VERDERAIR PURE VA-P40 Chemical Diaphragm Pump

Overview

The VERDERAIR VA-P40 is a 1 1/2 inch air-operated double diaphragm pump from the Verderair PURE range, designed for heavy-duty operation with harsh chemicals and severe process conditions. Verder lists power stations, acids, solvents, petrochemical facilities and photovoltaic panel manufacturing among its typical uses. The pump body is machined from a solid block of virgin-grade UHMW polyethylene or PTFE, so there are no welds and no metal in the wetted path or on the outside of the pump. The VERDERAIR VA-P40 delivers up to 370 l/min at a maximum operating pressure of 7 bar and passes solids up to 9 mm.

Seven Star LLC supplies the VERDERAIR VA-P40 to chemical plants, power and desalination stations, refineries and water treatment facilities in Oman and the GCC, with engineering support in Muscat. Our engineers help customers in Muscat, Sohar, Duqm and Salalah choose between PE and PTFE housings, conductive versions for hazardous areas, and the right valve and diaphragm combination for each acid, alkali or solvent.

Operating Principle

Like every AODD pump, the VERDERAIR VA-P40 uses two diaphragms connected by a shaft. Compressed air alternately pressurises the back of each diaphragm, so one chamber discharges liquid through its outlet check valve while the opposite chamber draws liquid in through its inlet check valve. The air valve reverses the cycle at the end of every stroke, giving a positive displacement flow that is controlled simply by adjusting air pressure and volume. In the PURE range this air valve is 100% oil and grease free, so it is suited to clean processes and leaves no lubricant in the exhaust.

The principle gives the VERDERAIR VA-P40 several advantages in chemical service. There is no rotating shaft seal to leak aggressive media, the pump can run dry and can stall against a closed valve without damage, and without an electric motor it is safe in zones where flammable solvents are handled. The datasheet gives a dry suction lift of 4 m with ball valves (5 m with the cylinder valve option) and a wet suction lift of 9.5 m, which allows the pump to draw from below-ground tanks and drums.

Engineering Design of the VERDERAIR VA-P40

The main differentiator of the PURE series is construction. Instead of injection moulding or welding plastic parts, Verder machines the housing and centre section of the VERDERAIR VA-P40 from one solid block. Machined housings have no weld lines or moulding stress points, which gives better resistance to mechanical forces, pressure cycling and temperature changes than welded designs. Housing and centre section options are EE (UHMW PE), GG (conductive UHMW PE), TT (PTFE) and UU (conductive PTFE). The PE versions are rated to 70°C and weigh about 39 kg (EE) or 36 kg (GG), while the PTFE versions are rated to 120°C and weigh about 87 kg (TT) or 82 kg (UU).

Valve balls are EPDM, PTFE or a cylinder valve, diaphragms are EPDM or PTFE overmolded, and fluid connections are 1 1/2 inch NPT female, flanged DIN DN40, flanged ANSI 1 1/2 inch or flanged JIS 1 1/2 inch, with an R 1/2 inch air inlet. Options include remote operation, pulsation dampener preparation, vertical suction, a barrier system with sensors, leak detection, stroke sensor, manual or pneumatic draining and ANSI preparation. The VERDERAIR VA-P40 carries ATEX marking II 2GD c IIB Tx.

Key Features

The VERDERAIR VA-P40 is built for chemical duties where metal pumps corrode and welded plastic pumps crack. Its key features are:

• Housing machined from a solid block of virgin UHMW PE or PTFE, with no welds and no metal wetted or external parts.
• Flow up to 370 l/min and maximum operating pressure of 7 bar with 1 1/2 inch or DN40 connections.
• PTFE versions rated to 120°C for hot acids and solvents; PE versions rated to 70°C.
• 100% oil and grease free air valve, suitable for clean and high-purity processes.
• Conductive PE and PTFE versions for ATEX hazardous areas (II 2GD c IIB Tx).
• Passes solids up to 9 mm, with wet suction lift up to 9.5 m.
• Can run dry and stall safely against a closed valve, with no rotating seal to leak.
• Options for leak detection, barrier system, stroke sensing and draining to support safe maintenance.

Industrial Applications

The VERDERAIR VA-P40 is used for unloading and transferring sulphuric, hydrochloric, nitric and hydrofluoric acids, caustic soda, sodium hypochlorite, ferric chloride and solvents. Power stations use the VERDERAIR VA-P40 in water treatment and demineralisation plants, petrochemical facilities use them for chemical additive transfer, and electronics and solar panel manufacturers rely on the metal-free, oil-free construction to protect product purity. Because the pump is portable and air driven, it is also used for emptying IBCs and storage tanks during maintenance.

In Oman and the GCC, Seven Star LLC supplies the VERDERAIR VA-P40 to desalination and RO plants, power stations, refineries and chemical storage terminals in Sohar, Duqm and Salalah. For metallic transfer duties with fuels and oils, the Verder VA25 air-operated double diaphragm pump is often the more economical choice, while low-flow chemical dosing usually calls for a Grundfos DME digital dosing pump or a Verderflex Rapide peristaltic hose pump. Our Muscat team can help compare the options.

Technical Specifications

The VERDERAIR VA-P40 technical data below comes from the Verder technosheet and product page.

How to Order

To receive a quotation for the VERDERAIR VA-P40, send Seven Star LLC the chemical name and concentration, temperature, flow, discharge pressure and area classification. We will confirm the PE or PTFE housing and valve materials, share the Verder technosheet available for download on this page, and arrange delivery from Muscat to sites across Oman and the GCC with spare diaphragm and valve kits.