Verderair VA double diaphragm pump accessories

Needle valves

To regulate the speed of an air operated diaphragm pump it is recommended to use a needle valve in the air supply to the pump. With this valve you can regulate the volume of air which is supplied to the pump, but is not limiting the pressure. So the pump will have full power available to move the fluid, only the speed of the pumping action will be regulated.

Pressure regulators

When the full air pressure is not necessary in your pumping application, you can use an air pressure regulator in the compressed air supply to the pump. By changing the pressure of the supplied air to the pump, you will change the working curve. At applications where a pump will stall against a closed discharge line, you will need less volume of air by setting the air-pressure regulators at the correct pressure level.

Oil water filters

Because of the working principle of an air operated diaphragm pump, compressed air will be decompressed inside the pump. By physical law, this will generate a cooling effect. When the supplied air is having a too high % of humidity, this will generate condensate. This condensate can damage the air-valve of the pump or by lower temperatures even create ice-forming at the muffler. By using an oil/water filter in the air line close to the pump, this can be limited.  

Stroke counters

By applying a stroke counter a double diaphragm pump can be used for dosing applications. A REED switch will detect the strokes and give the signal to a controlling unit. This can be connected to a display to indicate the number of strokes or can be connected to for example a PLC to stop the pump automatically after a programmed number of strokes.