CN112943962A

CN112943962A - Ultra-low temperature high pressure angle type pressure balance plunger valve

Info

Publication number: CN112943962A
Application number: CN202110394616.1A
Authority: CN
Inventors: 刘智; 张智博; 蔡毅; 叶志强; 杨贵春; 蔡文博
Original assignee: TEJI VALVE GROUP CO Ltd
Current assignee: TEJI VALVE GROUP CO Ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2021-06-11

Abstract

The invention belongs to the technical field of ultralow temperature valves, and particularly relates to an ultralow temperature high pressure angle type pressure balance plunger regulating valve which comprises a valve body, a valve cover, a lengthened support and a driving device which are sequentially connected, wherein a cylindrical valve cavity and an outlet cavity which is positioned on one side of the cylindrical valve cavity and is connected with the cylindrical valve cavity are arranged in the valve body, the valve core is of a cylindrical plunger structure matched with the cylindrical valve cavity, a valve seat is fixed in the outlet cavity, and a valve seat sealing end face in sealing fit with a cylindrical revolution face of the valve core is arranged on the valve seat. When the plunger type regulating valve provided by the invention is used, the vortex and the cavitation generated by the fluid medium are on the inner wall of the plunger valve core, namely a non-sealing surface, the sealing effect is not influenced, the service life is effectively prolonged, the plunger type regulating valve does not shake under the working condition of high pressure difference, the manufacturing process is simple, and the cost is saved. The replacement is simple, and the installation is convenient.

Description

Ultra-low temperature high pressure angle type pressure balance plunger valve

Technical Field

The invention belongs to the technical field of ultralow temperature valves, and particularly relates to an ultralow temperature high pressure angle type pressure balance plunger regulating valve.

Background

The plunger valve is a valve which is driven by an extension valve rod and can rotate 90 degrees around the axis of a valve core or axially displace to open and close, can also be used for regulating and controlling the flow of fluid, and is widely applied to the fields of petroleum, petrifaction, chemical industry, power plants, metallurgy and the like. In the low-temperature medium working condition of the LNG system, higher requirements are put forward on a low-temperature valve, and functional requirements of online maintainability, high performance, low leakage, long service life and the like are put forward. Currently, many cryogenic regulating valves in service on LNG receiving stations still use the plug-shaped single seat structure, porous sleeve balance structure, multi-stage depressurization structure and labyrinth valve core structure used in the conventional market. The regulating valve can be used under simple working conditions of conventional gas, liquid and the like, and under special gas and ultralow-temperature working conditions of LNG liquefied natural gas and the like, cavitation and flash evaporation can occur in the valve cavity, so that the deformation of the sealing structure which can be permanently and irrecoverable can often cause the internal leakage or the external leakage of the valve, and the large and small accidents on the site of a receiving station are frequent. In addition, the existing plunger valves in the market or industrial field are basically of lifting type structures, the valve core is generally of a suspended plug type or sleeve type structure, and after the suspended valve core is opened, the valve core is suspended and is easily washed to cause cavitation or the valve rod is stressed unstably to cause fracture; the sleeve type plunger valve is generally designed on the inner wall of the sleeve, is not resistant to scouring, and is easy to generate vibration and noise after the valve core is lifted.

The angle type plunger valve is adaptable to the position with limited installation space, one valve is multipurpose, the structure of one valve and an elbow in the prior art can be replaced by the angle type plunger valve, but the angle type plunger valve which is used under the ultralow temperature working condition and has long service life is absent in the market at present.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an ultralow-temperature high-pressure angle type pressure balance plunger regulating valve.

