High pressure erosion resistant equal percentage throttling characteristic throttle valve

Abstract

The present invention discloses a high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve, which designs a new valve structure and material selection. During assembly, the valve core assembly, the valve seat assembly, and the throttle sleeve assembly are made of stainless steel that are subjected to axial force, and the erosion is made of tungsten carbide WC, which not only saves costs but also takes into account the convenience of replacing WC parts. The throttle stop valve has a very good stop function. When the valve core assembly moves downward to the lower edge of the throttling conical hole of the throttle sleeve, the main flow medium is cut off, and a small amount of medium will flow from the matching gap formed by the WC valve core protection sleeve and the valve core sleeve. Because the matching gap formed by the WC valve core protection sleeve and the valve core sleeve is much smaller than the flow area behind, the medium will take away the impurities and other debris in the sealing pair space. When the valve core assembly moves to the closed position, the soft sealing pair and the hard sealing pair can play a very good sealing effect and can achieve zero leakage.

Description

Technical Field

[0001] The invention relates to the technical field related to throttle valves, and in particular to a high-pressure erosion-resistant throttle valve with equal percentage throttling characteristics. Background Art

[0002] The natural gas coming out of the natural gas wellhead needs to be throttled and depressurized by the Christmas tree and throttle valve before entering the gas gathering station. The natural gas coming out of the well has a high pressure (usually above PN260) and may also contain fine particles of impurities. Such working conditions have a strong impact on the throttle valve. The requirements for the throttle stop valve that can both throttle and cut off are very high. The structural design and material of general valves cannot meet the requirements of such working conditions. Summary of the invention

[0003] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a high-pressure erosion-resistant equal percentage throttling characteristic throttle valve, and at the same time provides a design and manufacturing method for a combined valve core, a combined valve sleeve, and a combined valve seat that are easy to replace. The present invention develops and designs a new valve structure and material selection. During assembly, the valve core assembly, the valve seat assembly, and the throttle valve sleeve assembly are made of stainless steel to be subjected to axial force, and the erosion is tungsten carbide, which saves costs and takes into account the convenience of replacing tungsten carbide parts.

[0004] The present invention is implemented by constructing a high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve, characterized in that: the structure of the throttle valve mainly includes a valve body, a valve seat assembly, a valve core assembly, and a throttle valve sleeve assembly; the seal is a double-quality seal formed by a soft seal pair and a hard seal pair of a surfacing alloy;

[0005] The valve seat assembly comprises an inner hexagon screw A, a WC valve seat protection sleeve, a valve seat and a valve seat overlay sealing surface, wherein the WC valve seat protection sleeve is made of stainless steel and can withstand axial force, the valve seat is subject to erosion, and is made of tungsten carbide, and is not subject to axial force during assembly; the valve core assembly comprises an inner hexagon screw B, an O-ring B, a valve core, a WC valve core protection sleeve, a valve core column, a locking screw A and a triangular sealing ring, wherein the valve core is made of stainless steel and is subject to axial force transmission, the WC valve core protection sleeve is subject to erosion and plays a protective role, the valve core column is made of stainless steel and is subject to axial force transmission, the triangular sealing ring is a soft sealing pair, and a valve core overlay sealing surface made of hard alloy is overlaid on the valve core; the throttle valve sleeve assembly comprises a WC valve core sleeve protection sleeve, a locking screw B and a valve core sleeve, the WC valve core sleeve protection sleeve is made of tungsten carbide, can be subject to erosion and play a protective role as well as a throttling and pressure reducing role, and the valve core sleeve is made of stainless steel.

[0006] According to the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve of the present invention, the medium flow direction of the throttling stop valve is from the side flange to the lower flange, and the medium flow direction is away from the valve cover and the valve core assembly; the WC valve seat protection cover, the WC valve core protection cover and the WC valve core sleeve protection cover are respectively made of tungsten carbide.

[0007] According to the high-pressure erosion-resistant throttle valve with equal percentage throttling characteristics of the present invention; the hexagon socket screw B in the valve core assembly plays a connecting role, and a balancing hole is drilled in the middle of the hexagon socket screw B; the stainless steel valve core and the stainless steel valve core column are connected by the hexagon socket screw B; when the hexagon socket screw B, the valve core, and the valve core column are assembled, the O-ring B and the triangular sealing ring are assembled; the WC valve core protection sleeve and the valve core column are threadedly connected and locked by the locking screw A, so that the triangular sealing ring and the valve core welding sealing surface formed after the valve core and the WC valve core protection sleeve are assembled are hidden under the WC valve core protection sleeve corresponding to the valve core assembly, so that its sealing pair is not affected by the erosion of the medium.

