Dry suction height of pneumatic diaphragm pump
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The "maximum dry suction height" is often mentioned in the samples of pneumatic diaphragm pumps, but I think that in actual applications, this dry suction height seems to have no real value. I wonder if any friends know what the "maximum dry suction height" means? What's the use? Thanks!
The maximum self-priming height is also called the suction lift, which is the maximum height that the pump can automatically suck up water without water diversion (the vertical distance between the pump suction port and the liquid level to be pumped). This value of a diaphragm pump is often not the vertical height that can pump water when "the water inlet pipe is all air", but with water diversion. This suction lift is often related to the lift. The higher the suction lift, the greater the lift.
Dry suction is a very important indicator. When testing a diaphragm pump, if the suction lift height is higher than the dry suction height, it may be necessary to prime the pump to fill the pipe with liquid. The wet suction height of the diaphragm pump is very high. The suction lift of the PTFE polytetrafluoro diaphragm pump is lower than that of the rubber diaphragm. I remember that my company used a WILDEN pump with a suction lift of about 5 meters and a lift of 35 meters.
“"Maximum dry suction height" refers to the maximum suction lift of the pneumatic diaphragm pump. It is the height at which the pump can suck up water below the pump inlet and work when the maximum compressed air pressure (8bar) is given to the pump. The maximum suction lift of a pneumatic diaphragm pump is generally 7 meters. There are two very critical parameters here. One is the maximum compressed air pressure that needs to be given to the pump, and the other is that the medium is water. If the viscosity and specific gravity of the medium are different, the actual suction lift obtained will also be different. If the transported medium is volatile, the suction range will also be different. For example, if gasoline is transported, the suction range will not reach 7 meters. In addition, the suction lift will be different depending on the diaphragm material selected for the pump itself. If PTFE is used, the suction lift will be reduced by 1/3. If your pneumatic diaphragm pump is an imported product, they should provide you with a relationship curve between pressure, flow, and suction head. How high the suction lift your chosen pump can achieve can be found out through your process parameters and curves.