| 摘要 |
PURPOSE:To make even the pressing pressure of packing when a valve seat is closed by providing packing having a projection which is inserted into a recess formed on the lockedly engaged part at the end of a plunger. CONSTITUTION:The end surface of a plunger 14 on the side of a valve seat 1 is formed to shape a drumlike lockedly engaged part 14b having a recess 14a, and a valve plate 15 is constituted so as to be capable of oscillating freely around the plunger 14 by inserting the constricted part of this lockedly engaged part 14b into the through hole 15a at the center of the valve plate 15. Packing 16 has a projection 16a at its center which is to be inserted into the recess 14a, and a cap part 16b covering tightly the lockedly engaged part 14b is formed integrally on it. Thus, as the valve plate 15 is capable of oscillating freely, the pressing pressure of packing 16 upon the valve seat 1 becomes even all around the periphery. |
