Fittings for valves and / or measuring couplings used in fluid systems to detect fluid pressure and to fill, empty and vent fluid systems

Abstract

A connection fitting (102) for a valve and / or measuring coupling (2) for detecting the working pressure of a fluid medium in a fluid system, the valve and / or measuring coupling (2) comprising a connection sleeve (6) which is under operating pressure in the installed state, with a connection piece (16), and with a hole (10) in which a spring-loaded and mechanically actuable non-return valve (32) is arranged, the valve body (18) of the non-actuated state being supported on a valve seat (52), wherein the connection fitting (102) has an opening pin (114), wherein the opening pin (114) has a contact surface for the valve (32), in particular a circular, closed contact surface, and at least one channel (118) extending laterally relative to the contact surface, through which a connection between the connection fitting (102) and the valve and / or measuring coupling (2) can be established.

Description

Technical Field

[0001] The invention relates to a connection fitting for a valve and / or measuring coupling for a fluid system for detecting the operating pressure of a fluid medium, the valve and / or measuring coupling comprising a coupling sleeve which is under operating pressure in the installed state, with a connection piece, and with a bore in which a spring-loaded and mechanically actuable non-return valve is arranged, the valve body of which is supported on a valve seat in the non-actuated state. The invention also relates to a fluid connection. Background Art

[0002] Valve and / or measuring couplings of the type described above, which can also be referred to as mechanically unlockable non-return valves, are known and are used, for example, for the production of test or measuring connections on pressure pipes, wherein a coupling sleeve is usually fixedly mounted on the fluid system by means of its screw-in thread. During the test or measuring operation, an opening pin designed as a hollow pin is screwed onto the coupling sleeve by means of a lock nut, and the opening pin can be connected to a pressure sensor by means of a hose or directly.

[0003] The coupling can be connected to the connection fitting under pressure, i.e. without shutting down the system. Thus, the effective operating pressure can be measured directly in the fluid system using such a valve and measuring coupling, without having to relieve the pressure and without having to loosen the vent screw or pipe threaded connection. Such couplings are used in various components and control systems in fluid systems.

[0004] After the coupling connection is separated, a protective cap is usually screwed onto the connecting sleeve with an external thread, the purpose of which is to prevent dirt from entering the connecting sleeve and, in the event that the non-return valve installed in the connecting sleeve is not closed in an absolutely tight manner, the protective cap also assumes an additional sealing function. This sealing function is achieved by a closed pin in the protective cap, which sinks into the secondary seal of the connecting sleeve in the screwed-on state.

[0005] DE 41 32 690 A1 discloses a valve and measuring coupling for fluid systems with high operating pressures, high-frequency pressure oscillations and mechanical vibrations for measuring pressure and pressure and temperature combinations. It comprises a coupling sleeve, in the bore of which a spring-loaded non-return valve with a sealing system is arranged.

[0006] A disadvantage when connecting known valve and measuring couplings to corresponding connection fittings is that they are usually designed for operating pressures of up to 630 bar. In these couplings, however, special devices require operating pressures of up to about 1000 bar. In this case, an explosion-proof pressure of at least 4000 bar and a resistance to 1,000,000 pressure pulses are required at 1330 bar. Furthermore, manual coupling under pressure load should also be possible at at least 700 bar. Summary of the invention

[0007] The object of the present invention is therefore to improve a connection fitting for a valve and / or measuring coupling in such a way that it allows a connection process reliably and without damage at higher operating pressures. In addition, a corresponding fluid connection is provided.

[0008] According to the invention, the task is solved with respect to the fitting in that the opening pin (or cotter pin) has a, in particular circular, closed contact surface for the valve, wherein the opening pin has at least one channel extending laterally relative to the contact surface, through which a connection between the fitting and the valve and measuring coupling can be established.

[0009] Advantageous embodiments of the invention are the subject matter of the dependent claims.

[0010] The invention is based on the consideration that known connection fittings for measuring couplings cannot be connected without loss under the above-mentioned high pressures. This is caused in particular by the drilling or perforation design of the opening pins of the connection fittings, which deform under the high pressure during connection and no longer allow a reliable connection.

