WO1995025848A1

WO1995025848A1 - A valve device

Info

Publication number: WO1995025848A1
Application number: PCT/SE1995/000295
Authority: WO
Inventors: Sven Pettersson
Original assignee: Mark & Mekan Ab
Priority date: 1994-03-22
Filing date: 1995-03-22
Publication date: 1995-09-28
Also published as: SE9400949D0; AU2153395A; SE502529C2; SE9400949L

Abstract

A valve arrangement for distributing or spreading a two-component binder system, comprising a distribution pipe (1) which is intended to be carried by a vehicle and which extends transversely to the movement direction of said vehicle, wherein a first binder component is intended to be conducted through a first conduit or line (101) which includes the pipe (1), wherein a plurality of first valves (60) are connected to the pipe (1) at mutually spaced positions along the length of said pipe and function to deliver the first binder component to distribution nozzles (14) connected to a respective first valve (60), wherein a second conduit or line (313, 26; 313, 35, 36) with an associated second valve (120) for the second binder component connects to each first nozzle (14), and wherein each first valve (60) includes a valve member (6) which is carried by a valve spindle (4) that can be moved to and from a position in which the valve member blocks the first component flow via a valve seat (19, 7) which connects with the nozzle (14). The first valve (60) associated with a nozzle (14) is adapted to control the second valve (120) associated with said nozzle (14).

Description

A VALVE DEVICE.

The present invention relates* to a valve arrangement of the kind defined in the preamble Of the following Claim 1.

As will be apparent, the inventive valve arrangement is intended for dispersing a binder system, for instance a bitumen-type liquid binder system. There is normally used in this regard a truck which carries a binder-containing tank and one or more distributing pipes to which binder is delivered and which extend transversely to the longitudinal direction of the vehicle. Each binder distributing pipe has connected thereto a plurality of mutually spaced nozzles which can be opened and closed with the aid of associated valves, such as to enable the binder to be distributed evenly over an area of desired width along the path travelled by the vehicle.

The control system functioning to open and close the valves is normally designed so that each valve unit can be adjusted between a manoeuverable position and a closed position, or state, and so that the maneuverable valves can be opened or closed simultaneously.

For instance, each valve unit has an operating cylinder which can be controlled remotely with the aid of a pressure medium taken from a pressure medium source. A shut-off valve can then be coupled in the pressure medium line to each individu¬ al valve unit, to enable a valve unit to be selectively deactivated while remaining valve units are activated and manoeuverable. This enables the binder system to be spread over an area of desired width. The distribution pipes may also be movable in their longitudinal directions, so as to establish a binder path of desired width and desired position in relation to the vehicle.

In order to obtain an effective road surface covering, it is important that the binder is distributed or spread very effectively and will quickly bind the stone surfacing material subsequently applied to the binder, so as to enable the road surface to be swept clean of loose stone material as soon as possible, and so that, in road constructions, the risk of weather changes which can influence curing, or hardening, of the binder and its binding ability becomes less important.

In this regard, it has been proposed in recent years to supply a bituminous binder with a foaming agent as the binder is distributed, causing the binder to foam and therewith improving wetting of the stone material, while also reducing the time taken for the binder to bind to the stone surfacing material. The foaming agent may consist in water which is introduced to a bituminous binder to be distributed by the system and which has a temperature well above the boiling point of water.

Alternatively, the bituminous binder can be formed into an emulsion and an emulsion breakdown agent may be incorporated in the emulsion in conjunction with spreading or dispersing the emulsion.

It is naturally suitable, and indeed necessary, in both of these instances (see for instance EP-A 127,933 and GB-A 2,167,975) to ensure that both components of the binder system are effectively mixed in conjunction with delivering the binder to the road subsurface, partly to be able to utilize the components effectively, and partly to prevent unmixed components from escaping and contaminating the environment.

EP-A 127,933 discloses a valve arrangement of the kind defined in the preamble of Claim 1.

This known arrangement includes a large number of outlet nozzles mounted on and disposed along the distributor pipe, and each of the nozzles has a pre-coupled mixing chamber. Each such mixing chamber is supplied with the main binder component (bitumen) through a first outlet^"valve, and with a second binder component (foaming agent) through a second outlet valve. The two valves are designed to be driven synchronously through the medium of a superordinate control means.

