1. Product Overview
Brass gate valves are quarter-turn shutoff valves designed for complete flow isolation in plumbing and industrial systems. Featuring a solid wedge design with rising stem mechanism, these valves provide bubble-tight shutoff and full bore flow when fully open.
2. Material Specifications
- Body/Bonnet: CW602N DZR brass (dezincification-resistant)
- Stem: CW614N brass, chrome-plated
- Disc/Wedge: Solid brass with PTFE coating
- Seat: Reinforced PTFE or bronze
- Packing: Graphite-impregnated braided rope
3. Technical Parameters
Pressure Ratings
- Working pressure: 16 bar (PN16) @ 20°C
- Cold working pressure: 20 bar @ -20°C
- Burst pressure: ≥40 bar
Temperature Range
- Standard: -20°C to 120°C
- High-temp version: -20°C to 180°C (special order)
Flow Characteristics
- Full port design (100% bore)
- Flow coefficient (Cv): 22 (DN50 size)
- Pressure drop: <0.15 bar @ full open
4. Connection Types
- Threaded Ends:
- BSPP (parallel)
- BSPT (tapered)
- NPT (American standard)
- Flanged Ends:
- PN16 flange standard
- DN15-DN100 sizes
- Union Ends:
- Nut and sleeve connection
- Easy maintenance design
5. Installation Guidelines
Pre-Installation
- Verify flow direction matches valve arrow
- Flush pipeline to remove debris
- Check gasket/thread condition
Installation Steps
- For threaded valves:
- Apply PTFE tape (15 wraps minimum)
- Hand-tighten plus 1.25 turns with wrench
- Max torque: 35Nm (DN50)
- For flanged valves:
- Align flanges within 0.5mm
- Tighten bolts in crisscross pattern
- Final torque: 50Nm (M12 bolts)
Post-Installation
- Cycle valve 5 times before pressurization
- Pressure test at 24 bar (PN16)
- Check for leaks at:
- Stem packing
- Body connections
- Seat area
6. Maintenance Schedule
Routine Maintenance
- Monthly:
- Exercise valve (full open/close)
- Inspect for external leaks
- Quarterly:
- Check packing tightness
- Lubricate stem threads
- Annual:
- Replace packing if needed
- Inspect seat condition
Major Service (5 Years)
- Complete disassembly
- Replace all wear components:
- Stem packing
- Seat rings
- Gaskets
- Reassemble with food-grade lubricant
7. Troubleshooting Guide
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Leakage when closed | Seat damage | Lap or replace seats |
| Stem leakage | Packing wear | Adjust or replace packing |
| Hard operation | Stem corrosion | Clean and lubricate |
| Handle slippage | Stripped gears | Replace gear mechanism |
8. Industry Compliance
- Standards:
- BS 5154 (copper alloy gate valves)
- API 600 (design)
- EN 13709 (materials)
- Certifications:
- WRAS (UK water)
- NSF/ANSI 61 (potable water)
- DVGW (Germany)
9. Application Notes
- Recommended for:
- Water distribution systems
- HVAC installations
- Industrial process lines
- Not suitable for:
- Throttling applications
- Slurry services
- Steam systems
Conclusion
Brass gate valves provide reliable shutoff capability for fluid control systems, combining durable DZR brass construction with precision-engineered components. Their full-bore design ensures minimal pressure loss, while the rising stem mechanism offers clear visual indication of valve position. Proper installation following torque specifications and adherence to the recommended maintenance schedule will ensure optimal performance and extended service life in commercial and industrial applications. The valves’ compliance with international standards guarantees quality and safety across various operating conditions.
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