[0011] As has already been recognized, the above requirements can be met in that the opening pin has a closed contact surface for the valve, wherein the contact surface is not interrupted by a hole. By opening the non-through hole in the nipple, the pressure load acts from the valve onto the closed surface, which can absorb higher forces without deformation compared to perforated and slotted opening pins (as was the case in previous measuring couplings). This enables lossless connection at very high pressures. Instead, the fluid connection between the fitting and the coupling is realized via at least one channel arranged laterally with respect to the contact surface.

[0012] The connecting fitting can be connected to the connecting sleeve of a valve and / or measuring coupling, wherein the spring-loaded valve body of the non-return valve arranged in the hole of the connecting sleeve is axially moved into the open position of the valve by its opening pin against the spring pressure when the connecting fitting is tightened in the application, and the plug nipple is sealed relative to a secondary sealing system supported in the multi-piece sealing sleeve.

[0013] Advantageously, between two and four, in particular two, channels or openings are provided.

[0014] The passage extends conically outwards in the fitting from the contact surface in the direction of the valve body. The passage is preferably designed to be straight or channel-shaped.

[0015] Advantageously, the connection fitting has a supporting flange for supporting a supporting sleeve of the valve and / or measuring coupling.

[0016] In a preferred embodiment, the connection fitting comprises an internal buttress thread for receiving an external buttress thread of a connection piece of a valve and / or measuring coupling, thereby reducing thread friction and thus the torque required for coupling under pressure compared to conventional threads.

[0017] The above-mentioned object is achieved in terms of a fluid connection by a fluid connection, which includes the above-mentioned connection fitting and a valve and / or measuring connector for a fluid system to detect the working pressure of a fluid medium, the valve and / or measuring connector including a connection sleeve which is under operating pressure in the installed state, with a connection piece, and with a hole in which a spring-loaded and mechanically actuatable check valve is arranged, the valve body of the check valve being supported on a valve seat in the non-actuated state and being contactable via a contact surface of an opening pin, wherein the connection fitting is designed to be screwed onto the connection piece of the valve and / or measuring connector.

[0018] The valve seat is advantageously integrally constructed in the coupling sleeve or fixed in the coupling sleeve by a joining method. In the known coupling sleeve, the valve is held by means of an insert which is screwed or inserted into the housing and then crimped. The screw-in thread or crimping is usually not able to withstand the high pressure. This means that in a bursting pressure test, the coupling fails before a pressure of 4000 bar is reached. According to the invention, since the valve or valve body is directly supported in the housing, i.e. inserted into the housing from the back of the coupling, threads or crimpings which must withstand pressure are eliminated. The expression "the valve seat is integrally constructed in the housing" preferably indicates a valve seat which is formed by the inner face or inner surface of the housing.

[0019] Advantageously, the valve seat has an inner contour with a first section extending parallel to the axial direction of the bore and a second section tapering in the direction of the coupling sleeve, wherein the outer contour of the valve body is designed to conform to the shape of the two sections, so that the required parameters with regard to bursting pressure, durability and the like can be reliably maintained by the direct support of the valve body on the coupling sleeve. Due to the direct support of the valve in the housing, significant production advantages are obtained compared to known valve and measuring couplings in that mechanical deformations, the quality of the crimping or the screw connection no longer have to be controlled during production, so that even in the case of manufacturing tolerances, the stability of the valve is always achieved.

[0020] The valve and / or measuring coupling advantageously comprises a sealing ring which is arranged in a groove of the valve body, wherein the groove has a trapezoidal cross section which tapers in the radial direction. The resulting accommodation or cavity of the sealing ring or O-ring by means of the trapezoidal groove prevents the O-ring from being pulled out when the valve is open and at high flow rates and thus blocks the flow cross section.

[0021] Preferably, the sealing ring does not engage completely in the portion of the bore that is a section of the valve seat when the valve is closed, so that a larger flow cross section is released with a short valve stroke.

[0022] In a preferred embodiment, the valve body is constructed in two parts, with a receiving part and an inserting part, wherein the receiving part has a blind hole, which receives a pin of the inserting part, wherein a trapezoidal groove for a sealing ring is formed between a flange of the inserting part and a flange of the receiving part. When manufacturing the measuring coupling, the sealing ring can be placed on the flange of the receiving part, and then the pin of the inserting part is inserted into the blind hole of the receiving part, so that the sealing ring is arranged in the trapezoidal groove.

