EP1854557A2 - Valve assembly - Google Patents

Abstract

Valve arrangement (1) comprises an actuating device and a pressure control device (17) formed as a modular unit. An independent claim is also included for a high pressure cleaning device with the above valve arrangement. Preferred Features: The actuating device and a pressure control device are provided with a combined housing. The actuating device has a deviation for actuating and blocking a bypass valve (15) and closing body.

Description

The present invention relates to a valve assembly for a high-pressure cleaning device according to the preamble of one of the independent claims, a high-pressure cleaning device with such a valve arrangement and a use of a counter rod for closing force compensation.

High-pressure cleaning devices, also known as high-pressure cleaners, are commonly used for cleaning purposes. A liquid, in particular water, is pressurized by a high-pressure pump and usually discharged via a connected valve gun and nozzle. The high-pressure cleaning devices are usually provided with a valve assembly (unloader), so that when closing the valve gun or nozzle and the pump continues the liquid in the circuit is pumped, so the pump does not work against the closed valve gun or nozzle.

Such a valve arrangement is for example from the DE 198 38 947 C1 which forms the starting point of the present invention. The valve arrangement has a supply line which can be connected on the inlet side to the pump of the high-pressure cleaning device. On the outlet side, a pressure line to a valve gun o. The like. Connected. The supply line is provided with a check valve, which is opened in the conveying operation of the liquid flowing through and closes when closing the valve gun - ie collapse of the liquid flow - also.

Upstream of the check valve branches off a bypass line from the supply line leading to the suction side of the pump or a reservoir for the liquid, so that the liquid is conveyed with open bypass line from the pump in the circuit with low pressure drop.

The bypass line can be blocked by a bypass valve during normal production operation. In particular, the bypass valve has a valve or closing body, act on the fluid pressure in the supply line and the force of a closing spring in the closing direction.

The closing body can be opened by means of a first actuating device. The first actuating device has a switching piston, which is movable against an adjustable spring force from the outlet pressure of the valve assembly against the closing body in the opening direction.

When the valve gun is closed, liquid flow through the check valve collapses and the check valve closes. At the same time arises downstream of the check valve, a pressure pulse which acts on the switching piston, so that it lifts the closing body of its associated valve seat, so the bypass valve opens initially. Next, the bypass valve is then fully opened by a second, the closing body associated actuator. In this bypass mode, the check valve remains closed and the bypass valve is opened and the fluid from the pump is pumped through the bypass line unless it is turned off.

The second actuator keeps the bypass valve open in bypass mode. The second actuating device has a directly connected to the closing body actuating piston, which is acted upon by the output pressure of the valve assembly downstream of the check valve in the opening direction. Accordingly, in order to keep the bypass valve open against the force of a closing spring acting in the closing direction, a relatively large pressure, subsequently holding pressure, upstream of the check valve, that is to say in the pressure line leading to the valve gun, is required.

In the known valve arrangement, a reduction of the pressure in the pressure line in the bypass operation via a pressure control device with a pressure control valve, which is actuated or formed by the second actuator. The pressure reduction to a relatively low, certain lower holding pressure is used for safety, for example, to prevent injuries inadvertent opening of the valve gun. Furthermore, this reduces the material load on the closed valve gun or nozzle.

In the known valve arrangement, the direct coupling of the actuating piston of the second actuator with the closing body requires a relatively high holding pressure and / or relatively high control volumes with correspondingly long reaction or switching times.

In the known valve arrangement, a complete opening of the bypass valve during the entire bypass operation is not achievable. Furthermore, adaptation to different working pressures and / or flow rates is difficult.

The EP 0 668 113 A1 discloses a high-pressure cleaning device with a basically similar valve arrangement with only one actuating device, which is firmly connected to the closing body of the bypass valve. The valve assembly also includes a pressure control valve for decreasing the discharge pressure to a lower holding pressure in the bypass mode, which opens when the discharge pressure downstream of the check valve is greater than the upstream pressure of the check valve by a predetermined amount.

The DE 100 33 075 A1 discloses a similar valve assembly with a bypass for a high-pressure cleaner, wherein in turn a pressure control valve is provided for reducing the pressure of the discharge pressure to a lower holding pressure in the bypass mode.

The present invention has for its object to provide a valve assembly for a high-pressure cleaning device and a high-pressure cleaning device with a valve assembly and a use of a counter rod, wherein in the bypass mode, the holding pressure further lowered and / or the bypass valve in the bypass mode remains fully open and / or wherein the valve assembly universal can be used, individually configurable and / or customizable.

The above object is achieved by a valve arrangement according to claim 1, 3, 5, 7, 9 or 15 or by a high-pressure cleaning device according to claim 16 or by a use according to claim 18. Advantageous developments are the subject of the dependent claims.

One aspect of the invention is to carry out the second actuating device and / or the pressure control device as a modular structural unit, which in particular can be attached to the valve arrangement or integrated into the valve arrangement as required. This allows the construction of a series of different valve assemblies, incorporating certain components as needed, desired and intended use.

Another aspect of the invention is to decouple the second actuating device and / or an actuating piston of the second actuating device from the closing body of the bypass valve. This allows a lowering of the holding pressure to a lower value compared to the prior art, in particular relative to the working pressure, which is preferably very high in the present invention.

Another aspect of the present invention is to provide a mechanical translation and / or deflection between the second actuator and the closing body of the bypass valve. This is conducive to further lowering the holding pressure.