[0008] According to the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve of the present invention, the throttle valve realizes throttling by moving the valve core assembly up and down to change the throttling hole on the WC valve core sleeve protective sleeve of the WC valve core sleeve protective sleeve.

[0009] According to the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve of the present invention, the valve seat surfacing sealing surface is a hard alloy surfacing on the stainless steel valve seat, which is a hard sealing pair, and the hard sealing pair surface is lower than the erosion surface of the WC valve seat protection sleeve made of tungsten carbide, and the WC valve seat protection sleeve and the valve seat are connected by the hexagon socket screw A; when the WC valve seat protection sleeve is subjected to axial force during assembly and closing, the valve seat only plays a protective role and is easy to disassemble and replace.

[0010] According to the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve of the present invention; the WC valve core sleeve protective sleeve is axially designed with several evenly distributed conical throttling holes on the WC valve core sleeve protective sleeve, the area of ​​all throttling holes is designed according to the valve flow, the length of the conical throttling hole is divided into ten equal parts, the equivalent diameter corresponding to the throttling area of ​​each equal part is 0.4-0.8mm larger than the previous diameter, meeting the equal-percentage flow characteristic design; the WC valve core sleeve protective sleeve is threadedly connected to the valve core sleeve and locked by a locking screw B. After assembly, the valve core sleeve throttling hole on the valve core sleeve is assembled and processed according to the throttling hole on the WC valve core sleeve protective sleeve of the WC valve core sleeve protective sleeve, and the WC valve core sleeve protective sleeve withstands throttling erosion.

[0011] According to the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve of the present invention, when the valve core assembly moves downward to the lower edge of the throttling hole on the WC valve core sleeve protective sleeve, the main flow medium is cut off, and a small amount of medium will flow from the fitting gap formed by the WC valve core protective sleeve and the valve core sleeve. Because the fitting gap formed by the WC valve core protective sleeve and the valve core sleeve is smaller than the flow area behind, the medium will carry away the impurities, particles and debris in the sealing sub-space.

[0012] The present invention has the following advantages: the present invention provides a high-pressure erosion-resistant equal percentage throttling characteristic throttle valve, and at the same time provides a design and manufacturing method for a combined valve core, a combined valve sleeve, and a combined valve seat that is easy to replace. The present invention develops and designs a new valve structure and material selection. During assembly, the valve core assembly, the valve seat assembly, and the throttle valve sleeve assembly are made of stainless steel that are subjected to axial force, and the erosion is tungsten carbide, which not only saves costs, but also takes into account the convenience of replacing WC parts. The throttling stop valve has a very good stop function. When the valve core assembly moves downward to the lower edge of the throttling conical hole of the throttle valve sleeve, the main flow medium is cut off, and a small amount of medium will flow from the matching gap formed by the WC valve core protection sleeve and the valve core sleeve. Because the matching gap formed by the WC valve core protection sleeve and the valve core sleeve is much smaller than the flow area behind, the medium will take away the impurities and other debris in the sealing pair space. When the valve core assembly moves to the closed position, the soft sealing pair and the hard sealing pair can play a good sealing effect and can achieve zero leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a general assembly diagram of the throttle valve of the present invention;

[0014] Figure 2 The present invention Figure 1 Enlarged schematic diagram of the middle V;

[0015] Figure 3-Figure 5 is a schematic diagram of a throttle valve sleeve assembly;

[0016] Figure 6 Axial force diagram when the cutoff is closed;

[0017] Figure 7 Sealed structure diagram at cut-off;

[0018] Figure 8-Figure 12 It is a schematic diagram of the valve core assembly;

[0019] Figure 13-Figure 15 is a schematic diagram of the valve seat assembly;

[0020] Fig.16 Schematic diagram of air flow under valve throttling opening;

[0021] Fig.17 Schematic diagram of air flow before the throttle valve is closed.

