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Author Question: What must be done to a wafer-lug butterfly valve prior to installation? a. Lubricate the shaft. ... (Read 70 times)

cookcarl

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on: Jul 24, 2018
What must be done to a wafer-lug butterfly valve prior to installation?
 
  a. Lubricate the shaft.
  b. Open the valve.
  c. Close the valve.
  d. Align the flanges.

Question 2

What is the purpose of wearing rings on a centrifugal pump?
 
  a. Prevents fluid leakage
  b. Increases compression ratio
  c. Allows fluid leakage
  d. Prolongs bearing life


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yifu223

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Reply #1 on: Jul 24, 2018
Answer to Question 1

b

Answer to Question 2

c


cookcarl

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Reply 2 on: Jul 24, 2018
Wow, this really help

bigsis44

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Reply 3 on: Yesterday
Gracias!

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