Another aspect of the present invention is to return the control piston controlled for initial opening of the bypass valve back to its withdrawn from the bypass valve rest position to avoid hard Arbeitsschläge. Accordingly, the valve assembly is universal, especially for higher pressures.

Another aspect of the present invention is to couple the bypass valve or its closing body with a working against the ambient pressure counter rod for closing force compensation. In particular, the effective cross section of the counter rod and thus the pressure relief to the pressure load or the effective diameter of the closing body or an associated valve seat are adaptable to keep the closing force acting on the closing body in the closed state constant even at different diameters for different flow rates In turn, a universal applicability of the valve assembly is conducive, especially where largely the same parts for different Pressures and / or flow rates - especially at different diameters of the sealing seat of the bypass valve - can be used.

Fig. 1

eine blockschaltbildartige Ansicht einer vorschlagsgemäßen Ventilanordnung mit einer zugeordneten Hochdrucksreinigungs-Vorrichtung und einer über eine Druckleitung daran angeschlossenen Ventilpistole;

Fig. 2

einen schematischen Schnitt der Ventilanordnung im Förderbetrieb;

Fig. 3

einen schematischen Schnitt der Ventilanordnung beim Übergang in den Bypaßbetrieb; und

Fig. 4

einen schematischen Schnitt der Ventilanordnung im Bypaßbetrieb.

Further advantages, aspects, features and characteristics of the present invention will become apparent from the claims and the following description of a preferred embodiment with reference to the drawing. It shows:

Fig. 1

a block diagram-like view of a proposed valve assembly with an associated high-pressure cleaning device and a valve connected thereto via a pressure line valve gun;

Fig. 2

a schematic section of the valve assembly in the conveying operation;

Fig. 3

a schematic section of the valve assembly in the transition to the bypass operation; and

Fig. 4

a schematic section of the valve assembly in the bypass mode.

Fig. 1 shows an overview of a proposed valve assembly 1, which is assigned in particular a high-pressure cleaning device 2 in the aforementioned sense. In particular, the valve assembly 1 is connected to the high-pressure cleaning device 2, particularly preferably attached to this or built into this or integrated in any other way.

The valve arrangement 1 is connected to a pump 3, in particular a high-pressure pump, the high-pressure cleaning device 2 for supplying or supplying a liquid 4, in particular water or another cleaning liquid. In principle, the valve arrangement 1 can also be connected to another pump, water supply or the like, and / or also be used for other purposes.

The present invention relates in particular to applications in which the pressure of the liquid 4 or the pump 3 is at least 5 MPa, preferably 10 to 50 MPa, in particular about 30 to 50 MPa, or even more.

The liquid 4 is taken in particular from a reservoir, such as a tank 5, but the liquid 4 can also be supplied to the pump 3 in some other way, for example directly via a water hose, a water network or the like.

The valve assembly 1 has a supply line 6, on the inlet side of the preferably high-pressure liquid 4 can be fed. In particular, the valve arrangement 1 or supply line 6 is connected to a connection or inlet 7 to the pump 3.

To the supply line 6 is on the outlet side - in particular to an outlet or terminal 8 of the supply line 6 - preferably a pressure line 9, in particular a hose connected, the or the high-pressure liquid 4 of a valve device, in particular a valve gun 10 o. Like., For the output of the liquid 4 preferably via a nozzle 11, in particular in the form of a spray jet, 12 zuleitet.

The valve gun 10 with the nozzle 11 can also be understood as a nozzle head. Further, the nozzle 11 may optionally directly, as shown in Fig. 1, or in the usual way via a spray lance o. The like. To the valve gun 10 or other suitable valve device, which allows in particular a selective and / or manual opening and closing of the liquid output be connected.

Fig. 1 shows the liquid dispensing and valve assembly 1 in the normal conveying operation. The liquid 4 is discharged continuously and in particular as a jet 12 via the opened valve device or valve gun 10 and connected nozzle 11.

During the conveying operation, the liquid 4 is at a relatively high pressure, which in particular substantially corresponds to said pump pressure, on Outlet 8 spent. This outlet pressure is referred to in the conveying operation as working pressure.

In the delivery mode, the valve assembly 1 can serve to set and / or limit the outlet pressure or working pressure. This will be discussed later.

If the output of the liquid 4, in particular by closing the valve gun 10 o. The like. Locked, prevents the valve assembly 1, that the pump 3 operates against the closed valve gun 10 and possibly builds a lying even above the working pressure in the pressure line 9. This would be very dangerous at pressures of, for example, 50 MPa or more and could lead to injuries, in particular in the case of an unwanted opening of the valve gun 10. Further, this would lead to a very strong and unwanted recoil each time the valve gun is opened. In order to avoid this, the valve assembly 1 with closed valve device or valve gun 10, the liquid 4 supplied from the pump 3 via a bypass or back, in particular in the liquid reservoir or to the inlet or inlet of the pump 3, in particular so that the liquid 4 is preferably conveyed in the circulation with preferably only a low flow resistance. This operation is referred to as bypass operation in the present invention. Accordingly, the valve assembly 1 is often referred to as Bypaßventilanordnung or unloader.

The valve assembly 1 has in the supply line 6, in particular designed as a check valve 13 check valve, which closes or closes automatically in particular when the liquid flow through the supply line 6, in particular by closing the valve gun 10, collapses, ie in the subsequent bypass operation. The check valve ensures that the working pressure or outlet pressure is maintained on the outlet side,

The bypass valve 14 branches upstream of the check valve from the supply line 6, so that the already mentioned return of the pumped from the pump 3 4 liquid in bypass mode and in particular their Promotion in the cycle allows becomes. For this purpose, the bypass line 14 is connected in the illustrated example, in particular via a return line 16 to the liquid reservoir or the input side of the high pressure pump 3. Alternatively, however, the return line 14 can serve only a derivative of the funded by the pump 3 liquid 4 in the bypass mode, without the derived liquid 4 is conveyed in the bypass operation in the circulation.

