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Control Valve Training Overview

This document provides an overview of control valves, including: - Defining control valves and listing common types such as ball, globe, pinch, plug, and butterfly valves. - Describing control valve internal components like the valve body, bonnet, and packing box. - Discussing common control valve actuators and accessories, including pneumatic, electric, and hydraulic actuators, solenoid valves, pressure regulators, and positioners. - Explaining problems that can impact control valves like cavitation and flashing, which can cause erosion damage inside the valve.

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Riyadh Daoudi
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261 views21 pages

Control Valve Training Overview

This document provides an overview of control valves, including: - Defining control valves and listing common types such as ball, globe, pinch, plug, and butterfly valves. - Describing control valve internal components like the valve body, bonnet, and packing box. - Discussing common control valve actuators and accessories, including pneumatic, electric, and hydraulic actuators, solenoid valves, pressure regulators, and positioners. - Explaining problems that can impact control valves like cavitation and flashing, which can cause erosion damage inside the valve.

Uploaded by

Riyadh Daoudi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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YANBU ARAMCO SINOPEC REFINING COMPANY

(YASREF) Ltd.

Control Valves
Mohamed Ibrahim

Training & Development


Objectives
• By the end of this training you should :-

- - Define control valve .


- - Be aware about control valve types.
- - Be aware about control valve internal
components.
- - know control valve accessories.
- - Be aware about the problems that impact
control valve.
About Instrumentation
control valve is simply a variable orifice that is used to regulate the flow
of a process fluid according to the requirements of the process.
CONTROL VALVES TYPES
Control valves types
Ball Valve Globe Valve pinch Valve
Plug Valve

Butterfly Valve Gate Valve Diaphragm Valve Needle Valve


Air to open Air to close
Valve Body Assembly
Valve Body Assembly – Components Names
• Video & Coffee break ???
• Valve Bonnet

Extension Bonnet Extension Bonnet: A bonnet with greater


dimension between the packing box and
bonnet flange for hot or cold service.
Control Valve Actuators & Accessories

Control valve actuators translate a control signal (normally 3-to-15 psi or


4-to-20 mA) into the large force or torque that is needed to manipulate a
valve.

Three common types of actuators used :


1- pneumatic actuators (Diaphragms & Pistons).
2- Electric actuators.
3- Hydraulic actuators

Hydraulic Actuator
Diaphragm Actuator

Electrical Actuator Piston Actuator


SOLENOID VALVE

• Solenoid Valve is electrical actuated valve categorized to three types:

• 1- Direct acting .
• 2- Manual reset .
• 3- Pilot operated .

Manual Reset

Pilot operated solenoid used to switch the flow of air

Direct acting simple ON/OFF Operation


Pressure regulators

A pressure regulator is an adjustable valve


that is designed to automatically control the
pressure downstream of the regulator.
Positioners
A positioner is a device used to ensure positive
position of a valve or damper actuator.
All positioners have a feedback link from
the valve shaft, providing accurate valve
position information. Positioners can work
with linear or rotary actuation and can be
used to increase the actuation power

Linear positioner

Rotary positioner
Cavitation is a condition that occurs in liquid flow where the internal pressure of the liquid at some
point falls below the vapor pressure and vapor bubbles form and at some other point downstream
rises above the vapor pressure again. As this pressure recovers so that the bubbles collapse, and
cavitation takes place.
Flashing is a condition that occurs with liquid flow where the pressure falls below the vapor
pressure and remains below it. There are then two phases flowing (i.e. liquid and vapor) downstream.
Severe damage can occur inside a valve due to erosion caused by the impact of liquid droplets traveling
at high speeds
QUESTIONS

Any Questions???

Thanks???

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