[0023] Preferably, the coupling sleeve has an external thread which is configured as an outer sawtooth gear. By configuring the thread with a sawtooth profile in a corresponding orientation, thread friction and thus the torque required for coupling under pressure are reduced.

[0024] The design of the described valve and / or measuring coupling requires independent creative effort. The invention also relates to a valve and / or measuring coupling for a fluid system for detecting the operating pressure of a fluid medium, comprising a coupling sleeve which is under operating pressure in the installed state, with a connection piece, and with a bore in which a spring-loaded and mechanically actuable non-return valve is arranged, the valve body of which is supported on a valve seat in the non-actuated state. The features described in the claims and the description are advantageous designs of the valve and / or measuring coupling.

[0025] The advantages of the invention are in particular that the closed contact surface of the opening pin and the laterally arranged channel allow a non-destructive connection under high pressure, thereby increasing the reliability of the connection and the service life of the connecting fitting and the valve and / or measuring coupling on the connection.

[0026] The connection fitting for the coupling therefore differs from known solutions in that the opening pin is not drilled or perforated. This leads to the problem that the valve in the valve and measuring coupling must be pressed on with a circular cross section. However, the area of ​​the circular cross section is so small that the valve body will deform plastically during the connection under high pressure and thus the connection fitting will be damaged. Therefore, the opening pin is preferably not drilled through and it is pressed onto the valve with a closed face, so that the surface pressure on the opening pin is small.

[0027] By forming the valve seat directly inside the coupling sleeve, the valve and measuring coupling can be operated at pressures of 1000 bar or more. The design of the valve seat directly in the coupling sleeve has the advantage that mechanical deformations, the quality of the crimping or the screw connection do not have to be controlled during production, so that the stability of the valve is always ensured even in the case of manufacturing tolerances.

[0028] The formation of a serration profile on the outer thread of the coupling sleeve reduces thread friction in one direction. In this way, a significant reduction in the opening torque is achieved compared to a comparable standard thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Further objects, advantages, features and application possibilities of the present invention are apparent from the following description of exemplary embodiments with the aid of the accompanying drawings. All described and / or illustrated features alone or in any meaningful combination constitute the subject matter of the present invention, regardless of their summary in the claims or references.

[0030] In the attached figure:

[0031] Figure 1 : A cross-sectional view shows a valve and measuring coupling in a preferred embodiment;

[0032] Figure 2 : Show Figure 1 A partial view of the valve and measuring coupling in FIG.

[0033] Figure 3 : Show Figure 1 Connecting pieces with buttress threads for valves and measuring couplings;

[0034] Figure 4 : Shows the connection fitting and the valve and measuring coupling in the connected open state;

[0035] Figure 5: Show Figure 4 The fittings and valves in the - and measuring couplings are in the process of being disconnected and the valves have just been closed; and

[0036] Figure 6 : Show Figure 4 Fittings and valves in the - and measuring couplings, which are in the process of being disconnected. DETAILED DESCRIPTION

[0037] In all the figures, identical parts are provided with identical reference numerals.

[0038] Figure 1 The valve and measuring coupling 2 for pressure measurement, filling, emptying and exhausting of liquid media shown in FIG. 1 has a coupling sleeve 6 with a hole 10 extending in the axial direction 8, in which a spring 14 is arranged. The valve and measuring coupling 2 has a connecting piece 16, by means of which the valve and measuring coupling can be connected to a corresponding connecting fitting 102 (see Figure 4 ) connection. A support sleeve 20 is provided in the coupling sleeve 6, and the support sleeve and the coupling sleeve 6 form a sealing ring groove for a support ring 24 and a secondary sealing ring 12. The support ring 24 prevents the secondary sealing ring from being squeezed in the gap under high pressure in the coupled state.

[0039] The valve body 18 is implemented in two parts with a receiving part 22 and an insertion part 26 that can be partially inserted into the receiving part. The receiving part 22 extends into the spring 14 in the axial direction and has a flange 30, which is supported on the spring 14. The insertion part 26 includes a pin 34, which is introduced into a blind hole 38 of the receiving part 22. In the axial direction, a flange 40 is connected to the pin 34 in the direction of the connecting part 16. The two flanges 30 and 40 form a groove 44 between them, which has a trapezoidal cross-section. A sealing ring 50 or an O-ring is arranged in the groove 44. In the unoperated state, that is, there is no connecting fitting 102 (see Figure 4 ) is screwed onto the connector 16, the valve body 18 is supported on the valve seat 52. The valve body 18, the spring 14 and the valve seat 52 form the check valve 32.

