5 Year Warranty
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Fig 542 Safety Relief Valve

5 Year Warranty
Buy Online Price from £128.61 (ex vat)

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).

  • WRAS approval to be used on all potable water applications
  • High degree of seat tightness
  • Diaphragm protected parts
Pressure Equipment Directive - PED 2014/68/EU
Product Features +

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

  • Available with Viton seat design
  • Padlock available
  • Pressure setting locked and sealed
  • Drain plug fitted on sizes DN40 and above allows fitting of a pressure gauge

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

Fig 542 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

 

Downloads +
Discharge Capabilities +
Buy Online +

Fig 542 Safety Relief Valve

  • Online ordering is only available in the UK and Northern Ireland
  • Orders placed before 2pm Monday to Thursday will be delivered next working day
  • Orders placed before 10am on Fridays will be delivered on Monday
  • Customers can order up to 5 of any one product line. For larger orders please call us on 01462 443 278
  • Order over £400 for Free Next Day Delivery

View Delivery, Returns & Refunds Details

 

Part Number Size Ex Vat Stock Status More
DN15 £ 128.61 In stock +
1/2" BSPP Female Inlet and Outlet to BS21 - PTFE to Metal Seat
DN20 £ 147.61 In stock +
3/4" BSPP Female Inlet and Outlet to BS21 - PTFE to Metal Seat
DN25 £ 195.13 In stock +
1" BSPP Female Inlet and Outlet to BS21 - PTFE to Metal Seat
DN32 £ 271.52 In stock +
1.1/4" BSPP Female Inlet and Outlet to BS21 - PTFE to Metal Seat
DN40 £ 363.72 In stock +
1.1/2" BSPP Female Inlet and Outlet to BS21 - PTFE to Metal Seat
DN50 £ 458.97 In stock +
2" BSPP Female Inlet and Outlet to BS21 - PTFE to Metal Seat
DN65 £ 644.55 In stock +
2.1/2" BSPP Female Inlet and Outlet to BS21 - PTFE to Metal Seat
DN80 £ 922.76 In stock +
3" BSPP Female Inlet and Outlet to BS21 - PTFE to Metal Seat

Set Required Pressure

Please type your required set pressure from 0.3 to 10.5. Pressure settings can be in 0.1 increments.
Please check set pressure charts on Discharge Capabilities section.

Test certificates are included free of charge for this product

Price £128.61

You must select a value for all options provided.

Quantity

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

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