The bypass valve 15 is controlled in particular in response to the downstream of the check valve pending outlet pressure, as indicated by the dashed line in Fig. 1 and explained in more detail later.

In particular, the valve assembly 1 is formed such that at the transition from the delivery mode into the bypass mode - ie in particular when closing the valve gun 10 - first the liquid flow through the supply line 6 and through the check valve collapses and the check valve - in particular automatically due to corresponding spring preload o - closes. Next arises in the usually abrupt closing of the liquid output, in particular the valve gun 10, a pressure pulse in the pressure line 9, so a sudden or pulse-like increase of the downstream of the check valve pending pressure or outlet pressure. This pressure increase is preferably used to open the bypass valve 15, in particular at least initially, in order to switch the valve arrangement 1 into the bypass operation or to release the bypass line 14.

Preferably, the valve assembly 1 further comprises a pressure control device 17 with a bypass line 18, which bridges the check valve and can be blocked by an associated pressure control valve 19. The pressure control device 17 or the pressure control valve 19 serves to lower the outlet pressure in the bypass operation - ie with the check valve closed - from the working pressure to a preferably significantly reduced holding pressure of, in particular, at most 5 MPa, more preferably about 3 MPa or less. In bypass mode or when the valve gun 10 is closed so only this reduced holding pressure in the pressure line 8 is maintained, which leads to no injury even with an unwanted opening of the valve gun 10, only a small recoil when opening the valve gun 10 result and no excessive material stress caused. One aspect of the present invention is that the holding pressure is lowered very significantly in relation to the very high working pressure, in particular to less than 20%, more preferably to less than 15%, preferably to about 10% or less. This allows a relatively high reduction and high reliability in particular fully open bypass valve 15 in bypass mode.

Said holding pressure 8 is preferably used to keep the bypass valve 15 open in bypass operation. Alternatively or additionally, the holding pressure can also be used to switch off the high-pressure cleaning device 2 or its high-pressure pump 3.

If the liquid output - especially the valve gun 10 - is opened again, first the outlet-side pressure (holding pressure) drops significantly, possibly down to 0. This pressure drop preferably leads to the bypass valve 15 - in particular automatically by spring force and / or by the liquid flow or by the fluid pressure in the supply line 6 and / or bypass line 14 - is closed again. Alternatively or additionally, said pressure drop can also be evaluated or detected in order to turn on the high-pressure cleaning device 1 or feed pump 3 again, wherein the bypass valve 15 is then closed again in the sequence.

With closed by-pass valve 15, the promotion of the liquid 4 through the pump 3 leads to a quasi-immediate increase in pressure in the supply line 6 and corresponding opening of the check valve, so that the promotion of the liquid 4 and output via the pressure line 9, valve gun 10 and nozzle 11 starts again , The conveyor operation is thus resumed and the outlet side of the working pressure is reached again.

It should be noted that the supply line 6 is to be understood in particular as a line in the functional sense, ie as a fluidic connection, and in particular from a plurality of channels, passages, bores o. The like. Can be constructed or formed. The same applies to the bypass line 14 and / or bypass line 18 or other fluidic connections, Lines o. The like. The valve assembly 1 and der Hochdruckreinigungsvorrichtung 2.

Hereinafter, a preferred construction of the proposed valve assembly 1 will be explained with reference to FIGS. 2 to 4, which show the valve assembly 1 respectively in a schematic section, namely Fig. 2 in the conveying operation, Fig. 3 during the transition from the conveying mode to the bypass mode, and FIG 4 in bypass mode. In addition, reference is also made to the prior art described at the beginning for understanding or with regard to possible implementations.

The illustrated valve arrangement 1 has a housing 20, in which preferably all components and components of the valve arrangement 1 are received or to which they are preferably arranged.

The check valve is, as already mentioned, preferably designed as a check valve 13. In the illustrated embodiment, it has a valve body 21 which is biased by an associated spring 22 in the closing direction against a valve seat against the dispensing or main flow direction through the supply line 6. In particular, the check valve is inserted or installed in an outlet 8 forming the bore 20 of the housing. More preferably, the check valve or check valve 13 has no seal, but seals directly with its slope of the valve piston directly on the housing.

At the outlet 8 is preferably a Anchlußeinrichtung, such as a quick coupling, for connecting the pressure line 9, in particular a hose provided.

The valve arrangement 1 further preferably has a first actuating device 23 with an actuator, in particular a switching piston 24, for actuation, in particular for opening a valve or closing body 25 of the bypass valve 15. The actuator or, the switching piston 24 is preferably independent or separated from the closing body 25 movable, so preferably not firmly connected to this.

Preferably, the biasing force is adjustable, for example by means of a spindle adjustment, a preferably rotatable handle 27 o. The like. In a withdrawn from the closing body 25 rest position preferably biased by spring force.

The setting of the biasing force is used to set the maximum Beriebsdrucks the valve assembly 1. The adjustment is made in particular by turning the handle 27. Particularly preferred is a backup or a final set by a lock nut, clamping screw o. The like. Possible, as indicated in the drawing.

