Emerson Flow Control (Alco) 066180 Normally Closed Solenoid Valve Body 3/8" Sweat 3.4 Ton R410A

The Emerson Flow Control (Alco) 066180 is a 2-way, normally closed (N/C) refrigeration solenoid valve body designed for use with R410A refrigerant in residential and commercial HVAC and refrigeration systems. With a rated capacity of 3.4 tons and a 3/8" sweat (solder) connection, this valve body provides precise, reliable control of refrigerant flow in liquid line and suction line applications.

As a pilot-operated solenoid valve, the 066180 opens when the solenoid coil is energized and closes automatically when power is removed — ensuring a fail-safe, normally closed configuration that protects the system during power loss. The valve body is sold without the solenoid coil, allowing technicians to pair it with the appropriate Emerson AMG or ASC2 series coil for their required voltage (24V, 120V, or 240V).

Key Features:

• Normally closed (N/C) operation — closes automatically when de-energized
• Rated for 3.4 tons capacity with R410A refrigerant
• 3/8" sweat (ODF) connection for copper line brazing
• Pilot-operated design for reliable performance across a range of pressure differentials
• Valve body only — solenoid coil sold separately
• Low external leakage for system integrity and efficiency
• Compatible with Emerson AMG and ASC2 series interchangeable coils
• Suitable for liquid line and suction line service

The Emerson Alco 066180 is an ideal replacement solenoid valve body for R410A split systems, heat pumps, and refrigeration equipment requiring dependable, electromagnetically controlled refrigerant shutoff. Always install the valve with the coil housing oriented vertically and upright for optimal performance.