Pneumatics Flashcards

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1
Q

What components does a typical pneumatic system have?

A

Compressor, receivers, filters, pressure regulators, lubricator so, muffler, dryer, actuator, control valve, and conductors

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2
Q

Where should the air intake be located?

A

In the coolest place possible

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3
Q

What is the air receivers purpose?

A

To compensate for fluctuations in demand, and to dampen pulsations

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4
Q

What things must every receiver have?

A

Gauge, drain, pressure relief valve

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5
Q

What must the pressure relief valve be set at?

A

Must be set no higher than the lowest maximum pressure rating of any part in the system

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6
Q

How should safety relief valves be mounted, and why?

A

Vertically, usually on top, to prevent dirt and sludge from blocking them.

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7
Q

What are the three types of commonly used pipe systems?

A
  • The grid (dead end) system
  • Decentralized system (unit system)
  • Loop system
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8
Q

What is the preferred or recommended piping system?

A

The loop system

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9
Q

Describe the grid, or dead end system of piping

A

It is the simplest, only requires one compressor, usually starts with a larger diameter supply line that gradually decreases. One drawback, is that systems at the end of the line could face air starvation when upstream demand is heavy

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10
Q

Describe the decentralized (unit) system

A

It is composed of two or more compressors each with their own grid. The grids may or may not be interconnected. Its advantage of this is each compressor is close to its point of use which means there is less pressure drop and more uniform supply and pressure

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11
Q

Describe the loop system of piping

A

Two or more compressors feed into the same loop allowing compressed air to flow in either direction

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12
Q

What materials are typically used for piping?

A

Plastic, brass, copper, aluminum, because they are all non corrosive. Black pipe is still commonly used due to its cost, but it is prone to rusting and scaling

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13
Q

What is a FRL unit ?

A

Filter, regulator, lubricator. They are installed in this order, and are often symbolized as a single valve in a drawing called a simplified air service unit

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14
Q

What are filters typically protecting from?

A

Contaminants from construction/assembly, oil and wear particles, pipe scale and rust.

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15
Q

How do you tell if an inline filter becomes plugged?

A

With gauges on either side you can see a pressure drop across the filter

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16
Q

Describe regulators

A

Different components require different pressures, and usually the supply from the compressor is too high. It is piloted downstream, with a gauge so proper pressure can be set.

17
Q

What does the exhaust air contain?

A

It usually contains oil in the form of mists and vapours

18
Q

Where is an oil lubricator located?

A

They are located close to the device that requires it. They are not transported all through the lines

19
Q

What are some guidelines when dealing with oil in a pneumatic system

A

Prevent compressor oil from entering the airstream, put lubricator so close to the component they will lubricate

20
Q

When does moisture fall out of compressed air?

A

When the dew point is reached

21
Q

Describe a lubricator symbol

A

Diamond shape with a small line coming from the top point

22
Q

Describe a compressor symbol

A

Circle with a triangle pointing outward, and triangle is not coloured in

23
Q

Describe a water separator symbol

A

Diamond shape with a horizontal line across the bottom

24
Q

Describe a filter symbol

A

Diamond shape with dashed vertical line

25
Q

Describe a simplified air service unit symbol

A

A box with (in order) filter dashed line, gauge symbol for regulator, small solid line from top for lubricator.
This is a typical FRL unit

26
Q

What is a common dcv for pneumatics?

A

5/3

27
Q

Describe the ways in a 5/3 dcv

A

The out ports are similar to an A and B like hydraulics the bottom three, the middle is your pressure or supply line, and either side is exhaust

28
Q

Describe an exhaust port symbol

A

A small triangle on the outside of s box