Ultra-low temperature and high pressure angle pressure balanced plunger valve

Abstract

The present invention belongs to the technical field of ultra-low temperature valves, and specifically relates to an ultra-low temperature high-pressure angle pressure-balanced plunger regulating valve, comprising a valve body, a valve cover, an extended bracket, and a driving device connected in sequence, wherein a cylindrical valve cavity and an outlet cavity located on one side of the cylindrical valve cavity and connected to the cylindrical valve cavity are provided in the valve body, and the valve core is a cylindrical plunger structure adapted to the cylindrical valve cavity, and a valve seat is fixed in the outlet cavity, and a valve seat sealing end face that seals with the cylindrical rotating surface of the valve core is provided on the valve seat. When the plunger regulating valve provided by the present invention is used, the vortex and cavitation generated by the fluid medium are on the inner wall of the plunger valve core, that is, the non-sealing surface, which does not affect the sealing effect, effectively improves the service life, and does not cause jitter under high pressure difference conditions, and the manufacturing process is simple and cost-saving. It is simple to replace and easy to install.

Description

Technical Field

[0001] The invention belongs to the technical field of ultra-low temperature valves, and in particular relates to an ultra-low temperature and high pressure angle pressure balanced plunger regulating valve. Background Art

[0002] The plunger valve is a valve driven by an extended valve stem and opened and closed by 90-degree rotation or axial displacement around the valve core axis. It can also be used to regulate and control fluid flow and is widely used in the fields of petroleum, petrochemical, chemical, power plants, metallurgy, etc. In the low-temperature medium working conditions of the LNG system, higher requirements are put forward for cryogenic valves, and functional requirements such as online repairability, high performance, low leakage, and long life are put forward. At present, many cryogenic regulating valves serving in LNG receiving stations still use the plug-shaped single-seat structure, porous sleeve balance structure, multi-stage pressure reduction structure, and labyrinth valve core structure used in the conventional market. This type of regulating valve can barely be used under simple working conditions such as conventional gases and liquids, but in special gases such as LNG liquefied natural gas, under ultra-low temperature conditions, cavitation and flashing will occur in the valve cavity, which often causes permanent and irreversible deformation of the sealing structure, resulting in internal or external leakage of the valve, causing frequent accidents at the receiving station. In addition, the plunger valves currently in service in the market or industrial sites are basically of lifting type structure, and the valve core is generally of suspended plug type or sleeve type structure. After the suspended valve core is opened, the valve core is suspended in the air, which is easily eroded to cause cavitation or the valve stem is subjected to unstable force and causes breakage; the seal of the sleeve type plunger valve is generally designed on the inner wall of the sleeve, which is not resistant to erosion and is prone to vibration and noise after the valve core is lifted.

[0003] Angle plunger valves can be used in locations with limited installation space. One valve can be used for multiple purposes. One angle plunger valve can replace the traditional valve + elbow structure. However, there is a lack of angle plunger valves with long service life that can be used under ultra-low temperature conditions on the market. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide an ultra-low temperature and high pressure angle pressure balanced plunger regulating valve.

[0005] The technical solution adopted by the present invention is as follows: an ultra-low temperature and high pressure angle pressure balance plunger regulating valve, comprising a valve body, a valve cover, an extended bracket, and a driving device connected in sequence, the driving device is connected to a valve stem and can drive the valve stem to rotate, the valve stem passes through the extended bracket and the valve cover and extends into the valve body to connect to a valve core located in the valve body, a cylindrical valve cavity and an outlet cavity located on one side of the cylindrical valve cavity and connected to the cylindrical valve cavity are provided in the valve body, the two ends of the cylindrical valve cavity are openings, the valve body is respectively connected to an inlet end cover and a valve cover at the two ends of the cylindrical valve cavity, and an inlet cavity is provided in the inlet end cover;

