NPA-50 Series  is an integrated model made by combining a pressure reducing valve, a pressure gage, and a constant flow valve with PA Series to have a feature of keeping a constant flow all the time even with the pressure change inside the piping.

This is suitable for measurement of both liquids and gases, capable of high precision control, and superbly convenient in handling due to the panel being integrated. The connection section has pipe thread and it can be selectively made as single or double depending on the number of flow meters to be installed onto the panel.​