One problem with an arrangement of this kind, however, is that the valve arrangement includes a large number of valve units which it must be possible to switch between a non- activated state and an activated state, so as to enable the road coating composition to be spread over a desired area and width, as above indicated. Furthermore, a large number of lines are required to each valve unit from the sources of binder component and from the control means. Consequently, there is a serious danger of a valve arrangement of this kind malf nctioning.

Accordingly, it is an object of the present invention to provide a valve arrangement which will enable a reduction in the number of lines required, particularly in the number of control lines, thereby improving reliability in operation, and also enabling the control of the valve units to be simplified with respect to the common manoeuvering of the valve units to an open/closed state, and also with respect to setting the valve units temporarily to a closed or non- manoeuverable state.

This object is achieved with the valve arrangement defined in Claim 1.

Further developments and embodiments of the valve arrangement are set forth in the dependent Claims.

Thus, according to one important feature of the inventive arrangement, one of the valves that supplies each distribu¬ tion nozzle, or spreader nozzle, with one binder component is adapted to control the other valve that supplies the same nozzle with the other binder component. Thus, άt is only necessary to provide an overall or main control for one of the two valves that supply a nozzle in order to control the two flows of component to the nozzle. Furthermore, only one single operation is required to switch a nozzle arrangement to and from its manoeuverable state, namely an operation which connects and disconnects the operating cylinder of said one valve to and from a common manoeuvering power source. Although the valve unit manoeuvering means is said to be of a pneumatic or hydraulic nature in the following description, it will be understood that the manoeuvering means may have any other equivalent design, for instance may include solenoid valves.

According to one particularly preferred embodiment of the invention in which the primary binder component is delivered via the distribution pipe to respective mixing nozzles via the first valve, the secondary binder component is delivered to the mixing nozzle through a channel which extends through and along the valve spindle of the first valve. In this regard, it is suitable for the two valves to work synchro- nously, so that both component flows to the nozzle mixing chamber will commence and terminate simultaneously.

The preferred embodiment of the inventive valve unit arrange¬ ment enables the valve units to be fitted in a simple manner instead of and in place of the simple valves that have earlier been used on a binder distributing pipe in a conven¬ tional binder dispersing vehicle, wherewith the simple valves have earlier served only to open and close the flow of bitumen from the distribution pipe to respective nozzles.

The inventive design of the valve units also enables the distribution pipe valves used on older vehicles equipped for distributing or spreading binder over a road subsurface to be replaced with the inventive valve units and to couple these units to operating devices and binder component sources.

It will be understood that the inventive valve units can be operated with one single built-in pressure medium cylinder which acts on both valves in the unit. Consequently, one or more valve units can be readily disengaged temporarily with the aid of one single valve in the line connection to the working cylinder of the unit, and that all of the remaining valve units can be operated simultaneously from one pressure medium source.

According to one alternative embodiment of the invention, the other binder component can be conducted to the mixing nozzle through an external line, instead of arranging the flow path of the other binder component through and along the valve spindle.

The invention will now be described in more detail with reference to exemplifying embodiments thereof and also with reference to the accompanying drawings, in which

Fig. 1 is a schematic axial view of a valve unit intended for a valve arrangement according to the invention;

Fig. 2 is an axial section view of another valve unit intended for an inventive valve arrangement;

Fig. 3 illustrates schematically a distribution ramp which includes two mutually parallel distribution pipes each of which carries a plurality of valve units and each of which can be moved longitudinally to estab- lish a binder distribution path of desired width and disposed transversely in relation to the vehicle; and Fig. 4 illustrates schematically an operating circuit for a valve unit included in the inventive valve arrange¬ ment.

Referring first to Fig. 3, it is assumed that the line CL indicates the longitudinal axis line of a vehicle equipped for distributing a bituminous binder system over a road surface. The binder distributing arrangement includes two mutually parallel distribution pipes 1 which extend trans- versely to the line CL and which are movable in their axial directions. Valve units 2 may be arranged in the area between the line CL and the outer end 1A of the pipe 1, such that these units will be in a manoeuverable state. The valve units 2 located in the area between the line CL and the end IB of the pipe are suitably adjusted to a closed, non-manoeuverable state. The valves of the valve units 2 for adjustment between a non-manoeuverable and a manoeuverable state may therewith be adapted to be brought to a closed state in the area between the line CL and the pipe end IB by means of a guide rail 107 for respective pipes 1.

