该阀具有双重密封装置，除填料外还有不锈钢波纹管作密封元件。适用于******、渗透性强、带***性的介质，以及对密封性有严格要求的工业管路上。Thevalvehasdoublesealingdevice,besidespackingstainlessbellowscanbeusedassealingelement,Thevalvecanbesuitabletoindustrialpipelineofeasilybursting,he***yo***osis,rsdioactivitymediaandofstrictuydemandingforsealing.)