Ball valve

Abstract: The present finding relates to a bidirectional ball valve usable particularly for ecological frigorific gases, which comprises a valve body housing a ball shutter (5) connected to a control rod (12) sealingly protruding from said valve body. The peculiarity of the finding is in that the ball shutter is turnable by 180° and is provided with a through hole (30) on the side surface, and in the closing step can be arranged in the incoming flow direction.

Description: The present finding relates to a bidirectional ball valve usable particularly for ecological frigorific gases. As known, ball valves are currently present on the market, which are used in frigorific circuits wherein there circulate high-pressure fluids. A vent hole is usually provided in the valves of this type, which is arranged in the upper side of the valve so as to prevent high pressure in the ball, which may create problems when opening the valve. From US 5944051 is known a valve according to the preamble of claim 1. With valves of this type it is not possible to immediately have an indication on the flow incoming direction, with the risk of operating on the part "under pressure", with the serious danger of injury for the operator and of certain environmental damage for the dispersion of the expensive frigorific gas into the air. The object of the present finding is that of solving the above problem by providing a bidirectional ball valve usable particularly for ecological frigorific gases, which should allow simply and quickly carrying out the opening and closing operations by always providing a precise indication of the gas flow direction. Within the scope of the above object, a particular purpose of the finding is that of realising a bidirectional ball valve wherein the control rod should be of the anti-ejection type and wherein the covering caps should be structured so as to prevent the bursting of the closing cap during the unscrewing step caused by possible accidental gas leaks on the control rod. Another purpose of the present finding is that of realising a bidirectional ball valve which, thanks to its peculiar features of implementation, should be capable of providing the highest guarantees of reliability and safety of use. Last but not least, another purpose of the present finding is that of realising a bidirectional ball valve which should be easily obtainable starting from elements and materials easy to find on the market. The above object as well as the mentioned purposes and others that shall better appear from the following description, are obtained with a bidirectional ball valve usable particularly for ecological frigorific gases, according to claim 1. Further features and advantages shall appear more clearly from the description of a preferred but not exclusive embodiment of a bidirectional ball valve, illustrated byway of a nonlimiting indication with reference to the attached drawings. In such drawings: Figure 1 schematically shows an exploded sectioned view of the bidirectional ball valve according to the finding; Figure 2 shows a side elevation view of the bidirectional ball valve; Figure 3 shows a sectioned view of the ball valve on a longitudinal vertical plane; Figure 4 shows a partial view of the valve along a transversal plane, with the valve in closed position; Figure 5 schematically shows a plan view of the valve, in closed position, with a direction of the flow; Figure 6 schematically shows a plan view of the valve in open condition; Figure 7 schematically shows the valve in closed condition with a different flow direction. With reference to the above figures, the bidirectional ball valve, usable particularly for ecological frigorific gases, which is collectively indicated with reference numeral 1, comprises a valve body 2 which inside defines a housing 4 for housing a ball shutter 5. The ball shutter operates against a first gasket 7, which is applied through a traditional screw 8 that connects to the valve body, for example through a laser welding that obtains a real fusion between body and screw, that is, without using material, thus guaranteeing a constant welding penetration and a seal of the frigorific gas. Shutter 5 is provided, in an in se known manner, with an upper milling 10 into which the tang 11 of a control rod 12 engages, which is inserted from inside the valve body and is provided with a flanging 13 that engages against an abutment 14 defined by the valve body. The control rod 12 exhibits housings 15 for housing o-rings 16 which sealingly operate, jointly with a plane gasket 17, which is superimposed to flanging 13. The control rod exhibits a threaded portion 19 provided with a flattened portion 20. Outside the valve body, there is provided a conic washer 21 above which there is superimposed a washer indicating the opening of valve 22, which engages with the flattened portion 20 so as to be integral in rotation with the control rod. Washer 22 exhibits an arrow pointer 22a that can engage against an abutment 23 defined by the valve body, which realises two different closing positions with a phase displacement of 180° with respect to one another, and precisely, of 90° on the right and 90° on the left with respect to the open and free flow position that is determined by a reference notch 24. A peculiar feature of the finding, besides the possibility of carrying out the rotation of the ball shutter by 180°, is that the ball shutter exhibits a through hole 30 on its side surface, which in closed condition is available at the fluid passage pipes. A peculiarity consists in that in closed position, such through hole must be arranged in the flow incoming direction, so that the pressure entering into the ball collaborates to increasing the seal of the same ball, since it actually pushes it against one of gaskets 6 or 7. It must be noted that if hole 30 were arranged at the opposed side, there would be a gas leak from the valve, since the thrust exerted by the fluid could create a blow-by on the upstream gasket, and as a consequence the blown-by fluid may exit from hole 30. To make the operation of hole 30 clear, there is provided an arrow pointer 35, which is applied on the control rod, above pointer 22, so that its point indicates the position of hole 30, thus always showing the flow incoming direction to the operator, since the valve must be closed, thus positioning hole 30 towards the flow incoming direction. It must be added to the above that there is provided a bolt 37 for tightening washer 21, the positioning washer 22, as well as the arrow pointer 35. The valve can be closed by a cap 40, which is provided with an inside threading 41 that engages with an outside threading 42 of the valve body, and which is provided with discharge outlets 45 on the threaded portion, allowing the venting of the possible gas under pressure that may have blown-by through the control rod. The cap is provided with a sealing gasket 44 that operates against the valve body and, when the cap is unscrewed, the possible residual pressure into the cap is immediately released through discharge outlets 45, thus preventing the accidental "bursting" of the cap. Moreover, the cap is provided with a perforated tongue 50 for the application of an optional lead sealing or of a guarantee seal. Moreover, the valve body 2 is provided with a base 51 with threaded housings for carrying out a fastening that reduces the vibrations on the valve, which may damage the welding or create little cracks. From the above description it can be seen that the finding achieves the proposed purposes, and in particular, it must be noted that there is realised a bidirectional ball valve that is specifically usable for ecological frigorific gases which, having the possibility of rotating by 180°, allows adapting to any installation situation, and moreover, it allows immediately displaying the incoming direction of the fluid under pressure.

