#pneumatic system

Pay attention to the relevant medium and working environment when using the pneumatic directional control valve

1 Air

The compressed air used in the system should be kept clean enough. For this reason, an air filter device of no more than 5 μm is often installed upstream of the reversing valve. When the air compressor system produces a lot of carbon powder, the carbon powder will adhere to the valve body of the directional valve, which will inevitably lead to the bad action of the valve. If necessary, an oil powder separator can be installed in the pipeline to separate oil powder, to reduce the harm caused by inferior oil mist to the entire pneumatic system.

2 Condensate

The condensed water should be removed in time to avoid poor component action or poor responsiveness. An automatic drain filter should be used in places where management is inconvenient. If the temperature of the environment and medium is lower than 5°C, a necessary dryer should be set up to ensure that the air provided for the system is sufficiently dry. Generally speaking, solenoid valves can be used in In a low-temperature environment (eg -10°C).

3 Lubricating

Some components have pre-lubricated characteristics before they are used, so such components can be used without oil. However, components without pre-lubrication characteristics should use appropriate lubricating measures as specified. Components that do not need oiling can also be lubricated. However, once such components are used like lubricating components, they must not stop oiling, otherwise, it is very easy to Lead to bad action of the pneumatic valve. When some lubricating oils work below 0 °C, their viscosity will increase significantly, which may lead to unexpected failures, and more attention should be paid.

4 Bad environment

It is necessary to avoid installing the valve in adverse environments, such as places where there are corrosive gases or chemical solutions and water vapor in the environment, and where the ambient temperature is higher than 60 °C. When it is determined that the pneumatic directional valve is used in an environment with water droplets or oil droplets, a drip-proof directional valve should be selected; when there is a lot of dust in the use environment, it is necessary to consider using a pneumatic directional control valve with dust-proof function as much as possible; When the valve is working, when there may be sparks splashing around (such as welding and other similar work), be sure to install a protective cover to prevent sparks from splashing on the directional valve for safety protection; when the environment is inflammable and explosive When it is dangerous or hidden, an explosion-proof pneumatic directional control valve should be used; because the pneumatic transmission system is noisy, a suitable muffler should be installed at the exhaust port of the system, which can not only reduce the discharge of oil mist but also reduce the noise. However, when the muffler is installed at the exhaust port, the back pressure will rise, so at this time, it is necessary to consider whether it affects the movement speed of the cylinder.

5 Organic solvents

If there is an organic solvent in the environment, pay attention to the problem that the organic solvent will damage the resin label and so on.

6 Ozone

If there is ozone, it may cause rubber cracks, air leakage, or poor operation on pneumatic components such as directional valves, etc., and may cause adjustment of adjustable components such as pressure-reducing valves and speed control valves.

Jiangsu Kerai Hydraulic Pump Co., Ltd. is a high-end equipment manufacturer specializing in the production of high-pressure plunger pumps, motors, hydraulic reducers, and spare parts.

If you have your own opinions on the hydraulic motor, please contact Jiangsu Kerai Hydraulic Pump Co, Ltd. We have pneumatic directional control valves for sale.

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Pneumatic transmission is a transmission method that is very similar to hydraulic transmission in the working principle. Because its working medium has many advantages such as clean and cheap, convenient access and handling, and low resistance to flow, the application of pneumatic transmission technology has become more and more extensive.

With the in-depth application of the pneumatic system, we have learned more about this fluid transmission technology, and also summed up some precautions in the use and maintenance of pneumatic directional control valves, hoping to provide a reference.

1 Requirement for connecting piping

(1) The hard pipe used for connection should be galvanized steel pipe with an anti-rust function. The length of the hose connected between the cylinder and the valve should be kept as short as possible, and the installation should be designed to avoid compromise.

(2) Before connecting the piping, clean up the debris, oil, and dust of various materials in the pipe. It is best to blow it off because when the piping is connected, there will be various debris (such as hidden in the pipe threads) and debris (such as sealing material) into the valve body. When sealing with sealing tape, a part of the length of the threaded end should be left unwrapped with the sealing tape. This length is about 1.5~2 threads, and the sealing tape should be wound in a clockwise direction.

(3) When installing the pipe joint on the reversing valve, care must be taken to ensure that the size of the pipe joint does not interfere with each other. The design of the piping system should take into account the easy disassembly, installation, and disassembly of the reversing valve in case of failure, that is, space for inspection, maintenance, and replacement of new valves should be reserved.

(4) Refer to the relevant information for the torque when installing the piping. The torque should not be too large to cause it to be over-tightened, otherwise, cracks will easily occur at the interface.

2 Other Notes

(1) When the directional valve used is a mechanical control type, it is necessary to pay attention to prevent overload, and not have any action beyond the limit position.

(2) If the electromagnetic directional valve is an internal pilot type, it should be noted that the inlet should not be throttled to prevent the occurrence of malfunction due to too large a pressure drop when the directional valve is reversed.

