A HIPPS Safety System (High-Integrity Pressure Protection System) protects critical processes in plant sections as chemical facilities or oil refineries from impermissible overpressures. The KÜHME HIPPS Safety System is a robust mechanical unit, which intervenes in the pneumatic control circuit of the Safety Shut-Off Valve (QCV = Quick Closing Valve). Components of the KÜHME HIPPS System are two or three specially designed KÜHME Pilot Valves (PV) as well as one pressure filter regulator. The number of Pilot Valves is depending upon the requested safety level.
The Pilot Valves are 3/2 solenoid valves, which in normal mode release the pass of the control medium to the actuator of the Quick Closing Valve (QCV). They are fitted with a measuring chamber, which is directly connected with the pipeline. Through this connection the upstream pipeline pressure is recorded very accurately. If this pipeline pressure exceeds the preset value of the pilot valve, it switches over. As a result the actuator of the Quick Closing Valve is vented and reliably cuts of the medium supply in the main pipeline within less than one second. The reset of the pilot valve can only be performed after decrease of the pipeline pressure.