[0006] The valve core is a cylindrical plunger structure adapted to the cylindrical valve cavity. The valve core is arranged in the cylindrical valve cavity and is rotatable relative to the valve body, and the two ends of the valve core are respectively abutted against the inlet end cover and the valve cover; the end of the valve core close to the valve cover is provided with a linkage hole that cooperates with the valve stem in a circumferential linkage manner, and the end away from the valve cover is provided with a valve core inlet connected to the inlet cavity, a valve core cavity is provided in the valve core, and a valve core outlet is provided on the side wall of the valve core, and the valve core outlet is arranged corresponding to the outlet cavity, and the fluid in the inlet cavity flows into the outlet cavity through the valve core inlet, the valve core cavity, and the valve core outlet in sequence;

[0007] A valve seat is fixed in the outlet cavity, and a valve seat sealing end surface which is sealingly matched with the cylindrical rotating surface of the valve core is provided on the valve seat.

[0008] The outlet cavity is cylindrical, and the central axis of the outlet cavity is arranged perpendicular to the central axis of the cylindrical valve cavity.

[0009] A fixing sleeve connected to the valve body is arranged outside the valve seat, and an elastic member is arranged between the valve seat and the fixing sleeve. Under the action of the elastic member, the sealing end face of the valve seat maintains sealing contact with the cylindrical rotating surface of the valve core.

[0010] The elastic member is a compression spring, and is provided with a plurality of springs arranged at equal intervals along the circumference; the fixing sleeve and the inner wall of the valve body are matched with a threaded structure, and the elastic force of the elastic member can be adjusted by rotating the fixing sleeve.

[0011] A sealing ring groove is arranged on the outer periphery of the valve seat, a single sealing energy storage ring is arranged in the sealing ring groove, and a sealing end of the single sealing energy storage ring is arranged toward the valve core.

[0012] The valve seat is formed by a combination of a first valve seat member and a second valve seat member. The valve seat sealing end face is arranged at the end face of the first valve seat member away from the second valve seat member. The outer periphery of the first valve seat member is grooved close to the second valve seat member to form a sealing ring groove. The end of the second valve seat member is raised to form a convex ring portion. The convex ring portion extends into the sealing ring groove to position the single sealing energy storage ring.

[0013] The valve core inlet and the valve core cavity are formed by a cylindrical groove coaxial with the valve core that is opened inwardly at one end of the valve core away from the valve cover; the inner diameter of the valve core inlet is larger than the inner diameter of the valve core inlet.

[0014] The outer peripheral surface of the valve core is provided with an annular groove, the inner wall of the annular groove is the valve core sealing surface that seals with the valve seat sealing end surface, and the other part of the valve core protruding relative to the annular groove is in contact with the inner wall of the cylindrical valve cavity.

[0015] The valve seat sealing end surface and the valve core sealing surface are sprayed with a hard sealing coating; one end of the inlet end cover abutting the valve core is provided with a positioning groove, and one end of the valve core abutting the inlet end cover is provided with a positioning convex ring matched with the positioning groove.

[0016] The extended bracket is provided with a drip plate, and a plurality of arc-shaped heat dissipation grooves are provided between the drip plate and the valve cover.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The plunger-type regulating valve core and valve seat provided by the present invention always maintain a stable fitting position during the opening and closing process, especially under high pressure difference working conditions, without causing jitter;

[0019] 2. Under high pressure difference conditions, the vortex and cavitation generated by the fluid medium are on the inner wall of the plunger valve core, that is, the non-sealing surface, which does not affect the sealing effect and effectively increases the service life;

[0020] 3. The valve core sealing ring surface is a cylindrical rotating surface, which is very easy to process. Compared with the cryogenic ball valve ball (valve core) commonly used in LNG, the plunger valve core has a lower processing difficulty coefficient and lower requirements for processing and testing equipment. The spherical valve core generally requires a high-precision three-coordinate testing instrument to verify its roundness. Secondly, the difficulty coefficient of matching and grinding the plunger valve core and the valve seat puts forward lower requirements for the grinding fixtures, making it easier to achieve the sealing effect required by the technology;

[0021] 4. For safety reasons, common valves for LNG transmission are generally designed as pre-valve pressure relief structures, which are generally achieved by opening a hole on the valve core. The upstream end of the valve core of the plunger-type regulating valve can be directly designed and processed into a structure connected to the upstream pipeline, and there is no medium residue in the middle cavity after the valve is closed, which effectively avoids the danger caused by abnormal pressure increase in the middle cavity.

