DE2909046C2 - Valve arrangement for a pressurized fluid medium - Google Patents

Description

a) it is a closed, cup-shaped threaded stopper (21) from the inside of the cavity (18) into an internal thread (22) of the screw socket (16, 16 ') screwed in;

b) the threaded plug (21) has a cylindrical recess (34) in which the valve body (19, 19 ') is displaceable in a sealed manner;

c) the valve body (19, 19 ') has a central through opening (34, 35);

d) the compression spring (20) is between the valve body (19, 19 ') and the bottom of the threaded plug (21) arranged:

e) there is a passage (33,33 ') from the relative of the valve seat (31) facing the threaded plug (21) side of the through opening (30) of the screw sleeve (16, 16 ') to the end of the cavity facing the passage (7) (18);

f) the valve body (19, 19 ') offers a through an annular radial shoulder of the valve body (19, 19 ') formed when the valve body (19, 19') rests on the valve seat (31) the passage (33, 33 ') accessible to the fluid medium in the container or the like Lifting off from the valve seat (31) represents the effective pressure surface (27).

2. Valve arrangement according to claim 1 with a through opening (30) of the screw sleeve (16) penetrating pin (41), characterized in that the part facing away from the threaded stopper (21) (35) of the passage opening of the valve body (19) has a smaller inside width than the through

passage opening (30) of the screw socket (16).

3. Valve arrangement according to claim 1, characterized in that the pin (43) in the screw socket (16 ') is firmly attached and the valve body (19') is rotatable, as well as one that interacts with the pin (43) in this way Cam surface (45) has that upon rotation of the valve body (19 ') this of the valve seat (31) can be lifted off.

4. Valve arrangement according to claim 3, characterized in that the valve body (19 ') via an in the end (35) of the through hole facing the valve seat (31) (44) is rotatable

5. Valve arrangement according to one of claims 1 to 4, characterized in that the valve body (19,19 ') with its front part, which is reduced in diameter, is sealed into a cylindrical part (32) the through opening of the screw sleeve (16, 16 ') is fitted

6. Valve arrangement according to one of claims I to 5, characterized in that the valve seat (31) and sealing surface (26) through at the transition to the reduced diameter part of the valve body (19, 19 ') arranged conical surfaces are formed.

7. Valve arrangement according to one of claims 1 to 4, characterized in that the internal thread and the external thread of the screw bosses (16, 16 ') are at the same height in the axial direction.

The invention relates to a valve arrangement corresponding to the preamble of claim 1

35 Art.

Such a valve arrangement is known from FR-PS 15 33 447. This valve locks against the Pressure from the central passage of the valve housing and can only by means of the pin, which in the known Execution extends through the through opening of the screw sleeve and against the outside of the The valve arrangement produces a mechanical pressure which causes the valve body to lift off the valve seat can be exercised, opened. The well-known valve consists of a few parts and contains only one Spring, so that the structural effort is low.

For containers for pressurized fluid media, especially gas cylinders, there is often the problem that the ingress of contaminants such as

Outside air, dust, oil, smoke gases and the like must be avoided in any case. When the shut-off valve such a container is accidentally left open, the contents can escape and, if the Pressure has dropped enough that said contaminants from the environment penetrate into the container. This can require costly cleaning work with evacuation.

If a valve according to FR-PS 15 33 447 were used to open and empty a container, the same problem would arise. When emptying, the valve would have to be kept open by means of the pin and could in this way, of course, remain open until the container is completely emptied, so that the aforementioned Ingress of contaminants take place

65 could.

To avoid this, safety valve assemblies have been developed such as those in US Pat 38 09 117 are shown. Such valve arrangements

are provided in the outlet of the shut-off valve as an additional valve and are designed so that they are emptied close automatically when the pressure in the container has fallen below a predeterminable value The container cannot be accidentally completely emptied. However, this is a relatively complicated one Structure of the valve with many functional parts and two compression springs available. When there is a change The springs must be replaced when the required closing pressure is reached. Because the functional parts of the valve are loose are arranged in the valve housing, it requires a complete new assembly and adjustment, which in the generally on the container, d. H. to be carried out on site and under correspondingly difficult conditions are.

The invention is based on the object of providing a valve arrangement according to FR-PS 15 33 447 while maintaining their simple structure to the effect that they take on the safety function of the valve arrangement according to US-PS 38 09 117 can exercise.

