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A flow control valve regulates the flow or pressure of a fluid. Control valves normally respond to signals generated by independent devices such as flow meters or temperature gauges.
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Globe control valve with the pneumatic actuator and smart positioner. The loop current and stem travel are displayed.Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves and diaphragm valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used.
Control valves can also work with hydraulic actuators (also known as hydraulic pilots). These types of valves are also known as automatic control valves. The hydraulic actuators respond to changes of pressure or flow and will open/close the valve. Automatic control valves do not require an external power source, meaning that the fluid pressure is enough to open and close them.
Automatic control valves include pressure reducing valves, flow control valves, back-pressure sustaining valves, altitude valves, and relief valves.
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Example of current loops used for sensing and control. Specific example of a smart valve positioner used.Process plants consist of hundreds, or even thousands, of control loops all networked together to produce a product to be offered for sale. Each of these control loops is designed to keep some important process variable, such as pressure, flow, level, or temperature, within a required operating range to ensure the quality of the end product. Each loop receives and internally creates disturbances that detrimentally affect the process variable, and interaction from other loops in the network provides disturbances that influence the process variable.[1]
To reduce the effect of these load disturbances, sensors and transmitters collect information about the process variable and its relationship to some desired set point. A controller then processes this information and decides what must be done to get the process variable back to where it should be after a load disturbance occurs. When all the measuring, comparing, and calculating are done, some type of final control element must implement the strategy selected by the controller. The most common final control element in the process control industries is the control valve. The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds, to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point.[1]
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If you are looking for more details, kindly visit flow control gate.
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Fisher - Control Valve Handbook, Fourth Edition, Fisher Controls International,
Flow control valves are vital and essential components of fluid systems and are used to provide precise control over the rate at which fluid can pass through a system of pipelines. You&#;ll mostly hear about the use of flow control valves in hydraulics but they can be used in a variety of settings, inducing commercial, industrial and residential settings.
While you may need a flow control valve to control the rate of fluid within a circuit you may be wondering how a flow control valve works and in what settings they&#;re most likely used. Here in this article, we will delve into the main purposes of flow control valves. You will learn about the different types of flow control valves that are available and how does flow control work across different settings. Read on to find out more.
While the concept of a flow control valve may sound confusing and complicated, in fact, they are pretty straightforward. A flow control valve adjusts and controls the flow of air or liquid within a system. Many people get confused between flow control valves, pressure controllers, and regulators. But while there are similarities, they do not work in the same way. For example, the use of a pressure regulator to control flow has the potential to damage components and can result in wasted energy.
Therefore, flow control valves work by using mechanisms to control the flow rate. One of the most common flow control valve types is the needle valve This features a needle-like plunger that allows or restricts fluid flow by adjusting its position. This works as when the needle valve is partially closed the space through which the fluid travels is made smaller, which leads to a reduced flow rate. However, if the opening valve increases the size of the space then more fluid can pass through.
The ball valve is another type of flow control valve and it uses a spherical ball with a bore through the centre. Operators can control the flow rate using this kind of valve by rotating the ball. When the ball is rotated to line up with the pipeline fluid can be free-flowing. But if the rotating ball is perpendicular to the pipeline then the flow is restricted.
There are not only examples of techniques and mechanisms that flow control valves can use. Flow regulation can be achieved using disks, spools, or plates. The different mechanisms used depend on the specific design and application requirements.
One of the main purposes of flow control valves is to allow users to regulate and adjust the flow rate of fluids within a specific system. They&#;re used by operators to increase or decrease the volume of fluid passing through a pipeline by manipulating the valve&#;s settings. This is particularly popular in scenarios where specific process requirements are needed.
Flow control valves are also used to help prevent excessive flow rates. This is such a crucial purpose as it could prevent potential damage to equipment or cause system instability. Therefore, by limiting the fluid flow, the valves can ensure that systems are operating safely while preventing potential hazards or costly damages.
Another purpose of flow control valves is to balance flow distribution. This means that within systems that have multiple outlets or branches, valves can be used to ensure a precise balancing of fluid distribution. Adjusting each valve individually allows operators to ensure that each branch receives the flow rate required to ensure the overall performance and functionality of the system.
Now that we&#;ve discussed at length how flow control valves work and understand the main purposes of flow control valves, here are some applications of flow control valves and how they can be used.
You can find flow control valves are used extensively across a wide range of industrial settings. In particular, within the oil and gas industry. Flow control valves are used within this sector in pipelines, offshore platforms and refineries to regulate the flow of various fluids including crude oil and natural gas. They&#;re used within this setting to ensure safe and efficient processing, distribution and transportation of fluids and gasses.
Another example of where fluid control valves are used is within water management systems that control the flow of water in wastewater treatment plants, dams and irrigation networks. These valves play a crucial role in maintaining optimal water levels and ensuring effective water distribution and preventing flooding.
As we have demonstrated above, flow control valves are essential devices in fluid systems that offer a way for operators to precisely control flow within a system. From irrigation systems to hydraulic systems, regulating flow rates can ensure system functionality, avoid damage to systems and ensure optimal performance.
For more information about any of our different types of flow control valves, or to discuss your application requirements in more detail, please contact Fluid Controls today on +44 (0)118 970 or .
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