Patent Application
20090001309
The invention relates to a valve for pipelines of fire fighting systems, with a supply line for extinguishing fluid loaded by excess pressure, with a drain line for the extinguishing fluid, with locking means arranged between the supply line and the drain line, and with an actuating means operating the locking means for adjusting the locking means in an open position and a closed position, wherein, in the rest state, the locking means are in the closed position and wherein, in the case of a fire, the actuating means adjust the locking means from the closed position into the open position in such a way that extinguishing fluid flows from the supply line into the drain line.
Pipelines of fire fighting systems are already regularly loaded in the rest state with extinguishing fluid. These so-called wet systems are distinguished in that extinguishing fluid is permanently stored in the pipelines and, in the case of a fire, the extinguishing fluid is rapidly present at the sprinklers or extinguishing spray nozzles.
In order to prevent extinguishing fluid discharging in the rest state from the pipeline system, a shut-off valve is arranged prior to extinguishing spray nozzles and on branches in the pipeline systems respectively. This valve prevents extinguishing fluid being directly present at the extinguishing spray nozzles. In the case of a fire, the valves of the remotely controlled servomotors are opened so extinguishing fluid discharges from the extinguishing spray nozzles.
To detect leakages, the extinguishing fluid is permanently held at a low standby pressure in the rest state. This pressure is generally about 20 bar. In the case of a fire, the fluid pressure is sharply increased, so that, for example, the finest spray can be atomised at the extinguishing spray nozzles.
In order to ensure that the valves also function in the case of a fire, they have to be maintained at regular intervals. To maintain the valves, they are activated. Ball valves are rotated in this case, for example by at least 90°. Incrustations, foreign bodies that have been introduced, swollen seals, damaged seals, corrosions and further causes for the valves becoming stuck are thereby discovered. The valves becoming stuck or other malfunctions of the valves must be determined early in order to be able to ensure reliable operation in the case of a fire.
During conventional maintenance work, the valves are regularly opened. For this purpose, a maintenance technician operates a shut-off valve with a lateral outlet. A test valve is manually opened and extinguishing fluid discharges via the lateral outlet. Thereafter, the valves are manually returned to their original position. The maintenance leads to extinguishing fluid regularly having to be reintroduced into the pipeline and the rest pressure having to be regulated again. The discharge of extinguishing fluid during maintenance work may also be disadvantageous if moisture-sensitive items are stored in the secured spaces.
Because of these disadvantages, the invention was based on the object of providing a valve for pipelines of fire fighting systems, in which a stuck state can be recognised without the extinguishing fluid discharging from the pipeline.
In particular, it is possible to maintain the locking means by means of remote maintenance, in which the monitoring is arranged spatially separately from the valves. Above all, in tunnels of several kilometres in length, it is sensible to control the maintenance of the valves centrally, so that it is not necessary for a maintenance technician to manually check all the locking means individually.
The object derived above from the prior art, is achieved according to the invention in that the locking means are formed in such a way that, during a maintenance operation, the locking means can be adjusted from their closed position by means of the actuating means in such a way that, during maintenance operation, no extinguishing fluid flows from the supply line into the drain line.
It has been recognised that the locking means becoming stuck can be determined in that the locking means are adjusted during maintenance by means of the actuating means. In order to prevent the discharge of extinguishing fluid during this adjustment process during a maintenance operation, the locking means are provided in such a way that they do not allow any fluid communication between the supply line and drain line during the maintenance operation. By applying a starting torque when adjusting the actuating means during the maintenance operation, slight encrustations and corrosions are broken up. The valves are fully capable of functioning again thereafter.
It is particularly preferred if the locking means are formed from a ball valve, the ball valve having a maintenance position between the open position and the closed position. The ball valve may, for example, be formed as a 3/2-way ball valve. In this case, an opening of the valve body may be closed. In a 3/2-way ball valve with a closed opening, the ball itself may be rotated by means of the actuating means by about 180°, without extinguishing fluid arriving from the supply line in a drain line.
In the case of a 3/2-way ball valve, the valve body may be designed such that the outlet bore connected to the valve entry is closed in the case of a 90° rotation of the ball. The ball of the ball valve may have any bore patterns which allow the ball valve to be brought into a maintenance position between the open position and the closed position without extinguishing fluid arriving from the supply line into the drain line.
The ball of a ball valve becoming stuck is then determined easily, in particular when the ball valve during maintenance operation can be adjusted by the actuating means by at least 50°, preferably at least 90°. An adjustment of the ball valve by at least 50° allows a stuck state to be reliably detected. Slight encrustations can be broken up and the capacity of the ball valve to function can remain ensured.
The ball patterns in the ball of the ball valve may preferably be designed such that an angle between an inlet opening and an outlet opening of the ball valve is between 5° and 175°, preferably 90°. The arrangement of openings in the valve body and bores in the ball of the ball valve may be such that they allow an adjustment of the ball valve by at least 50°, without extinguishing fluid discharging.
It is also particularly preferred if the locking means comprise a bursting disc and a shut-off valve. The bursting disc is designed such that it does not burst until there is an increase in the resting pressure. This takes place in the case of a fire, for example. The shut-off valve prevents extinguishing fluid discharging from the extinguishing spray nozzles in the event of unintended destruction of the bursting disc. The bursting disc together with the shut-off valve forms a double security against leakages.