According to the invention, this object is achieved by the features recited in the characterizing part of claim 1 solved.

The features a) to d) have the effect that the functional parts located in the valve housing are closed Form unit by unscrewing the screw sleeve from its thread from the valve housing can be removed. The closing pressure can be adjusted by simply turning the threaded plug in the screw socket. The spring is supported on the one hand against the bottom of the threaded plug, on the other hand against the valve body, which is sealed in the recess of the threaded plug like a piston is movable. So that this shift is possible, the valve body has the central through opening on. The passage of the screw sleeve allows the fluid medium to pass from the Area of the sealing seat located inside the screw socket to the central passage when filling the Container or the like, wherein the valve body is lifted from the valve seat by means of the pin. When the container is full, i. H. has a pressure above the closing pressure, and if that The shut-off valve of the container is open, the fluid medium escapes from the container in the same way, namely via the passage to the effective pressure surface and lifts the valve body against the force of the spring from the valve seat so that medium can flow out. When the pressure in the container has dropped that far is that the force exerted on the pressure surface is no longer sufficient to overcome the spring, the valve body remains in contact with the valve seat and no further fluid medium can flow out.

The one when filling the container to open the valve Activating pen can be realized in two ways.

When the pin reaches through the through opening of the screw socket as in FR-PS 15 33 447 the embodiment according to claim 2 is provided, in which it is ensured that the pin with its end face come to rest on the face of the valve body and lift it off the valve seat.

In the alternative embodiment according to claim 3, the pin is firmly attached and in the screw socket a rotary tool is only brought to attack from the outside of the valve body, by means of which the Lifting the valve body from the valve seat can be achieved.

For this purpose, the design according to claim 4 is expediently provided on the valve body.

To improve the sealing effect of the valve body, the embodiment according to claim 5 can be provided be.

The valve seat and the associated sealing surface on the valve body can according to claim 6 as conical surfaces be trained.

To achieve a short overall length, ίο the training according to claim 7 is recommended.

Exemplary embodiments of the invention are shown in the drawing

F i g. 1 is a longitudinal section through a shut-off valve arranged on a container with the inventive Valve assembly;

Fig. 2 shows a longitudinal section through the valve arrangement in their closed position on an enlarged scale;

F i g. 3 shows a cross section along the line III-III in FIG Fig.2;

FIG. 4 shows a longitudinal section corresponding to FIG with the valve assembly open;

F i g. 5 shows a side view, partly in section, a filling device in its interaction with the shut-off valve;

F i g. 6 shows a longitudinal section through the filling device according to FIG. 5;

F i g. 7 is a fig. 2 and 4 corresponding longitudinal section through a modified embodiment of FIG Valve arrangement.

In Fig. 1, a shut-off valve 3 is shown, which is in the threaded connector 2 of a container for a below Pressurized fluid medium, for example a gas cylinder 1, is screwed in. The shut-off valve 3 includes a valve housing 4, which has an inlet bore 5, a main bore 6 and one extending therefrom lateral, centrally in the essentially cylindrical cavity 18 of a lateral threaded connector 9 of the Housing 4 has opening 7 passage. The threaded connector 9 forms the inlet and outlet 8 at Filling or emptying the gas cylinder 1.

The axes of the inlet bore 5 and the cavity 18 intersect and are at right angles to one another arranged. A valve arrangement designated as a whole by 13 is screwed into the cavity 18. When the gas bottle 1 is emptied, the gas follows a path through the inlet bore 5 into the main bore 6 of the valve housing 4 and then through the passage 7 into the cavity 18, where it is on the inner end of the valve assembly 13 and exits after passing the same at the inlet and outlet 8.

When filling the container 1, the gas flows in the opposite direction.

In the main bore 6 there is a thread in the axial direction of the main bore that can be turned via a thread 6 displaceable valve insert 10 which seals with a sealing plate 10 'at the edge of the inlet bore 5 can be brought to the system and this closes or opens. The valve insert 10 is rotated via a Hand lever 11 by means of a device shown in FIG. 1 can be seen 4-sided pivot pin 12.

As shown in FIGS. 2 to 4 can be seen, the valve housing 4 of the shut-off valve 3 also forms the valve housing for the valve assembly 13. This comprises a screw sleeve 16, which at its inner end inner and has external threads. With the external thread, the screw sleeve 16 is in an internal thread 14 of the

Connector 9 or the cavity 18 of the valve housing 4 screwed. The outer part of the cavity 18 is without thread, as well as the end part of the screw sleeve 116 located there, which has an annular groove with a Has an O-ring 15 which seals against the wall of the cavity 18.

