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Thanks imok2 for a good sugestion. Thanks sterl. Metrex seems to have all the valves you can ever need. I apreciatte HVACR2 for his sugestion, but I do not know how to apply that. I think you are confused. The PM will control the refrigerant flow and what I want to control is the sea water...

To anyone working in Refrigeration or Air Conditioning I suggest to visit : http://www.et.dtu.dk/CoolPack/UK/index.html You will find incredible and complete software for all problems. Last time I visited it was all free download. Raegards

You should consider very closely the gasket situation described by ProfSporlan as it might be a big problem. Also consider that if you just change to R134a, the capacity of the compressors will be much lower. I undertand you do not want to change the compressors. You must check in manuals...

For a sea water R-22 condenser I need to find a presostatic flow control valve. There are several tahat work with fresh water, and the only one I know for sea water is about 1 1/2" inches. Too small. I need a flow of sea water about 48 m3/hr this is about 2 1/2" or 3" diameter...

Something else to consider: In direct DX expansion systems you only have one heat exchanger in the low side and it is the finned evaporator. It works with some temperature diference lets say 7ºC. So te suction temperature is 7ºC lower than the air being cooled (all depending on design). In...

Lukitorio: The answer of imok2 is very correct. Be also sure that all compressors are at the exact same hight. Not one compressor higher than another. The oil ecualization line should not rise over the level of the connection. I also suggest check valves after each oil separator. If nothing...