[0022] Among them: 1. Valve body, 2. Hexagon socket screw A, 3. WC valve seat protection sleeve, 4. O-ring A, 5. Valve seat, 6. Hexagon socket screw B, 7. O-ring B, 8. Valve core (stainless steel surfacing STL), 9. WC valve core protection sleeve, 10. Valve core column, 11. Locking screw A, 12 Valve core column balance hole, 13. WC valve core sleeve protection sleeve, 14 Locking screw B, 15. Valve core sleeve, 16. Valve cover, 17. Nut, 18. Stud, 19. Packing, 20. Packing gland, 21. Flat key, 22. Cross screw, 23. Bracket, 24. Bushing, 25. Steel pad, 26. Thrust Bearing, 27, stem nut, 28, pressing nut, 29, handwheel, 30, locking nut, 31, shield, 32, ruler, 33, valve position opening pointer, 34, cross screw, 35, locking screw, 36, O-ring C, 37, steel ball, 38, O-ring D, 39, triangular sealing ring, 40, valve core sleeve throttle hole, 41, WC valve core sleeve protective sleeve throttle hole, 42, valve core surfacing sealing surface, 43 valve seat surfacing sealing surface, 44, valve stem, 45, WC valve seat protective sleeve flushing surface, 46, WC valve core protective sleeve flushing surface, 47, WC valve core sleeve protective sleeve flushing throttle hole. DETAILED DESCRIPTION

[0023] The following will be combined with the attached Figure 1-Figure 17 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides a high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve and a design and manufacturing method for a conveniently replaced combined valve core, a combined valve sleeve, and a combined valve seat through improvements.

[0025] The natural gas coming out of the natural gas wellhead needs to be throttled and depressurized by the Christmas tree and the throttle valve before entering the gas gathering station. The natural gas coming out of the well has a high pressure (usually above PN260) and may also contain fine particles of impurities. Such working conditions have a strong impact on the scouring of the throttle valve. The requirements for the throttle stop valve that can both throttle and cut off are very high. The structural design and material of the general valve cannot meet the requirements of such working conditions. For this reason, a new valve structure and material selection have been developed and designed. During assembly, the valve core assembly, valve seat assembly, and throttle valve sleeve assembly are made of stainless steel that are subject to axial force, and the scouring is tungsten carbide, which saves costs and takes into account the convenience of replacing tungsten carbide parts.

[0026] The main components of the valve structure of the present invention include valve body 1, valve stem 44, valve cover 16, thrust bearing 26, valve stem nut 27, shaft sleeve 24, shield 31, scale 32, valve position opening pointer 33, etc. The valve seat assembly includes hexagon socket screw A2, WC valve seat protection sleeve 3, valve seat 5, valve seat surfacing sealing surface 43, wherein the WC valve seat protection sleeve 3 is made of stainless steel and mainly bears axial force, the valve seat 5 is eroded and made of tungsten carbide, and is not axial force during assembly; the valve core assembly includes hexagon socket screw B6, O-ring B 7. Valve core 8, WC valve core protection sleeve 9, valve core column 10, locking screw A11, triangular sealing ring 39, wherein the valve core 8 is made of stainless steel and is subjected to axial force transmission, the WC valve core protection sleeve 9 is protected by scouring, the valve core column 10 is made of stainless steel and is subjected to axial force transmission, the triangular sealing ring 39 is a triangular sealing ring (soft sealing pair), and the valve core surfacing sealing surface 42 is a hard alloy surfacing welded on the valve core 8; the throttle valve sleeve assembly includes a WC valve core sleeve protection sleeve 13, a locking screw B14, and a valve core sleeve 15. The WC valve core sleeve protection sleeve 13 is made of tungsten carbide, which can be protected by scouring and play a throttling and pressure reduction role, and the valve core sleeve 15 is made of stainless steel.

[0027] According to the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve described in the present application, the medium flow direction of the throttling stop valve is from the side flange to the lower flange, and the medium flow direction is away from the valve cover 16 and the valve core assembly; such a structural design can ensure that the sealing pair is not eroded by the medium flow, and the WC valve seat protection sleeve 3, WC valve core protection sleeve 9, and WC valve core sleeve protection sleeve 13 made of tungsten carbide play a protective role.