The technical scheme adopted by the invention is as follows: an ultralow-temperature high-pressure angle type pressure balance plunger regulating valve comprises a valve body, a valve cover, an extension support and a driving device which are sequentially connected, wherein the driving device is connected with a valve rod and can drive the valve rod to rotate;

the valve core is of a cylindrical plunger structure matched with the cylindrical valve cavity, the valve core is arranged in the cylindrical valve cavity and can be rotatably arranged relative to the valve body, and two ends of the valve core respectively abut against the inlet end cover and the valve cover; one end of the valve core close to the valve cover is provided with a linkage hole matched with the valve rod in a circumferential linkage manner, one end of the valve core far away from the valve cover is provided with a valve core inlet communicated with the inlet cavity, a valve core cavity is arranged in the valve core, a valve core outlet is arranged on the side wall of the valve core, the valve core outlet is arranged corresponding to the outlet cavity, and fluid entering the oral cavity flows into the outlet cavity through the valve core inlet, the valve core cavity and the valve core outlet in sequence;

and a valve seat is fixed in the outlet cavity, and a valve seat sealing end face which is in sealing fit with the cylindrical revolution surface of the valve core is arranged on the valve seat.

The outlet cavity is cylindrical, and the central shaft of the outlet cavity is perpendicular to the central shaft of the cylindrical valve cavity.

The outer side of the valve seat is provided with a fixing sleeve connected with the valve body, an elastic part is arranged between the valve seat and the fixing sleeve, and the sealing end face of the valve seat is in sealing contact with the cylindrical revolution surface of the valve core under the action of the elastic part.

The elastic piece is a compression spring and is provided with a plurality of elastic pieces which are arranged at equal intervals along the circumference; the fixed sleeve is matched with the inner wall of the valve body in a threaded structure, and the elasticity of the elastic part can be adjusted by rotating the fixed sleeve.

The periphery of the valve seat is provided with a sealing ring groove, a single sealing energy storage ring is arranged in the sealing ring groove, and the sealing end of the single sealing energy storage ring is arranged towards the direction of the valve core.

The disk seat forms for first valve seat spare and second valve seat spare combination, the sealed terminal surface of disk seat sets up in the terminal surface that second valve seat spare was kept away from to first valve seat spare, first valve seat spare periphery is close second valve seat spare fluting and is formed sealed annular, the protruding collar portion that forms of second valve seat spare tip, collar portion stretches into in the sealed annular to form the positioning action to single sealed energy storage circle.

The valve core inlet and the valve core cavity are formed by inwards arranging a cylindrical groove coaxial with the valve core at one end of the valve core far away from the valve cover; the inner diameter of the valve core inlet is larger than that of the valve core inlet.

The outer peripheral surface of the valve core is provided with an annular groove, the inner wall of the annular groove is a valve core sealing surface which is in sealing fit with the sealing end surface of the valve seat, and the other part of the valve core, which is raised relative to the annular groove, is attached to the inner wall of the cylindrical valve cavity.

Hard sealing coatings are sprayed on the sealing end surfaces of the valve seats and the sealing surfaces of the valve cores; and one end of the inlet end cover, which is abutted against the valve core, is provided with a positioning groove, and one end of the valve core, which is abutted against the inlet end cover, is provided with a positioning convex ring matched with the positioning groove.

The lengthened support is provided with a water dropping plate, and a plurality of arc moon-shaped heat dissipation grooves are arranged between the water dropping plate and the valve cover.

The invention has the following beneficial effects:

1. in the opening and closing processes of the valve core and the valve seat of the plunger type regulating valve, the stable attaching position is always kept, and particularly under the working condition of high pressure difference, the plunger type regulating valve cannot shake;

2. under the working condition of high pressure difference, vortex and cavitation generated by the fluid medium are on the inner wall of the plunger valve core, namely a non-sealing surface, so that the sealing effect is not influenced, and the service life is effectively prolonged;

3. the valve core sealing ring surface belongs to a cylinder revolution surface, is extremely easy to process, and compared with a low-temperature ball valve ball (valve core) commonly used by LNG, the processing difficulty coefficient of the plunger valve core is low, the requirements on processing and detection equipment are low, and the roundness of the ball valve core can be verified by a high-precision three-coordinate detection instrument. Secondly, the match grinding difficulty coefficient of the valve core and the valve seat of the plunger valve puts forward lower requirements on a grinding tool fixture, and the sealing effect of the technical requirements is more easily achieved;

