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.Reducing Valves 316SS/PTFE construction will suffice. Temperature is 0 - 40C. Sizes could range from 1/4" tubing to NPS 2 Cl 150 flanged.So far the lowest CP I've found is 1/3 psi. Suggestion: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), could be a possible match to your question and anyway one of the best possible on the market.Competitors/other suppliers exist.Filters Note the difference in cracking pressure depending on size, flow and mounting direction.comment to Compositepro : I would not go for your suggestion in this case, both because of the low-temperature requirement, Forged Steel Valvesand that nitrogen in my opinion should have a more active closure than gravity alone.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.API Cast Steel ValvesCleaned gas free of particles is presumed. Thanks for your advice.Compositepro - I'm looking into the duckbill type.Water power control valvesMoltenmetal - the 100 series Circle Seal valve is an excellent recommendation - if I can get it in the right material. Although their website lists 316SS, my local contact says it's only available in brass. I will persue at the factory level.ianinuts and ApC2KP - I am looking at Generant and Checkall as well.Again, my sincere appreciation for taking your time to help. And I'm still open for suggestions .

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