Fluid handling – With indicator – register – recorder – alarm or inspection means
Reexamination Certificate
2000-08-08
2001-12-04
Rivell, John (Department: 3753)
Fluid handling
With indicator, register, recorder, alarm or inspection means
C251S266000, C251S274000, C073S861740
Reexamination Certificate
active
06325098
ABSTRACT:
DESCRIPTION
The present invention relates to a valve for regulating and measuring the flowrate of a fluid through a header and a bypass duct inside the said header, in which the means for intercepting the fluid are independent of the measuring instrument during their movement in an axial direction towards/away from the bypass duct.
It is known in the art relating to the construction of fluid supply networks that there exists the need to provide multiple-channel header elements for conveying/returning the fluid towards/from end users; an example of these applications consists in water supply pipes for heating installations, in particular of the type comprising underground panels.
It is also known that each of the pipes sections which extend from the header must be provided with a valve for regulating the flowrate so as to be able to compensate for the various losses in head which occur in the various panels owing to their specific size and their distance from the supply header.
It is also known that there are valves which can be applied to said pipes and are able to perform regulation of the flowrate while performing simultaneously a measurement of the latter, said measurement being shown on a calibrated scale present on the valve body.
Examples of these valves are, for example, disclosed in DE 35 09 718 describing a valve which, although performing correctly its dual function (regulation/measurement), nevertheless has a limitation due to the fact that, during regulation, the pressure detection element is movable in an axial direction together with the closing body provided with the graduated scale from where the measurement is read off. This means that, in order to obtain a constant measurement upon variation in the flowrate (greater opening/closing of the obturator), the measuring duct must necessarily be constructed with a cylindrical shape.
This cylindrical shape, however, gives rise to the drawback consisting in the fact that, in these conditions, it is not possible to obtain a substantially linear measuring scale, resulting in the need for a high density of the reading scale, with obvious difficulties as regards correct reading by the user.
In addition to the above, it is known that in said installations the measuring/regulating element (flowmeter) is provided on the return section and the valve for intercepting the fluid together with an electrical and/or pneumatic control actuator is provided on the delivery section.
In this way, however, the main valve operates with the flow directed in the closing direction of the valve and, under high-pressure conditions, irreversible closing of the valve together with consequent interruption in the heating could also occur.
It is thus possible to envisage arranging the flowmeter on the delivery section and the shut-off valve on the return section, but this solution encounters difficulties owing to the fact that the flowmeters of the known type are not suitable for operation on the return section or with the fluid flow entering into the header and flowing out from the supply duct towards the plant, this giving rise to turbulence and cavitation which are the cause of noise and vibration of the measuring instrument which is no longer able to provide a precise measurement.
The technical problem which is posed, therefore, is that of providing a valve for intercepting and regulating the flowrate of fluid supply pipes, which incorporates an instrument for measuring and displaying the value of the said flowrate, is suitable for mounting on the return section of the installation and allows efficient measurement of the flowrate, solving at the same time the abovementioned problems of instruments of the known art.
Within the context of this problem a further requirement is that the valve should consist of a small number of parts and should be easy and low-cost to manufacture and assemble.
These technical problems are solved according to the present invention by a valve for regulating and measuring the flowrate of a fluid through a header and a bypass duct inside the said header, which comprises means for shutting off the aperture of the bypass duct, which are movable axially upon operation of associated actuating means, means for detecting the pressure exerted by the fluid flow, an instrument for measuring the flowrate of the fluid, the scale of which is provided on the external surface of said actuating means, said means for shutting off the aperture of the bypass duct being joined to said actuating means so that rotation of the latter results in only the axial movement of the former and the shut-off means being independent of the measuring instrument during their movement in the axial direction.
REFERENCES:
patent: 3187775 (1965-06-01), Pinnell
patent: 5890515 (1999-04-01), Spiess et al.
patent: 6119724 (2000-09-01), Cazzaniga
patent: 3509718 (1986-09-01), None
patent: 0949486 (1999-10-01), None
patent: 2731492 (1996-09-01), None
Motta Renato
Saini Mauro
Ladas & Parry
Rivell John
Watts Cazzaniga S.p.A.
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