The RBM Series 351 series safety valves are mainly used to control the pressure in hydraulic circuits and heat generators with a useful thermal power of less than 35 Kw and in all cases not requiring the use of a certified valve.

When there is an over-pressure of no more than 10% the value of the calibration pressure, the valve opens a discharge orifice (the force generated by the pressure overcomes the resistance exerted by the valve spring), allowing part of the fluid to be discharged and thereby lower the pressure inside the system.
This orifice is closed by a spring when the pressure value drops to a value within a maximum of 20% Pt.
Triggering of the safety valve is guaranteed even if the diaphragm breaks.
Turning the hand wheel anticlockwise opens and closes the discharge orifice.

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Technical Specification

Brass body.
Stainless steel AISI 302 spring.
Elastomer obturator seal.
Elastomer diaphragm.
Threaded angle connections FF UNI-EN-ISO 228.

Max admissible pressure PS 12 bar
Max operating temperature 120 °C
Orifice diameter 15mm
Opening overpressure +10%
Closing discard pressure -20%
Allowed fluid water-air (Gr.2)