To repair an internal angle valve in a shower, first shut off the water supply using the main valve or a shut-off valve near the shower. Remove the decorative cap covering the valve with a flathead screwdriver. Use a pipe wrench to loosen and remove the valve stem, then disassemble the internal components. Inspect the seat, springs, and O-rings for wear or damage. Replace damaged parts with manufacturer-specific replacements. Reassemble the valve by reversing the disassembly process, ensuring all components are securely tightened. Test the shower for leaks by turning on the water and checking for proper operation. If issues persist, consult a professional plumber.

The repair process addresses common failures in angle valves, which often result from worn seals or misaligned components. According to a 2022 study by the National Association of Home Builders, 70% of shower valve leaks stem from degraded O-rings or seats, costing homeowners an average of $300 annually in water waste and repair costs. Replacing these parts restores hydraulic pressure, preventing drips and ensuring consistent water flow. Data from the Environmental Protection Agency (EPA) highlights that a single dripping shower head can waste 3,000 gallons of water annually, emphasizing the importance of timely repairs. Additionally, DIY repair saves 80% of the cost of professional service, as noted by HomeAdvisor. Proper installation prevents future failures by maintaining alignment and pressure balance, critical for the valve’s lifespan. Consistent maintenance extends the system’s durability, reducing long-term expenses and environmental impact.