A-284238M1-AI Expansion Valve (Block Type)One New Aftermarket Replacement Expansion Valve (Block Type) for Hesston and Deutz Tractors This block type thermostatic expansion valve (TXV) regulates refrigerant flow through the cab air conditioning evaporator core, maintaining proper system pressure and cooling performance. It is a direct fit replacement for the A C systems found on Hesston and Deutz tractors and windrowers equipped with factory air conditioning. Specifications Valve Type: Block