Emerson Alco 058808 Expansion Valve

For high-tonnage commercial refrigeration and medium-temperature applications, the Emerson Alco 058808 Expansion Valve (now updated to model 066538) provides the precise superheat control required for stable system operation. This 10-ton thermostatic expansion valve features a balanced port design, which compensates for varying head pressures and provides stable evaporator control across a wide range of operating conditions. Built with a 5/8" x 7/8" ODF sweat connection and a straight body configuration, it is engineered for seamless integration into existing liquid lines.

The HFES 10 SC utilizes a medium temperature charge specifically calibrated for R404A, R507, and R502 refrigerants. A 5' capillary tube allows for flexible sensing bulb placement on the suction line, while the externally equalized design ensures accurate pressure sensing even in systems with high pressure drops across the evaporator. The rugged stainless steel replaceable power assembly protects against corrosion, preventing the common failure points associated with harsh mechanical environments. For contractors managing refrigeration rack systems or large walk-in coolers, this valve ensures maximum energy efficiency and protects the compressor from liquid slugging.

• Balanced Port Design: Maintains consistent superheat control despite fluctuations in head pressure or liquid temperature.
• Corrosion Resistance: Features a stainless steel power assembly to extend the service life of the valve in demanding environments.
• Multi-Refrigerant Compatibility: Fully compatible with R404A, R507, and R502, making it a versatile choice for service and retrofits.
• External Equalization: Provides superior accuracy by sensing pressure at the evaporator outlet, compensating for refrigerant pressure drop.
• Updated Performance: The 066538 serves as a direct, high-performance replacement for the legacy 058808 model.

Is the 066538 a direct drop-in for the 058808?
Yes, the 066538 is the official updated version from Emerson Alco. It maintains the same 10-ton capacity and 5/8" x 7/8" sweat dimensions for a direct swap.

What is the maximum working pressure for this HFES series valve?
The HFES 10 SC is rated for a maximum working pressure of 450 psig, suitable for most commercial R404A medium temperature systems.

Does this valve include a removable inlet strainer?
The HFES series typically features a non-removable strainer; however, always verify the specific model nomenclature (HFESC vs HFES) if a removable screen is required for your application.

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.