16 Questions
What method is used to control the compressor output by shutting down the compressor when little or no air is required by the system?
Start and stop control
Which type of compressor units can utilize the start and stop control method as described in the text?
Electric motor driven units
What should be done to prevent the compressor from continuously starting and stopping according to the text?
Install a sufficiently large receiver
How does the unloader protect the motor from overloading during the startup period?
By automatically unloading the compressor during startup
What happens to the unloader valve when the compressor reaches operating speed?
Automatically closes
What is the main function of the centrifugal type loader shown in Figure 12?
To unload the compressor when it stops
What is the purpose of the unloader valve in a reciprocating compressor system?
To reduce the pressure in the compressor discharge pipe to atmospheric pressure
In a load/unload control system, what does the pilot type unloader do?
Varies the output from the compressor according to air demand
How does the inlet valve unloader operate in a load/unload control system?
Closes the inlet valves completely
What method is used to adjust the compressor speed according to system demand?
Variable Speed Control
When does the pressure-actuated control slow down the driving engine or turbine in a variable speed control system?
When system demand for air increases
What happens in dual capacity control when a compressor runs a set time without loading?
It shuts down
What is one function of protective controls in a compressor system?
To protect the compressor from damage or catastrophic failure
How does an inlet valve unloader operate in a reciprocating compressor system?
By making the inlet valve completely ineffective when unloaded
In what situation does dual control shut down a compressor in a reciprocating system?
When it runs without any loading.
What does an inlet valve unloader do when operating due to decreased air pressure in a reciprocating compressor system?
It retracts and allows inlet valve plates to seat again.
Test your knowledge on compressor control methods such as start and stop control, load/unload control, dual control, variable speed control, and constant speed control. Learn how each method varies the compressor output to suit load requirements and maintain a constant pressure in the system.
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