Electric expansion valve
3/8" - 1 5/8", 650 psig | EX4/EX8 Emerson Flow Controls

The EX4-EX8 are stepper motor driven valves that are optimized for the
control of liquid or gaseous mass fl ow in refrigeration systems. Multifunction
capability as expansion valve, hot gas bypass, suction gas throttling,head
pressure, liquid line actuator and other applications systems.
Features
• Fully hermetic design
• Fast full stroke time
• Applicable to all common refrigerants (HCFC, HFC), for
subcritical CO2 applications
• High resolution and excellent repeatability
• Bi-fl ow versions for heat pump applications
• Positive shut-off function to eliminate the use of an
additional solenoid valve
• Linear fl ow capacity
• Wide capacity range (10 - 100%)
• Continuous modulation of mass fl ow, no stress
(liquid hammering) in the refrigeration circuit
• Direct coupling of motor and valve for high reliability
(no gear mechanism)
• Ceramic slide and port for accurate fl ow and minimal wear
• Balanced force design
• Corrosion resistant stainless steel body, and connections