Hundreds of different sectors require pneumatic actuators, particularly for usage in situations where valves need to be opened and shut down. They are useful in industrial settings where there is a threat of fire or ignition. The most well-known benefit of pneumatic actuators is their high level of dependability, efficiency, and safety.
When there is a need to get different types of valves for industrial, commercial, and residential applications, acquiring from Dombor valve manufacturer is the best as they produce the best quality valves. Read this post to learn more about pneumatic actuators, including their types, uses, and workings.
What Is The Pneumatic Actuation System
The energy of compressed air or gas is transformed into a mechanical motion by pneumatic actuators, which operate one or multiple absolute control elements. They are employed as an automation control method to lessen necessary human engagement with a system’s internal workings, which is especially useful for automatic modulation and quick shutdowns.
Based on the device’s design, a pneumatic actuator might be linear or rotary. Typical actuators move a piston along the inside of a hollow cylinder and develop pressure using an external compressive force like compressed air or gas. It produces a linear force that is utilized to move a load along a straight line related to the piston’s surface area and pressure differential.
Despite the fact that linear pressure actuators have been in use for many years, improvements in diaphragm design and sealing abilities have greatly increased the technology’s effectiveness and functional range. In contrast to linear systems, rotary pneumatic actuated valve models generate torque rather than moving linearly. It can be done by converting a piston’s linear motion into the motion of a spinning component or the other way around.
Generally, industrial pneumatic systems utilize pressures of 80 to 100 pounds per square inch (psi). Actuators are then employed for the manipulation of inlet vanes, dampers, louvers, valves, fluid drives, turbine governors, and various control elements, ranging in size from relatively modest to huge loads.
An automatic valve or plate that controls the flow of air inside a duct or airflow control system is called a pneumatically powered damper. It is crucial for combustion operations because little or too much air can lower the heat rate and energy output from burning fuel and increase the production of hazardous pollutants like carbon monoxide. Damper supervision is one of the direct applications of rotary and linear pneumatic actuators.
How Pneumatic Actuator Works
The valve regulates the fluid’s pressure, flow direction, and flow rate. The piston receives a return stroke from the spring unit, which successfully transports air from one place to another. The pneumatic actuator function initially remains open in the absence of any supplied air, pulling the diaphragm upwards through the spring action. The valves for oil and gas are widely used in applications related to oil and gas sectors.
But when air is extracted from the atmosphere, it is first put through a filter before being supplied to the compressor. The air is now compressed by the compressor, raising the level of pressure. It should be mentioned that the air’s temperature increases along with its pressure level. As a result, to retain the temperature to a reasonable span, air coolers are utilized.
To retain the pressure level, pressurized air is now kept in a storage reservoir. Additionally, the pressured air inside the system exerts pressure on the actuator’s diaphragm. The diaphragm moves downward and shuts down the control valve when the force of the compressed air exceeds the force of the spring that holds it in place at the top.
The diaphragm constantly travels downward as supply air pressure rises, totally shutting down the valve at a specific point. However, as soon as the supply pressure drops, the spring’s force on the diaphragm takes over and exceeds the supply pressure’s force. The actuated valves are obtainable in different designs.
The valve is opened as a result of it moving the diaphragm upward. It should be pointed out that the air pressure affects where the control valve is located. As a result, the movement of the diaphragm and air pressure are related, as is the opening and shutting down of the control valve.
The presence of the actuators follows a controller that sends a control signal to cause the desired action to happen. The air pressure changes in response to the acquired control signal, which also changes the position of the control valve. In this manner, the actuator’s internal assembly controls the procedure by responding to the obtained control signal.
What Are The Advantages And Drawbacks Of Pneumatic Actuators
Advantages Of Pneumatic Actuators
The primary advantage of pneumatic actuator valves is speed. High-speed motion and energy release are both made possible by compressed air. It is best to use a pneumatic actuator if speed is more critical than power in the desired application. Here are the major advantages of pneumatic actuators:
Because they are the fastest on the market, pneumatic actuators provide long cycle times. Incredible productivity is possible with boosted duty cycling, which leads to profitability and a fantastic investment return. The pneumatic actuator control functions are also easy.
Pneumatic actuators typically cost less to buy than hydraulic or electric actuators. This results in less capital being invested up front and a faster rate of return. For light-duty and medium-duty applications, pneumatic actuators are a cost-effective option.
Pneumatic actuator systems consist of five primary parts, yet they have a very simple design. There are typically fewer potential problems and fewer problems to fix as the design is simple. The pneumatic actuated valves must be manufactured with quality control measures.
Drawbacks Of Pneumatic Actuators
The primary drawback of pneumatic actuators is their relatively low strength or work capacity. The following are other major drawbacks of pneumatic actuators:
- Limited power
The limited power only becomes a problem if the desired application is large and cumbersome. There is a limit to how much pressure can be created in pneumatics since pressure equals power.
Water is present in compressed air. The amount of air-water content in the facility is greatly influenced by temperature. When the temperature is excessively high or overly low, pneumatic actuators work poorly and are prone to water effects.
- Short lifespan
Pneumatics are not known for being as durable as hydraulic actuator valves. The pneumatic actuator will not survive long, so it is better to be aware of it if you desire long-term service.
What Are Pneumatic Actuator Applications
Here are primary industries where pneumatic actuators are widely used:
- Chemical And Processes Industries
Pneumatic actuators are only used in valves to regulate the flow of chemicals in the chemical and process sectors. The pneumatic actuators are frequently employed to assure safety and dependability in these industries because they frequently execute hazardous jobs like regulating poisonous or hazardous materials. As a result of their durability and capacity to tolerate high temperatures, pneumatic actuators are frequently used in steam, gas, and thermal power stations.
- Water Treatment Plants
Pneumatic systems are used to control 30% of the industrial valves in water treatment plants. They are also utilized in valves, filter membranes, sensors, and devices. Utilizing a compressed air module that may be monitored locally is advantageous to the system as a whole because monitoring systems can hinder bandwidth in water treatment plants due to their large physical footprints.
- Food Handling Industry
It is considerably more likely for hydraulic liquid or electricity to spill and contaminate food than it is for compressed gas to leak and slow down production. It is crucial to have robust actuators that halt spark and food from getting contaminated. Pneumatic systems will be used extensively in the food processing industry for this reason.
- Electronic Industry
Electronic component manufacturing and assembly is a precise and time-consuming process. The pneumatic system is able to position itself with accuracy and rapid speed. Pneumatic also offers a longer-term and more cost-effective alternative than hydraulic actuators due to the shorter product cycles in the electrical sector.
- Manufacturing Industry
Although there are many different industrial processes, a pneumatic actuator will nearly always find a use in the manufacturing sector. Because of their longevity and fewer maintenance requirements, they are utilized in the manufacturing sector. Given the size of a manufacturing facility, there is a need for pneumatic systems that would not require frequent refueling or maintenance, unlike hydraulic and electrical systems.
Automotive, agriculture, laboring, amusement park rides, packing, textile industry, power generation, and coal mining equipment industries also use pneumatic actuators. These actuators also are utilized for bicycle pumps, air conditioning, lawn mowers, doors, under-bed storage, and so on.
There are numerous uses for pneumatic actuators. The pistons and ignition chambers of gasoline-powered automobiles are the most typical applications. Packaging and production equipment, air compressors, mail tubes, and transportation apparatus applications all depend on these actuators. They are essential in numerous other industrial settings where a switch, pump, or sensor controller is required.
Regardless of the type of valve your business requires, make sure to contact Dombor. We manufacture all types of industrial valves and supply them in bulk quantities at a reasonable price range.