To provide the same kind of valves with versatility of configuration different up to now.

A closure member 3 can move in the direction going from an open position to an closed position and in the reverse direction by a valve drive device. The closure member 3 is constituted such that a first closure member part 8 of the closure member 3 abuts on a first valve seat and a second closure member part 9 of the closure member part 3 abuts on a second valve seat 7 in a closure position. The first closure member part 8 and the second closure member part 9 are arranged relatively movably in the closing direction 5.