Metal bidirectional sealing valve cavity with safety relief function

The invention provides a metal bidirectional sealing valve cavity with a safety relief function. The metal bidirectional sealing valve cavity comprises a valve rod, a valve cavity body, a supporting mechanism, an auxiliary mechanism and a fixed seat. The valve rod is connected to the upper end of the fixed seat through a bearing, the fixed seat is welded on the upper end of the annular side of thevalve cavity body, the supporting mechanism is fixed to the valve cavity body, and the auxiliary mechanism is connected to the right side of the valve cavity body. The supporting mechanism comprisesan upper clamping ring, a nut, an upper connecting plate, a lower connecting plate, a T-bolt, a supporting plate, a base plate, a hollow column, a shunt hose, a lower clamping ring, a plug pin rod, ahollow pull rod, a fixed box body, a heat insulation cloth and a rotating rod. The auxiliary mechanism comprises a rack bar, an L-shaped guide bar, a left fixing ring, a rubber pad, a fixing bar, a spring, a right fixing ring,