4. in a common valve for driving LNG, the common valve is generally designed as a pressure relief structure in front of the valve for the sake of safety, and the common valve is generally realized by opening a hole on a valve core; the upstream end of the valve core of the plunger type regulating valve can be directly designed and processed into a structure communicated with an upstream pipeline, and the middle cavity has no medium residue after the valve is closed, so that the danger caused by abnormal boosting of the middle cavity is effectively avoided;

5. the plunger valve is designed in an integrated mode and mainly comprises a valve body, a lower end cover, an upper cover, a valve core and other internal parts, wherein the valve body and the lower end cover can be integrally machined. The replacement is simple, and the installation is convenient. And can be freely combined with the external connection form of the process pipeline.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the valve body structure in one embodiment of the present invention;

FIG. 3 is a schematic perspective view (a) and a sectional view (b) of a valve core according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of the construction of a first valve seat member in one embodiment of the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 1;

FIG. 6 is a schematic structural diagram of a valve element and a valve seat in an embodiment of the present invention, wherein (a) - (d) are respectively schematic structural diagrams of different opening degrees from full-open to full-close;

FIG. 7 is an enlarged view of portion B of FIG. 1;

FIG. 8 is a schematic structural diagram of a valve element and a valve seat in another embodiment of the present invention, in which (a) - (d) are respectively configured from fully open to fully closed with different opening degrees;

FIG. 9 is a schematic view (a) of the end of the valve stem according to an embodiment of the present invention and an enlarged view of the portion C of FIG. 1;

in the figure, 1, a valve body; 101, a cylindrical valve cavity; 102, an outlet chamber; 2, a valve cover; 201, a spacer ring; 3, lengthening the bracket; 301, arc moon shaped heat sink; 4, a driving device; 5, a valve rod; 501; a linkage section; 502, a fitting cylinder; 6, a valve core; 601, a linkage hole; 602, a spool inlet; 603, a spool cavity; 604, a spool outlet; 605, an annular groove; 606, positioning the convex ring; 607, a mating hole; 7, an inlet end cover; 701, an inlet cavity; 702, positioning grooves; 8, a valve seat; 801, valve seat sealing end face; 802, sealing ring groove; 803, a first valve seat member; 804, a second valve seat member; 805, a collar portion; 806, a spring limit cavity; 10, fixing a sleeve; 11, an elastic member; 12, a single sealing energy storage ring; 13, a water dropping plate; 14, a valve housing bearing; 15, lip-shaped sealing rings; 16, a sealing gasket.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

The terms of direction and position of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.

As shown in fig. 1, an ultra-low temperature high pressure angle type pressure balance plunger regulating valve comprises a valve body 1, a valve cover 2, a lengthened support 3 and a driving device 4 which are connected in sequence, wherein the driving device 4 is connected with a valve rod 5 and can drive the valve rod 5 to rotate, the valve rod 5 penetrates through the lengthened support 3 and the valve cover 2 and extends into the valve body 1 to be connected with a valve core 6 positioned in the valve body 1, as shown in fig. 2, a cylindrical valve cavity 101 and an outlet cavity 102 which is positioned at one side of the cylindrical valve cavity 101 and is connected with the cylindrical valve cavity 101 are arranged in the valve body 1, two ends of the cylindrical valve cavity 101 are provided with openings, the valve body 1 is respectively connected with an inlet end cover 7 and the valve cover 2 at two ends of the;

as shown in fig. 3, the valve core 6 is a cylindrical plunger structure adapted to the cylindrical valve cavity 101, the valve core 6 is disposed in the cylindrical valve cavity 101 and is rotatably disposed relative to the valve body 1, and two ends of the valve core 6 respectively abut against the inlet end cover 7 and the valve cover 2; one end of the valve core 6 close to the valve cover 2 is provided with a linkage hole 601 matched with the valve rod 5 in a circumferential linkage manner, one end of the valve core 6 far away from the valve cover 2 is provided with a valve core inlet 602 communicated with the inlet cavity 701, a valve core cavity 603 is arranged in the valve core 6, the side wall of the valve core 6 is provided with a valve core outlet 604, the valve core outlet 604 is arranged corresponding to the outlet cavity 102, and 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 face 801 in sealing fit with the cylindrical revolution surface of the valve core 6 is arranged on the valve seat 8.

