FI109878B - Pressure activated valve for fire fighting installation - has inlet connectable to high pressure source with outlet and housing having channel connecting outlet having spindle arranged under influence of spring - Google Patents

Abstract

An inlet (4) is connectable to the high pressure source (1) with an outlet (5) connectable to an out-going line, and a spindle (7) is movable between a stand-by position in which the spindle closes connection from the inlet to the outlet, and an activated position in which the spindle opens connection from the inlet to the outlet. The housing of the valve (3) comprises a channel (14) which connects the outlet of the valve to a liquid space (15) under is under the influence of a secondary liquid source (16) with a lower pressure than said high pressure source (1). The valve spindle (7) is arranged to the under the influence of a spring (13) acting in the opposite direction in relation to the pressure action of the liquid space (15) on the spindle (7). The pressure of the secondary liquid source (16) and the force of the spring (13) are mutually adapted in such a way that when the secondary liquid source (16) acts with full pressure on the spindle (7, 17).

Description

f 109878

The present invention relates to a valve for a fire extinguishing system, in particular for such a fire extinguishing system which can operate with a high drive pressure for the extinguishing liquid. In this context, a high pressure means a pressure in the range of from about 30 bar to about 300 bar, whereas conventional low pressure systems have a driving pressure of about 5-10 bar. At least one hydraulic accumulator can be used as source 10 for the extinguishing liquid, to which the output line is connected a number of automatically releasable spray heads.

Known high pressure valves are expensive and in most cases electrically operated, which is a disadvantage in 15 fire situations.

The object of the invention is to provide a new valve, which is reliable without access to electric current and is of simple construction and thus inexpensive.

The valve according to the invention is characterized in that it has a high-pressure fluid inlet and a outlet-connected outlet and a spindle movable between a standby position in which the spindle closes: V connection from the inlet to the outlet, and an active position, in which the spindle opens connection from the inlet to the outlet, that the valve housing has a duct which connects the outlet of the valve with a fluid chamber. that stars • ·. · *. Under the influence of a secondary fluid source of lower pressure than said high pressure source, the valve stem is arranged to act under the action of a spring acting in the opposite direction relative to said fluid chamber pressure action on the spin member, and the secondary fluid source. pressure and the force of said spring are mutually adapted so that, when the full-source secondary fluid source acts on the spin portion via said fluid chamber, the spindle is poured into readiness mode, and the pressure in the secondary source of fluid due to a fluid supply triggered spray head has dropped to a predetermined value, the spring drives the spindle to activated position.

Preferably, a check valve is provided in the duct of the valve housing, which prevents the pressure of the high pressure source from entering the liquid chamber where the valve is in the activated state. Preferred embodiments are defined in claims 3-6 in more detail.

The invention will be described in the following with reference to an embodiment shown in the accompanying drawing.

Figure 1 shows a standby valve.

Figure 2 shows the valve in the activated state.

A hydraulic accumulator with high charge pressure (eg 200 bar) is designated by reference numeral. 1. The accumulator 1, hereinafter also referred to as the primary accumulator, has an exit tube 2, which is preferably provided with a number of openings in its wall, in order to, as described in the patent application. Supply liquid and a mixture of liquid and the accumulator propellant. A tiling tube 2 connected; T: output valve is generally designated by 3, the valve inlet by 4 and its outlet by 5.

The outlet 5 is connected via an output conduit 6 in ·· _ 30 to a number of auto-releasable spray heads, which are not shown in the drawing. v .: With the valve 3 in the standby position according to figure 1, the connection between the valve inlet 4 and the outlet 5 is closed by a valve spindle 7.

3 109878

The valve stem 7 has an axial channel 8 which starts from the inlet 4 and leads to an annulus 9 between the stem and the surrounding valve housing. The cross-sectional area of the annulus 9 is as large as the surface of the spindle 7 which is disturbed under the influence of the pressure in the hydraulic accumulator 1. The accumulating pressure of the accumulator on the spindle 7 is thus reversed (compensated, balanced) by the pressure effect in the annulus 9 in the opposite direction. against the end surface of a piston-like part 10, 10 formed on the spindle, since the opposing end part 11 of the spindle is arranged axially movable through a support member 12, which is fixed in the valve housing 12, in dense sliding abutment. Thus, the pressure residing in the primary accumulator 1 cannot move the spindle 7 in motion.

A coil spring 13 is placed around the spindle 7 and is supported in the valve inlet 4 on one side and against the piston part 10 on the other side; The spring 13 thus strives to displace the spindle 7 upwards in Figure 1 from the standby position, in which the spindle closes the connection from the inlet 4 to the outlet 5 closed.

