Valves and valve actuation – Fluid actuated or retarded – Compulsory cut-off after flow period
Patent
1991-10-28
1993-02-16
Nilson, Robert G.
Valves and valve actuation
Fluid actuated or retarded
Compulsory cut-off after flow period
137498, F16K 3136
Patent
active
051864320
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a safety valve, more especially to a valve that is intended to be placed in pipes for liquids.
In particular the object of the invention is a safety valve for controlling the consumption of liquid in a network of pipes, whereby the safety valve provides the closing of the network of pipes when an uncontrolled removal of liquid takes place. More especially the invention concerns a valve that is closed as soon as an uninterrupted flow of liquid has existed for a well defined time.
The safety valve is in the first place intended to be placed in the supply of the domestic water mains in order by so doing in the case of leaking taps, leaking pipes or similar to obtain that after a lapse of time the water mains are automatically shut off, such in order to limit water damage and similar to a minimum.
A safety valve to control the water supply in washing machines is known from the French patent application No 2.193.164 which discloses a safety valve in which the driving mechanism for automatically closing the valve is actuated by means of the complete flow through the valve. In this way the displacement carried out by said driving mechanism is proportional to the total amount of liquid which passes through the valve.
Consequently the device as disclosed in FR 2.193.164 shows the disadvantage that the valve is shut in function of the amount of liquid passed through the valve, but not after the lapse of a predetermined period of time.
The present invention relates to a safety valve not having said disadvantage.
The present invention therefore has a safety valve as object, comprising a housing provided with an inlet and an outlet; and a main cut off valve installed in the housing; and is characterized in that it also comprises, at one hand, means working together with the flow of liquid which with the removal of liquid and after a lapse of time shut the main cut off valve, which are reset in their starting position each time an equal or almost equal pressure in the liquid is created at the inlet and outlet of the safety valve, such as a result of the interruption of the water consumption, and which when the main cut off valve is shut, hold it shut as long as a well defined drop of pressure remains in existence over the main cut off valve, whereby these means are driven by means of by-pass, such by means of a channel that is situated apart from the main passage and, at the other hand, a second cut off valve place in the main passage which allows that an almost constant and sufficient drop of pressure is created over the separate channel, even with a very small removal flow.
Preferably the by-pass consists in a channel which provides in a parallel connection over the second cut off valve.
In a preferred embodiment the aforementioned means principally consists of a moving mechanism that after a defined stroke provides for the shutting of the main cut off valve; driving means driven by means of the aforementioned by-pass in order to move the moving mechanism; coupling means consisting of at least a first coupling part and a second coupling part, which provide a coupling that can be engaged and disengaged between the driving means and the moving mechanism; servo-means which engage the coupling means during the periods that a flow of liquid is created at the inlet; resetting means which work together with the movement means and reset the latter in a starting position, each time when the removal of liquid is stopped when the main cut off valve is still opened; and the resetting means working together with the main cut off valve which can bring the cut off valve from shut to open position when the drop of pressure over the main cut off valve becomes zero or almost zero.
In order to show better the characteristics according to the present invention, a preferred embodiment is described hereafter, as example without any restrictive character, with reference to the enclosed drawings, in which:
FIG. 1 shows the safety valve in top view;
FIG. 2 shows a cross-section according to line II--II in FIG. 1;
FIG
REFERENCES:
patent: 1812586 (1931-06-01), Elder
patent: 2025076 (1935-12-01), Spangler
patent: 4916762 (1990-04-01), Shaw
Nilson Robert G.
S.McD. Murphy & Partners Ltd.
Van De Moortele Guido
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