VALVE SEAT BODY AND VALVE DEVICE

摘要

Disclosed is a valve device (20) provided with a valve body (4) and a valve seat body (5). The valve seat body (5) has a thick cylindrical shape extending in the axial direction (Z), wherein the valve seat body comprises, on its outer peripheral surface, a sealing groove(59) continuing in the peripheral direction, comprises, on its inner peripheral surface, a large diameter portion (51) and a small diameter portion (52) continuing in the axial direction (Z), and comprises a valve seat portion (54) where the valve body (4) is seated, between the large diameter portion (51) and the small diameter portion (52). The position of the sealing groove (59) in the axial direction (Z) is the same as or on the high pressure side of the position of the valve seat portion (54) in the axial direction (Z).