Understanding the Actuated Valve: Types, Benefits, and Applications

What is a valve actuation?

A valve actuator is an electrical device used in valve operation using a power supply to run a valve. Generally these energy resources can be from mechanical devices pneumatic or hydraulic (air pressure or slurry). The actuator is divided into 2 main types, one for each type of valve required for it.

An actuated valve is a type of valve that is operated by an electrical actuator alone. Examples of actuated valves include butterfly valves, which are known for their efficiency and lightweight design, and gate valves, which are essential in automated systems for flow control. Butterfly valves are particularly advantageous for larger pipe sizes, while gate valves require linear actuators for their operation.

Critical components in actuated valves include the valve body, which is the main part where components ball valves are attached and flow is directed, and the valve stem, which connects actuators to valves and is manipulated to open or close the valve.

Types of Actuated Valves

A valve actuator can be manufactured in a variety of designs to suit different applications and in a variety of industries. Pneumatic valve actuators, for instance, are power-operated mechanisms that control the opening and closing of valves using air pressure to create linear motion or rotary motion. Several types of products have unique characteristics to meet a particular requirement. This section reveals many of the common types of valve actuators, giving you insight into their unique features and functions. Additionally, solenoid valves, often referred to as pilot valves, are essential components used in conjunction with pneumatic actuators.

1. Manual-Actuated Valves

Manual valves are easy and inexpensive and require no humans to adjust the valve position. This valve is designed primarily for use with low-tech systems that require manual actuator no automation.

2. Hydraulic-Actuated Valves

Hydraulic-controlled valves use hydraulic components using pressure pumped into them to regulate valve movement. This valve is used for applications where significant force needs to be supplied and consequently hydraulic systems provide considerable power. Heavy machinery and construction equipment often require hydraulic valve actuation for precise control. Their high strength makes them invaluable in a variety of applications, including heavy lifting, equipment positioning and control of hydraulic circuits. In contrast, pneumatic and hydraulic actuators require fluid or compressed air to function, whereas electric actuators are often preferred over linear valves for their reliability and ease of use in various industries.

3. Electric Actuators

Electric actuators are popular because they are reliable. Electric actuators do not require water or pressure to operate and use hydraulics. They utilize electric motors to rotate the valves. Electric actuators are widely used in various industries as well as businesses. Similarly flexible electric actuators are commonly used for continuous positioning control equipment. Electrically operated actuators are common for industries as diverse as the energy sector and the pharmaceutical industries.

Comparing Valve Actuator Types

The table below provides an easy comparison of various valve actuator types: This table does not constitute an exhaustive list of piston actuators. It is advisable to consult an experienced valve specialist when evaluating valve actuators. Understanding what types of actuators are used is crucial for optimum operation and longevity of controls. Choosing the proper valve actuator increases the reliability of your hoses and pipes, reduces maintenance costs and improves availability.

Pneumatic actuators can close the valve promptly in emergency situations, ensuring safety and reliability in process control fluid pressure and systems.

Valve Actuator Options

• Pneumatic actuators use compressed air to create the force needed to operate the valve.
• Electric actuators use an electric motor to move the valve in a linear or rotational motion.
• Hydraulic actuators use liquid pressure to make the valve mechanism move.
• Solenoid valves control the air supply to pneumatic actuators, playing a crucial role in various applications. However, they have limitations in flow rate and pressure drop compared to other valve types.
• Each type of actuator has its own advantages and disadvantages, and the choice of actuator depends on the specific application.

Benefits of Actuated Valves

• Actuated valves provide precise and efficient management of the media they handle.
• Actuated valves can be controlled remotely, making them ideal for applications where manual operation is not feasible.
• Actuated valves can be integrated with control systems, allowing for automated control and monitoring.

Applications of Actuated Valves

• Actuated valves are used in various industries, including manufacturing, oil and gas, chemical processing, and more.
• Actuated valves are used in applications where precise control of fluid flow is required, such as in process control systems.
• Actuated valves are also used in safety systems, such as emergency shut-off systems in gas pipelines.

Valve Actuator Features

• Valve actuators can be equipped with position control, flow control, and process control functions.
• Modern positioners are equipped with self-adaptation and fully-fledged process controllers (PID controllers).
• Actuators can also be designed with diagnostic functions and logging capabilities.

Safety Features of Valve Actuators

• Actuators can be designed to switch off automatically when reaching the end position.
• Two fundamentally different switch-off mechanisms can be used: limit seating and torque seating.
• Torque switching is also used for overload protection over the whole travel.

Choosing the Right Valve Actuator

• The choice of valve actuator depends on the specific application and the type of valve being used.
• Factors to consider when choosing a valve actuator include the type of power source, the required force and speed, and the level of precision required.
• It is also important to consider the safety features and diagnostic capabilities of the actuator.

Installation and Maintenance of Actuated Valves

• Actuated valves require proper installation and maintenance to ensure optimal performance and longevity.
• Regular maintenance tasks include checking the air pressure, hydraulic fluid level, and electrical connections.
• It is also important to perform routine inspections of the valve and actuator to identify any potential issues.

Troubleshooting Actuated Valves

• Common issues with actuated valves include faulty actuators, incorrect air pressure, and electrical connection problems.
• Troubleshooting techniques include checking the valve’s position, monitoring the actuator’s performance, and inspecting the electrical connections.
• It is also important to consult the manufacturer’s documentation and seek professional assistance if necessary.

Frequently asked question

What is the difference between an actuator and a motorized valve?

The industrial valves have many different openings and closing options. Several valve controls require human operation. Many severe services however require an actuated actuator to shut the valve open or down the valve if required. The actuator is how this process can go on without humans interacting with it.

How do I know if my valve actuator is bad?

The water pressure doesn’t reach the proper level. Debris can appear in water. The valve emits loud noises including hissing and clicking noises. The actuator valve is not open and closed completely.

How does an actuator valve work?

Upon receiving the pneumatic signals from the Pilot, the actuator exerts a pressure on the actuator phragm. It opens a valve and allows fluids or gases to pass through valve orifices (using an open-close or failure-close arrangement).

Conclusion

In conclusion, actuated valves are a crucial component in industrial processes, providing precise and efficient control over fluid and gas flow. With various types of actuators available, including pneumatic, electric, and hydraulic, actuated valves can be tailored to meet the specific needs of each application. Custom valve solutions can also be designed to meet the unique requirements of high-volume OEM needs. By understanding the different types valve functions of actuated valves and their working principles, industries can optimize their processes and improve overall performance.