NOTE: Mounting the TXV in the upright position is preferred. Mounting TXV upside down may increase the chance that debris could deposit on the internal check valve and hold the check valve open during cooling and act as a bleed port.Click to see full answer. Just so, can you mount a Txv bulb vertical?Always insulate the entire sensing bulb after installation. A sensing bulb can be installed on a vertical suction line if necessary, but never place the bulb downstream of a trap.Beside above, should Txv bulb be insulated? It is important to properly wrap the bulb and suction line where the TXV sensing bulb is attached. A good insulator is recommended. One typically provided by the manufacturer. If any of these steps are not followed, the TXV will not function properly. Accordingly, how do you install a Txv bulb? TXV Bulb Placement Mount the bulb on the suction line. Mount TIGHTLY it with a proper metallic strap (usually copper, brass or stainless). Position it on a flat, clean, smooth, portion of the horizontal suction line. Mount it before the equalizer tube (closer to the evaporator than the EQ tube) How do you adjust a Txv valve?The TXV cannot be adjusted open or closed, it is a modulating valve. Turning the adjustment stem clockwise will only increase spring pressure causing a higher superheat. Turning the adjustment stem counterclockwise will decrease spring pressure reducing superheat.