Step1: Shut off equipment and ensure unit is fully cooled and depressurized.
Step2: Remove existing stem assembly and clean valve seat area thoroughly.
Step3: Inspect o-ring condition and lightly lubricate if required.
Step4: Insert new stem straight into the valve body, ensuring proper alignment.
Step5: Tighten assembly evenly without excessive force to protect the seal.
Step6: Reattach handle and check smooth opening and closing action.
Step7: Run a low-pressure test and check for leaks around the stem.