Genuine-quality air valves and repair kits for ARO, Wilden, Sandpiper, Graco and 12+ brands - sourced and supplied across India by Bonzer Marketeers.
The air valve — also called the air distribution system — is the heart of every Air Operated Double Diaphragm (AODD) pump. It receives compressed air at the inlet and directs it alternately behind each diaphragm, creating the back-and-forth motion that moves your process fluid. Without a properly functioning air valve, the pump stalls, cycles erratically, or refuses to start entirely.
Air valves on AODD pumps are positioned centrally between the two diaphragms. This placement minimises dead volumes and air path lengths, improving efficiency and response time. Depending on the OEM design, the air valve may be internal (housed within the pump body) or external (bolt-on, easier to service in the field). Both designs offer proven reliability when maintained with quality replacement parts.
Air valve bodies are manufactured from a range of materials including aluminium, brass, engineered plastics, and stainless steel — chosen to match the pump's intended application and process environment.
Bonzer Marketeers stocks a comprehensive range of AODD pump air valve parts and complete assemblies compatible with all leading pump brands. Our supply includes:
Drop-in replacement air valve units for fast pump restoration with zero guesswork on part compatibility.
Most PopularKits containing all internal wear parts — O-rings, U-cup seals, gaskets, and sliding spool components — for a full air-end overhaul.
Full RebuildStandalone seals, gaskets, and O-rings in BUNA, PTFE, EPDM and other elastomers to suit your fluid and temperature conditions.
BUNA · PTFE · EPDMPilot valve parts for pump models that use an auxiliary pilot valve alongside the main air valve assembly.
All parts are OEM-compatible — manufactured to match original specifications for fit, form, and function.
OEM-MatchedAir valves on AODD pumps are generally maintenance-free under clean compressed air conditions. When service is required, keep these guidelines in mind.
For critical processes, many plant engineers stock a complete spare air valve assembly. This allows immediate swap-out during failure diagnosis, minimising downtime.
Air valve servicing requires specific tools and reassembly torques. Incorrect assembly can damage the valve body or introduce new leakage points.
Dirty compressed air is the leading cause of air valve wear. A 5-micron inline filter upstream of the pump dramatically extends air valve service life.
Include air valve inspection in your preventive maintenance schedule.
When your AODD pump stops unexpectedly, the air valve is one of the first places to investigate. Here are the most common air-end issues and what they usually indicate
Stuck or seized air valve spool due to contaminated air supply. Install an inline filter and replace worn spool seals.
Worn O-rings or U-cup seals cause internal air leakage and inconsistent shift timing. An air-side repair kit resolves this in most cases.
Check for process medium contamination — a sign of diaphragm failure. Both the diaphragm and air valve assembly may need replacing.
Excessive moisture in compressed air supply. A fresh, well-seating air valve with intact seals reduces air consumption and minimises icing.
Internal air valve leakage from degraded seals or a worn spool body. Inspect and rebuild with an OEM-compatible repair kit.
Never use solvent-based cleaners such as WD-40 on air valve components. These solvents degrade lube-free seals and O-rings, causing accelerated failure. Use only manufacturer-approved cleaning agents during servicing.
The air valve directs compressed air alternately behind each diaphragm, creating the alternating pressure that drives the pumping action. It is the central control component on the air side of the pump.
Common signs include the pump stalling mid-cycle, erratic or irregular cycling, failure to start, increased air consumption, or icing at the exhaust port. A worn air valve is typically the cause of air-end failures once dirty air and diaphragm issues are ruled out.
Yes. Bonzer Marketeers supplies OEM-compatible air valve assemblies and repair kits for ARO, Wilden, Sandpiper, Graco, Yamada and many other AODD pump brands across India. Contact us with your pump model number for a quote.
Air-side repair kits typically contain all internal wear parts: O-rings, U-cup seals, spool seals, gaskets, and relevant hardware. Kits allow a complete air valve rebuild without replacing the entire valve body.
No. Solvent-based products like WD-40 degrade the lube-free seals inside AODD air valves. Use only manufacturer-approved lubricants or dry assembly as specified in the service manual.
Yes. We stock parts compatible with both internal and external air valve configurations depending on the pump OEM and model.
Share your pump details — we'll match the exact part you need.
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