5 Year Warranty
FIG503_SafetyValve_DN40_Nabic_RedBG_v2.jpg
FIG503_SafetyValve_DN40_Nabic_RedBG_v1.jpg FIG503_SafetyValve_DN40_Nabic_RedBG_v2.jpg FIG503_SafetyValve_DN40_Nabic_RedBG_v3.jpg FIG503_SafetyValve_DN40_Nabic_RedBG_v4.jpg

Fig 503 3 Way Vent Valve

5 Year Warranty
Buy Online Price from £203.74 (ex vat)

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.

  • Boiler connection permanently open
  • Minimum water loss on changeover
  • Cassette construction for ease of Inspection and in-line servicing
Product Features +

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

  • DN65 available with flanged boiler and vent connections

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

Fig 503

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

 

Downloads +
Buy Online +

Fig 503 3 Way Vent Valve

To order these products please call us on +44 (0)1462 443 278. 

Free delivery on orders over £400.

Part Number Size Ex Vat Stock Status More
DN20 £ 203.74 Call us +
3/4" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction
DN25 £ 257.98 Call us +
1" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction
DN32 £ 359.49 Call us +
1.1/4" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction
DN40 £ 452.09 Call us +
1.1/2" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction
DN50 £ 621.33 Call us +
2" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction

What our customers say

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

Sign up to get the latest product news and offers direct from NABIC