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
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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