Pilot operated safety working principle of the pneumatic valve? And what are the advantages of pneumatic valve spring loaded safety compared commonly?

pneumatic valve pilot operated safety is the safety of the structure of a novel pneumatic valve, mainly used in petroleum, chemical, electric power, metallurgy and city gas and other fields, is the pressure equipment, containers, or the best overpressure protection device on the pipeline. Changes its main advantage is the spring direct action to guide pneumatic valve indirect effect, enhances the sensitivity of action, and the main use sleeve piston pneumatic valve, pneumatic seat structure, double seal action of high precision, good repeatability, quick return, can not leak, take high back pressure discharge, long working life, work stable and reliable, it can also be online calibration, still can automatically back to the seat and closed tightly, convenient operation and maintenance.
the guide type safety pneumatic valve and general spring loaded safety valves is what are the advantages? Pneumatic valve -
the guide type safety - In a normal spring security pneumatic valve substrate, add the pilot institutions. Its characteristic is: action accurate and reliable; Sealing performance is fundamental improvement; Open/close differential pressure is easy to meet the requirements; Big kilt, emissions.