answersLogoWhite

0

Pneumatics

Being the driving force behind most factory, manufacturing, mining machinery, heavy vehicles and equipment, pneumatics are a vital part of our industry today. The field of pneumatics is vast and knowledge is constantly requested in the workings and troubleshooting thereof.

464 Questions

What is the basic principle of pneumatic control valves?

Compressed air brake systemCompressed air brake systems are typically used on heavy trucks and buses. The system consists of service brakes, parking brakes, a control pedal, an engine-driven air compressor and a compressed air storage tank. For the parking brake, there is a disc or drum brake arrangement which is designed to be held in the 'applied' position by spring pressure. Air pressure must be produced to release these "spring brake" parking brakes. For the service brakes (the ones used while driving for slowing or stopping) to be applied, the brake pedal is pushed, routing the air under pressure (approx 100-125psi) to the brake chamber, causing the brake to reduce wheel rotation speed. Most types of truck air brakes are drum units, though there is an increasing trend towards the use of disc brakes in this application. The air compressor draws filtered air from the atmosphere and forces it into high-pressure reservoirs at around 120 PSI. Most heavy vehicles have a gauge within the driver's view, indicating the availability of air pressure for safe vehicle operation, often including warning tones or lights. Setting of the parking/emergency brake releases the pressurized air pressure in the lines between the compressed air storage tank and the brakes, thus actuating the (spring brake) parking braking hardware. An air pressure failure at any point would apply full spring brake pressure immediately. Design and functionA compressed air brake system is divided into a supply system and a control system. The supply system compresses, stores and supplies high-pressure air to the control system as well as to additional air operated auxiliary truck systems (gearbox shift control, clutch pedal air assistance servo, etc.). Supply system

" Over simplified" air brake diagram on a commercial road vehicle (does not show all air reservoirs and all applicable air valves).

The air compressor is driven off of the engine either by crankshaft pulley via a belt or directly off of the engine timing gears. It is lubricated and cooled by the engine lubrication and cooling systems. Compressed air is first routed through a cooling coil and into an air dryer which removes moisture and oil impurities and also may include a pressure regulator, safety valve and a smaller purge reservoir. As an alternative to the air dryer, the supply system can be equipped with an anti freeze device and oil separator. The compressed air is then stored in a reservoir (also called a wet tank) from which it is then distributed via a four way protection valve into the front and rear brake circuit air reservoir, a parking brake reservoir and an auxiliary air supply distribution point. The system also includes various check, pressure limiting, drain and safety valves.

Control system

The control system is further divided into two service brake circuits: the parking brake circuit and the trailer brake circuit. This dual brake circuit is further split into front and rear wheel circuits which receive compressed air from their individual reservoirs for added safety in case of an air leak. The service brakes are applied by means of a brake pedal air valve which regulates both circuits. The parking brake is the air operated spring brake type where its applied by spring force in the spring brake cylinder and released by compressed air via hand control valve. The trailer brake consists of a direct two line system: the supply line (marked red) and the separate control or service line (marked blue). The supply line receives air from the prime mover park brake air tank via a park brake relay valve and the control line is regulated via the trailer brake relay valve. The operating signals for the relay are provided by the prime mover brake pedal air valve, trailer service brake hand control (subject to a country's relevant heavy vehicle legislation) and the prime mover park brake hand control.

What is the equation to calculate the stored energy for a pneumatic test for vessel?

ASME PCC-2 Part 5, Article 5.1 Mandatory Appendix II has the calculation to calculate stored energy (in ft-lbs), and converting to equivalent pounds of TNT.

How does an Exhaust fan pneumatic control works?

An exhaust fan pneumatic control system operates using air pressure to regulate the fan's operation. It typically involves a pressure sensor that detects the air quality or temperature levels in a space. When the sensor identifies a need for ventilation, it sends a signal to a pneumatic actuator, which adjusts the fan's speed or turns it on/off accordingly. This method allows for efficient control of air flow based on real-time conditions, enhancing indoor air quality and energy efficiency.

What was the impact on society of pneumatic tire?

The introduction of pneumatic tires revolutionized transportation by significantly improving vehicle comfort and performance. They enhanced road safety through better traction and handling, leading to increased adoption of automobiles and bicycles. This innovation contributed to the expansion of infrastructure, such as roads and highways, and facilitated the growth of industries reliant on efficient transport, ultimately shaping modern urban development and mobility.

How do you make your own pneumatic boat navigation lock?

To make a pneumatic boat navigation lock, you'll need a sealed chamber with entry and exit gates, an air compressor, and a control system. Begin by constructing the chamber using durable materials like reinforced plastic or metal, ensuring it can withstand water pressure. Install inflatable bladders or air cushions that can raise or lower the water level by compressing or releasing air. Finally, incorporate a control mechanism to operate the gates and the air system, allowing for smooth passage of boats through varying water levels.

