Rack Refrigeration Cycle Part 9 – Mechanical Expansion Valves

Key topics covered:

• The three fundamental liquid conditions needed for expansion valve operation
• Thermal expansion valve operation and components
• P1, P2, P3, and P4 pressure relationships
• Internal vs external equalization – when to use each
• Proper valve sizing and correction factors
• Balanced vs non-balanced valve selection
• Q-body valve selection for supermarket applications
• Bulb placement considerations and best practices