. Principles and practice of plumbing . Digitized by Microsoft® 184 Principles and Practice of Plumbing a pressure of 100 pounds per square inch in the servicepipe, c, the valve, a, will seat when the pressure in d exceeds25 pounds. This is owing to the greater area in b, whichcompensates for the greater pressure acting on the small area of a. That is, 26pounds pressure persquare inch acting onfour square inches ofdisk will equal 104pounds pressure, enoughto close the valveagainst 100 poundspressure only on a1-inch surface. Thepressure in d at whichthe valve seats, or inother words, the amount
. Principles and practice of plumbing . Digitized by Microsoft® 184 Principles and Practice of Plumbing a pressure of 100 pounds per square inch in the servicepipe, c, the valve, a, will seat when the pressure in d exceeds25 pounds. This is owing to the greater area in b, whichcompensates for the greater pressure acting on the small area of a. That is, 26pounds pressure persquare inch acting onfour square inches ofdisk will equal 104pounds pressure, enoughto close the valveagainst 100 poundspressure only on a1-inch surface. Thepressure in d at whichthe valve seats, or inother words, the amountof pressure to be car-ried in the water sup-ply system, can be reg-ulated by adjusting thefulcrum, e. Moving itto the right will in-crease and moving it to the left will decrease the pressurein the system. A sectional illustration of a pressure regulator exten-sively used in practice is shown in Fig. 94. In this regu-. Fig. 92Self-Closlng Cock
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