The NABIC Fig 503 Three Way Vent Cock has been designed for use on vented hot water systems, to ensure there is a permanent connection from the boiler or calorifier to atmosphere.
This valve allows the use of a single common vent pipe and permits continued operation of the system whilst maintenance is carried out on an individual unit.
Medium: Hot water
Size Range: DN20 - DN65
Pressure: 7 bar
Material: Gunmetal
Temperature: -20 to 93°C
Connection: Female
Pipe Connections
Female end connections BSP to BS EN 10226-1.: Rp 3/4", Rp 1", Rp 1 1/4", Rp 1 1/2", Rp 2", Rp 2 1/2".
Testing
All valves are 100% production tested.
Product Extras
Materials
| ITEM NO. | PART NAME | MATERIAL |
|---|---|---|
| 1 | Handwheel | Aluminium |
| 2 | Name plate | Aluminium |
| 3 | Hex Head Screw | Brass |
| 4 | Washer | Steel |
| 5 | Gland Nut | BS EN 12164:1998 CW609N |
| 6 | Gland Packing | Non ASB Graphite |
| 7 | Gland Ring | BS EN 12164:1998 CW609N |
| 8 | Spindle | BS EN 12164:1998 CW602N |
| 9 | 'O' Ring | Rubber Nitrile |
| 10 | Head | BS EN 1982:1999 CB491K |
| 11 | Body | BS EN 1982:1999 CB491K |
| 12 | 'O' Ring | Rubber Nitrile |
| 13 | Retaining Plate | Stainless Steel, BS 3146 ANC 4BFC |
| 14 | Valve Disc | BS EN 12164:1998 CW602N |
| 15 | Seat Insert | Virgin PTFE |
| 16 | 'O' Ring | Rubber Nitrile |
| 17 | Locknut | BS EN 12164:1998 CW602N |
Dimensional Drawings
Dimensions & Weights
| SIZE DN | Rp BSP | A (mm) | B (mm) | C (mm) |
|---|---|---|---|---|
| 20 | 3/4' | 70 | 110 | 38 |
| 25 | 1" | 84 | 145 | 48 |
| 32 | 1 1/4' | 98 | 150 | 63 |
| 40 | 1 1/2' | 114 | 170 | 72 |
| 50 | 2' | 140 | 190 | 78 |
| 65 | 2 1/2' | 170 | 220 | 114 |
To order these products please call us on +44 (0)1462 443 278.
Free delivery on orders over £400.
We had an existing NABIC Fig. 500 safety valve installed in our steam boiler factory which needed replacing. The valve had started to leak due to its old age.
I had no hesitation in purchasing another as it’s been a great product. I was very happy with the service of the website, as well as the prices. The fact the valves come with the necessary certifications is also great.
Wayne Barnes- Engineering Co-ordinator, Newlywed Foods