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Control Valves
DEFENITION
THE CONTROL VALE IS THE EARLIEST KNOWN FINALCONTROL ELEMENT WHICH DOES
EITHER OF THE FOLLOWING THREE
FUNCTIONS:
1. DISPENSING APPLICATION
(REGULATE FLOW)
2. DISSIPATING APPLICATION
(PRESSURE LET DOWN)
3. DISTRIBUTING APPLICATION
(DIVIDE PROCESS FLOW)
Control Valves
DEFENITION
THE CONTROL VALE IS THE EARLIEST KNOWN FINALCONTROL ELEMENT WHICH DOES
EITHER OF THE FOLLOWING THREE
FUNCTIONS:
1. DISPENSING APPLICATION
(REGULATE FLOW)
2. DISSIPATING APPLICATION
(PRESSURE LET DOWN)
3. DISTRIBUTING APPLICATION
(DIVIDE PROCESS FLOW)
Job Training Mechanical Technician Course Module 7 Valves
Introduction
Valves were mentioned in the earlier module Pipework, where they were listed with other pipe fittings. Because they are the most important part of any piping system, they are described more fully in this module. The gas liquefaction process uses a lot of valves. ADGAS uses many different types of valves in a large range of sizes.
Valves control the flow of fluids through pipes by:
- starting and stopping the flow—to control the process or isolate part of a pipeline
- changing the flow rate—allowing more or less fluid to flow
- re-directing flow from one line to another at a pipeline junction
- allowing flow in one direction only
- reducing fluid pressure
- keeping the pressure in a container or pipeline below a fixed maximum
- preventing accidents by relieving overpressure in a container or pipeline.
- valve type—to suit the task it performs, as described above
- size—to suit the pipe size and the flow rate required
- material—to suit the fluid passing through it and to avoid corrosion The ADGAS Piping Specifications list the valves used for all applications on the plant.
Job Training Mechanical Technician Course Module 7 Valves
Introduction
Valves were mentioned in the earlier module Pipework, where they were listed with other pipe fittings. Because they are the most important part of any piping system, they are described more fully in this module. The gas liquefaction process uses a lot of valves. ADGAS uses many different types of valves in a large range of sizes.
Valves control the flow of fluids through pipes by:
- starting and stopping the flow—to control the process or isolate part of a pipeline
- changing the flow rate—allowing more or less fluid to flow
- re-directing flow from one line to another at a pipeline junction
- allowing flow in one direction only
- reducing fluid pressure
- keeping the pressure in a container or pipeline below a fixed maximum
- preventing accidents by relieving overpressure in a container or pipeline.
- valve type—to suit the task it performs, as described above
- size—to suit the pipe size and the flow rate required
- material—to suit the fluid passing through it and to avoid corrosion The ADGAS Piping Specifications list the valves used for all applications on the plant.
Liquid Process Piping Part 5: Valves
For liquid piping systems, valves are the controlling element. Valves are used to isolate equipment and piping systems, regulate flow, prevent backflow, and regulate and relieve pressure. The most suitable valve must be carefully selected for the piping system. The minimum design or selection parameters for the valve most suitable for an application are the following: size, material of construction, pressure and temperature ratings, and end connections. In addition, if the valve is to be used for control purposes, additional parameters must be defined. These parameters include: method of operation, maximum and minimum flow capacity requirement, pressure drop during normal flowing conditions, pressure drop at shutoff, and maximum and minimum inlet pressure at the valve. These parameters are met by selecting body styles, material of construction, seats, packing, end connections, operators and supports.
Liquid Process Piping Part 5: Valves
For liquid piping systems, valves are the controlling element. Valves are used to isolate equipment and piping systems, regulate flow, prevent backflow, and regulate and relieve pressure. The most suitable valve must be carefully selected for the piping system. The minimum design or selection parameters for the valve most suitable for an application are the following: size, material of construction, pressure and temperature ratings, and end connections. In addition, if the valve is to be used for control purposes, additional parameters must be defined. These parameters include: method of operation, maximum and minimum flow capacity requirement, pressure drop during normal flowing conditions, pressure drop at shutoff, and maximum and minimum inlet pressure at the valve. These parameters are met by selecting body styles, material of construction, seats, packing, end connections, operators and supports.
Chapter 7 Control Valves
INTRODUCTION
In process systems, the final control element is normally a pneumatically actuated control valve, which is used to pneumatically actuated control valve, which is used to regulate the flow of a fluid. It provides the necessary power to translate the controller to translate the controller s' output to the process output to the process. Pneumatics is used because of the original popularity of
pneumatic control systems and the comparatively low pneumatic control systems and the comparatively low operating pressures used, also for safe operation in the hazards facilities hazards facilities.
As shown in the figure, in the basic components of a control loop, the control valve is subject to the harshest conditions.
A control valve is also the most expensive item and the most prone to incorrect selection.
Chapter 7 Control Valves
INTRODUCTION
In process systems, the final control element is normally a pneumatically actuated control valve, which is used to pneumatically actuated control valve, which is used to regulate the flow of a fluid. It provides the necessary power to translate the controller to translate the controller s' output to the process output to the process. Pneumatics is used because of the original popularity of
pneumatic control systems and the comparatively low pneumatic control systems and the comparatively low operating pressures used, also for safe operation in the hazards facilities hazards facilities.
As shown in the figure, in the basic components of a control loop, the control valve is subject to the harshest conditions.
A control valve is also the most expensive item and the most prone to incorrect selection.
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