Valves and valve actuation – Valve – Bodies
Patent
1981-12-10
1984-04-10
Chambers, A. Michael
Valves and valve actuation
Valve
Bodies
251214, F16K 3144
Patent
active
044416890
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Field of the Art
This invention relates to a bonnetless compact design globe valve in which a yoke is directly screw-joined, with no bonnet being provided, to the body of an outside-screw type compact design globe valve having its fluid conduit hole and valve seat formed smaller in diameter than the pipeline connected thereto, thereby to attain a weight reduction of the valve, and also the valve disc is guided along the inner wall surface of the body so that the disc won't vibrate to produce pulsating pressure during control of the fluid, thereby making the valve favorably adaptable to control of a high-pressure fluid.
2. Background of the Art
It is well known that the globe valves are used for controlling the flow rate of a fluid or fluid pressure in pipes. Such valves are also widely used in petrochemical apparatuses where the control of fluid flow rate and pressure is essential. Generally, globe valves have a high fluid resistance and are deemed to be one of the principal causes of fluid pressure loss. In such valves, therefore, in order to minimize pressure loss, the fluid conduit hole and valve seat are usually formed equal in diameter to the pipeline connected thereto. Thus, in these valves, the diameters of the fluid conduit hole and valve seat, which are the fundamental factors for deciding the valve geometry, are regulated by the pipeline involved, so that the higher the fluid pressure to be controlled, the greater must be made the inner wall thickness of the valve, resulting in a greater weight of the valve. Also, in the conventional globe valves, the body and bonnet are combined together by bolting the flanges provided integral to said body and bonnet, respectively, so that for use where the fluid pressure to be controlled is high, it is required not only to increase the wall thickness of the body but also to use thick flanges and strong bolts. Further, a gasket is used at the joint of the flanges joining the body and bonnet so as to prevent leakage of the fluid from this section. Such gasket is provided with sufficient firmness and fastness to prevent leakage of the fluid during its control, but if there once occurs a fluid leakage due to vibration of the valve during its controlling operation or for other causes, there is available no effective measure for checking such leakage. Thus, when a leakage occurs from the gasket joint, there is no alternative but to replace the gasket with a new one by stopping the flow of the fluid in the pipeline and separating the body and the bonnet. Moreover, since the valve disc adapted for directly controlling the fluid at the open edge of the valve seat is not secured to, but rather, is merely loosely engaged with, an end of the valve rod, said disc might vibrate in the course of fluid control to cause generation of a pulsating pressure of the fluid in the connected pipeline, resulting in improper control of the fluid.
OBJECT OF THE INVENTION
This invention has for its object to provide a bonnetless, light-weight compact design globe valve which is free of said defects of the prior globe valves and in which the fluid conduit hole is formed smaller in diameter than the pipeline connected thereto so that the fundamental factors for deciding the valve geometry can be defined with reference to the minimum requirements within a range where the valve can be effectively used for controlling a fluid with a relatively high pressure, and which also has no fear of causing any leakage of the fluid from the gasket nor any possibility to cause vibration of the valve during its fluid control.
DISCLOSURE OF THE INVENTION
A feature of this invention resides in that a yoke is joined directly to the body unlike the conventional valves where said yoke is formed integral with the bonnet or is joined to the separately provided bonnet. This can make unnecessary the thick-walled flanges and strong bolts that are used in the conventional valves for joining the body and the bonnet. It also makes unnecessary the gasket provided at the joint of the body and bonnet
REFERENCES:
patent: Re23985 (1955-04-01), MacGregor
patent: 2274876 (1942-03-01), Trott
patent: 3257095 (1966-06-01), Siver
patent: 3295856 (1967-01-01), Bredtschneider
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