Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1993-03-05
1995-03-28
Rivell, John
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
251285, 73198, F16K 3700, F16K 5100
Patent
active
054008190
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a measuring and regulating valve especially intended for use in the heating system of a large building, provided with a measuring flange with two connections for pressure gauges, said measuring flange being situated upstreams of the actual stop valve which may be moved into open and closed positions as well into intermediate positions with the aid of an operating means.
Well-known measuring and regulating valves of this type are usually provided with a plug of which the axis forms an angle of about 60.degree. with the flow direction and are therefore quite long, for example 370 mm for a passageway of 100 mm. Then the plug is turned from the open to the closed position and vice versa via a spindle and a knob. Setting such a system involves balancing all resistances in the various lines, so that the minimally required flow rate is attained in every line.
In larger buildings there are often main lines that may each have several side lines. In this case regulation takes place step-by-step, i.e. first the side lines, then the main lines and then the total flow by means of the pump.
Measuring and regulating units based on a butterfly valve are taken less seriously than other, supposed better regulating principles such as plug valves. The combination of measuring flange with butterfly valve is considered to produce poor measuring and regulating characteristics, i.e. low measuring accuracy, a small range of regulation and imprecise to meter owing to the nature of the butterfly valve that has an asymmetric build-up of pressure in the case of partly open positions and, as a result of the short construction length, is placed too close to the measuring flange to enable precise measurements to be taken at said measuring flange.
Nevertheless, the known measuring and regulating valves have demerits that could be eliminated more or less easily if a butterfly valve were to be used anyhow. The main demerits are that the known valves require highly accurate handling in order to maintain the correct regulation set-up, that all the information concerning the setting must be read off from charts and that regulation can really only take place efficiently when two people are involved.
Surprisingly, it has turned out that a butterfly valve used for the purpose described above can still produce very good results if the distance between the valve and the measuring flange is minimally 0.6.times. the nominal passage-way and that, on said valve, a control box is arranged that comprises an adjustable stop that may come into contact with a cam on a sleeve of the operating means so as to restrict the maximum opening angle of the butterfly valve in an accurately reproducible manner, said sleeve being provided on the valve shaft and having an indicator.
With a nominal passage-way of 100 mm the intended distance therefore amounts to 60 mm, which results in an external length of about 120 mm. This is about 250 mm less than with the comparable measuring and regulating valve of the plug type.
The maximum opening angle of the butterfly valve is preferably adjustable in the area between approx. 75.degree. and 20.degree., the position of 0.degree. ranking as closed position, in which area the invented measuring and regulating valve shows excellent linear regulating characteristics as compared to well-known measuring and regulating valves of the plug type.
In the case of butterfly valves it is quite common for its angular position to be detectable from the outside. Naturally, the invented measuring and regulating valve also requires external visibility of the set position of the stop. One possibility to set the stop consists of the measures that the stop is provided with a horizontal threaded bore and that a screw, positioned in said threaded bore, is supported, in opposite side walls of a cap of the control box, in order to allow the stop to move recti-linearly through a groove in the bottom of the control box while the maximum opening angle is being set. External detection of the position of the stop can be obtained by the
REFERENCES:
patent: 2660057 (1953-11-01), Ackley
patent: 3460800 (1969-08-01), Mikuls
patent: 3537473 (1970-11-01), DeZurik, Jr.
patent: 3575378 (1971-04-01), Fawkes
patent: 3877677 (1975-04-01), Daghe et al.
patent: 4671109 (1987-07-01), Halmi
Keystone International Holdings Corp.
Rivell John
LandOfFree
Measuring and regulating valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Measuring and regulating valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measuring and regulating valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2244352