[0022] 5. The plunger valve is designed in one piece, mainly composed of valve body, lower end cover, upper cover, valve core and other internal parts, of which the valve body and lower end cover can be processed as one piece. This design can achieve modularization, simplify the manufacturing process, and save costs. It is easy to replace and install. It can also be freely combined with the external connection form of the process pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0024] Figure 1 A schematic diagram of the structure of an embodiment of the present invention;

[0025] Figure 2 A cross-sectional view of a valve body structure in one embodiment of the present invention;

[0026] Figure 3 The three-dimensional structure schematic diagram (a) and cross-sectional view (b) of the valve core in one embodiment of the present invention;

[0027] Figure 4 It is a structural schematic diagram of a first valve seat member in an embodiment of the present invention;

[0028] Figure 5 for Figure 1 A magnified schematic diagram of part A;

[0029] Figure 6 Schematic diagram of the structure of the valve core and the valve seat in one embodiment of the present invention, (a) to (d) are schematic diagrams of the structure of different opening degrees from fully open to fully closed;

[0030] Figure 7 for Figure 1 A magnified schematic diagram of part B;

[0031] Figure 8 Schematic diagram of the structure of the valve core and the valve seat in another embodiment of the present invention, (a) to (d) are schematic diagrams of the structure of different opening degrees from fully open to fully closed;

[0032] Fig. 9 Schematic diagram of the structure of the valve stem end in one embodiment of the present invention (a) and Figure 1 A magnified schematic diagram of part C;

[0033] In the figure, 1, valve body; 101, cylindrical valve cavity; 102, outlet cavity; 2, valve cover; 201, spacer ring; 3, extended bracket; 301, arc-shaped heat dissipation groove; 4, driving device; 5, valve stem; 501; linkage part; 502, matching cylinder; 6, valve core; 601, linkage hole; 602, valve core inlet; 603, valve core cavity; 604, valve core outlet; 605, annular groove; 606, positioning convex ring; 607, matching hole; 7, inlet end cover; 701, inlet cavity; 702, positioning groove; 8, valve seat; 801, valve seat sealing end face; 802, sealing ring groove; 803, first valve seat member; 804, second valve seat member; 805, convex ring part; 806, spring limit cavity; 10, fixed sleeve; 11, elastic part; 12, single seal energy storage ring; 13, drip plate; 14, valve sleeve bearing; 15, lip seal ring; 16, sealing gasket. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are for explaining and understanding the present invention, but not for limiting the scope of protection of the present invention.

[0036] like Figure 1 As shown, an ultra-low temperature and high pressure angle pressure balance plunger regulating valve comprises a valve body 1, a valve cover 2, an extension bracket 3, and a driving device 4 connected in sequence. The driving device 4 is connected to a valve stem 5 and can drive the valve stem 5 to rotate. The valve stem 5 passes through the extension bracket 3 and the valve cover 2 and extends into the valve body 1 to connect to a valve core 6 located in the valve body 1. Figure 2 As shown, the valve body 1 is provided with a cylindrical valve cavity 101 and an outlet cavity 102 located on one side of the cylindrical valve cavity 101 and connected to the cylindrical valve cavity 101. Both ends of the cylindrical valve cavity 101 are openings. The valve body 1 is connected to the inlet end cover 7 and the valve cover 2 at both ends of the cylindrical valve cavity 101, respectively. The inlet end cover 7 is provided with an inlet cavity 701.

