WP-ARO / WP-ARO GmbH industrial pumps and fluid equipment

Industrial pumps by WP-ARO and WP-ARO GmbH: EXP and PRO pneumatic double diaphragm pumps, EVO electric process units, and AFX heavy-duty piston pumps deliver reliable transfer of viscous and chemical fluids.

WP-ARO EXP Series pneumatic double diaphragm pumps

Air-operated double diaphragm pumps of the EXP series engineered by WP-ARO GmbH deliver dependable transfer of aggressive, viscous, and abrasive industrial fluids. The unbalanced pneumatic spool valve eliminates stall conditions under irregular compressed air supply pressure.

Metallic fluid pump variants constructed with aluminum and stainless steel housings
Non-metallic chemical pumps configured with polypropylene and PVDF fluid chambers
Long-life PTFE composite diaphragms engineered for intensive non-stop industrial cycles
Electronic interface options enabling closed-loop connection to supervisory automation

WP-ARO PRO Series industrial air diaphragm pumps

The classic PRO series air-operated diaphragm pump line from WP-ARO GmbH provides steady displacement of slurries, industrial solvents, and coating mixtures. The streamlined bolt-down body design allows rapid maintenance inspection without disconnecting manifold plumbing.

Compact pump body sizes ranging from one-quarter inch up to three inches manifold width
Check valve balls and seat rings fabricated from stainless steel, polyurethane, and NBR
Pneumatic air distribution sections engineered for low compressed air consumption
Explosion-proof fluid section engineering suitable for handling flammable compounds

WP-ARO EVO Series electric process diaphragm pumps

The modern EVO series from WP-ARO GmbH combines key advantages of diaphragm pumps with the superior energy efficiency of direct electric drives. Operating without compressed air lowers utility costs while enabling precise variable flow control through an electric drive motor.

Integrated high-torque electric drive capable of holding line pressure at zero velocity
Hermetically sealed process fluid chamber completely free of dynamic shaft seals
Built-in digital control interface monitoring pressure parameters and pumping speed
Instant thermal and hydraulic protection against sudden closed-discharge overpressure

WP-ARO AFX and N Series industrial piston pumps

Industrial piston pump systems of the AFX and N lines from WP-ARO GmbH are engineered for transfer and high-pressure extrusion of high-viscosity adhesives, sealants, mastics, and silicones. High hydraulic fluid ratios develop intense discharge pressures required by automated applicators.

Versatile pump configurations featuring two-ball and four-ball fluid intake valves
Extrusion ram assemblies with follower plates for emptying standard industrial drums
Hard-chrome plated fluid plunger rods resisting abrasive mechanical wear and gouging
Pneumatic drive motors equipped with silencers and anti-icing exhaust ventilation

WP-ARO MPD, SB pulsation dampeners and drum pumps

Automatic pulsation dampeners of the MPD and SB families paired with WP-ARO GmbH drum pump systems eliminate hydraulic shocks and flow surges in discharge lines. These units shield delicate flow meters, inline instrumentation, and flexible transfer hoses from cyclic impulse fatigue.

Automatic air charge compensation adjusting internal pressure to dynamic line changes
Dampener body components molded in polypropylene, conductive acetal, and stainless steel
Immersion drum pump tubes engineered for emptying barrels, containers, and IBC totes
Effective suppression of fluid line vibration and pipe hammering in production areas

WP-ARO service repair kits, diaphragms, and valves

Comprehensive maintenance kits and replacement wear parts from WP-ARO GmbH are matched for scheduled rebuilding of both fluid and air distribution sections. Installing structured service kits restores nominal pumping head, factory displacement rates, and hermetic fluid isolation.

Diaphragm kits fabricated from PTFE, Santoprene, Hytrel, and oil-resistant NBR polymer
Valve service packages containing precision check balls, matching valve seats, and O-rings
Pneumatic air end rebuilding kits including directional spools, dynamic seals, and gaskets
Exact dimensional tolerance matching ensuring smooth and prompt equipment reassembly

Kinematic design and pneumatic air distribution in EXP diaphragm pumps

In WP-ARO EXP Series industrial double diaphragm pumps, fluid displacement is driven by the reciprocating movement of two flexible membranes coupled through a rigid central rod.

