Questions tagged [pneumatic]

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Differential pressure in manometer Mx

For the pneumatic command circuit, if you press button B1 for 0.3 s, after 2 s the differential pressure in manometer Mx will be: a) 0 bar; b) 6 bar I think the right answer is not 0 bar. However, I ...
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3 answers
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Why aren't pneumatic/hydraulic artificial muscle actuated humanoid robots more common?

I'm designing a humanoid robot using pneumatic artificial muscles. I chose these actuator units because they're much cheaper than electric motors of comparable power output capability. instead of ...
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17 votes
4 answers
5k views

Why are train brakes so complicated?

The concept is simple enough: no pressure in the train line has the brakes locked, full pressure is loose, and partial pressure drags accordingly. So if pressure is lost for any reason, the train ...
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3 votes
2 answers
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Why do pneumatic valves need both a Safety Relay and an Air Dump to be safe?

If air dumps safely release pneumatic pressure from an industrial machine when an E-Stop is pressed, why is it also standard practice to cut electrical control power from the valves with a safety ...
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Pneumatic cylinder extension rod preloading

I've been working on converting a 500Kg pneumatic press to use it for injection molding. In order to do that though I'd like to raise the cylinder up maybe 12". So I fabricated 4 5/8 CR rods and ...
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multiple sequencing circuit for sequence A+B+B-C+C-A- by Cascade method

I am learning pneumatic circuit and i came across this problem of Designing and draw the multiple sequencing circuit for sequence A+B+B-C+C-A- by Cascade method for the Pneumatic system. the sequence ...
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1 answer
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Triangle symbol in pneumatic diagrams

After searching details regarding direction control valves, I can understand that the diagonal line indicates solenoid valve actuation. The zig Zag line represents the spring action so in this case ...
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2 answers
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Force control of pneumatic piston

I am building a small testing device consisting of a double acting pneumatic cylinder. I am using an existing pneumatic line running at 100 psi and I would like to control the force exerted by the ...
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2 answers
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Is a pneumatic cylinder in general a linear or rotary actuator?

I've just begun to learn pneumatics and I'm really confused where the pneumatic cylinder falls under in the categorization of what kind of mechanical motion it is suppose to produce. I've seen one ...
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2 answers
50 views

What is the name for a low pressure, low volume air reservoir?

I'm working on a project that requires very precise, but low pressure controls. I'm using a pump to charge a chamber to <15kPa, then a manifold of proportional valves to control output pressures ...
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1 answer
68 views

Pneumatic valve clicks but doesn't actuate

I am trying to build a door to a hidden room and want to use pneumatics to open the door. I have purchased some equipment to test with, namely a 12 inch Parker air cylinder and a U.S. Solid 5 way 2 ...
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1 answer
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What Rubber is Best for Laser Cut McKibbens PAMs?

I'm a layman engineer who's decided to take another step forward in my research and work with McKibbens Pneumatic Artificial Muscles. I’m new to creating custom rubber components and laser cutting, so ...
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1 answer
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Circuit to provide position control for double action hydraulic actuator

I was wondering how to construct a hydraulic circuit to control a hydraulic double acting piston/actuator enabling the electronic control of the piston extension. I have found the following pneumatic ...
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1 answer
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Can air flow occur in both directions in a 2 way solenoid valve?

I'm designing a system where I need to fill and exhaust air from an an air bag. The air will be supplied from a dc motor. As of right now I've been considering placing a 2 way solenoid valve for air ...
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2 answers
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How do I connect multiple water-filled syringes?

I'm trying to connect 4 separate syringes containing water and we need water-tight tubing to prevent water from leaking out of the system. The water would theoretically need to be pushed out of one ...
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Using Density Correction Factors for Fans and Blowers

I've been researching fans/blowers and their use in pneumatic systems (particularly conveying systems), and I'm confused by the application of density correction factors. Let me describe a sample ...
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3 answers
312 views

How do I limit the pressure of a tank to a fixed PSI?

I previously asked about the safety of connecting my 150 PSI air compressor to my auxiliary 120 PSI tank. I was warned of possible compromise of the tank which can lead to injuries and even death. It ...
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3 answers
1k views

Is it safe to use a 125PSI rated auxiliary air tank with a 150PSI air compressor?

