Various methods of head pressure control can have a rather dramatic effect on the performance of refrigeration systems and their components. Are you familiar with them?
To review briefly, the first part of this article dealt with a system with a capacity of 12,000 Btuh, R-22, 20°F evaporating temperature, 110° condensing temperature, 50-psi system pressure drop (including distributor pressure drop), and 100° liquid temperature, with a net pressure drop across the TX valve of 133 psi, and the selection of a 1-ton externally equalized valve the perfect choice.