What type of valve uses flexible, chemical-resistant, rubber-type diaphragms to control flow?
A. Plug
B. Ball
C. Diaphragm
D. Butterfly
A. Incorrect. A plug valve uses a flow control element shaped like a hollowed-out plug, attached to an external handle, to control flow.
B. Incorrect. A ball valve is a device that uses a flow control element shaped like a hollowed-out ball, attached to an external handle, to control flow.
C. Correct. Diaphragm valves use flexible, chemical-resistant, rubber-type diaphragms to control flow.
D. Incorrect. A butterfly valve uses a disc-shaped flow control element to control flow.
You might also like to view...
What protections does the Electronic Communications Protection Act provide? What exceptions are allowed for under this act?
What will be an ideal response?
If sales at your company are doubling every five years, what is the annual rate of increase? What annual rate of increase would be necessary for sales to double in four years? Three years?
What will be an ideal response?
All of the following statements about rotor refinishing are true EXCEPT:
A. for cuts greater than 0.015 inch, take two or more shallow cuts rather than one deep cut. B. the first cut should only be a portion of the total anticipated depth of cut. C. the finishing cut removes more metal than the rough cut. D. areas not touched by the cutting bits will be darker than those that have been touched.
The sides of a regular heptagonare equal. If the length of each side is expressed as 4.2H + 2, what is the perimeter of the heptagon in terms of H.
What will be an ideal response?