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.

The valve body 1, the valve cover 2, the lengthened support 3 and the driving device 4 are sequentially connected through fastening bolts.

As shown in fig. 9 (a), the valve rod 5 is provided at its outer periphery with an interlocking portion 501 adapted to the interlocking hole 601, the interlocking hole 601 is engaged with the valve body cavity 603 through a cylindrical fitting hole 607, and a fitting cylinder 502 tightly fitted to the fitting hole 607 is provided at the lower end portion of the valve rod 5.

As shown in fig. 9 (b), a raised spacer ring 201 is provided on the inner wall of the bonnet 2, the spacer ring 201 is in clearance fit with the valve rod 5, a valve sleeve bearing 14 located on the lower side of the spacer ring 201 and a lip seal 15 located on the upper side of the spacer ring 201 are provided between the valve rod 5 and the bonnet 2, the sealing end of the lip seal 15 is arranged downward, a sealing gasket 16 is provided between the extension bracket 3 located on the bonnet 2 and the bonnet 2, and downward extrusion is performed on the lip seal 15.

As shown in fig. 5, a fixing sleeve 10 connected with the valve body 1 is arranged on the outer side of the valve seat 8, an elastic member 11 is arranged between the valve seat 8 and the fixing sleeve 10, and a sealing end face 801 of the valve seat is kept in sealing contact with a cylindrical revolution surface of the valve core 6 under the action of the elastic member 11.

The elastic piece 11 is a compression spring and is provided with a plurality of elastic pieces which are arranged at equal intervals along the circumference; the fixed sleeve 10 is matched with the inner wall of the valve body 1 by adopting a thread structure, and the elasticity of the elastic part 11 can be adjusted by rotating the fixed sleeve 10.

The periphery of the valve seat 8 is provided with a sealing ring groove 802, a single sealing energy storage ring 12 is arranged in the sealing ring groove 802, and the sealing end of the single sealing energy storage ring 12 faces the direction of the valve core 6.

The valve seat 8 is formed by combining a first valve seat element 803 and a second valve seat element 804, the valve seat sealing end face 801 is arranged on the end face, away from the second valve seat element 804, of the first valve seat element 803, the periphery of the first valve seat element 803 is grooved close to the second valve seat element 804 to form a sealing ring groove 802, the end part of the second valve seat element 804 is bulged to form a convex ring part 805, and the convex ring part 805 extends into the sealing ring groove 802 to form a positioning effect on the single-seal energy storage ring 12. The valve seat 8 is arranged to be split, so that the single-sealing energy storage ring 12 can be conveniently dismounted without damage, and the maintenance cost is reduced.

The valve core inlet 602 and the valve core cavity 603 are formed by inwards forming a cylindrical groove coaxial with the valve core 6 at one end of the valve core 6 far away from the valve cover 2; the spool inlet 602 has an inner diameter greater than the spool inlet 602.

The 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 which is in sealing fit with the valve seat sealing end surface 801, and other parts of the valve core 6 which are convex relative to the annular groove 605 are attached to the inner wall of the cylindrical valve cavity 101; and hard sealing coatings are sprayed on the surfaces of the valve seat sealing end face 801 and the valve core sealing face. The hard seal coating may be a hard seal coating currently used in a valve scene, and the embodiment specifically uses a tungsten carbide wear-resistant coating. The other part of the valve core 6 protruding relative to the annular groove 605 is attached to the inner wall of the cylindrical valve cavity 101, so that the position of stable attachment is always kept in the valve core opening and closing process, particularly, the valve core does not shake under the working condition of high pressure difference, the annular groove 605 is arranged to ensure that the sealing surface of the valve core is not attached to the inner wall of the valve body 1, a certain distance is always kept between the sealing surface of the valve core and the inner wall of the valve body 1 in the valve core opening and closing process, the sealing surface of the valve core only interacts with the sealing end surface 801 of the valve seat, and the service life.

