Dilution Solutions Nutrient Delivery System (NDS) Water Hammer Arrestor Kit, 1 1/2 in

Water Hammer Arrestor Kit for 1-1/2 Inch Hi-Flo NDS – WHA150-SS-KIT

The Dilution Solutions WHA150-SS-KIT is the water hammer arrestor kit for 1-1/2-inch Hi-Flo Nutrient Delivery System installations. Water hammer is the pressure shockwave created in a pipe when a fast-closing valve abruptly stops water flow — solenoid valves and ball valves closing quickly in an irrigation system are common causes. These shockwaves can stress fittings, damage Dosatron injectors, and loosen connections over time.

The WHA150-SS-KIT installs inline in the 1-1/2-inch NDS and absorbs these pressure shockwaves before they can damage system components. The kit includes all the plumbing hardware needed for installation: water hammer arrestor, tee, 4-inch nipple, elbow, close nipple, union, and a roll of pink Teflon tape. Assembly is required.

Key Features & Benefits

• Stops Water Hammer — Absorbs pressure shockwaves from fast-closing valves to protect NDS components.
• 1-1/2-Inch Hi-Flo System — Sized for 1-1/2-inch Hi-Flo NDS installations.
• Complete Installation Kit — Includes arrestor, tee, nipples, elbow, union, and Teflon tape.
• Protects Dosatron Injectors — Pressure shockwaves can damage precision injector internals — the arrestor prevents shockwave propagation.
• Protects Fittings and Connections — Repeated water hammer can loosen threaded connections and stress fittings over time.
• Assembly Required — Field assembly of all components is required during installation.

Who Should Use This Kit

The WHA150-SS-KIT is a standard component of a complete 1-1/2-inch Hi-Flo NDS installation. It is particularly important in facilities where automated solenoid valves control irrigation zones, as solenoids close faster than manual valves and generate larger pressure transients.

Understanding Water Hammer in Irrigation Systems

Water hammer occurs when moving water is suddenly stopped or redirected. In a pipe, water moving at a given flow rate has kinetic energy — when a valve closes rapidly, that kinetic energy converts to a pressure wave that travels backward through the pipe at the speed of sound in water. In high-pressure or high-flow systems, this pressure spike can be many times the normal operating pressure. A water hammer arrestor is a device with a piston and an air or nitrogen charge that compresses when the pressure wave arrives, absorbing the shockwave energy and preventing it from traveling through the rest of the system.

Frequently Asked Questions

What does the WHA150-SS-KIT include?

Water hammer arrestor, tee, 4-inch nipple, elbow, close nipple, union, and roll of pink Teflon tape.

Why is a water hammer arrestor needed in an NDS?

Fast-closing valves in irrigation systems create pressure shockwaves that can damage Dosatron injector internals and loosen fittings over time. The arrestor absorbs these shockwaves.

Where in the NDS does the water hammer arrestor install?

The arrestor installs inline in the NDS — typically at a branch tee in the main line where shockwaves would propagate from closing irrigation zone valves back toward the injectors.

Is there a 3/4-inch version?

Yes. The WHA34-SS-KIT (DSWHAK34) is the 3/4-inch Lo-Flo equivalent.

Is assembly required?

Yes. Assembly of all components is required during installation.