. Principles and practice of plumbing . Fig. 92Self-Closlng Cock. Fig. 93Pressure Eegulator lator two pistons, called cups, of different areas are usedinstead of the two distance valves in the former operation of the valve is as follows: When water isadmitted to the pressure side of the regulator, it passes Digitized by Microsoft® Principles and Practice of Plumbing 185 through the valve port and fills the system of piping on thehouse side; as soon as the system of piping is filled, the backpressure acts on the upper cup and tends to raise the stemand thus close the valve. As
. Principles and practice of plumbing . Fig. 92Self-Closlng Cock. Fig. 93Pressure Eegulator lator two pistons, called cups, of different areas are usedinstead of the two distance valves in the former operation of the valve is as follows: When water isadmitted to the pressure side of the regulator, it passes Digitized by Microsoft® Principles and Practice of Plumbing 185 through the valve port and fills the system of piping on thehouse side; as soon as the system of piping is filled, the backpressure acts on the upper cup and tends to raise the stemand thus close the valve. As the area of the upper cup isgreater than that of the lower cup, a less pressure persquare inch is required on the low-pressure side to exceedthe pressure exerted on the lower cup on the high-pressureside; consequently, when the pressure on the house side^exceeds a certain percentage of the street pressure, thevalve will close. As soon as a faucet on the house side ofthe regulator is opened, it lowers thepressure on that side, and the high-pressure acting on th
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