal / injakan
Plunger
Pegas
(Spring)
Rol (Rooler)
Rol tuas dengan
kembali bebas
Memakai tekanan udara dari satu arah
Memakai tekanan udara dari dua arah secarabergantian
Dua buah solenoid (double solenoid) secara
bergantian
Sebuah solenoid (single solenoid)
Manual operated
Electrical operated
Pilot arrangementoperated
Mechanical
operated
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Katup 3/2-waydigerakkan oleh tombol tekan (PB) atau secara
manual dan kembali ke posisi awal karena spring return(pegas
pengembali)
Katup 3/2-waydigerakkan secara mekanik sebagai Limit Switch
(LS) model biasa dan kembali ke posisi awal karena spring
return(pegas pengembali)
Katup 3/2-waydigerakkan secara mekanik sebagai Limit Switch
(LS) model rol tuas kembali bebas (idle return) dan kembali
ke
posisi awal karena spring return
Katup 5/2-waydigerakkan/dikontrol oleh udara bertekan-
an (secara pneumatik) dari satu arah dan kembali ke posisi
awal(normal) karena spring return.
Biasa disebut Monostable Distributor
Katup 5/2-waydigerakkan/dikontrol oleh udara bertekan-
an (secara pneumatik) dari dua arah secara bergantian.
Biasa disebut Bistable Distributor
Katup 5/2-waydigerakkan/dikontrol secara elektrikdari satu arah
dan kembali ke posisi awal (normal) karena spring
return.
Biasa disebut Monostable Electric Distributor
Katup 5/2-waydigerakkan/dikontrol secara elektrik
dari dua arah secara bergantian.
Biasa disebut Bistable Electric Distributor
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Circuit diagram pneumatic
element
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Combination valve -Time dellay valve
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Speed control on actuating
cylinder The speed of cylinder can be
controlled inthe following way :
1. Meter the air flow INTO the cylinder
(metering in)2. Meter the air flow OUT out of the
cylinder (metering out)
3. Meter both the flow IN and the flowOUT the cylinder
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Cause of Failure of Pneumatic
valve
1. Dirt , this is the major cause for valve failure
2. Lack of lubrication, most of pneumatic
valve requred lubrication
3. Heat , this cause deterioration of mostpacking
4. Broken part 5. Incorrect Packing
