... is reached.Sclater Chapter 11 5/3/01 1:16 PM Page 384 CHAPTER 11 PNEUMATIC AND HYDRAULIC MACHINE AND MECHANISMCONTROLSclater Chapter 11 5/3/01 1:15 PM Page 369370DESIGNS AND OPERATING PRINCIPLES ... fired; then it releases instantly.Sclater Chapter 11 5/3/01 1:17 PM Page 403372These pumps are used to transfer liquids and semisolids, pump vacuums, and boost oil pressure9. ORIGINALLY DESIGNED ... steel, monel, and bronze for handling acids, oils, and sol-vents. The impeller is made of pressure-vulcanized laminated layers of Hycar, 85 to90 percent hard. Sand, grit, scale and fibrous materials...