Electronic Proportional Pressure Relief Valve
A cross-sectional drawing of a proportional pressure relief valve is shown in Fig. 1. It is essentially a single variable orifice controlled by a proportional solenoid. A magnetic force proportional to the applied input current is generated and reacted by the pressure force. Typical steady-state performance curves are shown in Fig. 2. Since the valve is a single stage device, flow rates are limited to around 5 litres/min. To control higher flow rates, the valve can be used as a pilot to control the vent flow of a hydro-cone type relief valve as shown in Fig. 3. Typical steady-state performance curves at 100 litres/min flow are shown in Fig. 4.
Fig 1.Proportional pressure relief valve.
Fig 2. Proportional Pressure Relief Valve Characteristic
Fig 3. Two Stage Proportional Pressure Relief Valve
Fig 4. Two Stage Electronic Proportional Pressure Relief Valve Characteristic
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