Fluid handling – Line condition change responsive valves – Safety cut-off requiring reset
Patent
1975-06-11
1976-04-13
Weakley, Harold W.
Fluid handling
Line condition change responsive valves
Safety cut-off requiring reset
137486, 1375195, F16K 1700
Patent
active
039497860
ABSTRACT:
A safety valve for pressurized fluid or the like includes a housing having first and second chambers and a valve seat formed in the first chamber. Inlet and outlet conduits are in fluid flow communication with the first chamber with the inlet conduit being remote from the valve seat and the outlet conduit being adjacent the valve seat. A first valve, for example a ball, is contained loosely within the first chamber and is arranged to engage the valve seat when there is a sudden pressure drop in the outlet conduit. A slide is contained within the second chamber and is provided with first and second opposed end faces and an opening therethrough which, in one position of the slide, permits fluid flow communication between the inlet conduit and the first chamber. In an alternate position of the slide fluid flow between the inlet conduit and the first chamber is prevented. First and second bypass means, for example passageways formed in the housing, are in fluid flow communication with the two opposed ends of the slide. The first passageway permits fluid flow from the inlet conduit to the second chamber and against the first end face of the slide. The second passageway provides fluid communication between the outlet conduit and the second end face of the slide. When there is a sudden pressure drop in the outlet conduit the ball in the first chamber will be forced against the valve seat thereby preventing any substantial fluid flow therethrough. The first passageway will then conduct the pressurized fluid from the inlet conduit to the first end face of the slide in order to displace the slide to its second position that blocks the flow of fluid through the housing. The slide can be returned to its initial position that permits the flow of fluid through the housing only by the application of an external force to the second end face thereof.
REFERENCES:
patent: 2461830 (1949-02-01), Mahon
patent: 2615676 (1952-10-01), Neubauer
patent: 3055391 (1962-09-01), Shuk
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