1. Definition & Function
A brass angle valve (also known as an angle stop valve or angle shut-off valve) is a manual quarter-turn valve designed to regulate or isolate water flow in plumbing systems. Its primary function is to provide localized shut-off capability for fixtures such as sinks, toilets, and appliances while accommodating directional pipe routing.
2. Design & Construction
2.1 Material Composition
- Body & Components: High-grade brass (CZ121/CW617N or lead-free DZR brass for potable water compliance).
- Seat & Washer: Typically EPDM (ethylene propylene diene monomer) or PTFE (Teflon) for a leak-proof seal.
- Handle: Plastic (PP), chrome-plated brass, or stainless steel for corrosion resistance.
2.2 Angled Configuration
- 90-degree bend optimizes space in tight corners (e.g., wall-to-fixture connections).
- Inlet/Outlet Orientation:
- Inlet: Straight thread (connects to supply line).
- Outlet: 3/8″ or 1/2″ compression/threaded (for flexible hoses or rigid pipes).
3. Key Features
- Pressure Rating: 16–25 bar (varies by standard: ANSI, EN, or DIN).
- Temperature Range: -20°C to 120°C (suitable for hot/cold water).
- Operation: Quarter-turn (ball valve mechanism) or multi-turn (gate/globe-style).
4. Applications
- Residential: Sink/toilet supply isolation, dishwasher/washing machine connections.
- Commercial: HVAC systems, boiler feed lines, industrial plumbing.
- Compatibility: Works with copper, PEX, CPVC, and stainless steel tubing.
5. Standards & Certifications
- Potable Water: NSF/ANSI 61, WRAS, ACS (lead-free compliance).
- Industry Standards: ISO 9001, EN 1254, ASME B16.34.
6. Advantages Over Alternatives
| Feature | Brass Angle Valve | Plastic Angle Valve |
|---|---|---|
| Durability | High (corrosion-resistant) | Prone to cracking |
| Pressure Tolerance | 25+ bar | ≤10 bar |
| Lifespan | 10–15+ years | 3–5 years |
| Temperature Range | Wider | Limited |
7. Maintenance & Troubleshooting
- Leak Causes: Worn washer, seat damage, or improper installation.
- Solution: Replace washer or reseat valve using thread sealant (Teflon tape/pipe dope).
For specialized applications (e.g., gas, high-pressure steam), verify valve specifications with the manufacturer.
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