DE3430697A1 - REMOTE CONTROL VALVE WITH INTEGRAL FILTER ASSEMBLY - Google Patents

Description

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3 ^ 30697

Applicant: Teledyne Industries, Inc.
1901 Avenue of the Stars
Los Angeles, California 90067 (USA)

Remote controlled valve with integral filter assembly Basis of the invention

The present invention relates to improvements in
Fluid control circuits and more particularly to fluid operated directional control valves.

State of the art

Remote Directional Control Valves and Associated
Equipment gets dirty in or otherwise
hostile environments and may come into contact with contaminated liquids in systems in which they work. An example of such an environment is a commercial truck ·. Compressed air sy stars in sol-. Vehicles used for brakes and other servo functions can become soiled with dirt, water, oil and similar contaminants.

U.S. Patent 3,215,163 issued to Henderson discloses a remotely operated directional control valve of a type such as it can be used in a control system for operating the gears in the transmission of a commercial truck. The remote-controlled one reacts to such an application Valve on a remote control valve located in the driver's cab

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which is operated manually by the driver. The reliability of these valves and their circuits can be adversely affected by contaminates entering the circuit.
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Summary of the invention

The invention relates.sich to a remote controlled directional Control valve with built-in filter device, welehe the risk of contamination of the valve and the corresponding Control circuits reduced.

The filter device is arranged in the body of the directional control valve above a manifold which is also formed in the valve body. Thereby, the internal valve components are _seibst> as well as components of the valve and of the circle, which are arranged outside the housing, is protected by the filter device. The filter device comprises a hollow cylindrical filter element which is arranged in a corresponding recess. Der'Einlaß the filter includes a sharp bend in the flow path, _v by the large particles in the liquid stream entering the filter can be separated, so as to protect the filter against premature soiling. The geometry of the inlet, the filter and the manifold require mounting positions in which the inlet is lower than the filter so that water and other polluting liquids and solids do not get into the filter element and can contaminate it. The filter capacity of the filter element is ideally sufficiently fine so that water droplets can be separated out.

The filter element is in the form of an inverted dome or a cylinder closed at one end. The open one The end of the filter element is appropriately sized by means of a

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Spring resiliently pressed against a seat. The pen is like this:

dimensioned that they the filter element at a predetermined j

The pressure differential separates from the seat. So happens if the j

The filter element is dirty, not an Immediate loss!

the pneumatic control, since air can bypass the filter element j when it is lifted from its seat.

Brief description of the drawings

Fig. 1 is a top plan view of a remote controlled judge I Tetes control valve constructed in accordance with the invention is; j

Figure 2 is a side view of the valve of Figure 1; !

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Fig. 3 is an end view, partly in section, of the ven- [

tils from Fig. 1; i

Fig. 4 is a_cross-section along a longitudinal plane of the Valve from Figure 1; and

Fig. 5 is a schematic fluid control circuit in which the valve of the present invention of Fig. 1 is used.

Description of the preferred embodiment

The drawing shows a remote controlled directional control valve 10, which will be described in detail below, and a liquid control circuit 11 in which it is advantageous is used. The control circuit 11 contains in addition to: valve "10 a source for compressed air in the form of a Air compressor 12, a collection tank 13, a pneumatic Switch 14 with piston and cylinder, a hand-operated valve 15 and pneumatic lines that connect these components.

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The valve 10 includes a housing 18, an end block 19, a cylinder flap 20 and a "spool 21. The housing 18 consists of cast iron or other suitable material. The housing 18 has a longitudinal bore 24 with a stepped Diameter, with a reduced diameter 25 and an enlarged diameter 26. The end block 19 has a cylindrical bore 27 which is arranged coaxially to the housing bore 24 and which has a cross-sectional area which is preferably twice as large "as the reduced one Housing diameter 25. The end block 19 is soluble attached to the housing 18 by screws 28.

At the blind end of the reduced housing diameter 25 is an inlet port 31 is provided (Fig. 3). This inlet port 31 is internally threaded so that it can be connected to a Supply line 32 (Fig. 5) can be connected. It will be understood that in use the preferred orientation of the valve 10 corresponds to that of FIGS. 3 and 4, where it is indicated in the upright position. In this orientation, the housing bore 24 runs horizontally. If here the orientation of various elements of the valve is discussed, this is done with reference to the preferred one Alignment. The inlet port 31 has a blind cylindrical bore 36 which extends horizontally into the interior of the Housing 18 leads from the threaded opening. A short vertical circular bore 37 provides communication between inlet 36 and a larger cylindrical cavity 3 The bore 37 and the cavity 38 are coaxial and their axis is radial to the horizontal axis of the inlet opening 3 6. A horizontal bore or manifold 39 "which is perpendicular to the housing bore 24, communicates with the cavity 38 and the inner end of the reduced housing diameter 25 and forms an outlet opening 43 at the end opposite the cavity.

