Cast Steel Relief Check for Liquids (external spring)
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 |
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
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