Itissuitableforallkindsofhighandlowtemperaturecoldstorage,springpressurecontrolandgasinletandoutlet.Theinternalandexternalpressureofthecoldstoragecanbebalancedandtheairinthelibraryisfresh,thetasteofthefoodisbetter,thedooriseasytoopen,thepressureincreaseswhenthefrostisfrosted,andthestoreboardwillnotdeformandopenthedoor.(explosion-prooftypecanbecustomized)

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