Pocket-sized pump ideal for corrosive liquids
A
Pump Engineering product story
Edited by the Engineeringtalk editorial team
Jul 10, 2002
The Pageboy SFD15 self-priming diaphragm pump is ideally suited to pumping aggressive or corrosive liquids, such as solvents or strong acids.
The Pageboy SFD15 self-priming diaphragm pump is 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 safe to use in hazardous areas.
An important feature of the SFD pump is 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 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 falls, such as when a valve is opened.
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.
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 litre/min and maximum pressure of 6bar.
Air supply required is 80-100lb/in2, and air consumption is approximately 0.5ft3/min.
A choice of body materials include polypropylene, PTFE, stainless steel or aluminium, the diaphragm is made from PTFE, with seals to suit application.
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