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Questions and Answers
What is the name of the instrument shown in the figure on page 50?
What type of actuator converts pneumatic pressure into mechanical force to move the control valve?
What is the primary function of the diaphragm in a diaphragm-type actuator?
Which of the following components are involved in positioning the flapper over the nozzle in a pneumatic actuator?
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In a diaphragm-type actuator, how does the air pressure affect the valve stem?
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What is the primary function of a valve actuator?
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What is the name of the valve type that uses an electric motor as an actuator?
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What is the primary purpose of the relay in a pneumatic actuator?
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What is the function of the motor in a motor-operated valve?
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What is the purpose of the beam in a pneumatic actuator?
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What type of valve actuator uses electrical energy to attract a magnetic core?
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What is the role of the stem in a motor-operated valve?
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What is the primary function of the diaphragm in a diaphragm-type actuator?
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What is the purpose of the positioner in a pneumatic actuator?
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What type of actuator uses a motor-driven screw stem to move the valve?
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What is the role of the relay in a pneumatic actuator?
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The instrument shown on page 50 is a diaphragm-type actuator.
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The part labelled '1' on page 50 is called the 'spring'.
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The part labelled '3' on page 50 is known as the 'diaphragm'.
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The part labelled '5' on page 50 is called the 'stem'.
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The actuator shown on page 50 requires a pressure of 15 psi to set it to midpoint.
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In a diaphragm-type actuator, air pressure pushes the diaphragm up, compressing the spring and pushing the stem down.
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Solenoid actuators convert electrical energy into mechanical energy.
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A motor-operated valve (MOV) is a type of valve that uses a hydraulic actuator.
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Study Notes
Valve Actuators
- Valve actuators provide force to open, close, or adjust a valve.
- Four common types of valve actuators in Saudi Aramco:
- Electrical Motor Actuator
- Pneumatic Actuator
- Hydraulic Actuator
- Solenoid / Magnetic Actuator
Motor-Operated Valve (MOV)
- Uses an electric motor as an actuator.
- Consists of two main parts: valve itself and motor-driven screw stem.
- Motor uses two bevelled gears to move the stem up and down.
Pneumatic Actuator
- Converts pneumatic pressure into mechanical force to move the control valve.
- Diaphragm-type actuators use air pressure to overcome friction and process pressure to open and close a valve.
- Normally operates with a positioner.
- Positioner components:
- Beam
- Bellows
- Cam
- Relay uses back pressure created by the flapper and nozzle to send the right amount of air pressure to the actuator.
- Actuator moves the valve stem to open and close the valve.
Instrument Identification
- Instrument shown: Solenoid / Magnetic Actuator
- Parts labelled 1 to 7:
- Part 5: __________________
- Part 6: __________________
- Part 7: __________________
Pneumatic Actuator Operation
- Air pressure forces the diaphragm down, compresses the spring, and pushes the stem down to close the valve.
Valve Actuators
- Valve actuators provide force to open, close, or adjust a valve.
- Four common types of valve actuators in Saudi Aramco:
- Electrical Motor Actuator
- Pneumatic Actuator
- Hydraulic Actuator
- Solenoid / Magnetic Actuator
Motor-Operated Valve (MOV)
- Uses an electric motor as an actuator.
- Consists of two main parts: valve itself and motor-driven screw stem.
- Motor uses two bevelled gears to move the stem up and down.
Pneumatic Actuator
- Converts pneumatic pressure into mechanical force to move the control valve.
- Diaphragm-type actuators use air pressure to overcome friction and process pressure to open and close a valve.
- Normally operates with a positioner.
- Positioner components:
- Beam
- Bellows
- Cam
- Relay uses back pressure created by the flapper and nozzle to send the right amount of air pressure to the actuator.
- Actuator moves the valve stem to open and close the valve.
Instrument Identification
- Instrument shown: Solenoid / Magnetic Actuator
- Parts labelled 1 to 7:
- Part 5: __________________
- Part 6: __________________
- Part 7: __________________
Pneumatic Actuator Operation
- Air pressure forces the diaphragm down, compresses the spring, and pushes the stem down to close the valve.
Valve Actuators
- Valve actuators provide force to open, close, or adjust a valve.
- Four common types of valve actuators in Saudi Aramco:
- Electrical Motor Actuator
- Pneumatic Actuator
- Hydraulic Actuator
- Solenoid / Magnetic Actuator
Motor-Operated Valve (MOV)
- Uses an electric motor as an actuator.
- Consists of two main parts: valve itself and motor-driven screw stem.
- Motor uses two bevelled gears to move the stem up and down.
Pneumatic Actuator
- Converts pneumatic pressure into mechanical force to move the control valve.
- Diaphragm-type actuators use air pressure to overcome friction and process pressure to open and close a valve.
- Normally operates with a positioner.
- Positioner components:
- Beam
- Bellows
- Cam
- Relay uses back pressure created by the flapper and nozzle to send the right amount of air pressure to the actuator.
- Actuator moves the valve stem to open and close the valve.
Instrument Identification
- Instrument shown: Solenoid / Magnetic Actuator
- Parts labelled 1 to 7:
- Part 5: __________________
- Part 6: __________________
- Part 7: __________________
Pneumatic Actuator Operation
- Air pressure forces the diaphragm down, compresses the spring, and pushes the stem down to close the valve.
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Description
Learn about valve actuators, their types, and how they work, including electrical motor, pneumatic, hydraulic, and solenoid actuators, with a focus on motor-operated valves.