Fig. 4 is a schematic illustration which is intended to show the primary binder component, i.e. bitumen, stored in a tank 103 and circulated by means of a pump 102 through a conduit system 101 which includes a distribution pipe 1 provided with a plurality of essentially mutually spaced valve units 2, of which one is shown in Fig. 4. The valve unit 2 includes a nozzle 14 which is supplied through the conduit system 1 via a valve 60 that can be manoeuvered by means of an operating cylinder 50, which is controlled by supplying pressure medium thereto through a port 9. The cylinder 50 also controls a valve 120 which regulates the supply of a second binder component to a mixing chamber in the nozzle 14. The second binder component delivered to the valve 20 is taken from a tank 310 and delivered to a port 22 through a further conduit system 312 having a branch line 313, by means of a pump 311. The cylinder 50 is supplied through a pressure medium delivery line 210 which includes an operating valve 211 and which is branched from a line 212 connected to a pressure source 213. The valve units 2 can thus be operated in common by activating the pressure source 213, provided that the valve 211 leading to respective units 2 is open.

Fig. 1 is a sectional view of a distribution pipe/distribution ramp 1 in which a valve unit 2 is fitted. The valve unit is controlled by a pneumatic or hydraulic piston-cylinder device. The cylinder part 3 of said device is screwed into the ramp wall 1 and the piston rod of said device, hereinafter referred to as the valve spindle 4, is extended and projects out from the cylinder and into the ramp 1.

That end of the valve spindle 4 located within the cylinder 3 carries a piston 5, while the other end of the valve spindle carries a valve member or valve body 6 and extends from the cylinder-part 3 diametrically into the ramp 1 to the opposite wall-end of said ramp, into which there is screwed a valve sleeve 7 which corresponds to the valve member 6 and which is provided with a seal 19, such as to form a first valve 60 which is either opened for or closed to the passage of binder therethrough, by respectively moving the valve member 6 into and out of abutment with the valve seat sleeve 7 and seal 19.

The end of the valve piston 5 distal from the valve spindle 4 is extended and configured as a valve slide 28 in a cylinder part 12, to form an operating cylinder 50. The valve piston 5 and the valve slide 28 are movable within the cylinder space 8 and the cylinder space 29. The cylinder space 8 communicates with an opening 9 in the cylinder wall, through which pressure medium can be delivered to the cylinder space 8 to move the piston 5 and therewith the valve member 6 of the valve spindle 4 out of abutment with the valve seat sleeve 7 and seal 19. The valve is returned to abutment with the valve seat sleeve 7 and its seal 19 with the aid of a spring 10 which is biassed, or pre-tensioned, to hold the valve closed in the absence of pressure medium. The spring 10 also functions to bias the seal 11, which is intended to prevent binder from exiting from the ramp 1 and entering the cylinder space 8 during valve movement. The seal 11 is comprised of V-rings which are pressed against the valve cylinder 4 and the cylinder housing 3 by wedging action.

The spring 10 is dimensioned to hold the seal 11 biassed even when the seal 11 becomes worn.

In order to prevent pressure medium from penetrating into the ramp 1, the bottom of the cylinder space 8 is sealed with a sealing ring 15, which seals against the valve spindle 4 and the cylinder housing 3. In the event of pressure medium or binder leaking out, for instance because of wear on the seal 15 and/or on the seal 11, this pressure medium or binder is led away through a drainage passage 16 provided in the cylinder housing wall 3.

In the illustrated embodiment, the outer walls of the cylinder housing 3 have a hexagonal shape, to provide better attachment for spanners or wrenches used to screw the housing firmly in the ramp wall. The upper part of the outer wall of the cylinder housing 3 is screw-threaded to provide an attachment for the locking nut 24 which secures the cylinder housing 12. The cylinder housing 12 contains a binder activating agent and has a cylindrical outer wall which passes slightly into the cylinder housing 3 and is therewith supported radially by said housing. The cylinder housing 12 is supported axially by a shoulder 44 located almost at the bottom of the outer wall, the lower edge of which rests on the upper edge of the cylinder housing. The lock nut 24 abuts the upper edge of the shoulder 44 and when the nut 24 is screwed tightly in the cylinder wall 3, the cylinder housing

