... Valve Series Palatal type gate gate valve For manual, SEF DEF for electric, Y for electric hydraulic, pneumatic QEF for Palatal type ... self-locked. Nantong China-Mining electric hydraulic palatal type gate using electrohydraulic push rod, full hydraulic transmission, ... parametersFour, transmission device parametersFive, the working principle Palatal type valve is made up of ontology, fan-shaped disc, ...