[0037] like Figure 3 As shown, the valve core 6 is a cylindrical plunger structure adapted to the cylindrical valve cavity 101, the valve core 6 is arranged in the cylindrical valve cavity 101 and is rotatable relative to the valve body 1, and the two ends of the valve core 6 are respectively abutted against the inlet end cover 7 and the valve cover 2; the end of the valve core 6 close to the valve cover 2 is provided with a linkage hole 601 that is circumferentially linked with the valve stem 5, and the end away from the valve cover 2 is provided with a valve core inlet 602 connected with the inlet cavity 701, a valve core cavity 603 is provided in the valve core 6, and a valve core outlet 604 is provided on the side wall of the valve core 6, and the valve core outlet 604 is arranged corresponding to the outlet cavity 102, and the fluid in the inlet cavity 701 flows into the outlet cavity 102 through the valve core inlet 602, the valve core cavity 603, and the valve core outlet 604 in sequence;

[0038] A valve seat 8 is fixed in the outlet cavity 102 , and a valve seat sealing end surface 801 is provided on the valve seat 8 to seal with the cylindrical rotating surface of the valve core 6 .

[0039] The outlet chamber 102 is cylindrical, and the central axis of the outlet chamber 102 is perpendicular to the central axis of the cylindrical valve chamber 101 .

[0040] The valve body 1, the valve cover 2, the extended bracket 3, and the driving device 4 are connected in sequence by fastening bolts.

[0041] like Fig. 9As shown in (a), the outer periphery of the valve stem 5 is provided with a linkage portion 501 adapted to the linkage hole 601, the linkage hole 601 is connected with the valve core cavity 603 through a cylindrical matching hole 607, and a matching cylinder 502 that is tightly matched with the matching hole 607 is provided at the lower end of the valve stem 5.

[0042] like Fig. 9 As shown in (b), a raised spacer ring 201 is provided on the inner wall of the valve cover 2, and the spacer ring 201 is loosely matched with the valve stem 5. A valve sleeve bearing 14 located at the lower side of the spacer ring 201 and a lip seal ring 15 located at the upper side of the spacer ring 201 are provided between the valve stem 5 and the valve cover 2. The sealing end of the lip seal ring 15 is arranged downward, and a sealing gasket 16 is provided between the extended bracket 3 on the valve cover 2 and the valve cover 2 to form a downward squeezing effect on the lip seal ring 15.

[0043] like Figure 5 As shown, a fixing sleeve 10 connected to the valve body 1 is provided on the outside of the valve seat 8, and an elastic member 11 is provided between the valve seat 8 and the fixing sleeve 10. Under the action of the elastic member 11, the valve seat sealing end face 801 maintains sealing contact with the cylindrical rotating surface of the valve core 6.

[0044] The elastic member 11 is a compression spring, and is provided with a plurality of them at equal intervals along the circumference; the fixing sleeve 10 is matched with the inner wall of the valve body 1 by a threaded structure, and the elastic force of the elastic member 11 can be adjusted by rotating the fixing sleeve 10 .

[0045] A sealing ring groove 802 is disposed on the outer periphery of the valve seat 8 , a single sealing energy storage ring 12 is disposed in the sealing ring groove 802 , and a sealing end of the single sealing energy storage ring 12 is disposed toward the valve core 6 .

[0046] The valve seat 8 is formed by combining a first valve seat member 803 and a second valve seat member 804. The valve seat sealing end face 801 is arranged on the end face of the first valve seat member 803 away from the second valve seat member 804. The first valve seat member 803 is grooved at its outer periphery close to the second valve seat member 804 to form a sealing ring groove 802. The end of the second valve seat member 804 is raised to form a convex ring portion 805. The convex ring portion 805 extends into the sealing ring groove 802 to position the single sealing energy storage ring 12. The valve seat 8 is arranged as a split body to facilitate the non-destructive disassembly and assembly of the single sealing energy storage ring 12, and reduce maintenance costs.

[0047] The valve core inlet 602 and the valve core cavity 603 are formed by a cylindrical groove coaxial with the valve core 6 opened inwardly at one end of the valve core 6 away from the valve cover 2 ; the inner diameter of the valve core inlet 602 is larger than the inner diameter of the valve core inlet 602 .

