Hi all, I need to knock up a small , say 10 mm piston dia, hand operated force pump to do a hydraulic (water) test to around 15 psi ( but want it capable to at least 300 + psi ) Cyl / piston is the easy bit, but am looking for ideas for small non-return valves. My current lash-up uses top-hat poppets about 4 mm dia with o rings on mating to flat brass faces ( ends of air fittings ) with springs, work ok exept that the inlet one is a bit unreliable and sometimes makes it difficult to prime the pump.This current pump is a re-hash of a motor driven one I made for another job and worked ok then to 350 psi, but the slow & stop start hand operated action seems to be the problem. So any Ideas out there for small NR valves, I am trying to avoid lapping at this scale and want to make in S/S. Cheers, Mark. G.
- posted
17 years ago