Pocket sized pump for corrosive liquids

Citation

(2003), "Pocket sized pump for corrosive liquids", Anti-Corrosion Methods and Materials, Vol. 50 No. 1. https://doi.org/10.1108/acmm.2003.12850aad.006

Pocket sized pump for corrosive liquids

Pocket sized pump for corrosive liquids

Keywords: Pumps, Liquids, Corrosion

The Pageboy SFD15 self-priming diaphragm pump is believed to be ideally suited to pumping aggressive or corrosive liquids, such as solvents or strong acids. Available from liquids handling specialists Pump Engineering, this pocket sized, air-operated pump has low air consumption and is stated by the manufacturers to be safe to use in hazardous areas (Plate 4).

An important feature of the SFD pump is said to be a stress-free diaphragm which plays an important part in the pumps reliability and long-life, even when pumping liquids such as MEK, acetone or chloroform. The pump is reportedly designed to stop automatically against a closed valve, maintaining a delivery line pressure equal to the air supply pressure and starts automatically when the delivery line pressure fails, such as when a valve is opened.

Plate 4 Pocket sized pump is ideal for corrosive liquids – pump engineering

The pump consists of a chamber which is divided into two compartments by a diaphragm. One chamber is the pneumatic pressure/vacuum chamber, the other is the pump chamber. Compressed air enters through a venturi which reduces pressure in the pressure/vacuum chamber causing the diaphragm to move away from the pump chamber (the suction stroke).

The diaphragm pushes the control rod until the poppet valve closes the air exhaust port. As the pressure rises in the pressure/vacuum chamber the diaphragm is forced into the pump chamber (the delivery stroke), during which the diaphragm pulls the control rod off its seat. This allows air through the venturi causing the suction stroke to be repeated.

According to Pump Engineering because the diaphragm is used simply to separate the air from the liquid, it operates without stress which ensures high reliability, particularly when compared to other types of diaphragm pump.

The SFD 15 pump is designed for vertical upward flow and can be mounted by the extended tie rods supplied. It has a maximum output of 3 l/min and maximum pressure of 6 bar. Air supply required is 80-100 psi and air consumption is approx 0.5 cfm.

A choice of body materials include polypropylene, PTFE, stainless steel or aluminium, the diaphragm is made from PTFE, with seals to suit application.

Details available from: Pump Engineering Ltd, Tel: +44 (0)1903 730900; Fax: +44 (0)1903 730234.