Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1979-12-17
1982-09-28
Cline, William R.
Fluid handling
Line condition change responsive valves
Direct response valves
98119, F16K 1726, A62B 1300
Patent
active
043513590
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a rapid acting valve for gaseous and liquid media which is maintained in the open position by the force of a spring and closes against the force of the spring in the case of a sudden difference in pressure in the line against the force of the spring. Known rapid acting valves of this type have swivelling flaps or valve disks located in the direction of the flow of the medium which are directly exposed to pressure impacts so that the closing element strikes the valve seat with a high velocity and may thus be damaged.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a rapid acting valve that is not exposed directly to pressure impacts in the line, but still closes at least as rapidly as rapid closing valves of the known type. This object is attained according to the invention by housing the valve in a connecting part which contains a baffle plate extending transversely with respect to the flow of the medium. The baffle plate divides the connecting part into two chambers, each opening through a separate diverting orifice into a common valve chamber. An angular valve disk is located in the valve chamber with an axis of rotation lying in the plane of the baffle plate and between the two adjacent diverting orifices. The angular valve disk is mounted in a readily rotatable manner and at least one of the legs is inclined with respect to the other. The legs of the valve disk are adapted in their outline to one of the two diverting orifices to be closed, and a spring arrangement maintains the valve disk in a rotationally stable open position wherein the two legs of the valve disk are inclined with respect to the planes passing through the diverting orifices. Pressure impacts, resulting from pressure differences within the lines, interrupted by the rapid acting valve are now intercepted by the baffle plate so that an increase in pressure, reduced by turbulence, is created, in the associated valve chamber, which impacts an inclined leg of the valve disk through one of the diverting orifices. Because this leg of the valve disk, by means of its readily rotatable manner of mounting, will give way, the other leg of the valve disk will be rotated against the other diverting orifice, closing it since its configuration is adapted to the diverting orifice associated with it. To this extent, the invention concerns a valve closing only in one direction of flow, for example, an air valve for the ventilation of shelters which must close only when pressure impacts are generated outside the shelter by explosion and when such impacts are to be kept out of the shelter.
When the valve of the present invention is used in a gaseous medium, the conversion of pressure impacts in front of the baffle plate by means of turbulence and the shock wave into a reduced rise in pressure to activate the angular valve disk is particularly apparent due to the compressibility of the gaseous medium. Unexpectedly, the rapid acting valve according to the invention may also be used for liquid media, because here again the diversion of the flow in itself effects a certain destruction of the kinetic energy of the pressure impact, accompanied by the advantage that the leg of the valve disk associated with the diverting orifice to be closed is already in its closing position even before it is impacted by the sudden change in pressure.
The arrangement of the string may be arbitrary, because in keeping with the state of the art it has the function of maintaining the valve disk which according to the invention is angular in configuration and readily rotatable in the open position when normal conditions of flow are prevailing and to return it into said open position, when following a pressure impact normal flow conditions have been restored.
As mentioned hereinabove, in principle only, one of the legs of the valve disk must be designed to close the diverting orifice associated with it, while in such a case the other leg serves merely as the activating arm, being impacted by the diverted fl
REFERENCES:
patent: 2749833 (1956-06-01), Hekelaar
patent: 3111078 (1963-11-01), Breckenridge
patent: 3139811 (1964-07-01), Sickel et al.
patent: 3173356 (1965-03-01), Schierse et al.
Cline William R.
Dennemeyer John J.
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