Questions You Should Know about Fluid Control Solutions

All Important Questions on Control Valves Answered

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The valve industry has seen a tremendous growth in the last century. The valves have become an integral part of several industries, because they are specifically developed to meet typical requirements. The control valves are one of the important types of valves used in various process industries to meet flow requirements. How do they work? What is the principle of operation of the control valves? Do these questions bother you? This post answers all the important questions regarding control valves

Why are Control Valves Used?

Every process plant is made of several thousands of control loops, which are networked together to form a network. A control loop is designed to control the process variables such as flow, pressure, level, and temperature in a required range. Each of these loops are subjected to certain internal disturbances. These disturbances may affect the process variable. When a disturbed loop interacts with other loops, the result is often disastrous. Hence, various types of sensors and transmitters are used to collect the information on the process variables at a desired set point. The information collected by these devices are processed by the controller. It decides how to get the process variable back to its desired position after a disturbance. Once all the measurement, comparison, and the calculation is done, a final control element implements the action decided by the controller. The control valve is most often the final control element of the process industries.

In short, the control valve regularizes the flow of gas, water, steam, and chemical compounds, to compensate for the disturbance of the load. It helps keep the process variable close to the desired point.

Generally, the globe valves are used as the control valves. The ends of these valves are flanged, which aids in easy maintenance.

What is the Principle of Operation of a Control Valve?

The control valve features an actuator that is mounted on the valve. The valve usually modulates the flow of the fluid through the movement of the valve plug. This valve plug is attached to a valve stem that is connected to the actuator. This actuator is electrically or pneumatically operated, and it directs the stem movement as dictated by the control device, located externally.

• Electric Actuators

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  : Driven by motors, these systems utilize an electric input signal to stir the rotation of the motor shaft. This rotation is translated into a linear motion, which drives the plug assembly, as well as the valve stem for the flow modulation.

• Pneumatic Actuators

  : These actuators create a modulating control action by utilizing a air signal from the external control device. The air signal is received into the actuator through a port, and it is distributed across the actuators diaphragm. This diaphragm creates pressure on the spring return assembly, as well as the diaphragm plate, which stirs the downward motion of the plug assembly and the valve stem, and strokes the valve.

What are the Common Problems Faced by the Control Valves?

If you notice that the control valve is not working as desired, then they may be facing any of the below mentioned problems.

• Improper or faulty accessories
• Loosening mechanical linkages
• An over or under sized actuator
• Excess friction on the valve actuator or the valve body 

There might be several reasons affecting the performance of control valves. How to identify them? This is where you may require an expert&#;s intervention. The industry expert will understand your problem and give you a solution to overcome it.

Related Posts

Automated fluid management systems have gained a lot of popularity in the recent past. Production processes in biopharma have never been more competitive. New advances and research in gene and antibody therapy have called for more streamlined production steps.

An important factor is safe and efficient fluid handling, which is still often carried out manually. This does not only leave more space for human errors, it can also affect staff and patient safety. Automated fluid management systems, in combination with single-use technologies, help to reduce product loss and rid medical staff of monotonous and laborious tasks like pipetting.

However, as not every fluid management system is the same in terms of production yields and functions, there are several considerations to be taken into account. Here are seven questions you should ask to make the right choice.

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