[0028] When the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve of the present invention is implemented; the valve core assembly Figure 7 The hexagon socket screw B6 in the middle serves as a connection, and a balancing hole is drilled in the middle of the screw; the valve core 8 made of stainless steel and the valve core column 10 made of stainless steel are connected by the hexagon socket screw B6; after the hexagon socket screw B6, the valve core 8, and the valve core column 10 are assembled, the O-ring B7 and the triangular sealing ring 39 are installed, and the WC valve core protection sleeve 9 made of tungsten carbide is threadedly connected to the valve core column 10 and locked by the locking screw A11, so that the triangular sealing ring 39 and the valve core welding sealing surface 42 formed after the valve core 8 and the WC valve core protection sleeve 9 are assembled are hidden under the WC valve core protection sleeve 9 corresponding to the valve core assembly, and the sealing pair is not affected by the erosion of the medium.

[0029] When the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve of the present invention is implemented, it is also very convenient if the WC valve core protection sleeve 9 needs to be replaced. When the throttling stop valve is working, the throttling hole 41 on the WC valve core sleeve protection sleeve of the throttling sleeve is changed by moving the valve core assembly up and down.

[0030] When the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve of the present invention is implemented; the valve seat surfacing sealing surface 43 is a hard alloy surfacing on the stainless steel valve seat 5, which is a hard sealing pair, and the sealing pair surface is lower than the erosion surface 45 of the WC valve seat protection sleeve 3 made of tungsten carbide. The WC valve seat protection sleeve 3 and the valve seat 5 are connected by the hexagon socket screw A2; the WC valve seat protection sleeve 3 is subjected to axial force during assembly and closing, and the valve seat 5 only plays a protective role, which is convenient for disassembly and replacement.

[0031] For the throttle valve sleeve assembly, there are several evenly distributed approximately conical throttling holes 41 on the WC valve core sleeve protective sleeve in the axial design. The area of ​​all the holes is designed according to the valve flow rate. The length of the conical hole can be divided into ten equal parts. The equivalent diameter corresponding to the throttling area of ​​each equal part is 0.4-0.8mm larger than the previous diameter, which meets the equal percentage flow characteristic design; the WC valve core sleeve protective sleeve 13 and the valve core sleeve 15 are threadedly connected and locked by the locking screw B14. After assembly, the valve core sleeve throttling hole 40 on the valve core sleeve 15 is assembled and processed according to the throttling hole of the WC valve core sleeve protective sleeve 13, and the WC valve core sleeve protective sleeve 13 is subjected to throttling erosion.

[0032] When the high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve described in the present invention is implemented; the shut-off function of this throttling stop valve is very good. When the valve core assembly moves downward to the lower edge of the throttling conical hole of the throttle valve sleeve, the main flow medium is cut off, and a small amount of medium will flow from the fitting gap formed by the WC valve core protection sleeve 9 and the valve core sleeve 15. Because the fitting gap formed by the WC valve core protection sleeve 9 and the valve core sleeve 15 is much smaller than the flow area behind, the medium will take away the impurities and other debris in the sealing pair space. When the valve core assembly moves to the closed position, the soft sealing pair and the hard sealing pair can play a very good sealing effect and can achieve zero leakage.

