Use a Druck IO620-PRV-P1 pneumatic pressure relief valve (PRV) to set a limit to the pressure you can apply to the pressure devices attached to the pressure station. The PRV is set at the factory to operate at the maximum pressure specified on the label. If the pressure in the instrument is more than the relief pressure set for the PRV, the PRV controls a slow release of the unwanted pressure. The correct PRV helps prevent overpressure and damage to the attached devices.