Supercritical forged steel high-temperature and high-pressure gate valve

The supercritical forged steel high-temperature and high-pressure gate valve comprises a valve body and further comprises a support detachably arranged at the top of the valve body, the longitudinal section of the valve body is in an inverted T shape, two valve seats are arranged on the lower side in the valve body in a bilateral symmetry mode, and an opening and closing piece anti-locking assembly for blocking a medium circulation channel is arranged between the two valve seats. The longitudinal section of the opening and closing piece anti-locking assembly is in a wedge shape, and the opening and closing piece anti-locking assembly comprises two valve element bodies arranged in a bilateral symmetry mode, an expansion core arranged between the two valve element bodies in a contact mode, a first clamping piece used for being connected between the tops of the two valve element bodies in a clamped mode and a second clamping piece used for being connected between the bottoms of the two valve element bodies in a