... coverA3,304Bellow diaphragmWith Nylon fabric NBRSpring60Si2MnStem & Handspike304,316 Technical Parameter DN253240506580100125150200250300350400Sear diameter mm253240506580100125150200250300650400Rated KV10162540631001602504006301000160019602560Nominal pressure Mpa1.6,2.5, ... openInherent adjust ratio30:1LeakageIII,IVFlange sizeConform with the standard of JB/79.1(2)-94,HG20592-97,GB,ANSI ...