The pneumatic directional spool valve utilizes composite ceramic sliding surfaces that function reliably without auxiliary airline lubrication.

This unbalanced spool geometry prevents stalled valve positions even during compressed air supply pressure drops below two bar or during gradual motor throttling.

Smooth redirection of pressurized air reduces discharge pulse spikes and protects diaphragm membranes from structural fatigue during round-the-clock plant pumping cycles.

Elastomer diaphragm material selection for chemical and abrasive resistance

Operational reliability of a WP-ARO GmbH diaphragm pump depends on matching membrane elastomers and valve seating components to fluid chemical properties.

For handling strong mineral acids, caustic bases, and aggressive organic solvents, multi-layer diaphragms fabricated from modified PTFE with Santoprene backer layers are recommended.

In abrasive mineral slurries, ceramic slips, and thick mining tailings, thermoplastic Hytrel and polyurethane membranes exhibit superior mechanical wear durability. For petroleum products and fuel oils, NBR nitrile polymers deliver proven sealing capability.

Proper elastomer specification eliminates membrane swelling and mechanical rupturing.

Energy efficiency and precise closed-loop control of EVO electric pumps

The modern EVO pump series from WP-ARO pairs the positive displacement advantages of diaphragm pumps with the high energetic efficiency of direct electromechanical drives.

Unlike conventional pneumatic units that consume plant compressed air, EVO pumps feature a permanent-magnet synchronous motor governed by an onboard variable frequency inverter.

This architecture enables smooth displacement regulation across wide speed ranges, automated batch dosing, and stable discharge head maintenance.

When fluid discharge valves shut down unexpectedly, the digital drive holds target system pressure without winding overheating and without inline relief dumping.

High-pressure extrusion of viscous sealants and adhesives via AFX piston pumps

Pumping high-viscosity pastes, polyurethane mastics, structural sealants, and industrial silicones demands severe discharge fluid pressure reaching hundreds of bar.

Industrial piston pump systems of the WP-ARO AFX and N series produce high hydraulic fluid intensification via area differentials between the air motor piston and fluid plunger rod.

Assemblies are mounted onto heavy-duty single-post or dual-post ram lifts with follower plates that seal against material inside standard two-hundred-liter shipping drums. The bottom intake foot valve drives non-flowing compounds into the fluid cylinder, eliminating cavitation breaks.

Elimination of flow surges and hydraulic hammer via active MPD pulsation dampeners

The pulsating discharge pattern inherent to reciprocating diaphragm pumps creates pressure fluctuations and inline hydraulic shock waves capable of damaging downstream flow meters and pipe fittings.

Automatic pulsation dampeners of the WP-ARO MPD series provide active damping of dynamic shock surges through a flexible separator diaphragm and a pressurized pneumatic surge dome. An internal air regulator continuously tracks average line pressure and tunes the pneumatic air cushion automatically.

This eliminates up to ninety-five percent of pipeline pulsation, lowering structural vibration on pipe bridges.

Preventive maintenance procedures and scheduled rebuilding of pump fluid sections

Trouble-free service life of WP-ARO GmbH pumping equipment is maintained through routine preventive inspections and timely renewal of mechanical wear parts. Standard servicing encompasses scheduled visual review of diaphragm sheets, check valve balls, sealing seat rings, and fluid chamber O-rings.

Worn valve seats or deformed balls decrease volumetric displacement rates and reduce dry suction lift capacity. To minimize maintenance downtime, pre-packaged overhaul service kits provide all required dynamic seals, elastomer diaphragms, and calibrated hardware to restore full pumping performance.

WP-ARO / WP-ARO GmbH and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of WP-ARO / WP-ARO GmbH and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.