I'm looking for a source for spring loaded check valves with a cracking pressure less than 5" WC (0.18 psi) for nitrogen service. 316SS/PTFE construction will suffice. Temperature is 0 - 40C. Sizes could range from 1/4" tubing to NPS 2 Cl 150 flanged.Forged Steel Valves So far the lowest CP I've found is 1/3 psi. Below link to a datasheet from a well renowned disc check producer, Flowserve, Gestra (with variation on other product and material qualities from the same producer),Hydraulic control valves could be a possible match to your question and anyway one of the best possible on the market. Competitors/other suppliers exist.Water Control valves Note the difference in cracking pressure depending on size, flow and mounting direction. I would not go for your suggestion in this case, both because of the low-temperature requirement, and that nitrogen in my opinion should have a more active closure than gravity alone.Cast Gate, Globe, Check Valves In addition a gravity based ball check-valve is slow, and might under circumstances give higher loss under opening or part opening and/or high pressure peaks when closing.Forged Gate, Globe, Check Valves Cleaned gas free of particles is presumed. Take a look at the Checkall poppet types, as low as 1/8 psi cracking pressure, depending on seat material.

MORE NEWS