Purpose: endoscopic as peep device, pressure vessels in petroleum, chemical, pharmaceutical, light industry and other industries has been widely applied. Under the different nominal pressure, the flange and the size of the glass.

Installation requirements : Base can’t leak point, when welding the flange sealing surface flatness is 0.05, firstly should be paid attention to when stud and nut tightening, and torsion should not be too big.