NP Series of Single Circuit Non-Pressurized Flow Centers

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Geo-Flo’s NP Series non-pressurized flow centers are the only non-pressurized flow centers in the industry that provide a truly closed-loop system with controlled pressure and vacu um relief and incorporate 3-way valves for system flushing. The pressure relief valve allows the system to be pressurized to 13 PSIG, which no other non-pressurized product can claim. This is important since geothermal HDPE loop pipe contracts when the system is in heating mode increasing system pressure. Further, our NP products include a vacuum relief valve (built into the cap) that is closed during normal operation, but opens when the system pressure drops below atmospheric pressure. This is important since the loop pipe expands during cooling mode decreasing system pressure. Without this important function, the tank/system pressure will drop creating a vacuum that decreases the positive suction pressure on the pumps.Geo-Flo’s 3-way flushing valves with Flo-Link double O-ring connections are built into the NP series flow center. By incorporating flushing valves into the flow center, the ground loop may be flushed without adding external flush ports, saving installation time and additional cost. For installers that wish to flush the ground loop separately from the interior piping and heat pump, we offer the NP Plus (NPP, see below). Show more