The outlet 43 is internally threaded to connect to a

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Line 44 of circuit 11 to be connected. An op- \

The functional outlet 45 is through an opening with an inner gevin- f

de ensures that the perpendicular to the outlet end of the ver t plate 39 is arranged and is in communication with him.

A cylindrical valve slide 48 of stepped diameter is disposed in the bores 24, 27 of the housing and the end blocks. O-rings 49, 50 made of elastomer are arranged in corresponding grooves at opposite ends of the slide 48 in order to form liquid-tight sliding seals with the bores 25 »27. As shown in Fig. 4, the right end of the slide 21 has an axial passage 53 which communicates with a transverse bore 54 through the central part of the slide. A seal 57 in the transverse bore 54 contains a sliding seal 58 provided with openings, a compression ring 59 and a slide shoe 60. The slide seal 58 and the slide shoe 60 are equipped with O-rings to seal off respective areas of the transverse bore 54-. The spring 59 holds an upper surface of the sliding seal 58 _t against the lower surface of the cylinder cap.Depending on the * axial position of the slide 21, the transverse bore 54 and the sliding seal 58 connect one of two openings 62, 63 in the cylinder cap 20 with the slide passage 53 and the manifold 39. A pair of outlet ports 64, 65 (Fig. 4) alternately vent the respective ports 62, 63 through the housing bore 26 and around the valve assembly 21 are provided by corresponding grooves 67-68 clearances. The control openings 62, 63 are individually connected to working chambers of the switch 14 with piston and cylinder

Lines 69, 70 connected. . ;

The manifold 39 is connected to the valve 15 through the line 44 and optionally through this valve to the cylinder bore 24 of the control valve 10 via a control line 74. ' The valve 15 is a classic three-way valve

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with two positions, which serves as the main control valve for the remotely controlled directional control valve 10 '. The valve 15 is manually operated by moving a control head 76 towards or away from its housing. 5

With particular reference to FIG. 3, a filter element 81 is shown which is arranged in the cylindrical cavity 38. '- ■ - .Vorzugsweise the filter element has the general shape of an inverted dome or box. An economical form of the filter element 81 is a classic pleated paper element that is commercially available and is typically used in gasoline lines such as those used in automobiles. On its lower peripheral surface, the filter element 81 rests on a base region 82 of the cavity 38. The interior of the filter element 81 is open to the vertical bore 37 so as to receive an incoming air stream flowing through the inlet 31. The upper end of the filter element 81 is closed. The filter element 81 is resiliently held against the lower end or seat of the cavity 38 by a compression spring 83. The resilient compression spring 83 ' is sized to exert a predetermined vertical downward force on the filter element 81. The Cavity 38 is closed and the spring 83 is held in place by a releasable locking plug 84 which is screwed into the cavity, and as shown, the plug 84 is generally inverted in shape and is provided with a generally cylindrical hollow skirt 85 which is coaxial is arranged to the filter element 81 and surrounds a substantial part of this filter element 81 in order to create a filter area which is arranged in the main housing 18 with a minimal additional weight.

It will be understood that, in normal operation, air flowing through inlet port 31 will rotate and vertically

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passes through the circular bore 37 in the axial direction into the interior of the filter element 81 and then flows radially outward through the folded paper filter to the outside. Air leaving the filter element 81 finds its way into the subsequent manifold 39. The paper filter 86 has a relatively small pore size, e.g. B. in the order of 5 M

The control system 10 described finds application in large overland trucks. For such purposes, the cylinder • The switch 14 can be mounted on the transmission of the truck. to switch it between high and low gears in response to changes in the position of button 76 of the control valve 15 to move, which can be arranged in the cab of the truck - 15. The air compressor 12 and the Containers 13 can be those used for the truck braking system.

When the circuit 11 is in operation, the valve 10 being in the position shown in FIG. 4, an air pressure is maintained in the large bore 27 the slide 21 in the upright position shown. The slide 21 is in this position held because the system pressure from the container 13, which acts in the large bore 27, a right-hand force exerts on the slide. When the slide 21 is in the upright position, air flows out of the manifold 39 through the slide passage 53, the transverse bore 54, the opening 62 and the line 69 to the respective working chamber of switch 14. At the same time the chamber is on the opposite The end of the piston of the switch "14 via" the line 70 is released.