The screw socket 16 contains a cylindrical chamber which is delimited on its outwardly directed end face by an annular radial wall 28 of the screw socket 16 which surrounds a conical valve seat 31 hexagonal cross-section, which serves to accommodate a turning tool, by means of which the screw ^{sleeve 16 and thus the a} änze valve unit 13 can be screwed into the cavity 18 and screwed out of it.

Passages 33 are provided in the inner end part of the screw socket 16 carrying the threads those in Figs. 2 and 4 only one, in F i g. 3 two opposite one another are shown and the allow the passage of gas from the inner chamber of the screw socket 16 into the cavity 18.

Into the internal thread of the screw socket 16 is from the side facing away from the through opening 30 cup-shaped threaded plug 21 with an external thread 22 screwed in, which has a cylindrical inner Chamber 21 ', in which a sleeve-like valve body 19 in the manner of a piston via an O-ring 17 is sealed and guided movably in the direction of the cylinder axis. On the valve seat 31 facing At the end of the valve body 19, the latter has a conical sealing surface 26 which is connected to the valve seat 31 cooperates The front end of the valve body 19 has a cylindrical extension 23 with an in an O-ring 25 arranged in a groove 24, which cooperates in a sealing manner with the cylindrical bore 32, even before the sealing surface 26 has come to rest on the valve seat 31

At its end facing the bottom of the threaded plug 21, the valve body 19 has a cylindrical chamber 34 in which a helical compression spring 20 is arranged, which is supported on the one hand against the end face of the chamber 34 and on the other hand against the bottom of the threaded plug 21 and opens into the cylindrical chamber 34 a through hole 35 of the FIG. 2 and 4, the left part of the valve body 19, so that the through hole 35 and the chamber 37 form a continuous through opening of the valve body 19.

As shown in FIG. 2 can be seen particularly clearly, the sealing surface 26 of the valve body 19 changes into an annular shape radial wall 27 about which distance from the inner annular radial wall 28 of the Screw sleeve 16 leaves when the sealing surface 26 rests against the valve seat 31 is also between the Valve body 19, the inner circumference of the screw sleeve 16 and the end of the threaded plug 21 is an annular Interspace 29 formed which for connecting the spacing between the radial walls 27, 28 with the passages 33 and the part of the cavity 8 located on the side of the passage 7 is used The outer diameter of the threaded plug 21 is significantly smaller than to enable this connection the internal diameter of the cavity 18 there.

The valve assembly 13 operates in the manner described below. It is assumed that the container 1 contains gas at a pressure which is greater than a predetermined set pressure of the spring 20. When the shut-off valve 3 is then opened by means of the handle 11, gas flows through the passage 7 into the cavity 18 via the passages 33 in the annular space 29 and acts against the radial wall 27, which thus represents a pressure effective surface, by means of which the valve body 19 is displaced to the right by the gas pressure prevailing in the container 1 against the force of the spring 20 according to FIG Open position shown in Fig.4 is reached. The valve arrangement 13 therefore opens automatically when there is sufficient gas pressure in the container 1 in order to allow gas to escape at the inlet and outlet 8. When the pressure of the gas in the container 1. However, below a certain, through displayed details ⁰ of the spring drops 20 flat against ^<T e ^(T value, he can 20 does not overcome the force of the spring more, causing the spring 20 a displacement of the Valve body 19 to the left, whereby the gas passage through the valve unit 13 is interrupted and a complete emptying of the container 1 and the penetration of impurities into the same are prevented.
As already mentioned, the chamber 34 of the valve body 19 is connected to the inlet and outlet via the bore 35. This not only ensures the mobility of the valve body 19 in the threaded plug 21 but also supports the closing of the valve body 19 because the liquid pressure in the inlet and outlet 8 according to FIGS. 2 and 4 acts against the valve body 19 from the right. This can be of particular advantage if several containers with different gases are used in order to achieve a gas mixture. The pressure of the gas in one of the containers can be lower than the pressure of the mixture in the common line. The valve arrangement 13 then prevents the mixture from passing into the container at the low pressure

The response pressure of the valve arrangement 13 is set by screwing it in more or less deeply of the threaded plug 21 in the screw socket 16. The definition of the response pressure can outside of the valve housing 4 take place. In this way, work on site is made easier. The threaded plug 21 is screwed in during the setting until the spring 20, the valve body 19 with the desired Pressure against the valve seat 31 presses. The achieved setting can be achieved by an adhesive on the thread 22 Be Fixed.

