Which of the following statement(s) is (are) true about cylinder ...

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Which of the following statement(s) is (are) true about cylinder valves?
 
  1. Diaphragm valves can withstand pressure greater than 1500 psig.
  2. Direct-acting valves are used for pressure less than 1500 psig.
  3. Diaphragm valves should be used with flammable gases.
  4. Leakage cannot occur with direct-acting valves.
  a. 3 c. 2 and 3
  b. 1 d. 1 and 4

Question 2

Which of the following statement(s) is (are) true about diaphragm type of valves?
 
  1. A partial rotation of a diaphragm type of valve will not open the stem.
  2. The valve seat in a diaphragm type of valve does not turn.
  3. The diaphragm type of valve contains two fiber washers.
  4. The diaphragm type of valve uses a threaded stem.
  a. 2 c. 3 and 4
  b. 1 and 4 d. 2 and 4

[LegendaryAnswers]

Answer to Question 1

ANS: A
Diaphragm valves can withstand pressures less than 1500 psig and should be used with flamma-ble gases because they do not allow leaks. A direct-acting valve contains two washers and a Tef-lon packing to prevent gas leakage around the threads.

Answer to Question 2

ANS: D
The valve seat does not turn and is therefore resistant to scoring; it also uses a threaded stem in place of the packing found on the direct-acting valves. The direct-acting valve has two fiber washers.

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[LegendaryAnswers]

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