Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1996-02-27
1998-01-20
Michalsky, Gerald A.
Fluid handling
Line condition change responsive valves
Direct response valves
13753317, F16K 1504
Patent
active
057092427
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for blocking a liquid flow through a pipe in one direction, said device being provided with a substantially spherical valve body, which can closingly co-operate with a substantially annular valve seat, which is positioned substantially transversely to the liquid flow, whereby means are provided for guiding said valve body in a path between a position in which said valve body is positioned near or against said valve seat (closed position) and a position in which the valve body is substantially outside the liquid flow (open position), whereby a valve casing is present, within which said valve body is located in said open position. A device of this type, frequently briefly referred to as a non-return valve, may for example be used in a waste water treatment plant.
U.S. Pat. No. 3.105.516 discloses such device, whereby the valve body is maintained in its open position by a liquid cushion which is formed by liquid in the valve casing behind the valve body. There is a large space for guiding the liquid to the cushion and a limited space for the liquid flowing from the cushion downstream of the valve.
The pipe in which the non-return valve is mounted may extend both horizontally and vertically, whereby the valve casing extends in an oblique sideways direction from the pipe, usually at an angle of approximately 45.degree. with respect to the pipe, in the direction of the liquid flow. The valve casing forms part of the housing of the non-return valve, which housing furthermore consists of a part of the pipe. when the pipe extends vertically and the downward flow in the pipe is to be blocked, the valve body is positioned above the valve seat and has a specific mass which is higher than the specific mass of the liquid in question. As a result of this the valve body bears on the valve seat when the liquid is not flowing. A downward flow of the liquid is not possible thereby, whilst an upward flow of the liquid will cause the valve body to rise from the valve seat, so that the liquid can flow. The object is thereby that when the rate of flow is higher the valve body is displaced within the valve casing, in an oblique sideways direction with respect to the liquid pipe, therefore.
When an upward flow of the liquid in a vertical pipe is to be blocked, a valve body having a lower specific mass than the liquid in question may be used, whereby the valve body is positioned under the seat. When there is no flow, the valve body is pressed against the valve seat by the upward force, thus blocking the upward flow. When the flow is directed downwards the valve body is pushed away from the seat, so that the liquid is able to pass the valve body.
When the liquid pipe extends horizontally it is likewise possible to use a floating or a sinking valve body. In case of a sinking valve body the valve casing will be positioned at the upper side of the pipe, so that the valve body will sink from the valve casing into the pipe when there is only a small flow or no flow at all. When a floating valve body is used the valve casing will be positioned at the bottom side of the pipe, so that a corresponding result is achieved. The liquid flow in the horizontal pipe is blocked in one direction because the liquid presses the valve body against the valve seat in that direction.
With a non-return valve of this kind timely and correct closing of the valve is important. The valve body usually consists of a metal ball thereby, around which rubber is vulcanized, so that an adequate closing down on the metal seat is achieved. The desired specific mass of the valve body is thereby achieved by drilling holes in the metal ball, for example, or by making it hollow by some other method. Furthermore it has become apparent in practice that the valve body is not or only partially displaced within the valve casing when there is a large liquid flow, as a result of which there is a distinct flow resistance within the non-return valve. Furthermore it frequently happens that the valve body makes a vibrating movement in the liquid flow,
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Metalo Monti V.O.F.
Michalsky Gerald A.
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