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

As shown in fig. 1, the elongated bracket 3 is provided with a drip plate 13, and a plurality of arc-moon-shaped heat dissipation grooves 301 are formed between the drip plate 13 and the bonnet 2. The water dripping plate 13 is made of a plate, the plate is firstly leveled and is connected with the lengthened bracket by friction welding, so that the flatness and performance of the water dripping plate are ensured, and the heat dissipation performance of the valve is ensured. At present, in the technical field of ultra-low temperature valves, the valve cover is usually lengthened, and the heat dissipation area is increased by arranging annular heat dissipation grooves or heat dissipation plates on the periphery of the lengthened valve cover, wherein the annular heat dissipation grooves arranged on the periphery of the lengthened valve cover are usually annular grooves with rectangular cross sections, after a plurality of annular heat dissipation grooves with the structure are arranged on the periphery of the lengthened valve cover, the heat dissipation efficiency can be obviously improved, but the strength of the lengthened bracket 3 is also obviously reduced, because the wall thickness of the part of the lengthened bracket 3 provided with the annular heat dissipation grooves is obviously reduced, the lengthened bracket is relatively easy to bend under the action of external force, if the wall thickness of the lengthened bracket 3 is increased, the heat dissipation efficiency is affected, the arc-moon-shaped heat dissipation grooves 301 arranged in the embodiment have the arc-moon-shaped cross sections, namely the surfaces of the arc-moon-shaped heat dissipation grooves are concave curved surfaces, although the wall thickness, the strength of the whole lengthened bracket 3 is improved.

The plunger governing valve that this embodiment provided compares current product and has following effect:

1. the angle valve design structure is adopted, the angle valve can be suitable for positions with limited installation space, one valve has multiple functions, and the traditional structure of one valve and an elbow can be replaced by one angle type plunger valve.

2. As shown in FIG. 1, the fluid in the inlet chamber 701 flows into the outlet chamber 102 sequentially through the valve core inlet 602, the valve core cavity 603 and the valve core outlet 604, because the valve seat sealing structure is located on the cylindrical revolution surface of the valve core at the periphery of the valve core outlet 604, the fluid firstly flows into the valve core cavity 603, cavitation generated by flow resistance is completely generated in the inner cavity of the valve core, and the sealing surface is not influenced at all, so that the valve seat sealing structure is not influenced, and the valve seat sealing structure can be used under any high pressure difference working condition.

3. Valve body 1, 6 inlet end covers 7 of case can be formed by integrated processing, as shown in fig. 2, the processing of valve body 1 of this embodiment is simple, its inner chamber comprises two central axis vertically cylindrical through-holes, can realize high accuracy processing under lower cost condition, simultaneously, the sealed anchor ring face of case belongs to the cylinder surface of revolution, very easily processing, for the low temperature ball valve spheroid (case) that LNG is commonly used, the processing degree of difficulty coefficient of plunger case is low, it is low to processing and check out test set requirement, the circularity can only be verified to the three-coordinate detecting instrument of the general high accuracy of spherical case. Secondly, the match grinding difficulty coefficient of the plunger valve core and the valve seat puts forward lower requirements on a grinding tool fixture, and the sealing effect of the technical requirements can be achieved more easily.

4. In a common valve for driving LNG, the common valve is generally designed as a pressure relief structure in front of the valve for the sake of safety, and the common valve is generally realized by opening a hole on a valve core; the plunger type regulating valve provided by the embodiment adopts a rear valve sealing structure; the upper end of the valve core is directly designed and processed into a structure communicated with an upper pipeline, and the middle cavity has no medium residue after the valve is closed, so that the danger caused by abnormal boosting of the middle cavity is effectively avoided.

