Verder VA25 Air-Operated Double Diaphragm Pump

Overview

The Verder VA25 is a compact, high-efficiency air-operated double diaphragm (AODD) pump from the Verderair range, built with a 1 inch liquid connection and a 1/2 inch NPT air connection for medium-duty transfer, container emptying, and basic dosing duties. Available in metallic center-section construction (aluminium or conductive polypropylene) with a wide choice of diaphragm, valve seat, and ball materials including PTFE, Santoprene, Buna-N, Viton, and Hytrel, the Verder VA25 can be matched precisely to the chemical compatibility of the fluid being handled, from mild aqueous solutions to aggressive solvents and abrasive slurries.

Seven Star LLC supplies the Verder VA25 to industrial and process facilities across Oman, Muscat, Sohar, Salalah, and the wider GCC as an authorized partner for genuine Verder and Verderair pumps and spare parts. Every Verder VA25 shipped through Seven Star LLC is factory-sourced with full documentation and backed by local technical support, so maintenance teams in the Sultanate of Oman can select the correct wetted-part configuration and keep dosing and transfer stations running without downtime caused by mismatched materials or unsupported substitutes.

Operating Principle

The Verder VA25 uses two opposing flexible diaphragms connected by a shared shaft, driven by compressed air acting alternately on each diaphragm through a modular air valve. As one diaphragm is pushed forward on its discharge stroke, the shaft pulls the opposite diaphragm backward on its suction stroke, drawing fluid in through a check valve while the first side pushes fluid out through its own check valve; the air valve then reverses automatically once the stroke completes, giving continuous, self-priming pumping action with no rotating seals or packing glands in contact with the pumped fluid.

Because the Verder VA25 is driven entirely by compressed air rather than an electric motor, output flow and pressure are controlled simply by throttling the air supply, and the pump can be run against a closed discharge valve indefinitely without overheating or damage, stalling safely until the valve reopens. This same characteristic makes the Verder VA25 inherently dry-run safe, tolerant of cavitation, and suitable for installation in areas where running electrical power to a motor-driven pump would add cost or complexity.

Engineering Design

The Verder VA25 delivers a maximum flow of up to 49.9 GPM (189 L/min) and a maximum discharge and air input pressure of 124.7 PSI (8.6 bar), with a maximum solids particle size of 0.13 inch, dry suction lift of up to 16 feet, and wet suction lift of up to 28.9 feet, figures that cover the great majority of drum, IBC, and sump transfer duties encountered on Omani industrial sites. Maximum handled viscosity reaches 10,000 cPs and maximum fluid temperature 275 degF, depending on the diaphragm and seat elastomer selected, giving flexibility across chemical dosing, wastewater, and general process transfer applications.

Wetted parts on the metallic Verder VA25 are offered in aluminium or stainless steel, with the center section available in polypropylene, aluminium, or conductive polypropylene for installations that require static-dissipative construction. ATEX-certified variants are available for use in classified hazardous areas, using pneumatic actuation at the pump head rather than electrical power, which suits refineries, tank farms, and chemical storage areas across the GCC where ignition sources must be tightly controlled. The modular air valve design allows field-level rebuilds without special tooling, minimizing spare-parts holding and downtime.

Key Features

• 1 inch liquid connection with 1/2 inch NPT air connection, compact footprint
• Maximum flow up to 49.9 GPM (189 L/min) at up to 124.7 PSI (8.6 bar)
• Inherently dry-run safe with no mechanical seals or packing glands
• Self-priming with wet suction lift up to 28.9 feet
• Handles viscosities up to 10,000 cPs and solids up to 0.13 inch
• Metallic construction in aluminium or stainless steel wetted parts
• Wide elastomer choice: PTFE, Santoprene, Buna-N, Viton, Hytrel
• ATEX-certified variants available for classified hazardous areas

Industrial Applications

Across Oman’s industrial base, the Verder VA25 is applied to chemical dosing and transfer, wastewater and sludge handling, drum and IBC emptying, mining slurry transfer, and general fluid movement in food, pharmaceutical, and manufacturing plants wherever self-priming, low-shear, dry-run-safe operation is needed. Its ability to run indefinitely against a closed valve makes the Verder VA25 a practical choice for batch dosing stations and tank-changeover duties where flow may stop and start repeatedly through a shift.

As an authorized partner of Verder, Seven Star LLC positions the Verder VA25 for chemical processing, wastewater treatment, mining, and general industrial customers throughout Muscat, Sohar, Salalah, and the broader GCC, supplying genuine pumps alongside material-selection guidance so that new installations and pump replacements use correctly specified wetted parts rather than unsupported substitutes.

Technical Specifications

Get a Quote

Seven Star LLC is an authorized Verder partner supplying the Verder VA25 and the full Verderair diaphragm pump range across Oman, Muscat, Sohar, Salalah, and the GCC. Contact Seven Star LLC today for pricing, stock availability, and material-selection support on your Verder VA25 pump requirement.