The ERI PX-Q400 (also written PXQ400) is a 400 GPM (91 m³/h) isobaric pressure exchanger designed for seawater reverse osmosis systems in the 50,000–120,000 GPD range. Q-series quiet delivers 98%+ pressure transfer efficiency, cutting SWRO energy by 55-60%. The PX-Q400 contains a single ceramic rotor that spins hydraulically (no motor) at 1,200-1,800 RPM. As the rotor spins, axial channels alternately fill with low-pressure feed water and high-pressure brine. The pressure transfers directly fluid-to-fluid, recovering the high-pressure brine energy and pressurizing incoming feed at 98% efficiency. This eliminates the need for the high-pressure pump to handle the full feed flow — only the permeate fraction (~40%). Customers searching for this device commonly use these keywords: PX-Q400, PXQ400, ERI PX-Q400, ERI PXQ400, px-q400 pressure exchanger, pxq400 energy recovery device, px-q400 SWRO. ForeverPure stocks the PX-Q400 and related Q-series for same-week dispatch. Send us your SWRO system specs (target permeate flow, feed water TDS, operating hours) and we'll confirm PX-Q400 fit and provide a formal quote within one business day. Request PX-Q400 Quote → · All ERI PX Models · SWRO Buyer's GuideERI PX-Q400 (PXQ400) Pressure Exchanger: 400 GPM Isobaric Energy Recovery for SWRO
PX-Q400 Quick Specifications
Manufacturer Energy Recovery Inc (ERI) Model PX-Q400 (also written PXQ400) Flow Rate 91 m³/h (400 GPM) Max Pressure 83 bar (1,200 psi) Efficiency 98%+ SWRO System Range 50,000–120,000 GPD product water Materials 2507 super-duplex stainless steel housing, alumina ceramic rotor Acoustic emission ~71 dB(A) — quiet series Stock 4 weeks lead How the PX-Q400 (PXQ400) Works
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