COMBINATION VALVE

The invention provides a combination valve which can reduce the force for rotating a handle under the condition that a valve core is separated from a valve seat through a simple structure. This combination valve (100) is provided with: a valve seat (13); a diaphragm valve body (16); a pilot mechanism (101) that uses air pressure to automatically bring the diaphragm valve body (16) into contact with or away from the valve seat (13); and a manual mechanism (102) that maintains a state in which the diaphragm valve body (16) and the valve seat (13) are brought into contact with each other regardless of the supply of air pressure. The combination valve (100) is provided with a piston rod (26) in such a way that a handle (30) is rotated in a way that a manual core rod (31) moves towards a valveseat direction when a diaphragm valve core (16) is separated from the valve seat (13), and the piston rod (26) moves in the valve seat direction relative to the first piston (20) and the second piston(21) which are pressurize