12 is firmly affixed to the cylinder housing 3. The lock nut 24 includes attachments for a claw spanner so as to enable the nut to be easily tightened, and includes a lock screw or grub screw 25 which prevents the nut from being unscrewed unintentionally. The cylinder housing 12 can be fixed radially irrespective of the angle of the cylinder housing 3, and the cylinder space connection 22 for the binder activating agent can therewith be adjusted to any desired angle in relation to the pressure-medium cylinder space connection 9. The cylinder housing 12 includes a number of channels which extend from the outer part of the bottom edge of the housing 12 to the shoulder 44 and connect with the gap

13 between the lock nut 24 and the hexagonal outer wall of the housing 3. The gaps and the channels function as air- ventilating channels through which air is ventilated from the space 108 above the piston 5 as pressure medium is forced in through the opening 9 and presses up the piston 5.

A second valve 120, which controls the supply of binder activating agent includes a valve slide 28 which is connected to the piston 5, and functions to open and close the binder activating agent supply at the same time as the first valve 60 opens and closes for the distribution of binder. The valve slide 28 includes a circumferential recess 128 which connects with the cylinder space connection 22. Located in the lower part of the cylinder housing 12 is a sealing ring 45 which seals against the valve slide 28 and prevents binder activat¬ ing agent entering the cylinder space 8. When no pressure medium acts on the piston 5 and its associated valve slide 28, the sealing ring 46 seated in the valve slide 28 seals against the cylinder housing 12 and cuts-off the delivery of binder activating agent. Located in the upper part of the cylinder housing 12 is an internal, circumferential groove or recess, and the inwardly facing corner is chamfered or bevelled so as not to damage the sealing ring 46. When pressure medium acts on the piston 5 and lifts the valve slide 28, a connection is opened from the cylinder space connection 22 to the channel or passageway 26 in the valve spindle 4, via the bevelled surfaces 128, 129 in the valve slide 28 and the cylinder housing 12.

A passageway or channel 26 passes internally through the valve slide 28, the valve spindle 4 and the valve member 6. The passageway 26 functions to conduct the binder activating agent from the cylinder space 29 to the binder activating agent nozzle 27. The valve arrangement also includes a check valve having a check valve member 37 and a spring 38 which prevents binder from entering the cylinder space 29, for instance when using a binder that does not require an activating agent or in the event of a fault in the binder activating agent supply system.

The valve spindle 4 is screwed into the piston 5 and the valve slide 28. In order to enable the components to be screwed together easily, the valve member 6 has upper surfaces which are shaped to receive a torque wrench and the upper side of the piston 5 is provided with two countersunk holes for a separate sleeve. The valve member 6 is screwed internally into the channel 26, into which a binder activat¬ ing agent nozzle 27 is screwed. The nozzle 27 functions to introduce binder activating agent in correct and uniform quantities into the binder, meaning that it can be designed in many different ways, which will depend on the viscosity of the binder activating agent and on the pressure at which said agent shall be distributed.

The nozzle 27 can be unscrewed and cleaned easily, or replaced, when the valve is closed, provided that the binder nozzle 14 is removed first. In this case, the nozzle 27 is externally hexagonal and is unscrewed with a box spanner or hexagonal socket wrench which is inserted up through the valve sleeve 7. Alternatively, the nozzle 27 may have an attachment for an Allen key and then a larger diameter, and the valve member attachment may have a larger diameter and the nozzle 27 may be screwed further into the valve member 6.

Because the cylinder housing 3 and the valve seat sleeve 6 are fitted far apart, it is necessary for these components to be accurately fitted in order to obtain an effective valve seal. In order to avoid this problem, the valve member 6 is cupped and the sealing ring 19 is made of a soft and pliable material, and also has the property of preventing binder in the ramp l from adhering thereto. Because the ring 19 is made of a soft and pliable material, it is ensured that a seal will be achieved between the ring and the valve member 6 even should a solid particle be present between the valve member 6 and the ring 19 as the valve is closed. The solid particle will be pressed into the ring without causing a gap to occur. When the valve is subsequently opened, this particle will be flushed out through the nozzle 14, together with the binder. A sealing ring 47 is provided between the valve seat sleeve 7 and the ramp pipe 1.

