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Fig 503 3 Way Vent Valve

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 £ 250.47 Call us +
1" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction
DN32 £ 349.01 Call us +
1.1/4" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction
DN40 £ 438.91 Call us +
1.1/2" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction
DN50 £ 603.23 Call us +
2" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction
DN65 £ 824.85 Call us +
2.1/2" BSPP Boiler, Vent and Drain Connections to BS21. Cassette Construction
DN65 £ 1,446.10 Call us +
2.1/2" BSPP Drain Connection - Boiler & Vent Connections Flanged (BS4504 PN16)

What our customers say

The reason I went to NABIC was because we have to meet certain water regulations. After a chat with Northumbrian Water, they suggested looking into NABIC products as they are WRAS approved and suitable to use on all potable water applications.

I went direct and bought 4 pipe interrupters with next day delivery, which have been installed in our on-site laboratory. My user experience was great and I liked the fact that site has all the necessary specifications and prices easily to hand.

Peter Bauckham - Managing Director, Argos Inspection

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