[0048] The outer peripheral surface of the valve core 6 is provided with an annular groove 605, and the inner wall of the annular groove 605 is a valve core sealing surface that is sealed with the valve seat sealing end face 801. The other parts of the valve core 6 that are raised relative to the annular groove 605 are in contact with the inner wall of the cylindrical valve cavity 101; the valve seat sealing end face 801 and the valve core sealing surface are sprayed with a hard sealing coating. The hard sealing coating can specifically be a hard sealing coating currently used in valve scenes, and this embodiment specifically uses a tungsten carbide wear-resistant coating. The other parts of the valve core 6 that are raised relative to the annular groove 605 are in contact with the inner wall of the cylindrical valve cavity 101 to ensure that the valve core is always in a stable contact position during the valve core switching process, especially under high pressure difference conditions, and will not cause jitter. The purpose of setting the annular groove 605 is to prevent the valve core sealing surface from being in contact with the inner wall of the valve body 1. During the valve core switching process, the valve core sealing surface and the inner wall of the valve body 1 always maintain a certain distance, and the valve core sealing surface only interacts with the valve seat sealing end face 801, thereby improving the service life of the hard sealing coating.

[0049] One end of the inlet cover 7 abutting against the valve core 6 is provided with a positioning groove 702 , and one end of the valve core 6 abutting against the inlet cover 7 is provided with a positioning convex ring 606 matched with the positioning groove 702 .

[0050] like Figure 1 As shown, a drip plate 13 is provided on the extended bracket 3, and a plurality of arc-shaped heat dissipation grooves 301 are provided between the drip plate 13 and the valve cover 2. The drip plate 13 is made of a plate, which is first flattened and connected to the extended bracket by friction welding to ensure its flatness and performance, and to ensure the heat dissipation of the valve. At present, the field of ultra-low temperature valve technology usually increases the heat dissipation area by lengthening the valve cover, opening annular heat dissipation grooves on the periphery of the lengthened valve cover, or adding heat dissipation plates, etc., wherein the annular heat dissipation grooves opened on the periphery of the lengthened valve cover are usually annular grooves with a rectangular cross-section. After a number of annular heat dissipation grooves of the above structure are opened on the periphery of the lengthened valve cover, the heat dissipation efficiency can be significantly improved, but the strength of the extended bracket 3 will also be significantly reduced, because the wall thickness of the extended bracket 3 with the annular heat dissipation grooves is significantly reduced, and it is relatively easy to bend under the action of external force. If the wall thickness of the extended bracket 3 is increased, the heat dissipation efficiency is affected. The arc-shaped heat dissipation groove 301 provided in this embodiment has an arc-shaped cross-section, that is, its surface is a concave surface. Although the wall thickness of the extended bracket 3 with the annular heat dissipation groove is reduced, the setting of the concave surface effectively improves the bending resistance of the extended bracket 3 and improves the strength of the overall extended bracket 3.

[0051] Compared with existing products, the plunger regulating valve provided in this embodiment has the following effects:

[0052] 1. The angle valve design structure can be used in locations with limited installation space. One valve can be used for multiple purposes. One angle plunger valve can replace the traditional valve + elbow structure.

[0053] 2. If Figure 1 As shown, the fluid in the inlet chamber 701 flows into the outlet chamber 102 through the valve core inlet 602, the valve core cavity 603, and the valve core outlet 604 in sequence. Since the valve seat sealing structure is located on the cylindrical rotating surface of the valve core at the outer periphery of the valve core outlet 604, the fluid first enters the valve core cavity 603, and the cavitation caused by the flow resistance all occurs in the inner cavity of the valve core, which does not affect the sealing surface at all. Therefore, it will not affect the valve seat sealing structure and can be used under any high pressure difference working conditions.