I have a small, 5 gallon, pancake compressor which has a maximum 150PSI rating. Unfortunately, it doesn't have the air capacity to power the demands of an HVLP paint sprayer or a die grinder without ...
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1 answer
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How do I increase negative air pressure without inhibiting airflow?

I would like to increase the vacuum power of my desoldering station. It’s a multifunction unit that includes a single vacuum pickup tool, hot air wand and desoldering gun. When using the desoldering ...
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1 vote
2 answers
44 views

What is this pneumatic connector called?

I'm looking into fitting ball-type inflatable equipment (eg bike tires, yoga balls, basketball ball, etc) to a 2/4 silicone tube. This will be to measure the pressure inside the inflatable, so the ...
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3 answers
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How does 3 "liars" in Strandbeests work?

See video: https://www.youtube.com/watch?v=75Z7-gmd_qk&t=226 This does not make sense to me. As far as I got it, bottom pipe is isolated from top 2 and just controls valve of the top 2 pipes. So, ...
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1 vote
0 answers
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How to repair stripped, leaky pneumatic fitting?

I have a pneumatic cylinder with a stripped fitting, which causes a slow leak. I took it to a machine shop and he tried to re-thread it but there wasn't enough good metal left to get a good thread. He ...
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1 answer
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Linear pneumatic actuator opening time - pressurise connection pipe

I would like to estimate the time needed to open a linear single-acting pneumatic actuator. The actuator's piston is loaded with a spring pushing downwards and the operating fluid (air or nitrogen) ...
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2 answers
23 views

How to achieve pulsation damping in pneumatic rather than hydraulic system?

My background is in electrical engineering so I am something of a novice when it comes to pneumatic systems, but I have been tasked with designing a sampling system that draws an extremely low flow at ...
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1 vote
2 answers
26 views

Regulating pressure down inside vessel as it increases

I want to keep the pressure inside a balloon (effectively - a rubber vessel) constant, as the balloon is compressed. I'm wondering if a regulator like this (wiki page here showing mechanism - I ...
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3 votes
2 answers
918 views

What is the equivalent of a capacitor in pneumatics?

I am building a desoldering gun. While the pump I am using provides decent suction, I would like a quick powerful vacuum burst to prevent the solder from solidifying in the nozzle rather than in the ...
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1 vote
2 answers
35 views

Need to route air, like a solenoid does, but with many output directions

There might be a proper term for what I'm looking for, but forgive me, I'm not a professional engineer. I have a small cylinder with compressed air that connects using push-to-connect's (like these). ...
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2 votes
1 answer
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Can I submerge a pneumatic cylinder in oil?

I am looking for a linear pneumatic cylinder to raise and lower a fixed object. Everything will be submerged in oil (for electrical purposes). I am new to engineering and pneumatics in particular, and ...
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1 answer
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Emulate impact forces using pneumatic piston

I am trying to test a piece of furniture based on a particular code, the code states that i can either drop a bag (with a specific shape) of 57 kg 1.2 in above the seat or I can use other methods as ...
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1 answer
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How to ensure uniaxal and uniform force application on uneven samples using pressurized fluids

I am trying to apply a compression force to samples using air. I do not want to directly apply my loading since my samples are irregular. I do not wish to process them with a flattening step. I hope ...
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1 vote
2 answers
127 views

Designing a pneumatic system for consistent pressure/flow

Fellow engineers, I need your help in improving my design for a pneumatic system for maintaining a constant supply of at least 90 PSI and 20 CFM for a particle analyzer with stringent air requirements....
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2 answers
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Ideas needed: how to tilt a panel side to side [closed]

requirements: a panel of wood 4 ft long by 2 ft wide laying flat this panel should be able to tilt side to side (2 way) the weight on the panel will be about 250 lbs up to 400 lbs. controlled lift of ...
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1 vote
0 answers
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Is this Proportional Electro-pneumatic valve a direct replacement for other valves listed?

