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Rack Refrigeration Cycle Part 9 – Mechanical Expansion Valves

In Part 9 of our Rack Refrigeration Cycle series, Matthew Taylor dives deep into mechanical expansion valves - one of the most critical components in refrigeration systems. Learn about the three essential conditions required for proper metering device operation, the differences between internally and externally equalized TEVs/TXVs, and how proper valve sizing impacts system performance.
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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

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