Pegler K4424 22mm DZR Double Check Valve — 42069
The Pegler K4424 (42069) is a commercial-grade 22mm compression double check valve engineered from premium Dezincification Resistant (DZR) brass. Designed to provide Category 3 backflow protection in compliance with UK Water Supply (Water Fittings) Regulations 1999, it features twin independent spring-loaded cartridges housed in a compact inline body to prevent mains water contamination from back-siphonage and back-pressure.
Identification & Technical Guide:
Brand: Pegler | MPN: 42069 | Model: K4424 | Internal Reference: FTB13099 | Pipe Connection: 22mm compression ends (3/4" BSP equivalent thread connection) | Working Ratings: 10.0 bar up to 65°C (surge up to 90°C for 1 hour max) | Minimum Operating Pressure: 0.0 bar (no minimum head required)
Key Features
- Dezincification Resistant (DZR) Brass: Resists aggressive chemical attack, dezincification corrosion, and stress corrosion cracking in high-risk water supplies.
- Twin Independent Check Units: Dual spring-assisted non-return cartridges ensure fail-safe Category 3 fluid risk containment against back-siphonage and back-pressure.
- Zero Minimum Head Pressure: Operates efficiently across gravity, pumped, and high-pressure unvented mains networks without requiring a threshold opening pressure.
- Robust Thermal Tolerance: Rated for continuous working service up to 10.0 bar at 65°C, with an emergency thermal excursion rating of 90°C for 1 hour.
Installation & Compatibility Notes
Flow Direction Alignment: This valve is directional. Ensure the directional flow arrow cast onto the DZR brass body points directly downstream towards the draw-off point or protected appliance.
Compression Fitting Advice: Suitable for 22mm OD copper pipe conforming to BS EN 1057. Cut copper cleanly, deburr the pipe end, and hand-tighten compression nuts onto the copper olive before tightening 1 to 1.25 turns with a suitable spanner. Use a backing spanner across the valve body hex flats to avoid body distortion.
Associated Products & Replacement Seals
- Replacement Olives: Standard 22mm brass or copper compression olives (BS EN 1254-2)
- Alternative Sizing: Pegler K4424 15mm DZR Double Check Valve (1/2" equivalent)
- Category Risk Standard: Fluid Category 3 backflow prevention (e.g., domestic supply feeds to commercial appliances, wash basins, and outside taps)