FI120244B - Valve that regulates a flow - Google Patents

Description

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FLOWFLOW CONTROL VALVE

The invention relates to a valve for controlling the flow of a pressurized fluid comprising a valve body, a bidirectional inlet / outlet for the fluid, and in addition at least one inlet and one outlet, and flow controlling throttling means or the like in the passages between said channels.

When used as a motion damper, the hydraulic cylinder is connected to the pressure accumulator via piping. The attenuator operates in only one way, i.e. there is only one degree of attenuation if the structure is a simple tubular connection as described above. The damping can be adjusted by varying the pressure of the accumulator. Further, it can be adjusted by the throttling of the pipe line, and in particular by the adjustable throttling. The throttling means are valve-like throttling means whose aperture is adjusted by moving a suitable member in the opening.

Two-way flow and adjustable throttle in each direction are required between the damped and the pressure accumulator. Further, there is often a requirement in the damping of the motion cylinder that the damping degree should change during or as a result of the nature of the movement.

• · • '·· When, for example, hydraulic cylinder damping requires all of the above properties, • ·:.:: Existing systems are not compact enough and are not • • * adjustable. simple enough and secure in the case of a directional flow.

The adjustable valve according to the invention solves the above-described problems in the art which occur in the adjustment of the throttle members and their placement in the piping or in the channel passages of the valve. It is a characteristic of the invention that the valve comprises a variety of * * * '' *. * fluid flow regulating throttling means acting on said channel portions and • · * Γ * optionally movable to channel portion positions to replace the previous one * ···· ·· ··· * * flow through the valve.

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An advantage of the invention is that all the necessary component adjustment between the pressure accumulator and the cylinder for the • • · '/ ·· actuation and its adjustment is available in a compact part, which can be adjusted in one adjusting motion, even in the case of bidirectional damping. The damping can also be varied according to the loading of the damped cylinder, for example. By means of the valve according to the invention, the control is simply done by moving the member which produces the desired throttle to a position on the channel portion. In this case, the adjusted stroke rate will also certainly keep its settings.

In the following, the invention will be explained in more detail with reference to the accompanying drawing, in which Figure 1 shows parts of the valve loose.

Fig. 2 shows a rotatable body housing and a part thereof, cut along line II. Figure 3 illustrates a rotatable body housing and a part thereof, cut along line III. Figure 4 shows the parts of Figure 1 together in cross-section.

Figure 5 shows the connection between the pressure accumulator and the damper according to the invention.

Figure 1 shows a compact valve, preferably located at the end of a hydraulic cylinder, for controlling the bidirectional flow between the cylinder and the accumulator. The valve includes a housing body 3, which is a rotatable part, a part with ball valves 5, a spring 6 and a shut-off member 7 and a rotatable cover 1 for the fluid. The fluid 1 also has an opening 17 in the middle of the parts. and 9, from which the ducting leads to each of the check valves, respectively. Each of the counter-valves is provided with a channel through the throttle body 13 at each respective throttle opening 13 to the valve center hole 17 according to the manner in which the body 3 is rotated with respect to part 2. Throttle openings 13 are each a • · ·] · *; cartridges with different degrees of throttle. Due to the non-return valves, the opening 9 becomes the flow • · «....: inlet and the outlet 8 the outlet. The lowest part 4 is used to turn part 3 while adjusting • ·.:. by hand or mechanically in various known ways.

* The lid opening 11 is connected via the opening 12 of the part 2 to the horizontal opening at the bottom of the part 2. . The horizontal channel 10 also leads to the throttle openings 18 in section 3, which are located in the lower row relative to the openings 13. This channel lacks a check valve and the flow * * * · 'can always travel in two directions with even a slight pressure difference. Throttle openings 18 • · ♦ • ^ are provided with different throttle means and always pass through a damping base stream · · **; · *. Also, part 3 may be rotated to a position such that channel 10 is blocked. The basic flow channel 10 is not necessary for valve operation, but it provides a · · ·. **: provides a two-stage attenuation when the second channel opens later.

