Closing temperatures
Closing temperature ranges [°C] | ||||
DN 15 ½” | DN 20 ¾” | DN 25 1″ | DN 40 1½” | |
BW 31 | 20 – 130 | 20 – 115 | 20 – 110 | |
BW 31 with external adjusting device | 60 – 130 | 40 – 115 | 50 – 110 | |
BW 31 with special external adjusting device 2 | 20 – 110 | 20 – 90 | 20 – 75 | |
BW 31A | 120 – 270 | 100 – 280 | 100 – 270 | |
BW 31A with external adjusting device | 90 – 270 | 70 – 270 | ||
BW 31A with special external adjusting device | 60 – 160 | 30 – 170 | 25 – 85 |
End connections
The equipment can be supplied with the following connections:
- Flange EN 1092-1, B1, PN 40 (DN 15-25 mm (½–1″))
- Flange EN 1092-1, B1, PN 25 (DN 40 mm (1½”))
- Flange ASME B 16.5, Class 150 RF (DN 15-25, 40 mm (½-1″, 1½”))
- Screwed socket G: ISO 228-1
- Screwed socket NPT: ASME B 16.11
Materials
Component | EN | ASTM |
Body | 1.046 | SA 105 |
Cover | ||
Bolts in body | 1.7225 | A 193 B7 |
Thermovit regulator | Stainless steel | |
Body gasket | Graphite/CrNi | |
External adjusting device, BW 31 | 1.4404 | F 316 L |
Sealing ring of external adjusting device, BW 31 | EPDM | |
Gasket of external adjusting device, BW 31 and BW 31A | St | |
External adjusting device, BW 31A | 1.4571 | |
Stuffing box bush, BW 31A | Graphite |