The RBM Series 351 is a standard safety relief valve with controlled rise, used to protect closed hydronic heating and cooling circuits, boilers and buffer tanks from overpressure.
Brass body with angle female connections and a 15mm orifice. Supplied factory calibrated at a range of set pressures from 1.5 to 10 bar.
Specifications
| Connections | 1/2" F x 1/2" F or 3/4" F x 3/4" F angle, UNI-EN-ISO 228 |
| Calibration | 1.5, 2, 3, 4, 6, 8 or 10 bar (1/2"); 4 bar (3/4") |
| Max admissible pressure | PS 10 bar |
| Max operating temperature | 110°C |
| Orifice diameter | 15mm |
| Opening overpressure | less than 20% of set pressure |
| Closing discard pressure | -20% |
| Allowed fluid | Water and air (Gr.2) |
| Max power (1/2") | 48 kW at 1.5 bar up to 181 kW at 10 bar |
Features
- Brass body with stainless steel AISI 302 spring
- Elastomer obturator seal and diaphragm
- Controlled-rise opening for stable discharge
- Fixed factory calibration
Compliance: For closed-circuit hydronic heating and cooling systems only. This is not an AS 1357 temperature and pressure relief valve and must not be fitted to a water heater or potable water supply.