[0040] The measuring coupling 2 has a vibration protection ring 60 which prevents the locking nut 104 (see FIG. 1 ) from being tightened when the fitting 102 is screwed onto the measuring coupling 2. Figure 4 ) due to vibrations. The measuring coupling 2 has an end plug 28 with a hole inserted into the hole 10, which establishes the connection with the fluid system. The sealing ring 64 represents the seal between the coupling sleeve 6 and the end plug 28.

[0041] exist Figure 2 The measuring connector 2 is partially shown in FIG. Figure 1The valve seat 52 has an inner contour 68 with a first section 70 which is parallel to the axial direction of the bore 10 and which faces the connection piece 16 (see Figure 1 ). Here, the section 74 tapers in the radial direction in the direction of the connecting piece 16 and in particular becomes narrower continuously. For a fixed and secure fit of the valve body 18 in the valve seat 52, the valve body 18 (here the insert 26) has an outer contour which is designed to partially correspond to the shape of the two sections 70, 74.

[0042] A groove 44 is formed between the flanges 30, 40 of the two parts 22, 26 of the valve body 18, which groove has a trapezoidal cross section, wherein the long base of the trapezoid is radially further inward than the short base of the trapezoid which is substantially parallel to the long base. A sealing ring 50 is arranged in the groove 44. The trapezoidal cross section of the groove 44 allows the sealing ring 50 to fit securely and stably in the groove 44.

[0043] exist Figure 3 1 shows a connection piece 16 of a valve and / or measuring coupling 2, onto which, for example, a connection fitting 102 with an opening pin 114 is screwed for measuring pressure. The connection piece 16 has an external thread 90 with a sawtooth profile 92. The external thread is interrupted in the axial direction at at least one point by a groove 94, through which the fluid can escape to the outside when disconnecting.

[0044] exist Figure 4 The connector assembly 102 and Figures 1 to 3 100 of a fluid connection of a valve and / or measuring coupling 2 in the coupling. A connection fitting 102 is screwed into the connection piece 16 of the valve and / or measuring coupling 2. The connection fitting 102 has an internal thread 106 corresponding to the external thread 92 of the connection piece for this purpose. In addition, the connection fitting 102 has a supporting flange 110, which supports the supporting sleeve 20 in the screwed-in state. In the connected state, the operating forces act on the secondary seal 12 and thus on the screwed-in supporting sleeve 20. In addition, the connection fitting 102 is pressed onto the supporting sleeve 20 in the connected state and thus bears a part of the pressure.

[0045] The fitting 102 has a channel 116 which opens into the opening pin 114 and establishes a fluid connection to the fluid under high pressure in the valve and / or measuring coupling 2 via a channel 118 arranged at an angle to the side. Through the non-through hole in the opening pin 114, the pressure load from the valve acts on a closing surface which can absorb higher forces without deformation than the drilled or slotted nipples in the previous valve and / or measuring couplings. This enables a lossless connection under very high pressures. Figure 41 shows the fluid connection 100 in a pressure state in which the valve is open.

[0046] Figure 5 The fluid connection 100 is shown with a closed valve 32. The valve 32 has just been closed and the opening pin 114 is still sealed by the secondary seal 12. Figure 6 A further disconnection is shown in Figure 6 In the embodiment, the opening pin 114 emerges from the secondary seal 12. The fluid under pressure in the joint fitting 102 can pass through the gap between the support sleeve 20 and the opening pin 114 and through the groove 94 in the connecting thread (see Figure 3 ) escapes outward. In the state shown, the external thread 90 of the connector 16 still cooperates with the corresponding internal thread 106 of the connector fitting 102.

[0047] Since the internal thread 106 of the fitting 102 is always engaged when the opening pin emerges from the secondary seal 12, the escaping fluid signals to the user that his fitting 102 is still under pressure. If this were not the case, the pressure would be released in a sudden manner when the last thread pitch is released, especially in the case of gaseous fluids, and the fitting 102 could injure the user.

