Grundfos DDE Pumps
Spare Parts for DDE Range Pumps
Product Summary
Genuine and compatible spare parts for the Grundfos SMART Digital DDE speed-controlled diaphragm dosing pump, used across Australia for chlorination, pH correction and set-and-forget chemical dosing in water treatment, pools, irrigation and industry. Every DDE from the 6 l/h DDE 6-10 to the 200 l/h DDE 200-4 uses the SMART Digital dosing head build (diaphragm, suction and discharge valves, deaeration valve), so tick what you need and we’ll match the exact kit to your nameplate (e.g. DDE 6-10 PR-PVC/T/C-F-31U2U2IG).
Spare Parts List
✓ Tick the parts you need. Grundfos SMART Digital kits are matched to the dosing head material and pump size, so your nameplate model is all we need to get them right. Not sure which items? Add a photo of the nameplate and we’ll work out the kit for you.
| Select | Wear / Service Item | Function & when to replace |
|---|---|---|
| Common Service Kits | ||
| Spare Parts Kit | The standard service kit: suction and discharge valves, diaphragm and O-rings, matched to your head material, gasket and valve ball codes. Fit it at the routine service interval or whenever output drops off. | |
| Diaphragm Kit | Replacement diaphragm sized to your pump (44 to 117 mm across the range). Replace if chemical shows at the drain hole or at the service interval. | |
| Valve Kit | Complete suction and discharge valves with balls, seats and seals, standard or spring-loaded. The usual fix for lost prime, back-flow or inaccurate dosing. | |
| Complete Dosing Head | Fully assembled dosing head for your model, with valves, diaphragm and deaeration valve. The quickest fix for a cracked, chemically attacked or heavily scaled head. | |
| Deaeration Valve | Manual deaeration (vent) valve for priming and releasing gas from the head. Replace if it weeps or will not seal. | |
| Other Core Parts | ||
| Injection Unit | Spring-loaded injection unit at the dosing point, keeping chemical from back-flowing. Replace if scaled, blocked or leaking. | |
| Foot Valve | Foot valve with strainer for the end of the suction line: no-level for B pumps, low-level and empty-tank sensing for PR and AR pumps. | |
| Suction / Discharge Tubing | Suction, discharge and deaeration tubing sized to your pump connections (e.g. 4/6, 6/9, 9/12 or 19/27 mm). | |
| Pressure Relief / Loading Valve | Pressure relief valve to protect the pump and line from over-pressure, or a pressure loading valve to hold a steady counter pressure and stop siphoning. | |
| Pulsation Damper | Smooths the discharge flow on longer lines and reduces pressure peaks, most useful on the larger DDE 60–200 sizes. | |
| Connection Kit / Inlays | Union nuts, hose or pipe inlays and clamps for the pump inlet and outlet, matched to your connection code. | |
| Signal & Power Cables | Level input, pulse/analogue, relay output and mains cables with the correct plugs for PR and AR pumps. | |
| Complete Replacement Pump | When a repair doesn’t stack up, we quote a like-for-like SMART Digital DDE from the model on your nameplate. | |
How we confirm the exact part: SMART Digital DDE kits depend on pump size, dosing head material, gasket, valve ball and valve type. Your nameplate carries all of it in the type key (e.g. DDE 6-10 PR-PVC/T/C-F-31U2U2IG: PVC head, T = PTFE gaskets, C = ceramic balls, 1 = standard valves). Tick the items above and add a nameplate photo, and we’ll confirm the correct part and price for your exact pump.
Models
Spare parts are available for every SMART Digital DDE size in the current Grundfos Australia range. The first number on your nameplate (e.g. DDE 60-10) is the maximum flow in l/h; the second is the maximum pressure in bar.
Models & Key Specifications
| Model | Max flow (l/h) | Max pressure (bar) | Diaphragm (mm) | Control (AU range) |
|---|---|---|---|---|
| DDE 6-10 | 6 | 10 | 44 | B or PR |
| DDE 15-4 | 15 | 4 | 50 | B or PR |
| DDE 60-10 | 60 | 10 | 74 | B or AR |
| DDE 120-7 | 120 | 7 | 97 | B or AR |
| DDE 200-4 | 200 | 4 | 117 | B or AR |
B = manual only; PR = manual and pulse with remote on/off, level inputs and alarm relay; AR (XL) = manual, pulse and 4–20 mA with level inputs, analogue and relay outputs. AU range dosing heads: PVC with PTFE gaskets and ceramic balls. DDE 6–15 (SMART Digital S): G5/8 connections, 17 W. DDE 60–200 (SMART Digital XL): G5/4 connections, 80 W. IP65.
Troubleshooting
Pump runs but does not dose
Likely cause: air in the dosing head, a dry or blocked foot valve, worn or dirty suction/discharge valves, or a blocked injection unit. Action: open the deaeration valve and prime the pump; clean the foot valve strainer; check the injection unit for scale or crystallised chemical; if output does not return, fit the valve kit.
Air lock or gassing (sodium hypochlorite, peroxide)
Likely cause: outgassing chemical collecting in the dosing head, often worse with long or warm suction lines. Action: keep the suction line short and below the tank where possible, use the deaeration valve with a return line to the tank, and fit spring-loaded valves for gassing media.
Chemical at the drain hole (diaphragm leak)
Likely cause: a ruptured or fatigued diaphragm. Action: isolate the pump, flush the dosing head and replace the diaphragm, or fit the full spare parts kit. Do not keep running: chemical can reach the drive behind the diaphragm.
Pump stalls or knocks against high pressure
Likely cause: a closed or blocked discharge line, a seized injection unit, or a system pressure above the pump rating. Action: check discharge valves are open, clean or replace the injection unit, and confirm the counter pressure suits the model. Fit a pressure relief valve if one is missing.
Dosing rate inaccurate or drifting
Likely cause: worn valve balls and seats, too little pressure difference across the head (a pressure loading valve may be needed), siphoning, or a calibration that no longer matches site conditions. Action: fit the valve kit, check the pressure differential and recalibrate the pump.
Leaking at the dosing head or connections
Likely cause: loose dosing head screws, perished O-rings, or connection nuts and inlays damaged by over-tightening. Action: fit the spare parts kit (valves, diaphragm and O-rings), torque the head screws evenly and replace damaged connection parts.
No power, no display or alarm relay active
Likely cause: supply fault, a damaged mains or signal cable, or a fault in the drive or electronics. Action: check the supply and cables; note any alarm shown on the display. A drive or electronics fault usually means a replacement drive or pump, so send us the nameplate model and alarm details.
Request for Quotation
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Not sure which parts? Just send a photo of the nameplate or part below.