Between the main spring 26 and the control piston 24, a shim may be provided in particular for compensating lateral forces in the pressure adjustment.

Preferably, the switching piston 24 extends through an actuating chamber 28 and sealed in an adjacent bypass chamber 29 which is fluidly connected to the supply line 6 with open bypass valve 15 and to the preferably transverse to the supply line 6 extending bypass line 16 forms or forms.

The operating space 28 is connected via a control channel 30 to the supply line 6 downstream of the check valve, so that the outlet pressure act on a piston 28 formed in the actuating chamber 28 from the piston 24 piston area and thereby the switching piston 24 in the direction of the bypass valve 15 and closing body 25 against the force the main spring 26 can bias or move.

The bypass valve 15 has, as already mentioned, the movable closing body 25 and an associated valve seat 32 which is formed or arranged in particular at the transition from the supply line 6 to the bypass chamber 29 or at another suitable portion of the bypass line 14.

The bypass valve 15 is in particular inserted or installed in a bore or opening of the housing 20, in particular transversely to the preferably extends rectilinearly through the housing 20 extending supply line 6 and / or is arranged upstream of the check valve.

Particularly preferably, the bypass valve 15 is formed such that the pressure prevailing in the supply line 6 upstream of the check valve fluid pressure pushes the biasing valve 15 and the closing body 25 in its closed position or position against the valve seat 32 or biases.

The bypass valve 15 preferably has a closure member 25 associated with the closing spring 33, which biases the closing body 25 in the closed position against the associated valve seat 32.

The bypass valve 15 or closing body 25 is preferably a guiding or adjusting means, particularly preferably a counter rod 34, associated with or which is preferably fixedly connected to the closing body 25. In the illustrated example, the closing spring 33 surrounds the counter rod 34 peripherally and is, for example, resisted to a housing part 35, which is preferably releasably attached to the housing 20. The guide means, such as the counter rod 34, preferably extends from the pressurized bypass valve 15 or the pressurized supply line 6 into the outside region under ambient pressure, preferably sealed by the housing 20 or its housing part 35 o , The counter rod 34 thus operates preferably against the ambient pressure, so that, depending on their diameter (through the housing 20 or housing part 35 in the outer space), a partial compensation of the force acting on the shooting body 25 by the fluid pressure force or a corresponding reduction of the resulting , For the closing force relevant surface (area of the effective sealing seat of the bypass valve 15 minus the cross section of the counter rod 34) takes place.

In the illustrated embodiment, the valve arrangement 1 preferably has an optional second actuating device 36 which acts directly or indirectly on the closing body 25, in particular on the guiding or adjusting means, in particular the counter rod 34 or in any other suitable manner.

The second actuating device 36 preferably engages via a deflection and / or translation 37 on the bypass valve 15 or its closing body 25, in particular via the counter rod 34 at. Preferably, this is an inclined plane, in the illustrated example, in particular by a cone 38 o. The like., Formed or fixed to the counter rod 34. The cone 38 or the like is particularly preferably longitudinally adjustable for calibration.

The second actuating device 36 preferably further comprises a retaining piece 39, which is adjustable in particular independently of and / or transversely to the counter rod 34 and inclined to the inclined plane or the cone 38, or the corresponding to the direction of movement or axis of the counter rod 34 is, attacks or slides along, in particular to the counter rod 34 and thus the closing body 25 in the lifted position from the valve seat 32 position (open position) to block or hold against re-closing. Particularly preferably, the inclined plane or the cone 38 is made of plastic, preferably PEEK, and / or in particular of a cap of the holding piece 39, formed. However, here are other gear connections, constructive solutions o. The like. Possible.

Preferably, the actuating direction of the second actuator 36 and the holding piece 39 extends transversely to the direction of movement of the closing body 25 and the counter rod 34. This allows a compact structure and / or facilitates the preferred at least partial decoupling of the movements or non-fixed connection of the parts.

The externally, in particular outside of the housing 20 guided adjusting means (counter rod 34) allows a simple external cultivation of preferably only optionally provided second actuator 36th

The second actuator 36 is in the illustrated example - in particular for (extensive) decoupling of working and / or holding pressure - formed such that the holding piece 34 preferably only with defined, in particular by a biasing spring 40 and a limiting element 41a predetermined bias values on the closing body 25 directly or - as here - act indirectly on the deflection or translation 37 or can be released axially.

The biasing spring 40 acts in particular between the holding piece 39 and a pressure piston 41 of the second actuator 36. The pressure piston 41 is initially displaceable from a rest position, not shown, up to a stop in the direction of the retaining piece 39, so that the biasing spring 40 from a first bias value to a second bias value is stretched. The first bias value is determined by the limiting element 41a, in particular a spacer rod. The limiting element 41a adjoins the maximum distance of the pressure piston 41 from the retaining piece 39, so that in this installed state, the biasing spring 40 is already biased to the first bias value. In the rest position of the pressure piston 41, however, preferably no force on the closing body 25 and the bypass valve 15, in particular the translation 37 and the cone 38, exercised.

The restriction member 41a permits the displacement of the pressure piston 41 relative to the retaining piece 39, whereby the bias of the biasing spring 40 is increased to the second bias value. Thus, then the holding piece 39 is biased with the force corresponding to the second bias value against the cone 38 in the conveying operation.

The displacement of the pressure piston 41 is limited by a housing-side stop or the like. Accordingly, the second bias value as well as the first bias value of the pressure acting on the pressure piston 41 is basically independent.