(3) When using a superimposed valve, pay attention to the back pressure that may cause some actuators to malfunction, especially when using a three-position mid-release pneumatic reversing valve and driving a single-acting cylinder. In this regard, if you are concerned about the possibility of malfunction, you can use a separate exhaust manifold, or use a separate exhaust baffle assembly to prevent adverse effects caused by back pressure.

(4) Maintenance and inspection are inevitably required during the use of the pneumatic system, so when using the pneumatic directional valve, it is necessary to fully consider whether the system can release residual pressure, especially the use of three-position middle-sealed reversing valves or aborted reversing valves. When reversing the valve, it must be considered that there is a way to release the residual pressure energy between the cylinder and the reversing valve.

(5) For the place used for blowing air, consider using a direct-acting electromagnetic directional valve or an external pilot-operated electromagnetic directional valve.

Jiangsu Kerai Hydraulic Pump Co., Ltd. is a high-end equipment manufacturer specializing in the production of high-pressure plunger pumps, motors, hydraulic reducers, and spare parts.

If you have your own opinions on the hydraulic motor, please contact Jiangsu Kerai Hydraulic Pump Co, Ltd.

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Pneumatic tube systems are rudimentary inventory in hospitals with more than 200 beds. Because they are the best solution when long distances need to be covered and when seconds count, for example during surgery, when a blood product or a sample result is needed urgently. Whether blood-, tissue, urine samples or medication – when speed is vital, the hospital tube system will transport items fast, safe and shock-free.

Patient registration and the ER, laboratory, surgery, blood bank or care wards, nurses’ rooms and the hospital’s pharmacy – the different areas in a hospital can all be connected to the pneumatic tube system with our choice of space-saving stations in modern designs.

We know that transporting samples requires special care. We developed leak-proof protective carriers and individually adjustable transport velocity especially for hospitals’ needs. Blood samples, for example, can be transported gently at a reduced speed.

The medical sector has to be profit-oriented and cost efficient just as any other industry. Hospitals often suffer from staff shortages. Our pneumatic tube systems increase your efficiency by saving money and time and by increasing productivity of your employees. And our systems offer a return on investment with an amortization of one to two years. Hospital employees will be relieved of time-consuming tasks. Instead of running errands they can concentrate on what is really important: Their patients.

 Pneumatic tube systems are used to transport materials safely and efficiently between two or more points. They are used in many industries and have a rich history.

Carriers are the capsules that actually travel through tubes. As their name suggests, they carry the material to be transported from point A to point B. Carriers come in varying sizes to accommodate different systems and industries. Leak-resistant and leak-proof carriers are ideal for hospitals and labs that need to transport sensitive liquid materials. Carriers are made of durable, transparent material and have secure but easy-to-operate closure flaps. The cushioned skirts on either end of the carrier allow it to move smoothly through tube systems and arrive at their destination safely.

Stations are the ports that send and receive carriers. They include docks to insert carriers and user interface panels to send them to the desired end-station. There are different types of stations depending on the needs of the system. A pneumatic system might have two stations, or it may have diverging paths that lead to several stations.

A diverter is used to create branching paths in a tube system. When a complex system requires multiple paths to and from a given station, a diverter is used at the intersection of those branching paths. The diverter changes the direction of the carriers as they pass through. The animation below shows how the diverter changes the direction of the carrier.

Blowers are the fans that cause the carriers to move through the pneumatic tubes. By creating a difference in air pressure between two ends of the system, the blower effectively

Sucks the carrier through the tubes. Carriers move through the system at speeds of around 25 feet per second. Blowers are powered by motors that switch on and off as needed to direct the tubes through the system.

Steps for Using a Pneumatic Tube System

1. Place the material into a carrier

2. Insert the carrier into a station

3. Use the station’s user interface to select a destination and send the carrier

4.  A blower activates, creating pressure that pulls the carrier through the tube system at speeds of 25 feet per second

5. A computerized system activates diverters as necessary, which direct the carrier on the proper path throughout the system

Automatic PVC Pipe Cutting Machine

By P Manikandan | K Krishnakanth | Prof P Mathan Kumar"Automatic PVC Pipe Cutting Machine" 

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, 

URL: http://www.ijtsrd.com/papers/ijtsrd10869.pdf  

http://www.ijtsrd.com/engineering/mechanical-engineering/10869/automatic-pvc-pipe-cutting-machine/p-manikandan

open access journal of chemistry, call for paper biological science, ugc approved journals for engineering

One of the few places in Manhattan which still employs a pneumatic system.

“When a young man in Manhattan writes a letter to his girl in Brooklyn, the love letter gets blown to her through a pneumatic tube–pfft–just like that.” — E.B. White, ‘Here Is New York’

The Pneumatic Tube system was once an essential part of New York life. Cylinders containing letters, packages, or at least in one case a…