Emerson Alco 056818 Expansion Valve

The Emerson Alco 056818 Expansion Valve (Model HFES 8 HCA) is a high-capacity, balanced ported valve engineered specifically for demand-heavy refrigeration, air conditioning, and heat pump applications. This externally equalized thermal expansion valve provides 8 tons of nominal capacity and is optimized for R22 and R407C refrigerants. Its balanced port design ensures consistent superheat control by compensating for changes in head pressure, making it an essential component for maintaining HVAC system efficiency in variable ambient conditions.

Built with a stainless steel replaceable power assembly, the HFES 8 HCA 5FT is designed to resist corrosion and mechanical fatigue, significantly extending the service life of the liquid line metering device. This model features a 1/2" x 7/8" ODF sweat connection and a 5-foot capillary tube for flexible sensing bulb placement. The straight body configuration and heat pump charge (HC code) allow for reliable performance across a wide range of evaporator temperatures, ensuring precise refrigerant flow control and preventing liquid slugging in the compressor.

Key Benefits for Contractors:

• Broad Refrigerant Compatibility: Fully compatible with R22 and R407C, providing a versatile solution for 8-ton commercial and residential units.
• Superior Durability: The stainless steel power assembly eliminates the common failure point of corrosion found in standard brass elements.
• Stable Superheat Regulation: The balanced port design maintains precise superheat even as head pressures fluctuate during seasonal transitions.
• Simplified Installation: Features ODF sweat connections (1/2" inlet, 7/8" outlet) and a 5-foot capillary for easy integration into existing line sets.
• Maximum Working Pressure: Rated for up to 450 psig, meeting the rigorous standards of modern heat pump applications.

Common Questions & Technical Support:

Can this TXV be used in bi-flow applications?
While the Emerson HF series offers bi-flow capability up to 5-1/2 tons for R22, this 8-ton HFES 8 HCA model is an extended body valve. Always verify the specific system piping and internal check valve requirements before using it in a bi-directional heat pump circuit.

Is the superheat on the 056818 adjustable?
Yes, the HFES series typically features a manual superheat adjustment nut, allowing technicians to fine-tune evaporator performance based on specific field conditions and load requirements.

Why choose an externally equalized valve?
An externally equalized TXV is necessary for systems with high pressure drops across the evaporator or where a distributor is used. It ensures the valve accurately senses the pressure at the evaporator outlet, providing more precise refrigerant metering than internally equalized models.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.