Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1992-03-02
1994-03-15
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
137498, F16K 1730
Patent
active
052938980
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a safety closing device for gas pipes comprising a valve which is capable of being pressed against a valve seating in a housing, especially a tubular housing.
For water pipe systems devices have already been disclosed which are placed between an offtake tap and a consuming device connected thereto by a hose for the purpose of ensuring that, if the connected hose bursts, an excessive amount of water cannot flow out. Such water cut-off valves take into account the fact that, when a hose bursts, the pressure drops quickly and at the same time a greater-than-normal quantity of water is taken. It is thus ensured that, in the event of a sudden drop in pressure, only a certain maximum amount of fluid flows out, whereupon the safety valve closes. With such devices it is possible, for instance, to provide a safeguard for household appliances such as washing machines, dishwashers and the like which are usually connected only to flexible hoses.
In the case of gas pipe systems it often happens, when construction work is being carried out on buildings, that the pipe system is accidentally damaged. In such cases there is the possibility of an unintentional emission of gas and hence a danger of explosion. In gas pipe systems, too, there are consuming devices, such as heating systems, which are designed to take gas for the burners from the pipe system until the desired temperature is reached. Monitoring of such gas pipes by means of a gas meter does not achieve the aim because, depending on the outdoor temperature, heating systems have to be supplied with gas for a longer period and hence with a larger total quantity of gas at times of lower outdoor temperatures than when they are higher.
The purpose of the invention is to make a safety closing device for gas pipe systems of the kind mentioned at the beginning which enables damage in a pipe system to be detected without causing premature shutting-off of the gas pipes if a consuming device needs to receive a quantity of gas corresponding to its rated output for a fairly long period of time. The safety closing device according to the invention is intended, in particular, to be suitable for safeguarding multi-family houses in which a large number of consuming devices take gas from the gas pipe system at irregular times. In order to solve the aforesaid problem the safety closing device according to the invention is primarily based on the fact that the valve, as a disc valve movable in the axial direction of the tubular housing, is movably supported against the force of a spring, that the cross-sectional area of the valve head is smaller than the clear cross-section of the housing and is kept at a distance from the inner wall of the tubular housing and that the gas supply connection is provided on the side of the valve head facing away from the spring. As a result of the fact that a disc valve movably supported against the force of a spring is provided, a certain differential pressure is predetermined through appropriate setting of the initial spring tension or elastic force, this differential force being characteristic of damage in the subsequent pipe system. As soon as the pressure in the subsequent pipe system falls for a short time below a limit value, the safety closing device according to the invention closes and, as only mechanical parts are provided for the safety closing device, such a safety closing device remains capable of operation even in the event of natural catastrophes such as, for instance, earthquakes.
Alternative systems which require remote-control valves which are actuated, for instance, depending on signals from a gas detector, rely on an electric circuit which is in working order and thus as a rule become inoperative at the latest if at the same time electrical circuits are destroyed or the power supply breaks down. On the other hand, the design according to the invention is characterised by the fact that it remains independently capable of operation even in the event of catastrophes. The safety closing device according to the i
REFERENCES:
patent: 1163128 (1915-12-01), Braver
patent: 2404924 (1946-07-01), Sacchini
patent: 2526346 (1950-10-01), Goldinger
patent: 2926690 (1960-03-01), Martin
patent: 3583435 (1971-06-01), Stewart
patent: 3794077 (1974-02-01), Fanshier
patent: 4934405 (1990-06-01), Brownfield
Nilson Robert G.
Pipelife Rohrsysteme Gesellschaft m.b.H.
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