Dilution Solutions Nutrient Delivery System (NDS) Water Hammer Arrestor Kit, 3/4 in

Water Hammer Arrestor Kit for 3/4 Inch Lo-Flo NDS – WHA34-SS-KIT

The Dilution Solutions WHA34-SS-KIT is the water hammer arrestor kit for 3/4-inch Lo-Flo Nutrient Delivery System installations. Water hammer is the pressure shockwave created when fast-closing valves — particularly solenoid irrigation zone valves — abruptly stop water flow in a pipe. These shockwaves stress fittings, can damage Dosatron injector internals, and loosen threaded connections in the NDS over time.

The WHA34-SS-KIT installs inline in the 3/4-inch NDS and absorbs pressure shockwaves at the point where they would otherwise propagate back toward the injectors. The kit includes all the plumbing hardware needed: 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 Lo-Flo NDS components.
• 3/4-Inch Lo-Flo System — Sized for 3/4-inch Lo-Flo NDS installations.
• Complete Installation Kit — Includes arrestor, tee, nipples, elbow, union, and Teflon tape.
• Protects Dosatron Injectors — Prevents pressure transients from damaging precision proportioning injector internals.
• Protects Fittings and Connections — Repeated shockwaves loosen threaded connections — the arrestor prevents damage before it accumulates.
• Assembly Required — Field assembly of all components is required during installation.

Who Should Use This Kit

The WHA34-SS-KIT is a standard component in a complete 3/4-inch Lo-Flo NDS installation. It is especially important for facilities with multiple automated irrigation zones controlled by solenoid valves, where frequent and rapid valve closure generates regular pressure transients in the supply line.

How a Water Hammer Arrestor Works

A water hammer arrestor contains an internal piston backed by a sealed air or nitrogen charge. When installed in a pipe branch, the arrestor is exposed to line pressure. When a pressure shockwave arrives from a fast-closing valve, the wave pressure exceeds the normal line pressure and pushes the piston inward against the gas charge, compressing it. The gas charge absorbs the shockwave energy as it compresses, then pushes the piston back to the resting position as the transient passes. This action eliminates the pressure spike before it can travel upstream to the Dosatron injectors or downstream to the irrigation distribution system.

Frequently Asked Questions

What does the WHA34-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 part of the NDS?

Solenoid irrigation valves close quickly, generating pressure shockwaves that can damage Dosatron injectors and loosen fittings over time. The arrestor absorbs these shockwaves.

Is there a 1-1/2-inch version?

Yes. The WHA150-SS-KIT (DSWHAK1.5) is the 1-1/2-inch Hi-Flo equivalent.

Is assembly required?

Yes. Assembly of all components is required during installation.

How does the water hammer arrestor work?

The arrestor has an internal piston backed by a compressed gas charge. When a pressure shockwave arrives, it compresses the gas, absorbing the spike energy before it can propagate through the system.