How do you resurface a hot water valve seat in an older 3 tub shower assembly?

Resurfacing a hot water valve seat in an older 3-tub shower assembly requires careful preparation and precision work to ensure proper sealing and functionality. Here are the steps to help you resurface the valve seat:

Tools and Materials:

- Adjustable wrench

- Screwdriver

- Needle-nose pliers

- Wire brush

- Sandpaper (100-grit and 220-grit)

- Valve seat grinder

- Grinding compound

- Lubricant

- Safety goggles

- Towel

- Plumber's putty

Step 1: Preparation:

1. Turn off the water supply to the shower.

2. Remove the shower handle by unscrewing the retaining screw with a screwdriver.

3. Use an adjustable wrench to loosen and remove the shower cartridge.

4. Gently pull out the valve stem from the valve body.

Step 2: Cleaning:

5. Clean the valve seat area using a wire brush to remove any dirt, corrosion, or mineral buildup.

6. Wipe off the valve seat and surrounding areas with a clean towel.

Step 3: Sanding:

7. Use 100-grit sandpaper to remove any remaining debris or roughness from the valve seat.

8. Once the surface is smooth, use 220-grit sandpaper to create a finely sanded surface.

Step 4: Applying Grinding Compound:

9. Apply a small amount of grinding compound to the valve seat using a cotton swab or a small brush.

Step 5: Resurfacing:

10. Attach a valve seat grinder to a power tool (such as a drill).

11. Insert the grinder into the valve seat and turn on the power tool at a low speed.

12. Move the grinder in a circular motion while applying light pressure.

13. Continue grinding until the valve seat is smooth and free from any imperfections.

Step 6: Cleaning and Lubrication:

14. Use a clean damp cloth to wipe off any remaining grinding compound from the valve seat and the surrounding area.

15. Apply a small amount of lubricant to the valve stem and the valve seat to ensure smooth operation.

Step 7: Reassembly:

16. Reinsert the valve stem into the valve body.

17. Replace the shower cartridge and secure it with the retaining screw.

18. Reinstall the shower handle.

Step 8: Final Check:

19. Turn on the water supply and check for any leaks. If there are no leaks, the valve seat has been successfully resurfaced.

Tips and Precautions:

- Always wear safety goggles when working on plumbing fixtures.

- Be careful not to over-grind the valve seat, as this could damage the valve body.

- If you encounter significant damage or wear to the valve seat, it may be better to replace the entire valve assembly.

By following these steps, you can effectively resurface the hot water valve seat in your older 3-tub shower assembly, ensuring proper sealing and longevity of your shower fixture.