DE1816002A1 - Throttle body for control valves - Google Patents

Description

1016002

HONEYWELL GmbH

Frankfurt am Main, December 19, 1968 Pat. O7-OI39

Throttle body for control valves

The invention relates to a Drosselkörpar for control valves with a dm ⁱ ch the valve seat protruding, cylindrical part, which see at the end of a substantially V-shaped widening, continuous slot. A throttle body of this type is shown, for example, in German Auslegeschrift 1 062 "507 as prior art. The edge curve of the V-seat, which extends transversely through the cylindrical throttle body with the same cross-section, is the desired mathematical dependence of the flow rate of the valve The two legs of the ⁶⁹ V "can be straight or curved for this purpose. This type of V-type throttle bodies, like the known FarsbGl throttle bodies, has deficiencies. which "are zurückyufUhren on the" cavitation, especially at high pressure drops, do this. include ex-osion URA corrosion that? can Hegel contour and Innenrauns the valve housing sin often a "body connected it high-frequency oscillations of Drosse! * ?. destruction of seating the Consequently, the invention is based on the object of eliminating these deficiencies by means of a new design of the throttle body.

Starting from a "Dross®lkörp" r of the type mentioned einenge bv "is the invention is the Pich DAT from the RXndern dee slot zv.m Zer'.rum curved surfaces of the cylindrical part extending towards conv-2 ^" ind and 3chlitztlefe less lethal in the center than on the cylinder jacket. Tests under difficult conditions have shown that wherever parabolic or V-shaped bodies of conventional construction show the difficulties mentioned, the "open mouth cone" according to the invention can help

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brought. Its use is particularly advantageous for large Differential pressures, which in conventional throttle bodies usually give rise to cavitation damage.

It has proven to be particularly beneficial when in training of the invention, the slot is rounded at the base and the edge curve of the slot is continuous on the cylinder jacket and face is curved. The curvature can also cover parts of the edge

curve will be zero. One over the entire width of the slot and -depth, rounded embodiment avoids any sharp transitions that lead to material damage as a result of vortex formation AnIaB can give.

In order to also be able to regulate valves with a small throughput coefficient (k _y value) precisely at the beginning of the stroke, it is proposed in a further embodiment of the invention that the slot E on both sides of the cylindrical part be of different depths. This avoids that the slot becomes very narrow at the bottom, which with small strokes could lead to strong accelerations of the medium flowing through and to the dreaded side effects of cavitation.

The invention is explained below with reference to the drawing. Herein shows

Figure 1 shows the throttle body in perspective side view from one side and '

Figure 2 shows the throttle body from the opposite Side, i.e. rotated 180 ° around the cylinder axis.

The throttle body has a hollow cylindrical guide and fastening part 1 and a cylindrical throttle attachment 2. The transition between these two serves as a sealing edge J> and can optionally be provided with an inserted soft seal. The hollow cylinder guide position 1 accommodates the end of the valve rod, which is connected to the throttle body with the aid of a

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Is firmly connected to the cross pin, which is connected through cross bores * of the hollow cylindrical part 1 and through a flush end with this Cross hole of the valve rod protrudes.

The cylindrical throttle Approach 2 is widening with a * ¹ it towards the end face, provided with substantially V-shaped transverse slot. The surfaces 6 extending from the edges 5 of the slot on the surface line to the center of the cylindrical part are convexly curved according to the invention. The slot depth is smaller in the center J than on the cylinder jacket. The slot is ^{rounded at 1} base 8 and the edge curve 5 of the slot on the cylinder jacket and face is continuously curved. As a comparison of FIGS. 1 and 2 shows, the slot on both sides of the cylindrical part 2 has different depths. On the side facing the viewer in FIG. 2, it protrudes closer to the seat edge j5 with its part 9, so to speak, the splice de ^ V "than on the opposite side facing the viewer in FIG. 1, the corresponding part 10 of the edge curve.

The new throttle body can be used advantageously in the valve both when closing and with the flow pressure. If the valve closes with the flow pressure, the flow is against the throttle body from the side, and the medium, for example under high inlet pressure, first passes through one and, when the valve is opened further, through both slits to the outflow side of the throttle body. The medium flow is guided by the a special, inventive molding of the throttle body so that no sudden-Druokwechsel in the range of plug and seat may occur. This avoids the dreaded side effects of cavitation. The medium flow leaves the upstream side of the valve seat almost without a swirl.

If the valve closes against the flow pressure, it flows Medium * from below against the throttle body and is through it 6 curses to the edges; continuous acceleration of the medium in outflow direction

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entry. Again, sudden pressure fluctuations are themselves avoided during the valve stroke. The same favorable properties result as when closing with the Flow pressure. When the valve is closed, the sealing edge rests on the valve seat, while the cylindrical part 2 passes through the valve seat, not shown in the drawing, protrudes. When the valve is opened, the sealing edge J- at the front of the valve seat is removed, and the depth of immersion of the cylindrical part 2 in the valve seat becomes smaller as the stroke increases.

While in the known throttle body, the inner surfaces of the V-slot are curved only in the axial direction, these surfaces of the invention also exhibit in the throttle body according to a curvature in the direction of the marginal curve extending to the edge curve ^r Höhenllnien "in. They are therefore gekrilmmt in both directions.

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Claims (2)

1916,002 claims 1. Throttle body for control valves with a cylindrical part protruding through the valve seat, which has a continuous Schiit widening essentially in a V-shape towards the end, characterized in that
which extends from the edges (5) of the slot to the center (7)
of the cylindrical part (2) extending surfaces (6) are convex and the slot depth in the center is less than on the cylinder jacket. 2. Throttle body according to claim 1, d a d u r c h characterized in that the slot at the bottom (7) is rounded and the edge curve (5) of the slot on the cylinder jacket and face is continuously curved. 3 · Throttle body according to claim 1 or 2, since Durchge indicates that the slot on both seldom
(9, 10) of the cylindrical part (2) has different depths. BATH Blank page