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Thanks NickJ67, length isn't a problem, but agree that what I want seems really difficult to achieve. I'm thinking if there are some other options available, as this seems to be in the "too difficult" box.

Thanks Micalbrch, but I don't think they'll fit in 65mm diameter!

Having checked these out, it still looks like there are no solutions - diaphragm pumps from the referenced manufacturers are too large, but would be ideal if I could find one small enough. Plungers are a problem to drive efficiently by electric motor, and also a size issue. Looks like the...

Curtis26 - yes, the plunger pump looks good, but the size and supplier is an issue. Also driving it was another problem, as it needs a linear drive mechanism, causing a high loss of efficiency, and as we use batteries for the high current, this has not been overcome.

Hi, and thanks guys, for the comments. Micalbrch - I will check out the links. I thought PCP would be best due to the use of these pumps for lifting water in deep wells, but they are large diameter. The piston diaphragm pumps look very interesting if I cen find one small enough. Compositepro -...

I am looking for a high pressure (2000 psi), low rate (1.5 litres/min) water (brackish, possible small solids content) pump which has an overall diameter of 65mm or less (length not important, but ideally 3 metres or less), to operate at 120 deg C. Had no luck so far, except for a positive...

I am looking to buy a 3 inch fullbore swab valve (gate/knife or similar valve that can cut wire and still seal) for a geothermal well, with 7500 psi working pressure at 500 degF, prefer H2S service. Fluid is salt water with trace CO2 and CH4. Remote operation of the valve is required due to...