vane compressors

Question 1

vane compressors are used to deliver air at lower pressures and low to medium volumes at ?

Answer 1

100-110 psi
600-3000cfm

Question 2

how can you obtain higher psi with van compressors

Answer 2

using multiple stages

Question 3

true or false vane compressors can be designed to be oil free or oil flooded ?

Answer 3

true

Question 4

what stage units can achieve very close to a perfect vacume of 29.94 inches hg

Answer 4

the three stage

Question 5

sliding vane compressors are often single staged true or false ?

Answer 5

false they are often double staged

Question 6

what is the main rotating part on a rotary vane ?

Answer 6

the rotor

Question 7

how is the compressor capacity determined

Answer 7

calculating the volume of air between two sets of vanes at Max volume. multiplied by the number of vanes multiples by the rpm of motor

Question 8

what prevents high pressure discharge air from leaking into the low pressure intake area ?

Answer 8

centrifugal force on the vanes

Question 11

What type of compressor requires the vanes to be made from a special material with a low coefficient of friction such as Teflon or graphite?

Answer 11

Sliding vane compressor

These materials help reduce wear and improve efficiency.

Question 12

What type of compressor is flooded with oil all the time it is running?

Answer 12

Wet vane compressor

This design helps with lubrication and sealing.

Question 13

How do vane compressor systems often eliminate the need for an air receiver?

Answer 13

Using inlet throttle control system

This allows for better control of air delivery.

Question 14

What is the only major moving part in a sliding vane compressor?

Answer 14

Rotor

The rotor spins to create air compression.

Question 15

What does it mean for a compressor to have a built-in pressure ratio?

Answer 15

Ratio not adjustable as in reciprocating compressors

This limits flexibility in pressure settings.

Question 16

What prevents the high-pressure discharge air from leaking back into the low pressure suction area in a vane compressor?

Answer 16

Centrifugal force along with an oil seal on vanes

This mechanism helps maintain efficient operation.

Question 17

How is compressor capacity determined on a vane compressor?

Answer 17

Calculating the volume of air between two sets of vanes multiplied by the number of vanes multiplied by the RPM of the motor

This formula provides a measure of the compressor’s output.

Question 18

Why do non-lubricated vane designs generally produce air at low pressures?

Answer 18

They cannot sustain the high temperatures

Lack of lubrication leads to overheating and limits performance.

Question 19

What is the purpose of the oil in a wet vane compressor?

Answer 19

Seal, lubricate, prevent corrosion, operate servo valve

Oil plays multiple critical roles in maintaining compressor function.

Question 20

What is the principle involved with designing a vane compressor system without an air receiver?

Answer 20

The air pressure produced inside the casing is used to control the portion of the inlet unloader valve which matches compressor output to system requirements.

This principle helps in optimizing compressor performance without necessitating an air receiver.

Question 21

On a wet vane compressor, what part gets rid of the majority of the oil as soon as it passes through the discharge port on the stator?

Answer 21

Labyrinth seal.

The labyrinth seal plays a crucial role in separating oil from the discharged air.

Question 22

Which valve on a wet vane ensures that the oil circulation system is satisfied first before the compressor sends any air to the system?

Answer 22

Minimum pressure valve located on compressor discharge.

This valve prioritizes oil circulation to maintain lubrication before air delivery.

Question 23

Under what conditions does the minimum pressure valve remain open?

Answer 23

As long as the system remains above 60psi.

The valve’s function is critical for maintaining operational pressure.

Question 24

How is the reverse flow of air, along with condensed water vapor and other contaminants, prevented from entering the compressor?

Answer 24

Check valve on the discharge line. ## Footnote Larger compressors typically have a check valve to prevent backflow.

Question 25

On the wet vane, which valve is normally open on start-up and which is normally closed?

Answer 25

Unloader is normally open and servo is closed. ## Footnote This configuration is essential for proper compressor start-up.

Question 26

Why must you have a good seal on the vanes while they rotate and compress air?

Answer 26

So the air can't leak back. ## Footnote A proper seal is vital for maintaining efficiency in the compression process.

Question 27

Within a wet vane compressor, why must you remove the oil vapor while the air/oil mixture is still quite warm?

Answer 27

Vapor could condense and contaminate. ## Footnote Removing oil vapor promptly prevents contamination of the compressed air.

Question 28

What is the purpose of the oil relief valve?

Answer 28

To prevent hydraulic lock or overpressure. ## Footnote Hydraulic lock occurs when liquid prevents the engine from turning, and overpressure can lead to system failure.

Question 29

What is the purpose of the oil bypass valve on a compressor system?

Answer 29

Stops oil from going to the cooler and warms it up quicker to proper temperature. ## Footnote This ensures the compressor operates efficiently by maintaining optimal oil temperature.

Question 30

Why does a safety relief valve need to be installed on the casing of the wet vane compressor?

Answer 30

To prevent the compressor from blowing apart if the minimum pressure valve were to fail. ## Footnote A safety relief valve helps maintain safe operating conditions.

Question 31

Which valve could cause high-pressure air to leak into lower pressure areas of the compressor?

Answer 31

Oil relief valve if not seated properly. ## Footnote Proper sealing of the oil relief valve is crucial to prevent inefficiencies in the compressor system.

Question 32

What happens if the inlet unloader is stuck in the closed position?

Answer 32

No air could be delivered. ## Footnote This can lead to compressor inefficiency and potential damage.