Valves and valve actuation – Valve actuator is valve casing or extension thereof – Biased valve
Patent
1991-12-06
1993-06-29
Chambers, A. Michael
Valves and valve actuation
Valve actuator is valve casing or extension thereof
Biased valve
251347, F16K 3100
Patent
active
052227162
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a flow control device capable of operating as a stopcock, as a delivery regulating valve, or else as a clack valve, for example a nonreturn valve.
Taps or valves are known in which a ball is held captive between two half-bodies and can be applied against a seat formed on one of the half-bodies through the action of a return spring, or can be moved away from said seat in order to permit a flow through the body through the action of the pressure of the fluid or else through the action of a control means.
These known taps have the disadvantage of having in their interior numerous recesses in which deposits can be formed. These deposits may be detrimental to the sound operation of the tap, and may also pollute the fluid subsequently flowing through the tap, particularly when said fluid is a food, pharmaceutical or other such substance. In addition, in this type of tap sound operation is no longer achieved when the spring is broken or has lost its original resilient properties, particularly through contact with the fluid flowing through the tap. In cases where the closure means must be controlled from the outside, a dynamic seal must be provided between one of the half-bodies and the control member passing through said half-body with a certain mobility. This dynamic seal has to be replaced periodically, and its presence gives rise to additional recesses in the flowpath of the fluid.
The aim of the invention is therefore to propose a flow control device whose internal flowpath has minimum relief.
According to the invention the flow control device, comprising two half-bodies connected to one another with the interposition of annular sealing means and forming together a body defining a flowpath between two openings, each of which is associated with one of the half-bodies, while a closure means is mounted in the flowpath for movement between a closed position, in which it is applied against a seat formed on a first half-body, and an open position in which it is distant from said seat, is characterized in that the closure means is mounted between the seat and the opening of the first half-body and is connected to the second half-body through the annular sealing means, and in that the annular sealing means are axially compressible.
The movements of the closure means are accompanied by corresponding relative axial movements of the two half-bodies relative to one another through variation of the state of compression of the seal between the two half-bodies. There are no longer any specific return means or disadvantages associated therewith. The structure is simplified and its maintenance is facilitated.
An advantageous version of the device according to the invention is provided with means for returning the closure means to the closed position. To serve as such return means, it is advantageous for the axially compressible annular sealing means to be elastically compressible. When this is so, the return means no longer hinder the flow of the fluid and no longer constitute a trap promoting the formation of deposits in the flow control device.
The compressible annular sealing means for effecting the return of the closure means preferably comprise a tubular sleeve defining in its interior a duct connected to an internal duct in each of the half-bodies so as to achieve continuity therewith.
When the flow control device is provided with means for actuating the closure means, these actuating means preferably consist of means for controlling the relative axial position of the two half-bodies.
The flow control device is thus particularly advantageous because the actuating means no longer have to pass through the wall of one or the other half-body in order to be connected to the closure means. There is thus no longer any need for a dynamic seal around a rod actuating the closure means, and thus the corresponding costs of purchase and maintenance, the risks of wear and leaks, and also all the risks of accumulation of deposits in the region of said dynamic sealing means are eliminated.
Other feature
REFERENCES:
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