Air Driven Pump, air inlet port

Pump speed (flow) will be reduced and maximum pressure will not be achieved or at least not as quickly.

I'm not a pneumatics guy, but maybe you could feed a receiver from the compressor outlet, with a ³/₄" connection on to the pump? Can anyone advise? Maybe we'd need to know the pump requirements (volume of air required @ 7 bar), and also what the compressor can deliver @ 7 bar??

Its probable that your looking at too small of an air compressor.

You may be able to use the compressor with the 1/4" port. Depends on what your pumping and I doubt the pump has the CFM to keep up. If the compressor only has a 1/4" out put then it is too small. It will run the pump but it will not run it fast.

If the port size is any indication I would guess your pump needs 50-70 CFM to operate properly which means you are going to need an air compressor of some size. Plus as a general rule you want your air line from the compressor to be at least the same as the pumps port size but needs to be larger if you are using the same air supply for other things such as another pump. Then the main line needs to preferrably much larger.

The fastest way to get the right answer though is to look up the reqirements for the specific pump then contact a company that manufactures air compressors and get their recomendations.

As a matter of economical competitive design, mftrs of compressors and pumps provide ports of a minimum size that just matched the rated air flow - if that.

Thus a 3/4" inlet to the pump suggests an air flow far in excess of a compressor with a 1/4" outlet.

But in your case it might work if the pump only runs infrequently and you fit a receiver large enough to run the pump for the duration. If so you can then connect the two with a suitable adapter - using 3/4" pipe.

At the worst the pump will run too slow.

As others have said - you need to find out from the mftrs the rated pressure and flow of the pump - then select a compressor that has a rated output to match it - then connect the two with a pipe sized to carry the rated flow for the length you need.

But beware, if the pipe diameter is too small you will get serious pressure loss and you will be back where you started.

Very simple my friend . install a holding tank between the compressor and the pump the compressor or multiple compressors can charge the tank to create a large volume of air to serve the pump requirements .

Hopefully the pump requires only intermittent use and this system will work for your application.

Obviously if the pump needs to constantly run the only option will be to have available air to run it three compressors @ 1/4" tied to the tank will approximately equal to 3/4" power.

Try a simple test to run your application tapping into your existing compressor with a 3/4" port and see how long it takes to deplete the tank .

I think your talking of a diaphragm pump. The 7 bar (101 psi) is max rating, seems flow gets these things going. You can use your existing air line coming from your receiver of the compressor to your pump with a 3/4" adaptor. Pump will not run as fast as you will like with the amount of flow with the small hose but it will work. Make sure you have a regulator in the line as most compressors have high limits at 9-10 bar and these pumps don't like the high pressure on the diaphragm.

The air driven pump like a compressor shall be specified by its need of air flow rate (CFM or m³/hr) at the specified pressure. The specs. of compressor must cover those needs.

The easier solution is to connect the pump to the compressor with outlet port 1/4" using an adapter and take care with any changes and see what will happen.