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ACTUATORS
Ranjana N
6th sem
Introduction
• Actuator is a transducer that translates the control
signal from one form of energy into another form.
• During valve operation, the translational motion is
transformed into rotary motion.
• It produces an output position that is proportional to
its input signal.
Types of Actuators
Following are the types of Actuators classified based
on their functions:
• Pneumatic Actuators
• Electro pneumatic Actuators
• Hydraulic Actuators
• Electro hydraulic Actuators
• Electric Actuators
Pneumatic Actuators
OMost commonly used process control
actuators.
OIt is also called as a Spring Actuator.
OThe controlled input-air pressure
provides sufficient force on the
diaphragm to offset a portion of the
spring force.
Pneumatic Actuator
O Increase in controlled
input-air pressure
moves the valve plug in
downward direction,
reducing the flow
through the valve. This
action is termed as Air-
to-close. If the actuator
inlet port is below the
diaphragm then it is
termed as Air-to-open.
Electro pneumatic Actuators
• It is a combination of a
current to pressure
transducer, a feedback
positioner and a
pneumatic spring
diaphragm actuator.
• It is used to handle
pulse signals from a
digital computer
controller.
Hydraulic Actuators
 It is usually present in
the form of hydraulic
piston.
 The piston is moved by
applying pressurized
hydraulic fluid to either
side of the piston with
an opposing spring
providing for the
motion in the other
direction.
Electro Hydraulic Actuators
• It consists of an electric-
to-hydraulic transducer,
a feedback positioner
and a hydraulic piston.
• It is similar to that of
pneumatic piston
actuator; both need
some means of piston
position feedback.
Electric Actuators
• Two types: electric
motor and electrical
solenoid.
• Used for two-position
actuators provided with
a forward and reverse
winding.
Actuators

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Actuators

  • 2. Introduction • Actuator is a transducer that translates the control signal from one form of energy into another form. • During valve operation, the translational motion is transformed into rotary motion. • It produces an output position that is proportional to its input signal.
  • 3. Types of Actuators Following are the types of Actuators classified based on their functions: • Pneumatic Actuators • Electro pneumatic Actuators • Hydraulic Actuators • Electro hydraulic Actuators • Electric Actuators
  • 4. Pneumatic Actuators OMost commonly used process control actuators. OIt is also called as a Spring Actuator. OThe controlled input-air pressure provides sufficient force on the diaphragm to offset a portion of the spring force.
  • 5. Pneumatic Actuator O Increase in controlled input-air pressure moves the valve plug in downward direction, reducing the flow through the valve. This action is termed as Air- to-close. If the actuator inlet port is below the diaphragm then it is termed as Air-to-open.
  • 6. Electro pneumatic Actuators • It is a combination of a current to pressure transducer, a feedback positioner and a pneumatic spring diaphragm actuator. • It is used to handle pulse signals from a digital computer controller.
  • 7. Hydraulic Actuators  It is usually present in the form of hydraulic piston.  The piston is moved by applying pressurized hydraulic fluid to either side of the piston with an opposing spring providing for the motion in the other direction.
  • 8. Electro Hydraulic Actuators • It consists of an electric- to-hydraulic transducer, a feedback positioner and a hydraulic piston. • It is similar to that of pneumatic piston actuator; both need some means of piston position feedback.
  • 9. Electric Actuators • Two types: electric motor and electrical solenoid. • Used for two-position actuators provided with a forward and reverse winding.