The Multi Sensor Relief Valve (MSRV) is a rapid acting relief valve without the limitations of existing safety valves, allowing a greater flexibility in safety system design. In an over pressure situation the MSRV will respond through utilisation of its safety logic and protect the whole system. Its ball valve design is hydraulically actuated by well pressure from primary sensor points. These points constantly monitor the process pressure, and when it exceeds a pre-determined value, the rupture disc inside the sensor point ruptures and the respective impulse line is energised thus opening the valve. Once actuated, the MSRV will remain open until pressure is applied to the respective closure.
The MSRV is typically installed between the choke manifold and the heater. The purpose is to protect the heater tube bundle from over pressure if the upstream choke cuts out due to sand erosion etc.