What causes a pop up riser to rise?

What causes a pop up riser to rise?

• A. Suction
• B. Electric current
• C. Timer
• D. Water pressure

Answer: (D)

Water pressure is what makes a pop-up riser rise. When a zone valve opens, pressurized water pushes up on an internal piston or shaft inside the riser, lifting the sprinkler head above the soil. The rising action is a purely hydraulic effect—the force comes from the water pressure in the line, not from electricity or timing. Once the water is off and pressure drops, a spring and gravity pull the head back down. Electricity may operate the valve or the solenoid, but the actual lift comes from the water pressure.

Water pressure is what makes a pop-up riser rise. When a zone valve opens, pressurized water pushes up on an internal piston or shaft inside the riser, lifting the sprinkler head above the soil. The rising action is a purely hydraulic effect—the force comes from the water pressure in the line, not from electricity or timing. Once the water is off and pressure drops, a spring and gravity pull the head back down. Electricity may operate the valve or the solenoid, but the actual lift comes from the water pressure.