Patent ID: 8702057

Claim:
A bellows valve, comprising: a) a valve body; b) a bonnet; c) a packing box; d) packing; e) a stem; f) a disc; and g) a bellows seal assembly; wherein the bonnet is fixedly attached to the valve body by bolts; the stem is attached to the disc; the packing box is sheathed on the stem and fixed to the bonnet; between the packing box and the stem is filled with the packing; on the valve body is disposed with a passageway, on which a disc port is disposed; the disc cooperates with the disc port; the bellows seal assembly comprising an internal bellows, an external bellows, an upper bellows seat, a first lower bellows seat, and a second lower bellows seat, all of which are all sheathed on the valve stem; one end of the internal bellows is fixed to the upper bellows seat and the other end is fixed to the second lower bellows seat; one end of the external bellows is fixed to the upper bellows seat and the other end is fixed to the first lower bellows seat; the external bellows is sheathed around the internal bellows; the first lower bellows seat is sheathed around the second lower bellows seat; the first lower bellows seat is fixed to the bonnet; the second lower bellows seat is fixed to the stem; and the upper bellows seat movably cooperates with the stem.