| 摘要 |
The invention relates to on-off valve, particularly for insulation by-pass of exhaust gas expansion turbines of catalytic cracking plants, of the type comprising a hollow valve body, an opening for the inlet of the gas into the valve, an opening for the outlet of the gas from the valve, at least a shutter and the relevant at least one seat, the valve being characterized in that it comprises a conduit coupled to the inlet opening and a conduit coupled to the outlet opening, the at least one seat being coupled to the inlet conduit or to the outlet conduit and the at least one shutter having a cover shape and sealing engaging with the seat by a rotatory motion transmitted to the shutter by an actuator by a drive shaft and a drive arm.
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