Under thermal influence the liquid will be warmed up and the pressure increases extremely. To protect the equipment against excessive pressure the PBV opens at a predetermined pressure at an acceptable and riskless limit.
Other applications with the same effect are adapter pieces between different Dry Disconnect Couplings, DDCouplings, hose lines with DDCouplings/DACouplings on both sides e.g. for military applications (logistic supply lines).
Pressure eualizing
and bleeding valve
in Tank unit
This system dissipates trapped fluid pressure into hose coupler without spillage, to allow easy connection.