| 摘要 |
PROBLEM TO BE SOLVED: To provide a power shut-off valve device for reliably maintaining gas-sealing property. SOLUTION: In linkage with the opening/closing of a passage 2, a gas supply/ collection means 20 supplies gas to the back side of an elastic body 7 to be stored in a storage area 15 on a valve seat 4 to apply preset pressure thereto and exhausts the gas from the back side to remove the applied pressure. In linkage with the sliding movement of a valve plate 5 with respect to the valve seat 4 in the approximately crossing direction, it exhausts the gas from the back side of the elastic body 7. While the front face of the elastic body 7 is put in such a normal condition that it is recessed as predetermined from seal surfaces 9a, 9b of the valve seat 4 to avoid damage to the elastic body 7, a seal face 5a of the valve plate 5 and seal surfaces 9a, 9b of the valve seat 4 have mutual slide contact for preventing the gripping of a powder in even quantity during the sliding movement of the valve plate 5 for closing the passage 2, in particular, to accomplish seating. On the other hand, the gas is supplied in linkage with the seating of the valve plate 5 to apply preset pressure thereto, whereby the elastic body 7 is elastically deformed and the front face thereof is put in close contact with the seal surface 5a of the valve plate 5 for sealing. COPYRIGHT: (C)2003,JPO
|