The displacement of the pressure piston 41 is preferably carried out in dependence on the outlet pressure. For this purpose, a pressure chamber 41 associated control chamber 43 is fluidly connected via a preferably formed of a plurality of holes or channels line 44 to the supply line 6 downstream of the check valve.

The second actuator 36 is preferably operable or controllable by the outlet pressure. At high fluid pressure, in particular the working pressure, the pressure piston 41 is moved toward the holding piece 39, so that the biasing spring 40 and the holding piece 39 is tensioned with the second bias value against the cone 38.

The pressure piston 41 is preferably biased by a return spring 42 in its rest position. This counter-spring 42 preferably causes a lower restoring force than the biasing spring 40. Even with a low holding pressure of the pressure piston remains in the position shifted to the holding piece 39.

When the bypass valve 15 is fully open, the holding piece 39 can retract into the cone 38 or the oblique plane formed therefrom, ie move away from the pressure piston 41 again. Accordingly, it is relaxed by the only acting between the plunger 41 and the retaining piece 39 biasing spring 40 back to the first bias value. The holding piece 39 holds the bypass valve 15 then with the first bias value in the open position, so it is biased against the cone 38 only with the first bias value.

The axial movement of the holding piece 39 and / or pressure piston 41 is preferably limited in each case by axial stops.

The pressure control device 17 is preferably just as optional provided as the second actuator 36 and in particular outside the housing 20 and the valve assembly 1 attachable.

It is particularly preferred to provide the second actuating device 36 and / or the pressure control device 17 as an assembly on the valve assembly 1 and / or modular and in particular to provide this with its own, possibly combined housing.

The pressure control device 17 or the pressure control valve 19 preferably has a valve piston 45 with an associated valve spring 46, which biases the valve piston 45 with a certain force in its closed position against a valve seat on.

The pressure control valve 19 is connected on the inlet side to the supply line 6 downstream of the check valve directly or preferably also via the line 44, so that this also partially forms the bypass line 18. Downstream of the pressure control valve 19, the bypass line 18 then leads to Supply line 6 upstream of the check valve, in particular in the region of the bypass valve 15th

At a higher pressure downstream of the check valve than upstream and at a predetermined by the valve spring 46 force (pressure difference) opens the pressure control valve 19 and leaves liquid 4 via the bypass line 18 until the pressure difference is reached or falls below again. Accordingly, therefore, at the beginning of the bypass operation, the lowering of the discharge pressure from the working pressure to the holding pressure at the outlet 8 of the supply line 6 and thus also in the pressure line 9. In the reverse direction blocks the pressure control valve 19th

The pressure control device 17 preferably has a choke 47 formed in particular by a thin bore in order to limit the speed of the pressure drop from the working pressure to the holding pressure during the transition from the conveying mode to the bypass mode and thus in particular also the return speed of the switching piston 24 to its rest position and preferably low hold. The throttle 47 is preferably arranged downstream of the pressure control valve 19 in the bypass line 18.

Fig. 2 shows the valve assembly 1 in the conveying operation. The liquid 4 flows through the supply line 6 and is discharged at the working pressure (for example 30 to 50 MPa) at the outlet 8 to the pressure line 9 and output via the valve gun 10 and nozzle 11 as a jet 12. The check valve is opened by the liquid flow against the force of the spring 22.

The working pressure exerts in the operating chamber 28 a force on the piston portion 31, so that the force of the main spring 26 overcome and the first actuator 23 and the switching piston 24 is advanced in the opening direction against the closing body 25 and is. However, the bypass valve 15 (normally) remains closed in the conveying mode, the closing body 25 is not (yet) lifted off its valve seat 32. In particular, the liquid pressure acting on the closing body 25 in the supply line 6 and the closing spring 33, which act in the closing direction, ensure that the bypass valve 15 (normally) remains closed in the conveying mode.

However, when the outlet pressure is too high (excessively rising), the first actuator 23, in particular with its switching piston 24, a correspondingly higher force on the closing body 25, so that the bypass valve 15 is opened and the bypass valve 15 in this case as an overload valve or Safety valve can act to limit the pressure.

In the delivery mode, the working pressure acting on the pressure piston 41 via the line 44 has displaced the pressure piston 41 in FIG. 2 to the left, ie to the holding piece 39, so that the holding piece 39 is prestressed against the cone 38 with the higher second preload value. However, this biasing force is still less than the closing force acting on the closing body 25 in the conveying operation, so that the bypass valve 15 remains closed.

Further, in the delivery mode, the pressure control valve 19 is closed due to the force of its valve spring 46.

In particular, when the liquid discharge is shut off by closing the valve gun 10, a transfer from the delivery mode to the bypass mode occurs, as shown in FIG.

First, the liquid flow breaks through the check valve so that it closes. The blocking of the liquid delivery or the closing of the valve gun 10 o. The like. Further leads to a pressure pulse (short-term jump in the outlet pressure), so that now the first actuator 23 by means of the already applied to the closing body 25 control piston 24, the bypass valve 15 very quickly and / or at least initially opens, whereby the hitherto prevailing in the bypass valve 15 on the side of the supply line 6 fluid pressure drops very quickly and this leads to an easier further opening of the bypass valve 15.

With the opening movement of the closing body 25, a corresponding axial movement of the counter rod 34 and the cone 38 is accompanied, so that the retaining piece 39 can advance laterally to the counter rod 34 or retract into the cone 38 or the inclined plane formed thereof, to the closing body 25 with the preferably fixed, in particular axially adjustable connected to hold cone 38 in the preferably fully open position, as indicated in Fig. 3.

If necessary, causes the first actuator 23 so only the initial, but preferably complete opening of the bypass valve 15 during the transition to the bypass mode. The second actuator 36 then ensures that the bypass valve 15 during the course of the bypass operation - including during and after the lowering of the outlet pressure from the working pressure to the holding pressure - is kept open.

The pressure control device 17 or its pressure control valve 19 opens and causes said lowering of the outlet pressure. However, this is preferably done - in particular due to the throttle 47 - relatively slow and / or controlled, so that the actuated by the outlet pressure control piston 24 correspondingly slow or controlled by the in Fig. 3 still advanced position returns to its rest position shown in Fig. 4. Thus, a hard contact or striking of the control piston 24 is avoided, especially in the high-acting forces. Fig. 4 shows the valve assembly 1 in the bypass operation.

Next, the only slow pressure drop from the working pressure to the holding pressure that the first actuator 23, the bypass valve 25 initially completely opens.

Even when lowering the pressure from the working pressure to the holding pressure of the pressure piston 41 remains in the holding piece 39 or cone 38 toward advanced position. The force of the opposing spring 42 is therefore preferably lower and can not move the pressure piston 41 back to its rest position. Consequently, in the bypass mode, the holding piece 39 with the lower first bias value remains biased against the cone 38. This biasing force is sufficient to hold the closing body 25 in the bypass operation against the force of the closing spring 33 from the retaining piece 39 in the open position.

Only when the valve gun 10 is opened again does the outlet pressure or holding pressure collapse. This results in that the second actuator 36 and the pressure piston 41 no more biasing force on the Holding piece 39 and accordingly no force on the cone 38 exerts, so that the closing body 25 returns due to the force of the closing spring 33 back to its closed position, the bypass valve 15 thus closes. The valve device 1 then returns to the state of the conveying operation shown in FIG.

The valve arrangement 1 is designed in particular for very high volume flows of, for example, 30 to 60 l / min. This allows a universal use for different purposes or with different pumps 3 or Hochdruckreinigungsvorrichtuugen 2.

At higher flow rates, a larger diameter of the closing body 25 and the associated valve seat 32 and the sealing seat is required, in particular in order to achieve a sufficiently low flow resistance in the bypass operation, in particular at the same opening stroke. However, this then correspondingly increases the area of the closing body 25 acting in the closing direction. This normally requires a substantial enlargement of the oppositely effective area of the piston section 31 or of the first actuating device 23 and / or in particular a significantly greater dimensioning of the main spring 26 and of all the components connected thereto. to be able to withstand the much higher forces.

The present invention now goes another way. By means of working against ambient pressure counter-rod 34 is a compensation.

By increasing the diameter of the counter rod 34, it is namely possible to compensate for an enlarged sealing seat of the bypass valve 15, the area increase, so that the resulting effective in the closing direction surface preferably remains constant or substantially equal. A cross-sectional increase at the sealing seat is thus achieved by a surface corresponding increase in the diameter of the counter rod 34. Accordingly, then a change in the other components, in particular the first actuator 23, no longer required. Consequently, with very little effort and using a plurality of identical parts, a family of valve assemblies 1 for different volume flows and / or working pressures can be created.

The valve arrangement 1 preferably has a sensor, in this case a microswitch 48, for detecting the position of the bypass valve 15, in particular the opening and closing of the bypass valve 15. In the illustrated example, the position of the counter rod 34 is detected. In particular, the counter rod with its free end actuates the associated micro-switch 48th

The valve arrangement 1 preferably has a sensor for detecting the position or position of the control piston 24. Preferably, for this purpose, a microswitch 49 is used, which is actuated, for example via an actuating element 50 from the control piston 24. However, other constructive solutions are possible.

The preferred detection of the position of the bypass valve 15 and / or the control piston 24 allows optimal control or regulation of the high-pressure cleaning device 2, in particular the pump 3 and / or other components.

The valve assembly 1 is particularly preferably designed for working pressures of about 35 to 70 MPa. In bypass operation - ie with closed spray or valve gun - there is a reduction of the pressure in the hose or in the pressure line 9 and in the gun 10, for example, at most 5 MPa.

LIST OF REFERENCE NUMBERS

1

valve assembly

2

High-pressure cleaning device

3

pump

4

liquid

5

tank

6

supply line

7

Inlet

8th

outlet

9

pressure line

10

valve gun

11

jet

12

beam

13

check valve

14

bypass line

15

bypass valve

16

return

17

Pressure control device

18

bypass line

19

Pressure control valve

20

casing

21

valve body

22

feather

23

first actuating device

24

switching piston

25

closing body

26

mainspring

27

handle

28

operating space

29

Bypaßraum

30

control channel

31

piston section

32

valve seat

33

closing spring

34

counter-link

35

housing part

36

second actuating device

37

Translation / redirection

38

cone

39

holding piece

40

biasing spring

41

pressure piston

41a

limiting element

42

against spring

43

control room

44

management

45

plunger

46

valve spring

47

throttle

48

microswitch

49

microswitch

50

actuator

Claims (18)

Valve arrangement (1) which can be supplied with a liquid (4) under high pressure, in particular by a high-pressure cleaning device (2) or pump (3), and optionally in a conveying or bypass mode,
with a supply line (6), the inlet side of the liquid (4) can be fed, wherein the liquid (4) in the delivery mode outlet side with a working pressure, in particular via a connectable pressure line (9) or valve device, such as a valve gun (10), can be dispensed is
with a non-return valve (13) formed in the supply line (6), which is flowed through in the conveying operation of the liquid (4) and closes in bypass mode,
a bypass line (14) which is connected upstream of the check valve to the supply line (6) to return the liquid (4) in the bypass mode, in particular to the high-pressure cleaning device (2), the pump (3) or a liquid reservoir,
with a bypass valve (15) for blocking the bypass line (14) in the conveying operation,
preferably with a first actuating device (23) for in particular complete opening of the bypass valve (15) during the transition from the conveying mode to the bypass mode and / or when a maximum outlet pressure of the supply line (6) in the conveying mode is exceeded
preferably with a second actuating device (36) for keeping open the bypass valve (15) in bypass operation,
preferably with a pressure control device (17) for lowering the outlet pressure to a holding pressure reduced in the bypass mode compared to the working pressure,
characterized,
in that the second actuating device (36) and / or the pressure control device (17) is or are designed as an assembly on the valve arrangement (1) preferably attachable outside and / or in a modular manner. Valve arrangement according to claim 1, characterized in that the second actuating device (36) and / or the pressure control device (17) is or are provided with its own, possibly combined housing. Valve arrangement (1) which can be supplied with a liquid (4) under high pressure, in particular by a high-pressure cleaning device (2) or pump (3), and optionally in a conveying or bypass operation, in particular according to one of the preceding claims,
with a supply line (6), the inlet side of the liquid (4) can be fed, wherein the liquid (4) in the delivery mode outlet side with a working pressure, in particular via a connectable pressure line (9) or valve device, such as a valve gun (10), can be dispensed is
with a non-return valve (13) formed in the supply line (6), which is flowed through in the conveying operation of the liquid (4) and closes in bypass mode,
a bypass line (14) which is connected upstream of the check valve to the supply line (6) to return the liquid (4) in the bypass mode, in particular to the high-pressure cleaning device (2), the pump (3) or a liquid reservoir,
with a bypass valve (15), in particular with a closing body (25) for blocking the bypass line (14) in the conveying mode,
preferably with a first actuating device (23) for in particular complete opening of the bypass valve (15) during the transition from the conveying mode to the bypass mode and / or when a maximum outlet pressure of the supply line (6) in the conveying mode is exceeded
with a second actuating device (36) for keeping open the bypass valve (15) in bypass operation,
preferably with a pressure control device (17) for lowering the outlet pressure to a holding pressure reduced in the bypass mode compared to the working pressure,
characterized,
in that the second actuating device (36) is decoupled from the movement and / or direction of movement of the bypass valve (15) or closing body (25). Valve arrangement according to Claim 3, characterized in that the second actuating device (36) has an actuating direction extending transversely to the movement and / or direction of movement of the bypass valve (15) or closing body (25). Valve arrangement (1) which can be supplied with a liquid (4) under high pressure, in particular by a high-pressure cleaning device (2) or pump (3), and optionally in a conveying or bypass operation, in particular according to one of the preceding claims,
with a supply line (6), the inlet side of the liquid (4) can be fed, wherein the liquid (4) in the delivery mode outlet side with a working pressure, in particular via a connectable pressure line (9) or valve device, such as a valve gun (10), can be dispensed is
with a non-return valve (13) formed in the supply line (6), which is flowed through in the conveying operation of the liquid (4) and closes in bypass mode,
a bypass line (14) which is connected upstream of the check valve to the supply line (6) to return the liquid (4) in the bypass mode, in particular to the high-pressure cleaning device (2), the pump (3) or a liquid reservoir,
with a bypass valve (15), in particular with a closing body (25) for blocking the bypass line (14) in the conveying mode,
preferably with a first actuating device (23) for in particular complete opening of the bypass valve (15) during the transition from the conveying mode to the bypass mode and / or when a maximum outlet pressure of the supply line (6) in the conveying mode is exceeded
with a second actuating device (36) for keeping open the bypass valve (15) in bypass operation,
preferably with a pressure control device (17) for lowering the outlet pressure to a holding pressure reduced in the bypass mode compared to the working pressure,
characterized,
that the second actuator (36) via a preferably mechanical transmission directly or indirectly on the bypass valve acts (15) or the closing body (25), Valve arrangement according to Claim 5, characterized in that the second actuating device (36) has a deflection and / or a transmission (37), in particular an inclined plane or a cone (38), as a transmission for actuating or blocking the bypass valve (15) or Has closing body (25). Valve arrangement (1) which can be supplied with a liquid (4) under high pressure, in particular by a high-pressure cleaning device (2) or pump (3), and optionally in a conveying or bypass operation, in particular according to one of the preceding claims,
with a supply line (6), the inlet side of the liquid (4) can be fed, wherein the liquid (4) in the delivery mode outlet side with a working pressure, in particular via a connectable pressure line (9) or valve device, such as a valve gun (10), can be dispensed is
with a non-return valve (13) formed in the supply line (6), which is flowed through in the conveying operation of the liquid (4) and closes in bypass mode,
a by-pass line (14) connected upstream of the check valve to the supply line (6) for returning the liquid (4) in by-pass operation, in particular to the high-pressure cleaning device (2), the pump (3) or a liquid reservoir;
with a bypass valve (15), in particular with a closing body (25) for blocking the bypass line (14) in the conveying mode,
preferably with a first actuating device (23) for in particular complete opening of the bypass valve (15) during the transition from the conveying operation in the bypass mode and / or when exceeding a maximum outlet pressure of the supply line (6) in the conveying operation,
with a second actuating device (36) for keeping open the bypass valve (15) in bypass operation,
preferably with a pressure control device (17) for lowering the outlet pressure to a holding pressure reduced in the bypass mode compared to the working pressure,
characterized,
in that the second actuating device (36) is controllable by the outlet pressure, but acts on the bypass valve (15) or the closing body (25) or an associated actuating means with an actuating force decoupled from the outlet pressure. Valve arrangement according to claim 7, characterized in that the actuating force at the holding pressure to a first bias value of a biasing spring (41) and the working pressure to a second bias value of the biasing spring (41) is corresponded. Valve arrangement (1) which can be supplied with a liquid (4) under high pressure, in particular by a high-pressure cleaning device (2) or pump (3), and optionally in a conveying or bypass operation, in particular according to one of the preceding claims,
with a supply line (6), the inlet side of the liquid (4) can be fed, wherein the liquid (4) in the delivery mode outlet side with a working pressure, in particular via a connectable pressure line (9) or valve device, such as a valve gun (10), can be dispensed is
with a non-return valve (13) formed in the supply line (6), which is flowed through in the conveying operation of the liquid (4) and closes in bypass mode,
a bypass line (14) which is connected upstream of the check valve to the supply line (6) to return the liquid (4) in the bypass mode, in particular to the high-pressure cleaning device (2), the pump (3) or a liquid reservoir,
with a bypass valve (15) for blocking the bypass line (14) in the conveying operation,
preferably with a first actuating device (23) for in particular completely opening the bypass valve (15) during the transition from the conveying mode to the bypass mode and / or when a maximum outlet pressure of the supply line (6) in the conveying mode is exceeded;
with a pressure control device (17) for lowering the discharge pressure to a reduced holding pressure in the bypass operation in relation to the working pressure,
characterized,
in that the pressure control device (17) is provided with a throttle (47) and / or designed such that the outlet pressure is lowered to the holding pressure at a maximum speed or controlled or throttled. Valve arrangement according to claim 9, characterized in that the valve arrangement (1) is designed such that the first actuating device (23), preferably the switching piston (24), is moved back into its rest position as a function of the pressure reduction to the holding pressure or controlled. Valve arrangement according to Claim 9 or 10, characterized in that the valve arrangement (1) has a second actuating device (36) for keeping open the bypass valve (15) in the bypass operation, in particular at and / or by the holding pressure. Valve arrangement according to one of the preceding claims, characterized in that the bypass valve (15) or its closing body (25) is biased or pressed into the closed position by a closing spring (33) and / or by the fluid pressure in the supply line (6) upstream of the blocking valve becomes. Valve arrangement according to one of the preceding claims, characterized in that the first actuating device (23) is actuatable against spring force in the opening direction and / or has a switching piston (24) which is in fluid communication with the supply line (6) in such a way that it is moved or biased against the closing body (25) in the opening direction by the working pressure from a rest position withdrawn from the closing body (25) of the bypass valve (15). Valve arrangement according to claim 13, characterized in that the switching piston (24) is biased by a main spring (26) in the rest position, so that the switching piston (24) is moved back to its rest position on lowering of the outlet pressure to the holding pressure. Valve arrangement (1) which can be supplied with a liquid (4) under high pressure, in particular by a high-pressure cleaning device (2) or pump (3), and optionally in a conveying or bypass operation, in particular according to one of the preceding claims,
with a supply line (6), the inlet side of the liquid (4) can be fed, wherein the liquid (4) in the delivery mode outlet side with a working pressure, in particular via a connectable pressure line (9) or valve device, such as a valve gun (10), can be dispensed is
with a non-return valve (13) formed in the supply line (6), which is flowed through in the conveying operation of the liquid (4) and closes in bypass mode,
a bypass line (14) which is connected upstream of the check valve to the supply line (6) to return the liquid (4) in the bypass mode, in particular to the high-pressure cleaning device (2), the pump (3) or a liquid reservoir,
with a bypass valve (15) in particular with a closing body (25) for blocking the bypass line (14) in the conveying operation, wherein the bypass valve (15) or its closing body (25) is biased or pressed by the fluid pressure into the closed position,
with an actuating device (23, 36) for preferably completely opening the bypass valve (15) in the bypass mode and / or when a maximum, outlet pressure of the supply line (6) in the conveying mode is exceeded,
characterized,
in that the valve arrangement (1) has a counter rod (34) coupled to the closing body (25) which is sealed off from the under-pressure bypass valve (15) for at least partial compensation of the closing force acting on the closing body (25) by the fluid pressure an outdoor area under ambient pressure. High-pressure cleaning device (2) with a valve arrangement (1) according to one of the preceding claims. High-pressure cleaning device according to claim 16, characterized in that a pressure line (9), in particular a hose, with a valve gun (10) to the valve assembly (1), in particular its outlet (8) is connected. Use of a sealed from a liquid pressure valve (15) for at least partial compensation of the liquid pressure on a closing body (25) of the valve (15) acting closing force out into a standing under ambient pressure outside area extending counter rod (34), so that at a specific closing force acts on the closing body (25), in particular in a valve arrangement (1) according to one of claims 1 to 15, wherein the diameter of a valve seat (32) depends on a desired volume flow through the valve (15) Valve (15) and / or the diameter of the closing body (25) is varied and wherein the diameter of the counter rod (34) is varied to adjust the compensation, so that the closing force at the particular liquid pressure or the resulting, effective in the closing direction surface at least in remains essentially the same.

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