[0033] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve, characterized in that; The structure of the throttle valve comprises a valve body (1), a valve seat assembly, a valve core assembly, and a throttle valve sleeve assembly; the seal is a double-mass seal formed by a soft seal pair and a hard seal pair of a cladding alloy; The valve seat assembly comprises a hexagon socket screw A (2), a WC valve seat protection sleeve (3), a valve seat (5) and a valve seat cladding sealing surface (43), wherein the WC valve seat protection sleeve (3) is made of stainless steel and is capable of withstanding axial forces, and the valve seat (5) is subject to erosion and is made of tungsten carbide and is not subject to axial forces during assembly; The valve seat welding sealing surface (43) is welded on the stainless steel valve seat (5), the valve seat (5) corresponds to the side surface of the WC valve seat protection sleeve (3), and the WC valve seat protection sleeve (3) and the valve seat (5) are connected by a hexagon socket screw A (2); The valve core assembly comprises a hexagon socket screw B (6), an O-ring B (7), a valve core (8), a WC valve core protection sleeve (9), a valve core column (10), a locking screw A (11) and a triangular sealing ring (39), wherein the valve core (8) is made of stainless steel and is subjected to axial force transmission, the WC valve core protection sleeve (9) is subjected to erosion and plays a protective role, the valve core column (10) is made of stainless steel and is subjected to axial force transmission, the triangular sealing ring (39) is a soft sealing pair, and a valve core welding sealing surface (42) made of hard alloy is welded on the valve core (8); The valve core (8) made of stainless steel is located below the valve core column (10), and the valve core (8) made of stainless steel is connected to the valve core column (10) by a hexagon socket screw B (6); the WC valve core protection sleeve (9) corresponds to the outer side of the valve core (8), and an O-ring B (7) and a triangular sealing ring (39) are arranged between the two; the WC valve core protection sleeve (9) and the valve core column (10) are threadedly connected and locked by a locking screw A (11); The throttle valve sleeve assembly comprises a WC valve core sleeve protective sleeve (13), a locking screw B (14) and a valve core sleeve (15). The WC valve core sleeve protective sleeve (13) is made of tungsten carbide and can be protected from erosion and play a throttling and pressure reducing role. The valve core sleeve (15) is made of stainless steel. The WC valve core sleeve protection sleeve (13) is located outside the valve core sleeve (15). The WC valve core sleeve protection sleeve (13) and the valve core sleeve (15) are threadedly connected and locked by a locking screw B (14).

2. The high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve according to claim 1, characterized in that; The medium of the throttling stop valve flows in from the side flange and out from the lower flange, and the medium flows away from the valve cover (16) and the valve core assembly; the WC valve seat protection sleeve (3), the WC valve core protection sleeve (9) and the WC valve core sleeve protection sleeve (13) are respectively made of tungsten carbide.

3. The high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve according to claim 1, characterized in that; The hexagon socket screw B (6) in the valve core assembly plays a connecting role. A balancing hole is drilled in the middle of the hexagon socket screw B (6). After the hexagon socket screw B (6), the valve core (8) and the valve core column (10) are assembled, the O-ring B (7) and the triangular sealing ring (39) are assembled. The triangular sealing ring (39) and the valve core welding sealing surface (42) formed after the valve core (8) and the WC valve core protection sleeve (9) are assembled are hidden under the WC valve core protection sleeve (9) corresponding to the valve core assembly, so that the sealing pair is not eroded by the medium.

4. The high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve according to claim 1, characterized in that: The throttle valve is realized by moving the valve core assembly up and down to change the throttle hole (41) on the WC valve core sleeve protective sleeve of the WC valve core protective sleeve (9) and the WC valve core sleeve protective sleeve (13) during throttling operation.

5. The high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve according to claim 1, characterized in that; The valve seat cladding sealing surface (43) is a hard alloy cladding-welded on a stainless steel valve seat (5), forming a hard seal pair, and the hard seal pair surface is lower than the flushing surface (45) of a WC valve seat protection sleeve (3) made of tungsten carbide; when the WC valve seat protection sleeve (3) is subjected to axial force during assembly and closing, the valve seat (5) only plays a protective role.

6. The high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve according to claim 1, characterized in that; The WC valve core sleeve protective sleeve (13) is axially designed with a number of evenly distributed conical WC valve core sleeve protective sleeve throttle holes (41). The areas of all throttle holes are designed according to the valve flow rate. The length of the conical throttle hole is divided into ten equal parts. The equivalent diameter corresponding to the throttle area of ​​each equal part is 0.4-0.8mm larger than the previous diameter, meeting the equal percentage flow characteristic design. After assembly, the valve core sleeve throttle hole (40) on the valve core sleeve (15) is assembled and processed according to the WC valve core sleeve protective sleeve throttle hole (41) of the WC valve core sleeve protective sleeve (13). The WC valve core sleeve protective sleeve (13) withstands throttling erosion.

7. The high-pressure erosion-resistant equal-percentage throttling characteristic throttle valve according to claim 1, characterized in that: When the valve core assembly moves downward to the lower edge of the throttle hole (41) on the WC valve core sleeve protective sleeve, the main flow medium is cut off, and a small amount of medium will flow through the matching gap formed by the WC valve core protective sleeve (9) and the valve core sleeve (15). Because the matching gap formed by the WC valve core protective sleeve (9) and the valve core sleeve (15) is smaller than the flow area behind, the medium will carry away the impurities and particles in the sealing sub-space.

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