What treatments were used for the pneumatic plague?

Antibiotics such as streptomycin or tetracycline drugs are given, and symptoms are treated. There is also a vaccination available for people working in or traveling to plague-affected areas of the world.

Do you sleep with a FP Walker Foam pneumatic?

I had mu achillies hear rupture and started using the fp walker. I asked my doctor if i should sleep with it or not. He said that i should sleep with it until my next checkup the following month.

Keep in mind that the fp walker is used instead of having a cast made. And the cast you can not take off.

How do Pneumatic Machines work?

Pneumatic machines are machines powered by compressed air. Air is compressed by a pump called a compressor, and the pressure is released as it does work, pushing on the pneumatic motors or pistons.

How is the diagram for hydraulic bottle jack?

I found the following info that answers this question at

http://www.hyjacks.com/H7.HTM

Which oil used in pneumatic lines?

une huile emulsifiante ( qui se vaporise facilement en fine gouttelette ).

4 examples of a pneumatic device?

erm....

Pneumatic Drill

Pneumatic Cylinder

Pneumatic Actuator

Pneumatic Switch

Pneumatic Nailgun

Pneumatic Air gun

Pneumatic Launcher

Bit more than four, but now you can choose, hope this helps,

What are the advantages of motor operated valves over pneumatic valves?

Good question

Usually motor operated valve used in big pipe lines sizes which it is need strong torque and for ON/OFF condition not to control the process, We can use rather than M.O.V pneumatic ON/OFF valve with piston actuator (Double Acting) but in this case the accessories it will cost you more because you need to provide pneumatic amplifier and big actuator depend on the pipe size.

That is why better to use M.O.V the motor will rotate the gears and the gears will rotate the valve with low cost.

Contact me for more clarification if there is.

Is a volcano a Pneumatic or hydraulic system?

Elements of both but the molten rock pyroclastic flows (Mauna Kea , Hawaii) are hydraulic, the Mt. St Helens eruption was to a large extent pneumatic as the water turned to steam.

How can pneumatic system trobleshoot?

Replace the rubber gasket. Inspection of air valves. Compressor control.

Why you use two switches on PLC for start and stop?

The reason you have to use two switches (a combination of start and stop push button) on PLC is because it is how the program is written.

What is the difference between a Rp and a G thread?

They are both the same thread. They are both calling out a British Parallel Pipe thread. Please do not assume that this is the same as the standard North American pipe thread, as it is not close to the same.

Which scientist constructed the first pneumatic tire?

Robert William Thomson of Stonehaven Scotland in 1945, some 10 years before another Scot John Dunlop.

What does a post production engineer do?

Post Production Engineering

Basically covers hardware software installations, systems integration, networks, storage, film and digital intermediate process; video equipments, cameras, lighting, calibration and alignment.

Designing a post production setup whether its video, film or audio and now into data forms. Mixing it all up and make sure it works for the creative people like Film Directors, 3D artist, Compositors, Animator, Producers, Motion Graphics Artist or Designers.

Example : Telecine (Film to Data or Video), Offline Edit (Film Editing), Color Grading System (Final Grade), Online (Finishes the entire process), Whether its Film Finishing, Video Finishing for TV Station broadcasting or back to Film Process. The Engineer must know the entire process and how different machines from different makes and vendors works together in one setup. Most importantly is implementation.

Why pneumatic system used in injection molding machine?

Pneumatics aren't used in injection molding.
Injection molding is the process of, as the name suggests, injecting polymers into a mold through a heat treatment of the polymer.

It's placed into a bucket in small pieces of coloured plastics, as this feeds into a rotating centre point, it's heated and forced into a smaller and smaller point, then when it comes out of the injection molding machine into the mold itself, it's in liquid form, and the pressure from the molding machine itself forces the liquid polymers into the form of the piece being made.

What is an example of a pneumatic tool?

Examples of pneumatic products include: drills, grinders (metalworking machinery), pneumatic chip removal guns, hammers, ratchet wrenches, and sanders.

What is back to back pressure testing for hydraulic cylinders?

Hydraulic cylinders can be tested dynamically by connecting the test cylinder with a master cylinder mounted within a rigid frame structure. Usually the test cylinder is

operated with a hydraulic power source and the master cylinder is loaded with relief

and check valves connected to the ports.

Such back to back test loads the total cylinder components including the Rod, tube,

Gland ,seals ,mounting parts etc and can reveal many parameters which cannot be seen in the conventional end to end load test. Similar set up can be also used for

life cycle test extending to millions of full load cycles.

What is the function of pneumatics?

A: physics tells us that if a put 1lb of pressure here it will be 1 lb far away.

B: The function of pneumatics is to affect mechanical action by means of compressed gasses.