Internally Equalized vs Externally Equalized TXV

An internally equalized TXV senses its outlet pressure, using it as a closing force on the underside of the powerhead’s diaphragm to offset the opening force of the pressure from the temperature sensing bulb on the top side of the powerhead. These valves are typically used on evaporators with a relatively low pressure drop…ie, the outlet pressure is nearly the same as the inlet pressure. Continue reading