Hardie HD-6100 Valve Replacement: Rebuild vs. Replace

Replacing control valves on a Hardie HD-6100 system: you can almost always rebuild (swap internals) rather than replace the entire valve body, saving labor and pipe work.

Rebuild Compatibility

• Most major brands (Rain Bird, Toro, Irritrol, Hunter) use standardized diaphragm/solenoid sizes within each valve series.
• Identify your valve model (stamped on body).
• Buy diaphragm + solenoid kit for that exact model.

Recommended Valve for Full Replacement

If body is cracked or you prefer new: Rain Bird DV-100F (1" female thread, flow control). Professional grade, widely available, parts supported for decades. Bush down to ¾" if needed.

Rebuild Steps

1. Shut off water; relieve pressure.
2. Remove solenoid (unscrew).
3. Remove bonnet screws; lift off top.
4. Swap diaphragm; clean seat.
5. Reinstall bonnet; torque screws evenly.
6. Install new solenoid; connect wires.
7. Turn water on; check for leaks.

Why Name Brands Matter

Rain Bird, Toro, Hunter maintain parts compatibility for 20+ years. Cheap brands (Orbit, store brands) often change designs, making future repairs impossible.