[0048] Reference numerals list

[0049] 2 Measuring connector

[0050] 6 Connecting sleeve

[0051] 8 Axial direction

[0052] 10 holes

[0053] 12 Secondary seal

[0054] 14 Spring

[0055] 16 Connectors

[0056] 18 Valve body

[0057] 20 Support sleeve

[0058] 22 Receiving

[0059] 24 Support ring

[0060] 26 Insert the item

[0061] 28 End plug

[0062] 30 Flange

[0063] 32 Check valve

[0064] 34 Pins

[0065] 38 Blind hole

[0066] 40 Flange

[0067] 42 slots

[0068] 50 Sealing ring

[0069] 52 Valve seat

[0070] 60 Vibration protection ring

[0071] 64 Sealing ring

[0072] 68 Inner contour

[0073] 70 First Segment

[0074] 74 Second Section

[0075] 80 Outer contour

[0076] 90 External thread

[0077] 92 Jagged Profile

[0078] 94 slots

[0079] 100 Fluid Connectors

[0080] 102 Connector accessories

[0081] 104 Lock nut

[0082] 106 Internal thread

[0083] 110 Support flange

[0084] 114 Opening pin

[0085] 116 Channels

[0086] 118 channels.

Claims

1. A fluid connection (100), comprising a connection fitting (102) with an opening pin (114) and a valve coupling and / or a measuring coupling (2) for detecting the working pressure of a fluid medium in a fluid system, the valve coupling and / or the measuring coupling comprising a connection sleeve (6) which is under operating pressure in the installed state, with a connection piece (16), and with a hole (10), in which a spring-loaded and mechanically actuatable non-return valve (32) is arranged, the valve body (18) of the non-return valve being supported on a valve seat (52) in the non-actuated state and being contactable via a contact surface of the opening pin (114), wherein: The connection fitting (102) is designed to be screwed onto a connection piece (16) of the valve coupling and / or the measuring coupling (2), and the opening pin (114) has a closed contact surface for the non-return valve (32) and at least one channel (118) extending laterally relative to the contact surface, through which a connection between the connection fitting (102) and the valve coupling and / or the measuring coupling (2) can be established, Characterized in that the valve coupling and / or measuring coupling (2) comprises a sealing ring (50) which is arranged in a groove (44) of the valve body (18), wherein the groove (44) has a trapezoidal cross section which tapers in the radial direction.

2. The fluid connector (100) according to claim 1, wherein: The valve seat (52) is integrally formed in the connecting sleeve (6) or is fixed in the connecting sleeve (6) by a joining method.

3. The fluid connector (100) according to claim 1 or 2, wherein: The valve seat (52) has an inner contour (68) with a first section (70) extending parallel to the axial direction of the bore (10) and a second section (74) tapering in the direction of the connecting piece (16), wherein the outer contour (80) of the valve body (18) is designed to conform to the shape of the two sections (70, 74) regions.

4. The fluid connector (100) according to claim 3, wherein: When the valve is closed, the sealing ring (50) does not fit completely into the portion of the bore that is a section of the valve seat (52).

5. The fluid connector (100) according to claim 1 or 2, wherein: The valve body (18) is designed in two parts, with a receiving part (22) and an insert part (26), wherein the receiving part (22) has a blind hole (38) which receives a pin (34) of the insert part (26), wherein a trapezoidal groove (44) for a sealing ring is formed between a collar (40) of the insert part (26) and a collar (30) of the receiving part (22).

6. The fluid connector (100) according to claim 1 or 2, wherein: The connector (16) has an external thread (90) which is configured as an outer sawtooth external thread, and the connector fitting (102) includes a sawtooth internal thread (106) for receiving the sawtooth external thread (90) of the connector (16) of the valve coupling and the measuring coupling (2).

7. The fluid connector (100) according to claim 1, wherein: Between two and four channels (118) are provided.

8. The fluid connector (100) according to claim 7, wherein: The channel (118) extends outwards in a conical manner when viewed from the contact surface in the direction of the valve body (18).

9. The fluid connector (100) according to any one of claims 1, 7 or 8, comprising a supporting flange (110) for supporting a supporting sleeve (20) of a valve coupling and / or a measuring coupling (2).

10. The fluid connector (100) according to claim 1, wherein: The contact surface is circular.

11. The fluid connector (100) according to claim 7, wherein: Two channels (118) are provided.

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