When the nut on the bonnet is fully tightened and the leakage still persists, it's time to replace the plunger valve. However, this "replacement" doesn't always mean completely removing the leaking valve body from the pipeline. In many cases, it simply involves replacing the old seal ring with a new one. This task can be done using basic tools like wrenches and screwdrivers. Here’s a step-by-step guide:
1. First, shut off the upstream fluid supply to ensure no flow is going through the plunger valve you're working on. Then, open the valve fully.
2. Remove the nut by turning the handwheel in the closing direction, which will allow the bonnet to come out.
3. Once the bonnet bolts are loosened, carefully rotate the bonnet slightly around the stem so that the flange’s bottom surface faces the stud head.
4. Turn the handwheel in the opposite direction to lower the bonnet onto the stud. Keep turning until the plunger pulls off the upper seal ring.
5. Use a screwdriver to lift out the upper seal ring, along with the metal bracket and the lower seal ring.
6. Install the new seal ring in the correct order: start with the lower seal ring, then place the metal bracket, followed by the upper seal ring.
7. Before reassembling, clean the inside of the sealing ring and the outside of the plunger. Then, put everything back together—valve cover, stem, and nut. Tighten the nut so that the top of the valve cover presses against the upper seal ring.
8. Finally, turn the handwheel in the closing direction to push the plunger into the sealing ring.
At this point, the seal has been successfully replaced, and the plunger valve should function as good as new. This process is quick, cost-effective, and can save you from having to replace the entire valve. Always make sure to follow safety procedures and double-check all connections after the repair.
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