WO2014112891A1

WO2014112891A1 - Protection of a check valve inside of a main valve

Info

Publication number: WO2014112891A1
Application number: PCT/RS2014/000002
Authority: WO
Inventors: Slobodan Milovanović
Original assignee: Slobodan Milovanović
Priority date: 2013-01-18
Filing date: 2014-01-17
Publication date: 2014-07-24
Also published as: RS1319U

Abstract

Protection of a check valve inside of a main valve. The main valve (1) of a gas bottle contains inside its outlet connector (3) a completely screwed check valve (2) which anterior frontal surface relies to bottom (4) of the outlet connector (3). To prevent unscrewing of the check valve (2), a channel (5) has been carved in the outlet connector at the appropriate distance (d) from the bottom (4), into which is inserted a spring ring (6) in such a way that it almost touches the back frontal surface of the check valve (2). The check valve (2) carries in a channel on its back end a rubber sealing ring (9), a side (8) of the channel (5) is made conical because it is made at a sharp angle (a) not bigger than 30° in respect to axis of the outlet connector (3) in order that the ring (9) would not be damaged when it exceeds through the channel (5) during the assembling of the check valve (2) to the outlet connector (3),

Description

PROTECTION OF A CHECK VALVE INSIDE OF A MAIN VALVE

Technical Field of Invention

The invention belongs to the field of mechanical engineering and refers to the combined valves specially adapted for pressure vessels and tanks.

According to the International Patent Classification (Int. CI.) designation is:

F 16 B 21/18, F 16 K 15/18, 1/30 // F 17 C 13/04, 5/06

Technical Problem

The invention solves the problem of unwanted unscrewing of the check valve that had been left completely twisted during mounting by manufacturer inside the outlet connector of the main valve. The invention also solves the problem of unwanted destruction of the reduced thread of check valve with ejection of check valve from the outlet connector of the main valve during its suddenly oppening.

Background Art

Combined valve for the gas bottles that contains inside outlet connector of the main valve completely twisted check valve, is know in the state of technics. Example of such a valve is a valve for oxygen that is manufactured by the factory: GCE s.r.o., 58381 Chotebor, Czechrepublic; valve type 0775921.

The main valve is with its inlet connector, with the conical thread, attached to a gas

bottle/thank and serves that in its open position allows emptying or filling of a bottle/thank.

When the main valve is in its open position, the check valve allows undisturbed emptying of bottle but completely prevents penetration of any impure gas into bottle in the event that on the outlet connector of the main valve is higher pressure than the pressure in the bottle/thank.

Filling of the bottle/thank with gas is possible only with use of a special tool with a needle that is a integral part of the device for the f illing of bottles and that opens the check valve mechanically.

The disadvantage of this design of combined valve is that because the check valve that is completely twisted in the outlet connector of the main valve, is not protected in any way against unwanted unscrewing or ejection from the outlet connector of the main valve in the case of apperance of higher gas pressure force on its anterior frontal surface than the boundary carrying force of its already reduced thread.

In practice, it also happens that the check valve is found partially unscrewed so that it with its anterior frontal surface no longer relies on the bottom of the outlet connector main valve.

Consequence of this situation is decomposition of the check valve or destruction of its reduced thread when a higher pressure force appears on its back frontal surface Based on the above presented, it can be concluded that the check valve needs to be protected against unscrewing in a manner that it would be impossible to find it partially unscrewed inside of the outlet connector in the main valve. Check valve should be with its anterior frontal surface constantly in contact with the bottom of the outlet connector and with its back frontal surface constantly in contact with the fuse against unscrewing, and thus the danger of excessive force on its reduced thread in the event of suddenly oppening of the main valve or valve of the device for filling gas bottles/thanks, would be eliminated.

Disclosure and Summary of the Invention

With in the appropriate place inside of the outlet connector of the main valve, by using this invention, a channel has been carved in which a spring ring has been inserted so that it would relay on the back frontal surface of the complettly twisted check valve.

Especially for this purpose a lateral side of the channel which is closer to the bottom of the outlet connector of the main valve is conical, because it is made at a sharp angle not bigger than 30° in respect to axis of outlet connector, so that during twisting of check valve into the outlet connector, damaging of the sealing rubber ring which check valve carries in its channel on the back end, can not happen.

Since there is no backlash between the relatively thin spring ring and the back frontal surface of the check valve, extracting the ring from the channel is hard to do, so it is a protection from unscrewing of check valve by unlicensed user.

Spring ring as an added element in the construction of the combined valve does not in any way interfere with the basic function of the main and check valve, whether the bottle is emptied or filled, and the channel that has been carved inside of the outlet connector of the main valve does not reduces his bearing capacity.

