Pilot-operated safety valve - In the general spring safety valve body, an additional pilot agency, so that the safety valve with pilot-operated safety valve and the common type of safety valve dual role. Its features are: accurate and reliable action; sealing performance has been fundamentally improved; opening and closing pressure can easily meet the requirements; action sensitive, large emissions. Safety valve verification procedure First, the safety valve calibration generally sent by the user to the calibration station calibration, special circumstances can be used on-site verification, on-site calibration users should provide the necessary conditions for calibration. Second, the user should be provided for submission of safety valve factory information, equipment design pressure and the use of pipeline pressure, the last calibration report or the equipment inspector issued the verification opinion. Third, the verifier examined and approved the information to determine the setting pressure. Fourth, complete the newly installed safety valve calibration, under normal circumstances, two working days desirable; for large quantities or need to be repaired safety valve, negotiate with the user to determine the completion of the actual situation. Fifth, the verifier according to the calibration content, fill in the calibration records, test reports issued. Sixth, the calibration is completed, checkups notify the user to receive safety valves and inspection reports.
