What makes the main valve in the reversing valve shift from one side to the other?
A) An electronic stepper motor mounted on one end of the reversing valve
B) Pressure difference from one side of the valve to the other
C) A solenoid coil creates a magnetic field that pulls the valve to one end and repels it to the other.
D) A small gear motor that is operated on 24 V engages gears on the back of the valve core.
B
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Why is it important to spray flowers that are dried using the desiccant drying method with a dried flower preservative?
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As a result of the conquest of the eastern Mediterranean, new ideas and cultural influences came to Italy, including
a. Greek learning. b. mystery religions from Spain. c. Chinese cultural practices. d. agricultural practices from Gaul.
To avoid system breakdown due to the failure of components that have a predictable service life, it is wise to:
A) Schedule parts replacements for wear items near the end of their service life. B) Install another backup system which can be quickly brought online. C) Not purchase any equipment that has parts that can wear out. D) Always use pulleys that have two belts.