Fixed Orifice, pistons and Capillary tubes
Fixed orifice is a fixed hole that cannot change in size.
This is often referred to as a piston with an orifice size and in other cases its a capillary tube where the length and size of the tube restricts the flow of refrigerant.
Copy of Target Superheat new1.xlsx - Sheet1(1).pdf
Piston vs. TXV Metering Devices - HVAC SchoolThe piston (fixed orifice) and TXV (thermostatic expansion valve) are the two most common metering devices in use today, though some modern systems utilize an electronically-controlled metering device called an EEV (electronic expansion valve). It should be noted that there are other types of fixed-orifice metering devices, like capillary tubes; however, their use is not […]