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Self venting pump

Without knowing exactly how the pump "self vents" it is difficult to know if a standard pump would work, though I suspect it would. All you might need to do is when changing the water container, unplug the pump from the caravan, and drop the disconnected pump into the container to allow the water to remove any air locks in the pump before reconnecting it to the caravan.

My suspicion is the self venting pump, has a small vent hole in the extra section that allows any trapped air in the pump to escape as the water rises through the pump. Either their is some sort of float valve that closes the vent when water has reached the top of the pump, or the flow through the vent is so small it passes air easily but its much more of a restriction to water and it barely detracts from the pumps ability pressure rise the water in the pipe.
 
Hello Grey

I know that brochures such a the Comet one don't always show each possible variation of a pump in a picture, but having looked through the catalogue non of them look the same as JT's model with the additional component on the water outlet.

Also just becasue it appears in a catalogue does not necessarily mean it's stocked or even available in the UK to retail purchasers.
 
Those pumps are available in the UK and I found the air release adaptor on ebay for £3.99 next day delivery.
 
It might be worth considering going to a pressurised system, provided the taps do seal properly when closed, then fitting a pressure switch and non return valve (most caravan pressure switches have a never built in) to the pump outflow simplifies the system and provides a higher current rated single switch that will handle a more powerful pump.

You could also consider an onboard diaphragm pump, which has both pressure switch and never built in. The down side is they are noiser than the comet type pump, and can cause vibration which can be amplified buy the caravan body which can be annoying.
 
ProfJohnL said:
It might be worth considering going to a pressurised system, provided the taps do seal properly when closed, then fitting a pressure switch and non return valve (most caravan pressure switches have a never built in) to the pump outflow simplifies the system and provides a higher current rated single switch that will handle a more powerful pump.

You could also consider an onboard diaphragm pump, which has both pressure switch and never built in. The down side is they are noiser than the comet type pump, and can cause vibration which can be amplified buy the caravan body which can be annoying.
Click to expand...

Agree with your comments on the diaphragm pumps. Ours delivers a very good output but is located under the front bed. During daytime no problem but at night when someone washes their hands in the toilet the pump vibrates and is noisy. A poor design overall exacerbated by its location. Again designers probably don’t use their products.
 
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