Claims: Bidirectional ball valve (1) usable particularly for ecological frigorific gases, comprising a valve body (2) housing a ball shutter (5) connected to a control rod (12) sealingly protruding from said valve body (2), wherein said ball shutter (5) is turnable by 180° and is provided with a through hole (30) on the side surface, and in the closing step the through hole (30) can be arranged in the incoming flow direction, characterized in that it comprises an arrow pointer (35) integral in rotation with said control rod (12), for displaying, outside the valve (1), the flow incoming direction. Bidirectional ball valve (1) according to the previous claim, characterized in that said control rod (12) can be applied into said valve body (2) and is provided with a flanging (13) on which operates a plane sealing gasket (17), there being moreover provided annular gaskets and a threaded portion (19) provided with flattened portions (20) for the application of said arrow pointer (35) and of a washer (22) for determining the position of said ball shutter (5). Bidirectional ball valve (1) according to one or more of the previous claims, characterized in that it comprises a covering cap (40) of the portion of said control rod (12), outside said valve body (2), said cap (40) being provided with a female threading (41) connectable to a male threading (42) defined on said valve body (2). Bidirectional ball valve according to claim 3, characterized in that above said female threading (41) said cup (40) is provided with an abutment gasket (44) on said valve body (2), on said female threading (41) there being provided discharge outlets (45) for the quick venting of the gas pressure optionally blown-by through said control rod (12). Bidirectional ball valve (1) according to claim 3 or 4, characterized in that said closing cap (40) exhibits a perforated tongue (50) for the application of lead sealing. Bidirectional ball valve (1) according to one or more of the previous claims, characterized in that on said valve body (2) it comprises a base (51) with threaded housings for fastening said valve. Bidirectional ball valve (1) according to claim 2, wherein said washer (22) exhibits an arrow pointer (22a). Bidirectional ball valve (1) according to claim 7, comprising an abutment (23) defined by the valve body (2), which realizes two different closing positions with a phase displacement of 180° with respect to one another, wherein the arrow pointer (22a) can engage against said abutment (23). Bidirectional ball valve (1) according to any one of the preceding claims, comprising a reference notch (24) determing an open and free flow position of the valve. Bidirectional ball valve (1) according to claim 8 and 9, wherein the two closing positions are arranged with a phase displacement of 90° on the right and 90° on the left with respect to said open and free flow position. Bidirectional ball valve (1) according to any one of the preceding claims, comprising a bolt (37) for tightening the arrow pointer (35).

Inventors: GUERRA DANIELA, GUERRA, DANIELA
Applicants: FLII GUERRA S R L, FRATELLI GUERRA S.R.L.
Application year: 2001
Main classification: F16K5
IPC codes: F16K5