Which of the following is (are) a small nebulizer compressor(s)? 1. Diaphragm 2. Liquid air 3. Rotary 4. Piston

a. 4 c. 1 and 2
b. 1 d. 1, 3, and 4

ANS: B
A flexible diaphragm is attached to a piston to compress gas. As the piston moves down, the di-aphragm is bent outward and gas is drawn through a one-way valve into the cylinder. Upward movement of the piston forces the gas out of the cylinder through a separate one-way outflow valve. Examples of diaphragm compressors are the Air Shields Diapump and the DeVilbiss small nebulizer compressor.