Wilden High Pressure AODD Pumps
Spare Parts for High Pressure AODD Pumps
Spare Parts List
Models & Applications
The Wilden® High Pressure range is a series of pressure-boosting AODD pumps that intensify discharge pressure to as much as 20.7 bar (300 psig) without external boosters. The Duplex models (H220 1", H800 2", H1500 3") use a power piston for a 3:1 pressure ratio; the Simplex HS430S (1-1/2") delivers a 2:1 ratio. All use the robust Chem-Fuse™ Integral Piston Diaphragm designed for high pressure.
Pressure-boosting AODD to 20.7 bar (300 psig). Duplex 3:1 (H220, H800, H1500) & Simplex 2:1 (HS430S). Chem-Fuse IPD. Diaphragms, valve balls and valve seats come in a full range of materials — rubber (Buna-N, Neoprene, EPDM, FKM/Viton®, Bunalast™), TPE (Wil-Flex™/Santoprene®, Saniflex™, polyurethane) and PTFE (full- or reduced-stroke, with a back-up diaphragm). Integral Piston Diaphragms — Chem-Fuse™ (industrial) and Pure-Fuse™ (hygienic) — remove the outer piston for longer life. We match every wetted part to your fluid, temperature and duty.
Typical applications: Filter-press feed, chemical sludge & solid-laden slurry, viscous product transfer and long high-friction piping runs.
Spare Parts
Tick the parts you need and send the request — we identify the exact genuine Wilden part for your pump build from your model & serial. Wear & consumable parts are listed first; most are supplied as genuine wet and air repair kits.
| Select | Qty | Part | Notes |
|---|---|---|---|
| Wear & Consumable Parts | |||
| 1 | Diaphragms (set of 2) — specify material | Primary wear item | |
| 1 | Back-up Diaphragm (set of 2) | Used behind PTFE diaphragms | |
| 1 | Valve Balls (set of 4) — specify material | Check-valve balls | |
| 1 | Valve Seats (set of 4) — specify material | Check-valve seats | |
| 1 | Valve Seat O-rings | Seat seals (PTFE-fitted builds) | |
| Air Distribution System (ADS) | |||
| 1 | Air Valve Assembly (unbalanced spool) | Non-stalling air valve | |
| 1 | Pilot Spool / Centre Block | Signal valve | |
| 1 | Air Valve End Caps, Snap Rings & Cap O-rings | Air-valve seal set | |
| 1 | Air Valve Gasket & Screen | Air-valve seals / inlet screen | |
| 1 | Muffler | Exhaust silencer | |
| Centre Section & Drive | |||
| 1 | Diaphragm Shaft | Reciprocating centre shaft | |
| 1 | Integral Piston Diaphragm design | One-piece — no outer piston to wear | |
| 1 | Centre Block Glyd™ Rings & Block Gasket | Centre-section seals | |
| 1 | Air Chambers | Air-side housings | |
| Wet End | |||
| 1 | Liquid Chambers | Specify wetted material | |
| 1 | Discharge Manifold | Specify wetted material & port | |
| 1 | Inlet Manifold / Housing | Specify wetted material & port | |
| 1 | Bolt / Fastener Set | Bolted builds | |
| 1 | O-ring & Gasket Set | Manifold & chamber seals | |
| Service Kits | |||
| 1 | Wet (Fluid) Repair Kit | Diaphragms + balls + seats + O-rings | |
| 1 | Air Repair Kit | Air valve + pilot/centre-block spool + seals | |
| 1 | Power Piston (Duplex 3:1) / Simplex Chamber Parts | High-pressure intensifier parts | |
| 1 | Chem-Fuse™ Integral Piston Diaphragm (set) | High-pressure IPD wear item | |
| 1 | Retrofit Kit | Upgrade an existing pump to genuine Wilden parts | |
Troubleshooting Guide
Pump Will Not Start or Cycle
Likely Cause: No air supply, a closed air valve, an iced-up or stalled air-valve spool, or a blocked muffler.
Action / Part: Confirm air supply and pressure; open the air valve; thaw / clear or replace the air-valve spool and pilot; clear or replace the muffler.
Pump Cycles But No or Low Flow
Likely Cause: Worn or ruptured diaphragms, worn or stuck valve balls & seats, a closed suction valve, or an air lock.
Action / Part: Replace the diaphragms and the valve balls & seats; open the suction valve and prime; check the suction line for air leaks.
Product in the Exhaust Air / Muffler
Likely Cause: A ruptured diaphragm venting product to the air side (Wil-Gard™ detects this).
Action / Part: Replace both diaphragms and inspect the shaft; confirm the diaphragm plates / IPDs are torqued to spec.
Pump Stalls or Ices Up
Likely Cause: Moisture in the air freezing the air valve, low air pressure, or a worn centre-block / pilot spool and Glyd™ rings.
Action / Part: Fit an air dryer / filter; raise air pressure within rating; rebuild the air end (air kit) — spool, Glyd rings, gaskets.
Air Bubbles in the Discharge
Likely Cause: A loose or worn diaphragm / piston, or loose manifold bolts or clamp bands.
Action / Part: Replace / re-torque the diaphragm and pistons; re-torque manifold bolts and clamp bands; renew seals.
Short Diaphragm Life / Excessive Air Use
Likely Cause: Operating above rated pressure, chemical attack on the elastomer, or cavitation.
Action / Part: Keep air & fluid pressures within rating; confirm the diaphragm / ball / seat material suits the fluid; reduce speed and improve suction to avoid cavitation.
Leak at the Manifold or Wet End
Likely Cause: Worn O-rings / gaskets, worn valve seats, or loose fasteners / clamp bands.
Action / Part: Fit the wet repair kit (seats, O-rings, gaskets); re-torque manifold bolts / sanitary clamps to spec.
Request for Quotation
Selected Parts:
- No parts selected
Not sure which parts? Just send a photo of the nameplate or part below.