The diameter of the through hole 35 in the valve body 19 is much smaller than the diameter the through opening 30 in the screw sleeve 16, so that the end face of the valve body 19 into the clear opening of the through-opening 30 protrudes. This is for filling the container 1 through the threaded connector 9 of importance.

In the F i g. 5 and 6 a filling device 37 is shown which has a threaded sleeve 39 for screwing on on the threaded connector 9 and a handwheel 38 comprises The threaded sleeve 39 contains a collar 40 which in the from F i g. 6 visible way with the collar 40 'on the one hand against a shoulder inside the sleeve 39, on the other hand via a seal against the end face of the threaded connector 9, the collar sleeve 40 merges into a filling tube 36 at the outer end. Inside the collar 40 is a pin 41 in its longitudinal direction slidably mounted under the action of a

Spring 42, which is stronger than spring 20, as shown in FIG. 6 is pressed to the right.

The in Fig. 6 right cylindrical end of the pin 41 has a smaller diameter than that Through opening 30, but a larger diameter than the through hole 35 of the valve body 19. So when the sleeve 39 is screwed onto the threaded connector 9, the front end of the engages Pin 41 on the face of the valve body 19 and presses it against the force of the spring of the Valve seat 31 away, as shown in Figure 6. In In this state, gas can flow into the container through the filling pipe 36 and the passage 7. When the filling is carried out, the threaded sleeve 39 is removed. The valve body 19 continues to act the spring 20 on the valve seat 31 again and closes the passage. By the providence of the pen 42 on the pin 41, damage to the valve body 19 is avoided.

A second embodiment 13 'of the valve arrangement is shown in FIG. When filling can do this proceed in exactly the same way as in connection with FIGS. 5 and 6 has been described. Additionally however, or instead of this, the valve arrangement 13 'can be adjusted with the aid of a suitable rotary tool, which engages the polygonal socket 44, are actuated to move the valve body 19 'into the open position to move.

According to FIG. 7, the valve assembly 13 'comprises a screw sleeve 16', which with the screw sleeve 16 in the is essentially identical with the exception that the radial wall 28 'has a pin seated in a bore 43 carries. The end wall 27 'of the valve body 19' comprises a cam surface 45 against which the pin 43 with its protruding end when turning the valve body 19 'over the polygonal socket 44 to the plant comes. When the valve body 19 'is rotated so far that the pin 43 against the part perpendicular to the axis the wall 27 'rests, the valve body 19' remains in its open position. To close the valve assembly 13 'the valve body 19' is rotated in the opposite direction, whereupon the coil spring 20 presses it against the valve seat 31 and the valve arrangement 13 'closes

The pin 43 can also have another purpose serve, namely as a stop for the threaded plug 21. In this way, a prediction of the Screw-in depth and a presetting of the desired closing pressure of the valve arrangement 13 'take place.

50

For this purpose 4 sheets of drawings

Claims (1)

Patent claims: 1. Valve arrangement for a pressurized fluid medium with a valve housing (4) with a cavity (18) which at one end has a central passage (7) to a container (1) or the like and at the other end an internal thread (14) includes,
with a screw sleeve (16, 16 ') which can be screwed with an external thread into the internal thread (14) of the cavity (18) and has a central through opening (30) opening into the cavity (18), with an annular valve seat (31) formed on the screw sleeve (16, 16 ') at its end facing the cavity (18) and surrounding the mouth of the through opening (30) there,
with a movable valve body (19, 19 ') arranged in the cavity (18) between the valve seat (31} and the passage (7), which presses against the valve seat (31) while blocking the passage from the ^{: The} passage opening (30) of the screw socket (16, 16 ') can be brought into contact with the passage (7) and can be lifted off the valve seat (31) by releasing the passage, with a compression spring (20), by means of which the valve body (19, 19 ') is normally held in contact with the valve seat (31) and with a pin (41, 43) which can be brought into engagement with the valve body (19, 19 ') in its direction of movement and by means of which the valve body (19, 19') can be lifted off the valve seat (31),
characterized by the following features: