Cast Steel Relief Check for Liquids (external spring)

PRESSURE / TEMPERATURE RATING:(Detailed on Valve ID plate)

Minimum set pressure 5psi (0.35 Bar)

Maximum set pressure 116psi (8.0 Bar)

Maximum Temperature 40°C

FLANGED:

BS EN 1092-1 – PN10, PN16, PN25, PN40

BS 10 TABLES – E, F, H

ANSI B 16.5 – Class 150

FOR WATER INDUSTRY USE ONLY WITHIN THE EUROPEAN UNION 

 

 

CONSTRUCTION:

  • This traditional design is suitable for systems with open discharge to atmosphere.
  • The external spring is not in contact with the discharge liquid.
  • The valve is intended to relieve excess liquid, and must not be used as a safety valve to prevent system failure as referenced in the Pressure Systems Safety Regulations SI 2000 No 128
  • Flanges will be drilled unless otherwise specified on order

MATERIALS:

  • Body –  Carbon Steel to BS EN 10213 gr. GP240GH (WCB) 0.23%C max
  • Cover – Carbon Steel BS EN 10028 161 – 430
  • Disc – Stainless Steel Casting ASME SA 487 CA6NM class A
  • Seat – Stainless Steel Casting to BS EN 10283 1.4408
  • Spring – Spring Alloy Steel Design in accordance with BS 1726 Chrome Vanadium Alloy Coated
 
Nominal Size Fig. 296 50 65 80 100
A PN10 254 280 305 356
A BST E, F 254 280 305 356
B 343 400 443 564
Nominal Size Fig. 295 50 65 80 100
C PN10 127 140 152 178
C BST E, F 127 140 152 178
D 324 360 413 516

 

 

STANDARD SPRING RANGE:

Nominal sizes 50mm to 100mm 

Spring No. PSI Bar
1 5-13 0.35 – 0.9
2 10-25 0.7 – 1.7
3 20-50 1.4 – 3.5
4 40 – 100 2.7 – 6.9
5 90 – 116 6.2 – 8.0

 

OPTIONAL EXTRAS:

Easing Lever and Cover

TYPE OF APPLICATION:

Thermal & Pressure Relief

LINE MEDIA:

Effluent

Sewage Sludge