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Figure 2 is a view according to section II shown in Figure 4. The rotatable part 3 extends to both the hub and the edges. Inside part 3 there is a part 2 to be connected to cover 1. In the passages from the non-return valves it is possible to pair in pairs different injector elements in the housings 16 to provide different degrees of attenuation. At the outside of the part 3, there is a spiral-expanding groove 14 for the ball valve S of the check valve. This solution makes the opening of the check valve different at different throttle openings as the compression force of the check valve spring 6 decreases.

Figure 3 shows a section along line III of parts 2 and 3. The channel 10 is always open if it is at some choke housing 15 The channel portion is without a non-return valve. Basic ducting in both directions through channel 10 If the opening in channel 10 and the choke opening at the position are not sufficient to allow flow to pass, the counter valve of either opening 8 or 9 will open up and another flow channel will open for flow. The throttle members are different from each other and are alternately displaced to flow openings by the same rotational movement of the part 3 as the throttle members in the housings 16 move upwards. The channel 10 is thus connected in parallel with the flow channel through the chokes in the housings 16

Fig. 4 is a sectional view of parts 1,2,3 and 4. Channels 8,16 and 9,16 with non-return valves are the upper channel of a passage through a throttle housing 15 without a non-return valve; side Counter-valve springs 6 not shown with balls 5 and shut-off members 7 Part 3 • · ·; . ·. rotation when changing the throttle ratio between Parts 3 and 1 must therefore be a slip seal.

1 shows a flow diagram of a valve according to the invention between a damped (hydraulic cylinder) and a pressure accumulator. Through the choke housing 15, the flow is free to travel ♦ · · ·: ***: albeit in a throttle direction, in both directions. If, through the choke housing 15, being the only line · · ·, a large pressure drop occurs, another line opens in parallel in the same direction. Vir-: Depends on the direction of the stroke, whichever of the choke housing 16 and the single orifices 8 or 9 will open with the opening of the check valve. Because of the counter valves, only one of the aforementioned lines in turn opens along the line 15,10.

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When the choke members of channels 8.16 and 9.16 can be separately selected with different apertures, • · »V '. it is easy to trace an adjustment such that lines 8 and 9 have choke elements of different apertures. In this way, a different 4 attenuation of the cylinder's inlet and outlet motion is obtained. The adjustment of the damping, i.e. the rotation of the part 3, can be easily done mechanically and, for example, electrically, whereby it becomes fast and, if necessary, is made automatically.

Figures 2 and 3 show mainly the choke housings 15 and 16. Figure 4 shows a throttling member housed in the choke housings 16. The housing 15 is without the throttle member. The throttling means 15 and 16 may, in addition to the re-volver shape, also be in the form of, for example, a rod, whereby the rod is moved linearly with the various throttle members moving to the flow channel.

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Claims (7)

A pressurized fluid flow control valve comprising a valve body (3), a bidirectional fluid inlet / outlet duct (17) connected thereto, and at least one inlet duct (9) and one outlet duct (8) and flow controllers disposed in duct portions between said ducts. throttling means, or the like, optionally movable to throttle member positions in the channel sections to replace the preceding throttling member for controlling flow through the valve, characterized in that the at least one channel is provided with a non-return valve (5, 6, 7); from which the flow is free to travel bi-directionally. Valve according to Claim 1, characterized in that the different throttling means are selectable for positions in the channel sections by rotating the annular throttle assembly (3, 13) to different angular positions. Valve according to Claim 1, characterized in that the different throttle members are selectable in positions belonging to the channel sections by linearly displacing the throttle member arrangement in different longitudinal positions. Valve according to claim 1, characterized in that the channel (10, 15) • · ·; . ·. the part includes a throttle station, to which various throttling members can be moved. · · · · · · · · · · · · · · · · · · · · Valve according to Claim 1, characterized in that for the channel section • ·.:. the non-return valve (5, 6, 7) is spring-loaded and opens in the flow direction ··· »; * * *. flow pressure. • · · Valve according to Claim 1, characterized in that the opening pressure of the non-return valve (5,6,7) is adjustable by changing the compression force of the spring (6), e.g. with different spring extension possibilities at different choke housing (16). • · • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Valve according to claim 1, characterized in that the valve has a casing. the body (3) and the displacement of the throttle members to the various positions are performed from outside the housing body. • · · • ·