LPA® Liquid Pressure Amplification

    Reliable Liquid Stability for Modern Refrigeration & Heat‑Pump Systems

    For over 40 years, HY‑SAVE® has advanced the science of liquid refrigerant pumping.
    Our LPA® Liquid Pressure Amplification technology provides a small, controlled pressure boost to the liquid line — ensuring stable, high‑quality liquid refrigerant reaches the expansion device under all operating conditions.

    This simple, proven approach enhances system reliability, improves seasonal efficiency, and supports the transition to low‑GWP refrigerants.

    why LPA matters

    Modern low‑GWP refrigerants operate at lower pressures and narrower liquid margins. The LPA® pump provides a small, controlled pressure boost that ensures:- Stable liquid supply – Improved expansion‑valve performance – Enhanced part‑load efficiency – Support for long or complex liquid lines – Reliable operation across wide ambient conditionThey provide for a range of applications that makes refrigeration systems more efficient, including:

    Why liquid stability matters

    Modern refrigerants operate at lower pressures and narrower liquid margins. Even modest pressure drops can cause premature flashing, reducing system performance and destabilizing expansion‑valve control.The LPA pump prevents this by increasing liquid pressure just enough to keep the refrigerant fully liquid — even in:- Long or complex liquid lines – Vertical lifts – Low‑ambient conditions – High‑efficiency, low‑head‑pressure operation – Systems using low‑GWP refrigerants Stable liquid means stable performance

    How LPA® Works

    The LPA pump is installed in the liquid line after the condenser or receiver. It provides a small pressure increase that:- Raises the refrigerant’s saturation temperature – Prevents flashing in the liquid line – Ensures consistent liquid quality to the TXV/EEV – Improves evaporator performance – Supports lower condensing pressures for higher efficiency See integration examples: OEM LPA schematics

    Product Range

    HY‑SAVE® manufactures a complete family of LPA® pumps engineered for a wide range of refrigerants and system architectures:-

    Low‑lift LPA pumps — ideal for short liquid lines and moderate ΔP –

    High‑lift LPA pumps — designed for long runs and vertical lift – CO₂ liquid pumps — engineered for subcritical and transcritical applications –

    NH₃ liquid pumps — hermetic, oil‑free, and corrosion‑resistant –

    Dual‑stage pumps — for high ΔP or multi‑evaporator systems Each model is compact, hermetic, refrigerant‑cooled, and built for long service life.