______ nozzles also called constant pressure nozzles, automatically vary the rate of flow to maintain an effective nozzle pressure.

______ nozzles also called constant pressure nozzles, automatically vary the rate of flow to maintain an effective nozzle pressure.

• A. Fog nozzles
• B. Automatic nozzles
• C. Rotary nozzles
• D. Piercing nozzles

Answer: (B)

Automatic nozzles, also called constant-pressure nozzles, keep nozzle pressure steady by automatically adjusting how much water they let through. Inside these nozzles is a small pressure-regulating mechanism, often a spring-loaded valve, that senses the pressure at the nozzle tip. When pump discharge pressure goes up, the mechanism partially closes to reduce flow and hold the nozzle pressure near the set value. When discharge pressure drops, it opens more to increase flow and again maintain that same nozzle pressure. This makes the spray pattern and reach more predictable across varying supply pressures and reduces the need for the operator to constantly tweak the flow. Fog nozzles can change patterns and flows, but they don’t inherently regulate nozzle pressure by automatic adjustment. Rotary nozzles rely on a rotating spray for coverage and don’t focus on maintaining a constant nozzle pressure. Piercing nozzles are designed for breaching surfaces, not for regulating nozzle pressure during water application.

Automatic nozzles, also called constant-pressure nozzles, keep nozzle pressure steady by automatically adjusting how much water they let through. Inside these nozzles is a small pressure-regulating mechanism, often a spring-loaded valve, that senses the pressure at the nozzle tip. When pump discharge pressure goes up, the mechanism partially closes to reduce flow and hold the nozzle pressure near the set value. When discharge pressure drops, it opens more to increase flow and again maintain that same nozzle pressure. This makes the spray pattern and reach more predictable across varying supply pressures and reduces the need for the operator to constantly tweak the flow.

Fog nozzles can change patterns and flows, but they don’t inherently regulate nozzle pressure by automatic adjustment. Rotary nozzles rely on a rotating spray for coverage and don’t focus on maintaining a constant nozzle pressure. Piercing nozzles are designed for breaching surfaces, not for regulating nozzle pressure during water application.