[0054] 3. The valve body 1, valve core 6 and inlet cover 7 can be integrally processed, such as Figure 2 As shown, the valve body 1 of this embodiment is easy to process, and its inner cavity is composed of two cylindrical through holes with perpendicular central axes, which can achieve high-precision processing at a low cost. At the same time, the valve core sealing ring surface belongs to the cylindrical rotation surface, which is very easy to process. Compared with the cryogenic ball valve ball (valve core) commonly used in LNG, the plunger valve core has a low processing difficulty coefficient and low requirements for processing and testing equipment. The spherical valve core generally requires a high-precision three-coordinate detection instrument to verify its roundness. Secondly, the difficulty coefficient of matching and grinding the plunger valve core and the valve seat puts forward lower requirements for the grinding fixtures, and it is easier to achieve the sealing effect required by the technology.

[0055] 4. Common valves for LNG transmission are generally designed as pre-valve pressure relief structures for safety reasons, which are generally achieved by opening a hole in the valve core. The plunger-type regulating valve provided in this embodiment adopts a post-valve sealing structure. The upstream end of the valve core is directly designed and processed into a structure connected to the upstream pipeline, and there is no medium residue in the middle cavity after the valve is closed, which effectively avoids the danger caused by abnormal pressure increase in the middle cavity.

[0056] 5. In this embodiment, the valve stem and the valve core are tightly matched, the radial force borne by the valve stem is small, and it is not easy to cause the valve stem to break.

[0057] 6. In the valve core of this embodiment, the valve core outlet 604 is arranged on the side wall of the valve core 6. The structure of the valve core outlet 604 can be adjusted according to the actual working conditions. The valve core outlet 604 can be arranged as follows: Figure 6 The long strip hole shown or Figure 8 The diamond holes shown or other shaped through holes give the valve different regulating performances, and can be made into linear, equal percentage and full-diameter types, with small flow resistance and controllable flow. The diamond holes can adapt to the cut-off and regulating functions of medium with particles.

[0058] 7. The upper and lower ends of the valve core of this embodiment are respectively restrained by the valve cover 2 and the inlet end cover 7, and the outer peripheral wall is restrained by the valve body and can only rotate in the circumferential direction. During the switching process of the valve core and the valve seat, especially under high pressure difference conditions, no jitter will occur, so it will not be generated.

[0059] 8. The valve stem of this embodiment is pressed tightly in the valve body, which effectively avoids the danger caused by the valve stem flying out under high pressure.

[0060] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An ultra-low temperature and high pressure angle pressure-balanced plunger regulating valve, comprising a valve body (1), a valve cover (2), an extended bracket (3), and a driving device (4) connected in sequence, wherein the driving device (4) is connected to a valve stem (5) and can drive the valve stem (5) to rotate, and the valve stem (5) passes through the extended bracket (3) and the valve cover (2) and extends into the valve body (1) to connect to a valve core (6) located in the valve body (1), characterized in that: The valve body (1) is provided with a cylindrical valve cavity (101) and an outlet cavity (102) located on one side of the cylindrical valve cavity (101) and connected to the cylindrical valve cavity (101); both ends of the cylindrical valve cavity (101) are openings; the valve body (1) is connected to an inlet end cover (7) and a valve cover (2) at both ends of the cylindrical valve cavity (101), respectively; and an inlet cavity (701) is provided in the inlet end cover (7); The valve core (6) is a cylindrical plunger structure adapted to the cylindrical valve cavity (101); the valve core (6) is arranged in the cylindrical valve cavity (101) and is rotatable relative to the valve body (1); and the two ends of the valve core (6) abut against the inlet end cover (7) and the valve cover (2) respectively; the end of the valve core (6) close to the valve cover (2) is provided with a linkage hole (601) that is circumferentially linked with the valve stem (5); and the end away from the valve cover (2) is provided with a valve core inlet (602) that is connected to the inlet cavity (701); a valve core cavity (603) is provided in the valve core (6); a valve core outlet (604) is provided on the side wall of the valve core (6); the valve core outlet (604) is arranged corresponding to the outlet cavity (102); and the fluid in the inlet cavity (701) flows into the outlet cavity (102) through the valve core inlet (602), the valve core cavity (603), and the valve core outlet (604) in sequence; A valve seat (8) is fixed in the outlet cavity (102), and a valve seat sealing end surface (801) is provided on the valve seat (8) for sealingly cooperating with the cylindrical rotating surface of the valve core (6).

