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| Rotary lock swtich for switching and resetting a computer |
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| Console switch |
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| Lock mechanism for multi-component data processing equipment |
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| Rocker actuated switch assembly |
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| Burner control with interrupted ignition |
| OF THE INVENTION The preferred embodiment of the invention is illustrated in FIG. 1 and is ... |
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| Plug in regulating power supply |
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| Power controlled computer security system and method |
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| Safety lock apparatus for an electrical plug |
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On-off valve, particularly for insulation by-pass of exhaust gas expansion turbines of catalytic cracking plants
| Details |
Inventors: Mambrini, Luca;
Assignee: Remosa S.p.A. (Cagliari, IT)
Primary Examiner: Lee; Kevin
Assistant Examiner:
Attorney, Agent or Firm: Arent Fox, PLLC
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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DETAILED DESCRIPTION At present, this operation is carried out by a series of passages due, on one side, to operation needing of the upward plant, and, on the other side, to safety needing for the maintenance workers.
Particularly, it is very important that the closure of the circuit toward the turbines occurs along with the opening of a by-pass circuit of the same system, designed in such a way that pressure losses through said by-pass circuit are the same of the losses that, when operating at regime, would have occurred in the system comprised of the turbines and of the relevant circuit.
Furthermore, the passage between the two circuits must almost be immediate, in such a way not to create dangerous pressure rushes that would jeopardize the proper operation of the catalytic cracking plants.
This particular needing is solved by the use of butterfly valves, both on the circuit toward the turbines and on the by-pass circuit, said butterfly valves, thanks to their actuating speed, allow fulfilling the necessary operation requirements.
However, in view of the not perfect sealing of the butterfly valves, due to the constructive mode of the same, safety needing imposes to use them along with the insertion on the line of blind discs flanged to the tube, in such a way to obtain a complete insulation of the circuit portion destined to the maintenance.
The not perfect sealing features of the butterfly valves make also potentially dangerous the operation of introduction of these safety elements.
In this situation it is included the solution according to the present invention proposing to provide an on-off valve for the fully safe insulation of a line, preferably a gas line.
These and other results are obtained according to the present invention, suggesting a valve comprised of one or more shutter covers, sealing engaging on the relevant seats, realized in such a way to ensure a seal remarkably better than that guaranteed by the known valves, and placed in such a way that, when the shutters are in the open position, the presence of the valve on the line involves minimum pressure losses
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Metal Working 
