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The NABIC Fig 542 is an extremely versatile valve and although designed primarily for the protection of hot water boilers, its wide range of applications make it an ideal general purpose safety valve.
All wetted parts are manufactured from dezincification resistance materials. Designed and tested to BS EN ISO 4126 -1. Approved for use on applications requiring WRAS (1 bar and above).
Medium: Hot water, steam, compressed air and inert gasses, Co2 (to 20°C), ethylene glycol, potable water
Size Range: DN15 - DN80
Pressure: 0.3 - 10.5 bar
Material: Gunmetal
Temperature: -20 to 195°C
Connection: Screwed inlet & outlet
Pipe Connections
Threaded female inlet and outlet connections. inlet and outlet connections are of equal size. Threaded connections are Rp (BSP) parallel to BS EN 10226-1 NPT connections are available upon request.
Testing
All valves are shell and seat tested (to confirm set pressure) before leaving the factory and all valves are supplied pre-set with a tamper proof seal. Pressure Test Certificate and Letters of Conformity available on request.
Product Extras
Materials
| Ref No | Name of Part | Material |
|---|---|---|
| 1 | Thrust Washer | Brass, BS EN 12164 CW609N |
| 2 | Grubscrew | Steel |
| 3 | Test Lever | Brass, BS EN 1982 CC754S |
| 4 | Spring | Chrome Vandium Alloy Steel, BS 2803 735 A50 HS (Stainless Steel, BS 2056 302S26 Opt) |
| 5 | Label | Yellow kapton |
| 6 | Spring Cover | Bronze, BS EN 1982 CC491K |
| 7 | Piston | Brass, BS EN 12164 CW609N |
| 8 | Diaphragm | Silicon Rubber |
| 9 | Seat Seal Holder | Bronze, BS EN 1982 CC491K / Brass BS EN 12164 CW602N (DZR) |
| 10 | Seat Seal | PTFE (Viton Opt) |
| 11 | Starlock Washer | Stainless Steel |
| 12 | Body | Bronze, BS EN 1982 CC491K |
| 13 | Lever Pin | Steel |
| 14 | Lead Seal (Not shown) | Lead |
| 15 | Adjusting Screw | Brass, BS EN 12164 CW609N |
| 16 | Spring Plate | Brass, BS EN 12164 CW609N |
| 17 | Spindle | Brass, BS EN 12164 CW721R |
| 18 | Seat Seal Retaining Plate | Bronze, BS EN 1982 CC491K / Brass BS EN 12164 CW602N (DZR) |
| 19 | O-Ring | Viton |
Dimensional Drawing
Dimensions & Weights
| SIZE DN | Rp BSP Inlet & Outlet |
A (mm) |
B (mm) |
C (mm) |
Weight (Kg) |
|---|---|---|---|---|---|
| 15 | 1/2" | 30 | 23 | 113 | 0.35 |
| 20 | 3/4" | 34 | 23 | 118 | 0.53 |
| 25 | 1" | 39 | 27 | 132 | 0.80 |
| 32 | 1 1/4" | 46 | 33 | 153 | 1.33 |
| 40 | 1 1/2" | 54 | 38 | 198 | 2.30 |
| 50 | 2" | 64 | 46 | 236 | 4.20 |
| 65 | 2 1/2" | 76 | 55 | 275 | 7.80 |
| 80 | 3" | 90 | 65 | 335 | 12.50 |