The purpose of installing a bypass check valve at the PSV inlet of the reactor vessel
Thread Content
The factory deals with polymers, specifically PES polymerization; the reaction is gentle, vacuum is required for polycondensation, and there are not many side reactions. During the on-site inspection, it was found that there was a bypass pipeline at the outlet of the reactor’s PSV; a check valve was installed on this pipeline, and the outlet of the check valve was connected to the outlet of the PSV’s discharge pipeline. My idea is that if a PSV has a bypass line connected to the outlet, then the pressures at both ends are roughly equal. In the case of a partially open PSV, would it not then activate? So what is the use of this bypass?
The bypass valve opens under slight overpressure, while the safety valve activates in case of excessive pressure
Under normal micro-pressure operating conditions, exhaust gases are discharged at low flow rates; in an emergency situation, if the exhaust through the thin tubes does not occur in a timely manner, the safety valve activates
The pipeline allows for slight overpressure leakage (the pressure at which the check valve can open)