The housing of the valve 3 has a duct 14 which connects the outlet 5 with a fluid chamber 15 which in turn is connected to a small (e.g. about 0.3 liter) hydraulic low charge pressure accumulator 16 (e.g.

6 - 10 bar), hereinafter also referred to as secondary ·; ; accumulator.

:: The end portion 11 of the valve stem 7 has, or at least abuts, a head 17 which, like a piston: is movable in the fluid chamber 15 between the position according to FIG. 1, in which the head 17 presses against the supporting element 12 which is fixed in the housing 3 '* by which element the spin end 11 is axially movable in tight abutment and the connection from the inlet 4 to the outlet 5 is closed. and the position according to Figure 2, in which the head 17 presses against an opposing shoulder 18 and the connection from the inlet 4 to the outlet 5 is open.

In Figure 1, the spindle 7 is held in place by the pressure in the fluid compartment 15, which pressure acts on the spindle head 5 17. The spring 13 acts in the opposite direction, while the high pressure in the primary accumulator 1, as previously mentioned, is due to the compensation or balancing by means of of the annulus 9 does not drive the spindle 7.

When a spray head 10 with the outlet 5 in contact is released, the secondary accumulator tower 16 begins to supply liquid to the spray head in question. In this case, the pressure in the fluid chamber 15 decreases rapidly, with the pressure effect of the spring 13 on the spindle 7 winning and the spindle starting to move upwards in figure 1 to the end position according to figure 2, against the shoulder 18.

A non-return valve 19 located in the duct housing 14 prevents the pressure of the primary accumulator from entering the liquid compartment in the position according to Figure 2. A hand-operated spare release device, which in Figure 1 is closed and in Figure 2, is indicated by 20.

For larger plants, the invention can of course be applied to any number of hydraulic accumulators and / or high pressure pumps. Regarding spray heads, nozzles, group release and other arrangements: 25 may be applied in any case whatsoever: ·: · indicated e.g. in the international patent applications: T: PCT / FI92 / 00060, ... / 00122, ... / 00155, ... / 00156, ... / 00193, ... / 00213, ... / 00316,. ../00317 and f .; ... / 00330th

Claims (6)

Valve for fire extinguishing apparatus, in particular in connection with a high pressure source, for supplying extinguishing medium 5 to a plurality of automatically triggered spray heads, characterized in that it comprises an inlet opening (4) connected to a high pressure source (1) 10 which is a movable standby mode in which the spindle closes the connection between the air outlet and the outlet and the activated space where the spindle opens the connection from the inlet to the outlet, the valve body (3) comprises a passage (14) 15 connecting the valve outlet to the liquid 15) under the influence of a secondary fluid source (16) having a pressure lower than said high pressure source (1), the valve stem (7) being adapted to be subjected to a spring (13) action. in the opposite direction to the pressure effect of said fluid space • · • ·! * '. * (15) against the spindle (7), and I t · * that the pressure of the secondary fluid source (16) and the force of said spring (13) ·:. * 25 so that when the secondary pressure source (16) acts • · ii: at full pressure on the spindle (7) through said fluid space (15) »* ·!, · * · ', The spindle (7) remains in the standby position; the pressure of the dairy pressure source (16) has been reduced to a predetermined value I ·. *, 30 by a predetermined value, due to the liquid supplied to the spray nozzle, the spring (13) drives the spindle (7) into the activated state. I I Valve according to Claim 1, characterized in that a non-return valve (19) is arranged in the valve body passage (14) to prevent the pressure of the high pressure source from penetrating into said fluid space. (15). 8 109878 Valve according to Claim 1, characterized in that the valve stem (7) in the standby state is arranged on one another to close the valve inlet (4), this end being under pressure in the inlet, and the shaft having an axial channel (8) starts from this end and leads to an annular space (9) formed between the spindle and the surrounding valve body 10, which has a cross sectional area similar to that of the end under pressure of the head directly under the inlet opening of the mandrel (7). to compensate in the opposite direction of the annular space and to the piston-like part of the mandrel (10) through a directional pressure of 15 hours. Valve according to Claim 3, characterized in that the coil spring (13) is arranged around the part of the spindle in which said axial channel (8) is mentioned and that the spring is partly supported against the inlet and partly against the ground. a plurality of piston members (10). «" V Valve according to claim 4, characterized in that the end portion '25 (11) facing the valve inlet opening (4) of the spindle (7) is slidably inserted into the support by a support element (12) fitted in the valve housing. against the head (17) which is arranged to move like a piston in said fluid space (15). Valve according to claim 1, characterized in that the secondary fluid source * i · is a hydraulic accumulator (16). »» · * * · »K> ·> · ·» »·