Valve Actuator types

Types of valve actuator

At times it is necessary for a process engineer to choose between a pneumatically or electrically actuated valve for a system. There are advantages to both styles, and it is valuable to have data available to make the best choice. Compatibility (Power Source) First and foremost in the selection of an actuator type (pneumatic or electric) is to determine the most effective power source for the actuator. Points to consider are: Power source availability Torque at the valve stem Failure mode Control accessories Speed of operation Frequency of operation Plant environment Size of valve System component costs System maintenance The most practical pneumatic actuators utilize an air pressure supply of 40 to 120 psi (3 to 8 bar). Generally they are sized for a supply pressure of 60 to 80 psi (4 to 6 bar). Higher air pressure is usually difficult to guarantee and lower pressures require a very large diameter piston or diaphragm to generate desirable torque. Electric actuators are often used with a 110 VAC power supply but are available with a wide variety of AC and DC motors in single phase and three phase. MORE INFO AT THE WEBSITE

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I got a used STI and it has the Apexi avc-r actuator valve controller type-r on it and i was wondering if i could use it to make it so i can have floor it and it won't go to redline it will go to the set max rpm. Does this have that capability? or dose it only change the turbo settings?

Have your car professionally tuned to drop the red line (aka fuel cut). If that is too much for you, sell that avc-r and get a COBB Accessport (shudder) and find someone who can make you a program to drop the redline for you online - typically free, just kiss a lot of butt - won't hurt. I have built race cars on a team and a pro tune to us is like how building a simple website is to a web programmer, it's part of the basics and should never be overlooked.

Currently it is turned manually by a lever. The lever travels 90 degrees. It is important for the valve to stay closed if the system fails(in the manual configuration it stays closed by itself). Maintain the ability to close the valve manually if the system fails is important. Although getting rid of the lever is not out of the question, if necessary to mount the solution. Electric or pneumatic operation would be ideal. Closing quickly is important, while opening quickly is desirable but not required. The application is mobile so the size and weight of the solution is a factor. So far i have looked at simple electric motors, I don't believe it possible to use these without considerable parts for torque and speed conversion. Also I have considered screw type actuators, Getting the proper type of motion does not seems possible without designing a new valve. Thank you in advance.

I am amazed that you simply haven't done a web search for your answer. Just look at the choices from one search. You are not the first person to have the requirements stated. Many ball valve manufacturers have access to actuators for their valves as well.

Can I put a pneumatic rotary in specific positions if I added some type of feedback to a proportional valve and then the same question for a pneumatic motor? What I need is something that only turns 1260 degrees and I can very it anywhere in between. I would use a proportional pneumatic valve for the actuator but I'm not sure if a motor would be able to be used in that way. Thanks for you answer though!

Yes a pnumatic motor can be positioned especially if the output shaft is geared down to a slower RPM. You can use a simple cam and follower to operate a cutout valve to stop the motor when the shaft reaches a certain position. A rotary actuator is a little trickier as it is designed to be in one position or the other and the position the shaft obtains depends upon the applied air pressure and the amount of load opposing the shaft. To obtain a specific intermediate position you can use a mechanical stop to limit the travel. A separate actuator controls the position of the stop either limiting travel or allowing full travel of the actuator.