2. The ultra-low temperature and high pressure angle pressure balanced plunger regulating valve according to claim 1 is characterized in that: The outlet chamber (102) is cylindrical, and the central axis of the outlet chamber (102) is arranged perpendicular to the central axis of the cylindrical valve chamber (101).

3. The ultra-low temperature and high pressure angle pressure balance plunger regulating valve according to claim 2 is characterized in that: A fixing sleeve (10) connected to the valve body (1) is provided on the outside of the valve seat (8), and an elastic member (11) is provided between the valve seat (8) and the fixing sleeve (10). Under the action of the elastic member (11), the sealing end surface (801) of the valve seat maintains sealing contact with the cylindrical rotating surface of the valve core (6).

4. The ultra-low temperature and high pressure angle pressure balance plunger regulating valve according to claim 3 is characterized in that: The elastic member (11) is a compression spring, and is provided with a plurality of springs arranged at equal intervals along the circumference; the fixing sleeve (10) and the inner wall of the valve body (1) are matched with a threaded structure, and the elastic force of the elastic member (11) can be adjusted by rotating the fixing sleeve (10).

5. The ultra-low temperature and high pressure angle pressure balance plunger regulating valve according to any one of claims 1 to 4, characterized in that: A sealing ring groove (802) is provided on the outer periphery of the valve seat (8), a single sealing energy storage ring (12) is provided in the sealing ring groove (802), and a sealing end of the single sealing energy storage ring (12) is arranged toward the valve core (6).

6. The ultra-low temperature and high pressure angle pressure balance plunger regulating valve according to claim 5 is characterized in that: The valve seat (8) is formed by combining a first valve seat component (803) and a second valve seat component (804); the valve seat sealing end face (801) is arranged on the end face of the first valve seat component (803) away from the second valve seat component (804); the outer periphery of the first valve seat component (803) is grooved near the second valve seat component (804) to form a sealing ring groove (802); the end of the second valve seat component (804) is raised to form a convex ring portion (805); the convex ring portion (805) extends into the sealing ring groove (802) to form a positioning effect for the single sealing energy storage ring (12).

7. The ultra-low temperature and high pressure angle pressure balance plunger regulating valve according to claim 1, characterized in that: The valve core inlet (602) and the valve core cavity (603) are formed by a cylindrical groove coaxial with the valve core (6) formed inwardly at one end of the valve core (6) away from the valve cover (2); the inner diameter of the valve core inlet (602) is larger than the inner diameter of the valve core inlet (602).

8. The ultra-low temperature and high pressure angle pressure balance plunger regulating valve according to claim 1, characterized in that: The outer peripheral surface of the valve core (6) is provided with an annular groove (605), the inner wall of the annular groove (605) is a valve core sealing surface that is sealed with the valve seat sealing end surface (801), and the other part of the valve core (6) protruding relative to the annular groove (605) is in contact with the inner wall of the cylindrical valve cavity (101); the valve seat sealing end surface (801) and the valve core sealing surface are sprayed with a hard sealing coating.

9. The ultra-low temperature and high pressure angle pressure balanced plunger regulating valve according to claim 1, characterized in that: One end of the inlet end cover (7) abutting against the valve core (6) is provided with a positioning groove (702), and one end of the valve core (6) abutting against the inlet end cover (7) is provided with a positioning convex ring (606) matching with the positioning groove (702).

10. The ultra-low temperature and high pressure angle pressure balance plunger regulating valve according to claim 1, characterized in that: The extended bracket (3) is provided with a drip plate (13), and a plurality of arc-shaped heat dissipation grooves (301) are provided between the drip plate (13) and the valve cover (2).

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