In the midst of trying to redesign the pneumatic subsystem of a combined system, I'm at the point of validating a new valve would serve as a direct replacement. The reason for the redesign is an ...
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5 votes
1 answer
597 views

I want to understand this pneumatic circuit

I have trouble understanding the following pneumatic circuit diagram: I am new to reading circuit diagrams and i am unfamiliar with some of the symbols. I would appreciate if somebody could explain ...
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Choosing a blower for a Pneumatic Conveyor

Basically we are designing a pneumatic conveyor system for transferring 11 tons of beans per hour. We need to decide on the specifications of the blower. What are the calculations necessary to decide ...
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1 vote
1 answer
382 views

Pneumatic cylinder: Pressure rating

I want to create a Pneumatic cylinder, The purpose is, Inside it will will contain a Nylon piston, and one end will be filled with clay. Cylinder will be closed from either side using end caps, which ...
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1 vote
1 answer
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How do I connect pneumatic components with metal tubing?

I'm building a small pneumatic control cabinet with a couple filters, regulators, valves, and flow restrictors. I had started by using 8 mm push-to-connect fittings and nylon tube, but it seems I can ...
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1 answer
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What is the "quick bleeder valve" in this tool changer pneumatic schematic (and other questions)?

I'm building a CNC router around a HSD ES330 spindle motor that has pneumatic tool-changing ability. The manual recommends the following pneumatic circuit: I'm not sure I understand the purpose of ...
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1 vote
1 answer
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Why were pneumatic thermostats commonly installed in buildings?

According to Wikipedia, pneumatic thermostats were invented after electric thermostats. Yet this article claims that "at least 25 percent of U.S. commercial buildings are served by pneumatic controls,...
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1 vote
1 answer
38 views

Best balance of electrical and pneumatic control lines in CNC router table?

I'm building a 4' x 8' gantry-style CNC router table. The spindle motor uses pneumatics to power its draw bar (for automatic tool changes). There are three separate pneumatic supply lines that go to ...
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3 votes
2 answers
3k views

What's the difference between a vacuum regulator and pressure regulator?

When browsing through pneumatic parts, I notice that some vendors specify different components for pressure regulator and vacuum regulators. SMC for example does this. I'm curious why vendors would ...
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2 answers
608 views

Is it standard practice to use a pressure relief valve as a pressure regulator?

I'm attempting to understand the difference between a pressure relief valve and a pressure regulating valve. From my research far, I've come to the following conclusion: Pressure relief valves are ...
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1 vote
1 answer
3k views

How do you interpret a pneumatic regulator symbol?

I'm an EE trying to interpret a pneumatic schematic and have a few questions regarding the symbols being used. I've come across two different regulator symbols (or so I believe them to be regulator ...
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1 answer
92 views

How to maintain a static negative pressure in a valve?

My target is to create a valve with multiple inlet capillaries. And my output is a pipe of a larger diameter. I do not want to use any electrical systems, and at the same time, I want to maintain ...
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1 vote
1 answer
374 views

What type of pneumatic valves would represent the valves in the schematic?

What type of pneumatic solenoid valves would represent the valves in the schematic? Specifically, the lower valves could be represented by a 5 port 4 way 2 position valve. This is because there is ...
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2 votes
1 answer
53 views

Pneumatic actuator capable to achieve 5m/s?

Is there a pneumatic actuator capable to achieve 5m/s and will be good idea for constant work? I know SMC have up to 3m/s, but I can't find faster.
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2 votes
1 answer
122 views

How to connect a pneumatic cylinder to a door?

I have this pneumatic cylinder that I wish to connect to a wooden door in order to make it kinda like a Star wars door. I'm wondering what the best way to connect the cylinder to the door would be. ...
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1 vote
2 answers
62 views

Cylinder Reconditioning [closed]

When reconditioning of a pneumatic cylinder, which fit between piston and cylinder is required? and how much tolerance between mating parts is required?. Will surface finish inside of cylinder play a ...
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2 votes
2 answers
985 views

Lpg cylinder to compressed air tank

I am building a small robot having pneumatic system. I am using 12v car tyre inflator as my compressor.But i didn't find any 3ltr to 6ltr standardrd air tank. Can i convert my old 3ltr lpg tank into ...
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1 vote
0 answers
27 views

Air demand for powder fluidization system

I need a good estimate of the air demand for a system to fluidizde a powder. We a have silo with a 60° cone and a rotary cell feeder attached to the opening in the cone. The powder (fine powdered ...
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