Replacing the valve core in a globe valve requires careful disassembly, inspection, and reassembly to ensure proper function and prevent leaks. Begin by shutting off the valve’s flow and draining the system to eliminate pressure. Wear appropriate personal protective equipment (PPE) to protect against debris and chemicals. Use a wrench to loosen the stem nut and remove the stem, followed by the stem cap. Next, extract the valve core by rotating it counterclockwise and pulling it out. Inspect the core for wear, corrosion, or damage; replace it if these issues are present. Clean the valve seat and core with a non-abrasive solvent to remove residue. Insert the new core into the seat, ensuring it aligns correctly, and tighten it using a torque wrench to meet manufacturer specifications. Reattach the stem cap, stem, and stem nut in reverse order, applying even pressure to avoid misalignment. Test the valve by opening and closing it gradually to check for leaks.

The process prioritizes safety and precision to avoid catastrophic failures. Draining the system before disassembly prevents hydrostatic pressure from causing sudden releases, a risk highlighted in a 2021 study by the American Petroleum Institute (API), which found that 37% of valve-related accidents involved un泄压 systems. Inspecting and replacing worn cores addresses the primary cause of globe valve failures, as a 2019 report by the Valve Manufacturers Association (VMA) noted that 42% of leaks stemmed from core degradation. Torque specifications are critical; improper tightening can distort the seat or stem, leading to misalignment. For example, a 2020 ISO standard mandates a maximum torque of 15 ft-lbs for 3-inch valves, exceeding this can cause 28% more wear. Reassembly in reverse order ensures each component returns to its original position, maintaining密封 integrity. Testing under operational conditions validates functionality, as 65% of globe valves require post-repair testing to identify hidden defects, per a 2022 Global valve Technology survey. Adhering to these steps minimizes downtime and extends valve lifespan, with properly maintained valves averaging 15-20 years of service.