Fluid handling – Control by change of position or inertia of system
Patent
1982-03-15
1984-08-07
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
137 39, 137110, 137462, 251 25, 251 57, F16K 1736
Patent
active
044637730
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a safety shut-off valve automatically shutting off supply of fluid such as gas or the like, when abnormal conditions such as earthquake, leakage of combustion gas and the like are detected, and more particularly to a safety shut-off valve which cannot be reset until it is confirmed that there is no leakage of gas or the like on the secondary side after the shut-off action was once effected.
TECHNICAL BACKGROUND
In order to prevent poisoning, explosion and the like accidents due to leakage of gas or the like from occuring, safety shut-off valve which detect such leakage of gas or the like and automatically shut off the supply of such gas or the like have heretofore been developed. However, such conventional safety shut-off valves have such disadvantages that two electromagnetic valves are required, constructions of the valves become expensive, and controls of such constructions come to be complicated. Besides there is such a disadvantage that a conventional apparatus cannot particularly give an alarm, even if the apparatus was in shut-off condition by the leakage of gas or the like. Furthermore, conventional apparatuses are not provided with such means by which an apparatus cannot be reset until it is confirmed that there is no more leakage of gas or the like on the secondary side after the shut-off action was once effected. Thus, conventional safety shut-off valves are not sufficient in view of safety.
DISCLOSURE OF THE INVENTION
A principal object of the present invention is to provide a safety shut-off valve which can overcome disadvantages of conventional apparatuses as mentioned above and possesses extremely high safeness.
Another object of the present invention is to provide a safety shut-off valve with very high safeness which cannot be reset until it is confirmed that there is no more leakage of gas or the like on the secondary side of the shut-off valve after the shut-off action was once effected at the time when abnormal conditions such as earthquake and the like were detected.
Still another object of the present invention is to provide a useful safety shut-off valve in which either of two electromagnetic valves is replaced by a diaphragm valve and at the same time, an alarm switch is added, whereby the construction of the safety shut-off valve becomes inexpensive, besides raising an alarm signal at the time of shutting-off conditions comes to be also easy.
According to an embodiment of this invention, there is proposed a safety shut-off valve opening a flow path between the primary and secondary sides in case of usual operation, whilst shutting off said flow path in response to an emergency shut-off signal, which comprises an electromagnetic transference device for forcibly transferring fluid from an admission port into a pressure chamber through an exhaust port by means of electromagnetic force, a main valve device consisting of a responsive body in response to the pressure in said pressure chamber and a main valve body connected with said responsive body, and an opening and closing means for controlling the opening and closing of a branch path for discharging the fluid in said pressure chamber by communicating therewith in order to close said main valve deveice by releasing the pressure upon receipt of the aforesaid shut-off signal.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a flow sheet of a gas safety shut-off valve in accordance with one embodiment of the present invention;
FIG. 2 is a longitudinal sectional view showing a specific construction of an essential part of the safety shut-off valve in FIG. 1;
FIGS. 3a and 3b are sequential diagrams illustrating operations of the aforesaid safety shut-off valve, respectively;
FIG. 4 is a flow sheet of a gas safety shut-off valve in accordance with another embodiment of the present invention;
FIG. 5 is a flow sheet of a safety shut-off valve in accordance with a further embodiment of the present invention; and
FIGS. 6a and 6b are sequential diagrams illustrating operations of the safety shut-off
REFERENCES:
patent: 3135281 (1964-06-01), Morgan
patent: 3175500 (1965-03-01), Zeigler
patent: 4075928 (1978-02-01), Bitonti
patent: 4167194 (1979-09-01), Matsuda
patent: 4247077 (1981-01-01), Banick
Inoue Kentaro
Kojima Tadashi
Morozumi Eiichi
Shito Naomichi
Tanaka Kazuyoshi
Blinn Clyde C.
Nilson Robert G.
Yamatake-Honeywell Co. Ltd.
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