Since that through the hole of the outlet connector it can be seen if the spring ring is in the channel, this can be used as a quick check whether the check valve is in its place or not.

Based on the technical state, the invention is new because the problem of unwanted unscrewing of the check valve has not been solved.

Brief Description of Drawings

Fig.l -shows reconstructed, combined valve for the gas bottles ( ratio 1:1 )

Fig.2 -shows detail A from the figurel (ratio 5:1 )

Fig.3 -shows view B from the figure 1 (ratio 2:1 ) W

Detailed Description of the Invention

Figure 1 shows within the framework of a partial cross section of the output connector 3 main valve 1 the completely twisted check valve 2 how it is protected against unscrewing.

Fact that the check valve 2 is completely twisted reflects in fact that because with its anterior frontal surface it is relied on the bottom 4 of the outlet connector 3.

According to idea of the invention on figure 1 is shown how right before back frontal surface of the totally twisted check valve 2, at the appropriate distance (d) from the bottom 4 of the outlet connector 3, a channel has been carved 5 in which an spring ring 6 has been inserted that protects the check valve 2 against unscrewing, because there is no backlash between them.

Appropriate distance (d) from the beginning of the channel 5 i.e. from its flat side 7 to the bottom 4 of the outlet connector 3 is calculated as a summation of the length of the check valve 2 and the thickness of the spring ring 6.

How a spring ring 6 is relatively thin and how there is almost no backlash between it and the check valve 2, it would be a big problem to take it out with the pair of usual pliers used in the field, so this solution is a form protection against unscrewing of the check valve 2 by the unlicensed user.

Figure 2 shows magnified profile of the channel 5 into which an elastic spring ring 6 has been inserted. Channel 5 contains a cylindrical bottom that is not especially marked, flat side 7 and conical side 8.

During the twisting of the check valve 2, the sealing rubber ring 9 that check valve 2 carries within its channel on its back end, should exceed over the channel 5 without making any damaging. The edge of the flat side 7 with which sealing rubber ring 9 first contacts does not make any damage to it because it starts to fall into the channel 5, but the next edge could transect it. Hence the next side 8 that is closer to the bottom 4 of the outlet connector 3 is conical because it is made at a sharp angle that is not bigger than 30° in respect to axis of outlet connector 3, so any damage of the sealing rubber ring 9 is not possible. However, if the sharp angle is bigger than 30°, the edge of the conical side 8 over which the sealing rubber ring 9 should exceed would be sharper, so there it would be certainly damaged.

Spring ring 6 is in one direction protected against moving with the flat side 7 and in the other direction it is relied on the back frontal surface of the check valve 2 that is completely twisted, therefore the fact that here the channel side 8 is conical, has no significance.

Figure 3 shows the view through hole of the outlet connector 3 on the back frontal surface of the check valve 2 that is protected against unscrewing.

On the back frontal surface of the check valve 2 there is the slit 10 for the screwdriver that allows twist or unscrewing of check valve 2 to or from the outlet connector 3.

The view through hole of the outlet connector allows a quick check whether the check valve 2 is in its place or not depending on whether the spring ring 6 is in the channel 5 or not. Best Mode for Carryng Out of the Invention

Invention can be used for protection of the check valve against unscrewing or its unwanted ejection from the outlet connector of the main valve of a gas bottle.

Industrial Applicability

Invention is industrially applied in such a way that first the check valve 2 is taken out along with the sealing rubber ring 9 that the check valve 2 carries in its channel on its back end.

Then carve the channel 5 with a profile knife on the appropriate machine for cutting in the outlet connector 3 on the distance (d) from his bottom 4.

Later completely twist the check valve 2 along with sealing rubber ring 9 that it carries in its channel on the back end until it with its anterior frontal surface relies on the bottom 4 of the outlet connector 3.

Finally insert in the channel 5 an spring ring 6 which is significantly easier operation than its taking out, because it is enough with a pair of pliers to constrict it and put shallow in the hole of the outlet connector 3 and then simply push it in the depth until it itself fit into the channel 5.

Signature of applicant

Claims

Patent Claims

1. Protection of the check valve inside of the main valve wherein the check valve (2) is completely twisted inside in the outlet connector (3) main valve (1) so that it's with anterior frontal surface relied on the bottom (4), characterized in that, because at the appropriate distance(d) from the bottom (4) of the outlet connector (3) a channel (5) has been carved in which an spring ring (6) is inserted that relied on the back frontal surface of the completely twisted check valve (2).

2. Protection in relation to claim 1, characterized in that, the side (7) is flat, because it's made at a right angle in respect to axis of the outlet connector (3) and the side (8) is conical, because it's made at a sharp angle (a) not bigger than30° in respect to axis of the outlet connector (3).