In order to ensure that the binder and binder activating agent will be effectively mixed together prior to leaving the binder nozzle, it is necessary to provide some type of mixing chamber 39 between the binder nozzle orifice 48 and the location to which the binder activating agent is delivered, which in the illustrated case is beneath the valve member 6. Instead of using a standard binder nozzle which is screwed directly into the valve seat sleeve 7, the illustrated embodiment uses a quick-coupling nozzle 14 and a quick- coupling holder 14 provided with sealing ring 42. A large mixing chamber 39 having a capacity of about 15 ml is obtained with one single nozzle.

Depending on the nature of the binder and the binder activat¬ ing agent, the mixing chamber 39 can have different sizes, forms and may include different means for obtaining effective mechanical working of the binder and binder activating agent and therewith achieving effective mixing of said components. If necessary to achieve an effective mixture, the mixing chamber 39 may be given a capacity of about 30 ml without the problem of subsequent dripping from the chamber when the ramp distributor is switched off. With these types of coatings, the mixing chamber may be still larger without causing problems.

The embodiment illustrated in Fig. 2 has much in common with the embodiment illustrated in Fig. 1, and the main differenc¬ es between these embodiments will now be described, with the remainder of this embodiment earlier having been described with reference to Fig. 1.

Fig. 2 illustrates a valve construction which lacks the provision of a channel 26 in the valve spindle 4. The binder activating agent is instead conducted from the cylinder space 29 in a hose 35 located outside the ramp (said hose being a metal wire braided hose in which couplings are pressed) . The hose 35 leads to the binder activating agent nozzle 14 where binder and binder activating agent are mixed together in the mixing chamber 39. One end of the hose 35 is connected to the cylinder space 29 through the medium of an angle adapter 36 screwed into the cylinder housing 12. The angle adapter can be set to any desired angle. The hose 35 is passed through the shortest possible route externally of the ramp 1 to the adapter 31, which is screwed into the valve seat sleeve 7. A check valve which prevents binder from penetrating up through the hose and into the cylinder space 29 may be fitted between the hose 35 and the adapter 31. The sleeve 7 includes internally a circumferential recess 34 which conducts the binder activating agent to the eight nozzle orifices 32 arranged in mutually spaced relationship in the nozzle 14. The nozzle 14 is made of a brass alloy and is screwed into the sleeve 7 and can be adjusted to desired distribution angles. The seating rings 43 seal between the sleeve 7 and the nozzle 14. The lower sealing ring 43 has a slightly larger diameter than the upper sealing ring 43, and the nozzle 14 has two slightly conical external surfaces which extend completely over both sealing rings, therewith preventing the sealing rings 43 from being damaged when screwing in the nozzle 14.

One purpose of the nozzle 14 is to distribute, through its nozzle orifices 32, correct amounts of binder activating agent uniformly to the binder. The nozzle orifices 32 may therewith vary in number and design in many different ways, which will depend on the viscosity of the binder activating agent and the pressure at which it is to be distributed.

Another purpose of the nozzle 14 is to function as a mixing chamber 39 in which binder activating agent and binder are mixed together before being distributed or dispersed through the nozzle orifice 48. The nozzle is a slot-type nozzle and is intended to distribute or spread-out uniformly the correct amount of binder and binder activating agent mixture, which means that the nozzle orifice and the slot may have different sizes, depending on the viscosity of the binder activating agent mixture and the pressure at which it shall be distrib¬ uted. The nozzle 14 has a hexagonal outer wall below the screw-thread, providing an attachment for a torque wrench, therewith enabling the nozzle to be easily replaced or cleaned with regard to the nozzle orifice 48 and the orifices 32 through which the binder activating agent passes.

When the valve seat sleeve 7 has been screwed firmly to the ramp 1 and the sealing ring 47 seals effectively, the adapter 31 is connected to the most suitable of three connection locations provided in the sleeve 7, and the remaining two connection locations are plugged with threaded plugs 33 provided with a sealing ring. The valve spindle 4 is then screwed into the piston 5 and the piston 5 is seated together with the valve slide 28 which lacks the channel or passageway 26 of the former embodiment.

In order to ensure that an effective seal is obtained, the valve member 6, which is screwed onto the bottom end of the valve spindle 4, has a radial and axial surface. The valve member 6 is held in place on the valve spindle 4 by means of a cotter pin 17 or the like which passes through a hole 18 provided in the bottom end of the valve spindle 4 and extends out on both sides of the spindle into holes provided in the wall of the valve member. The hole 18 has a larger diameter than the cotter pin 17, which enables the valve member 6 to move axially and radially in relation to the valve spindle 4.

In the case of the embodiments shown in Figs. 1 and 2, the cylinder housing 12 has a cylinder space connection 22 for binder activating agent or an additive. It is most preferable to connect all valves with a line with respective branch lines to a main line for the binder activating agent, wherein respective branch lines may be formed by a so-called banjo screw screwed into the cylinder space connection 22. The binder activating agent is pumped to the valves from a tank and the pump may be volume-controlled or pressure-controlled. The binder activating agent distribution pressure will preferably be greater than the binder distribution pressure, which is often from 0.4 to 1 bar. The valve is able to manage a 10% mixture of binder activating agent in the binder, depending on the nature of the two components.

It will be seen from Fig. 4 that the valve 211 is preferably combined with the valve unit 2. The valve 211 is preferably of the kind that has an operating lever which is spring- biassed towards the open position of the valve 211. Referring back to Fig. 3, it will be seen that a guide rail 107 is mounted stationarily along that part (CL-1B) of the path of respective ramp pipes 1 where the valves 211 shall be closed, i.e. on respective sides of the line CL. The rail 107 activates the levers in the part CL-IB of the path and therewith closes the relevant valves 211 and releases the levers so as to open the valves 211 when said valves are moved to the other side of the line CL, as a result of axial displacement of the pipe 1.

Claims

1. A valve arrangement for distributing or spreading a two- component binder system, comprising a distribution pipe (1) which is intended to be carried by a vehicle and which extends transversely to the movement direction of said vehicle, wherein a first binder component is intended to be conducted through a first conduit or line (101) which includes the pipe (1), wherein a plurality of first valves (60) are connected to the pipe (1) at mutually spaced positions along the length of said pipe and function to deliver the first binder component to distribution nozzles (14) connected to a respective first valve (60), wherein a second conduit or line (313, 26; 313, 35, 36) with an associated second valve (120) for the second binder component connects to each first nozzle (14), and wherein each first valve (60) includes a valve member (6) which is carried by a valve spindle (4) that can be moved to and from a position in which the valve member blocks the first component flow via a valve seat (19, 7) which connects with the nozzle (14), characterized in that the first valve (60) associated with a nozzle (14) is adapted to control the second valve (120) associated with said nozzle.

2. A valve arrangement according to Claim 1, characterized in that the valve member (6) of the first valve (60) is carried by an axially movable spindle (4); and in that the second line (26) extends through the valve spindle (4).

3. A valve arrangement according to Claim 2, characterized in that the first valve (60) includes a valve seat bushing (7) which is fitted through the wall of the distribution pipe (1), and a valve body (3) which is mounted on the distribu¬ tion pipe (1) in a position diametrically opposed to the seat bushing (7), wherein the valve body carries the axially movable valve spindle (4) with its valve member, and includes a preferably hydraulically or pneumatically spindle drive means ( 50 ) .

4. A valve arrangement according to Claim 3, characterized in that the spindle (4) is connected to a valve slide? (28) belonging to the second valve (120) for opening and closing the second valve as the first valve opens and closes; and in that the first valve, the second valve and the valve spindle drive means are combined to form a valve unit (2) .

5. A valve arrangement according to any one of Claims 1 to

4, characterized in that the second line or conduit includes a check valve (37, 38), preferably arranged downstream of the second valve (120).

6. A valve arrangement according to any one of Claims 1 to

5, characterized in that the second line or conduit includes a pump for injecting the second binder component into the nozzle (14) at a pressure which is substantially higher than the infeed pressure of the first binder component.

7. A valve arrangement according to any one of Claims 1 to

6, characterized by means for detecting the number of openable first valves, said detecting means being adapted to control a pumping parameter for the first binder component on the basis of the number of openable first valves.

8. A valve arrangement according to any one of Claims 1 to

7 , characterized by means for adjusting the flow rate of the second binder component through the second line or conduit to a value which essentially constitutes a predetermined proportion of the flow rate of the first binder component exiting from a first valve.

9. A valve arrangement according to any one of Claims 1 to 8, characterized by spring means (10) for biassing the valve member (6) into a sealing position against the valve seat (19).

10. A valve arrangement according to Claim 2, characterized in that the section (26) of the second line or conduit extending through the valve spindle (4) opens into a valve member part that is exposed to the nozzle (14) in the closed state of the first valve (60).