Fluid handling – Systems – Multi-way valve unit
Patent
1988-04-22
1989-12-26
Rosenthal, Arnold
Fluid handling
Systems
Multi-way valve unit
251127, F16K 4702
Patent
active
048891630
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a valve assembly comprising a housing provided with an inlet and an outlet for fluid and a spherical body rotatably arranged in the valve housing between the inlet and outlet and mounted sealingly against said valve housing, said valve body being provided with fluid flow passages.
For adjusting a fluid flow, conventional ball valves comprising two throttles in series with a fixed volume enclosed between said throttles have been found to be suitable. However, in high pressure conditions high flow rates are created at these throttles depending on small cross-sections of an inconsiderable extension in the direction of flow which may cause cavitation and a high sound level. The most critical movement in adjustment is when the first passageway especially at the outlet side, opens. In this position the fluid flow should offer a high flow resistance also at low flow volumes.
It is the object of the invention to provide a simple and, at the same time, efficient device for adjusting a fluid flow where disadvantages of cavitation and a high sound level are avoided.
For this purpose a device having the characteristic features defined in the claims is suggested according to the invention.
The invention is described in greater detail in the form of non-limiting examples with reference to the enclosed drawings, wherein
FIG. 1 shows a longitudinal section of a valve according to a first embodiment of the invention,
FIG. 2 shows the valve body according to the section II--II in FIG. 1,
FIG. 3 shows a longitudinal section of the valve body with an opening angle .alpha.=25.degree.,
FIG. 4 shows a section corresponding to FIG. 3 but with the opening angle .alpha.=45.degree.,
FIG. 5 shows also a section corresponding to FIG. 3 with the opening angle .alpha.=56,
FIG. 6 shows a section according to VI--VI in FIG. 7 of a second embodiment of the valve, and
FIG. 7 shows the valve according to the section VII--VII in FIG. 6.
With reference to FIG. 1 the ball valve comprises a valve housing 1 provided with an inlet 2 and outlet 3 and a spherical valve body 4 rotatably arranged in the valve housing 1. The valve body 4 is sealingly mounted against an annular space 5 formed in the valve housing 1 by means of two valve seat rings 6. The valve seat rings 6 are fixedly connected to the valve housing 1 by their outer peripheries and have a clearance to the valve housing 1 at their inner peripheries in order to allow a resilient motion of the valve body 4.
The valve body 4 (FIGS. 1, 2) is rotatable by means of a push rod 7 fixedly connected to the valve body 4 and is provided with two groups of passing flow passages 8, 9. The flow passages 8, 9 with circular cross-sections are preferably grooved in the transversal direction, for example by threads. The groups of passages 8, 9 are arranged on both sides of the horizontal diametrical plane in FIG. 1, the passages 8 having a smaller diameter than the passages 9. The valve body 4 further comprises two smooth flow passages 10 of a larger diameter arranged in said plane. When the valve is closed all the passages end in the space 5. On the other hand, when the valve is open the passages end in the inlet and outlet 2, 3, as is apparent from FIG. 1.
The mode of operation of the valve will be described with the aid of FIGS. 3-5, where FIG. 3 shows the valve body with the opening angle .alpha.=25.degree.. In this case only a few of passages 8 and 9, respectively, are opened. The substantial fluid flow path is marked by arrows. Thus, the fluid flows through a first throttle position in the form of passages 8 into the annular space 5 and around half the periphery in order to thereafter flow out through a second throttle in the form of passages 9. The passages 8 have a small diameter which causes a high flow resistance and consequently a large drop in pressure. The grooves of the passages cause a greater flow resistance and larger drop in pressure simultaneously with a lower flow rate. The above also applies to the passages 9, which, however, have a somewhat larger diameter in
REFERENCES:
patent: 4364415 (1982-12-01), Polon
patent: 4402485 (1983-09-01), Fagerlund
patent: 4540025 (1985-09-01), Ledeen et al.
patent: 4693450 (1987-09-01), Paetzel
AB Tore J Hedback
Rosenthal Arnold
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