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
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.
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