When the control button 76 of the main control valve 15 is moved to the other position, the main bore 27 is vented, so that the slide 21 moves to the left out of the in

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4 can move in response to the force developed by the pressure of the system air vird, which acts on the right end face of the slide in the smaller bore 25. In this state the system air pressure in the manifold 39 to the other port 63 by applying the transverse bore 44 passed to this opening. As a result this causes the switch 14 with piston and cylinder. "to change position as a result of reverse printing. conditions in the working chambers at opposite ends of the piston. As already indicated, this change is made in the position of the switch 14 with piston and cylinder used to do a job such as B. to change the speed range of the corresponding transmission .

The above description shows that the filter element 81 acts sam as the internal working elements of both the valves 10, 15 as well as the switch 14 with piston and cylinder protects. Due to its relatively small porosity, the filter element can 81 Dust particles of every significant size as well as droplets. »Separate from oil and water. Besides, it's relative Geometry of the inlet area 31 and inverted filter 81 particularly favorable to prevent premature contamination of the filter element to delay. The right-angled relationship between the inlet bore 36 and the vertical opening 37 verur- ' gently, a turbulence and a change in the drive, so that all relatively large particles fall out of the air flow and can collect in the blind ends of the holes 3 6 ■ Furthermore, the spring 83 in the filter element 81 allows

load valve to work if the filter becomes contaminated prematurely is how this z. B. can happen by failure of the oil ring in the compressor 12, causing an oversized Amount of oil can get into parts of the circle. In particular the spring 83 causes a vertical hold-down force the filter element, creating a pressure drop through the filter

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of 5 psi is possible. A larger pressure drop due to contamination of the filter 81 can reduce the force of the Overcome spring 83 and cause the lower filter surface 87, lift off the seat 82 and bypass the filter element.

While the invention has been shown and described with reference to a particular embodiment, it has done so primarily for purposes of illustration and not limitation and those skilled in the art will appreciate further variations and Discover changes to the specifically represented design, all of which are within the spirit and scope of the invention. Accordingly, it is not intended that the patent be limited to the scope and extent of the specific embodiment shown and described is limited be, nor in any other way inconsistent with the extent of progress that is given by the present invention.

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Claims (5)

1G54658 Applicant: Teledyne Industries, Inc., 1901 Avenue of the Stars, LOS ANGELES, California 90067, USA 1.) Remote Directional Control Valve for a fluid control circuit that is a main control valve for adjusting the directional control valve, the main control valve and the directional control valve spaced apart and connected by a pair of fluid lines from one of which is a control line, the fluid flowing from the other line to the main control valve 1 '/ was fed to the directional control valve, and the main control valve optionally between two positions is to be adjusted and in one of these positions a fluid pressure in the control line prevails and in the other position the control 5Ό line is relaxed, with a housing, a Inlet and a manifold in the housing communicating with the inlet, with which the other line is connected, thereby marked net that a filter (81) in the housing (18) between '^ J inlet (31) and distributor (39) is arranged in such a way that "it can filter fluid that is in the directional control valve (10) and flows in the main control valve. 2.) Valve according to claim 1, characterized in that "0 the housing (18) has a bore (24) with sections (25,26) contains smaller and larger diameter, in which a slide (21) sits, the openings to be controlled in the housing (18) according to its position optionally with radial passages (67,68) in the SchievKJ Can connect via (21), and also an inlet (31) EPO COPY at one end of the housing which is in connection with the section (25) of smaller diameter of the bore (24) stands, an outlet (43), a manifold (39) in the housing which connects the inlet (31) with the section (25) smaller diameter and the outlet (43) connects at least one control opening (62,63), which with the section (26) larger diameter of the bore (24) is connected and a fluid pressure from a spaced valve delivered through the outlet and a filter (81) in the housing, which the fluid entering at the inlet before entering the manifold filtered, the filter being adapted to remove the internal elements of the valve as well as the arranged valve, which is arranged between the outlet and the control inlet and filtered Discharges fluid from the control orifices. 3.) Valve according to claim 1 or 2, characterized in that the filter (81) by means of a spring (83) is pressed against a seat (82), the spring (83) being designed and arranged so that the filter is lifted from the seat when a predetermined pressure drop occurs through the filter. 4.) Valve according to one of claims 1 to 3, characterized in that the filter is in the shape of an inverted one Has shell and is arranged above the inlet (31). 5.) Valve according to claim 4, characterized in that the inlet (31) has a passage in the at right angles to an opening (37) at the inlet of the filter (81). -3- : EPO copy 1 6.) Valve according to claim 5, characterized in that the opening leading to the inlet of the filter (81) (37) runs vertically. EPO-COPT J.