It is also particularly preferred if the shut-off valve is a ball valve or a solenoid valve.
It is particularly preferred if the bursting disc is arranged between the supply line and shut-off valve in such a way that the shut-off valve is dry in the rest state. In this case, the bursting disc is arranged in such a way that it reliably seals the shut-off valve in the rest state from the supply line. The shut-off valve can be adjusted in this case for maintenance work without extinguishing fluid discharging. The extinguishing fluid is held in the supply line by the bursting disc. Only in the case of a fire does the bursting disc burst and the actuating means adjust the shut-off valve in an open position, so a fire can be reliably fought.
It is also particularly preferred if the bursting disc is arranged between the shut-off valve and drain line in such a way that the shut-off valve is loaded with extinguishing fluid in the rest state. In this case, the shut-off valve prevents the bursting disc being inadvertently destroyed by too high a resting pressure. In the case of a fire, the bursting disc bursts after the shut-off valve has been opened as an increased fluid pressure prevails. In the case of maintenance, the shut-off valve can be easily opened by the actuating means. The bursting disc withstands the resting pressure without destruction. Extinguishing fluid does not discharge from the extinguishing spray nozzles as it is held back by the bursting disc.
It is also preferred if the actuating means are operated hydraulically, pneumatically or electrically. Such actuating means may, for example, be electrically operated servomotors.
The position of the actuating means can be determined by means of sensors. These sensors may be, for example, end position switches and maintenance position switches. These switches monitor the control of the locking means. The sensors may also control the working region of the actuating means. The sensors allow remote maintenance of the locking means by means of remote control of the motors and monitoring of the motor function or the position of the actuating means.
Further advantages emerge from the subordinate claims.
The invention will be described in more detail below with the aid of drawings showing embodiments. In the drawings:
a shows a valve with a ball valve in a closed position;
b shows a valve with a ball valve in a maintenance position;
c shows a valve with a ball valve in an open position.
The device 1 for extinguishing a fire comprises an extinguishing fluid supply 2, which comprises fluid containers, not shown in detail, and a high pressure pump. Alternatively, the extinguishing fluid supply 2 may also be equipped with one or more accumulators, in which extinguishing fluid is stored under pressure. Furthermore, the extinguishing fluid may be stored under ambient pressure and only loaded with pressure in the case of activation from one or more accumulators. The extinguishing fluid supply 2 is controlled by a control device 3, which receives the fire alarm signal of a fire detector 4.
In the embodiment according to
In the embodiment according to
The extinguishing nozzles 10, 11, 12, 14, 18, 21, may comprise open nozzle inserts, which are connected to an inflow bore of the extinguishing nozzle via channels formed in the respective extinguishing nozzle. The nozzle inserts, on loading with an extinguishing fluid at a high pressure of up to 300 bar, generate a finely distributed extinguishing spray.
The extinguishing fluid is held in the supply line 7 by the bursting disc 30. It seals the valve 50, in particular the shut-off valve 36 with respect to the extinguishing fluid. In the rest state, the shut-off valve 36 is dry. For maintenance, the position of the shut-off valve 36 can be changed by means of the actuating means 38. For example, the shut-off valve 36 may be formed by a solenoid valve, which has an open and a closed position. The actuating means 38 may be remotely controlled.
By means of the actuating means 38, a switch can be made back and forth between the open position and the closed position. The position of the actuating means 38 is detected by the sensors 40. The actuating means 38 are adjusted from the position shown over the sensor 40a, during maintenance, into a position over the sensor 40b by means of an auxiliary drive (not shown). The sensor 40b detects the adjustment of the actuating means 38 and signals this to a control device, so the adjustment is stopped. The actuating means 38 are then set back into the shown position via the auxiliary drive. The sensor 40a detects that this position has been reached. Encrustations and corrosions in the locking means 36 are determined by adjustment in the maintenance interval.
In the case of a fire, the fluid pressure is increased and this leads to the bursting disc 30 bursting. In addition, the shut-off valve 36 is adjusted in an open position by means of the actuating means 38, so extinguishing fluid can flow from the supply line 32 into the drain line 34 and a fire can be fought.
In the case of a fire, the actuating means 38 are adjusted such that the shut-off valve 36 is in an open position. The extinguishing fluid is applied at elevated pressure on the bursting disc 30, so the latter bursts and the fighting of a fire can take place.
a shows a ball valve 44 in a schematic view. The ball valve 44 comprises a ball 46 with a through-flow channel 48. The ball 46 is adjusted by means of actuating means (not shown). The position of the ball 46 is detected by means of sensors (not shown). In the positions shown in
During maintenance, the ball 46 is rotated into the position shown in
By regularly adjusting the ball 46 from the position shown in
As the functioning of the ball valve 44 is regularly monitored, in the event of a fire, the ball 46 can be rotated without impairment into the position shown in
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2005 014 275.3 | Mar 2005 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2006/060877 | 3/20/2006 | WO | 00 | 10/17/2007 |