5. In the embodiment, the valve rod is tightly matched with the valve core, and the radial force borne by the valve rod is small, so that the valve rod is not easy to break.

6. In the valve core of the 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 condition requirements, and the valve core outlet 604 can be arranged as a long strip-shaped hole as shown in fig. 6 or a diamond hole as shown in fig. 8 or a through hole with other shapes, so that the valve has different adjusting performances, can be made into a linear type, an equal percentage type and a full-diameter type, and has small flow resistance and controllable flow. The diamond holes can adapt to the cutting and adjusting functions of the medium with particles.

7. The upper end and the lower end of the valve core of the embodiment are respectively propped against the limit by the valve cover 2 and the inlet end cover 7, the peripheral wall is limited by the valve body and can only rotate circumferentially, and shaking cannot be caused in the process of opening and closing the valve core and the valve seat, especially under the working condition of high pressure difference, so that shaking cannot be caused.

8. The valve rod of this embodiment is compressed tightly in the valve body, effectively avoids the danger that the valve rod departure caused under the high pressure condition.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims

1. The utility model provides an ultra-low temperature high pressure angle type pressure balance plunger governing valve, includes consecutive valve body (1), valve gap (2), extension support (3), drive arrangement (4) are connected valve rod (5) and can be driven valve rod (5) and rotate, valve rod (5) are passed extension support (3), valve gap (2) and are stretched into valve body (1) and connect case (6) that are located valve body (1), its characterized in that: the valve body (1) is internally provided with a cylindrical valve cavity (101) and an outlet cavity (102) which is positioned on one side of the cylindrical valve cavity (101) and is connected with the cylindrical valve cavity (101), two ends of the cylindrical valve cavity (101) are provided with openings, the valve body (1) is respectively connected with an inlet end cover (7) and a valve cover (2) at two ends of the cylindrical valve cavity (101), and an inlet cavity (701) is arranged in the inlet end cover (7);

the valve core (6) is of a cylindrical plunger structure matched with the cylindrical valve cavity (101), the valve core (6) is arranged in the cylindrical valve cavity (101) and can be rotatably arranged relative to the valve body (1), and two ends of the valve core (6) respectively abut against the inlet end cover (7) and the valve cover (2); one end, close to the valve cover (2), of the valve core (6) is provided with a linkage hole (601) matched with the valve rod (5) in a circumferential linkage mode, one end, far away from the valve cover (2), of the valve core (6) is provided with a valve core inlet (602) communicated with the inlet cavity (701), a valve core cavity (603) is arranged in the valve core (6), the side wall of the valve core (6) is provided with a valve core outlet (604), the valve core outlet (604) is arranged corresponding to the outlet cavity (102), and 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 (;

a valve seat (8) is fixed in the outlet cavity (102), and a valve seat sealing end face (801) in sealing fit with the cylindrical revolution surface of the valve core (6) is arranged on the valve seat (8).

2. The ultra-low temperature high pressure angle type pressure balanced plunger regulator valve of claim 1, wherein: the outlet cavity (102) is cylindrical, and the central axis of the outlet cavity (102) is perpendicular to the central axis of the cylindrical valve cavity (101).

3. The ultra-low temperature high pressure angle type pressure balanced plunger regulator valve of claim 2, wherein: the outer side of the valve seat (8) is provided with a fixing sleeve (10) connected with the valve body (1), an elastic part (11) is arranged between the valve seat (8) and the fixing sleeve (10), and under the action of the elastic part (11), the sealing end face (801) of the valve seat is in sealing contact with the cylindrical revolution surface of the valve core (6).

4. The ultra-low temperature high pressure angle type pressure balanced plunger regulator valve of claim 3, wherein: the elastic piece (11) is a compression spring and is provided with a plurality of elastic pieces which are arranged at equal intervals along the circumference; the fixed sleeve (10) is matched with the inner wall of the valve body (1) by adopting a thread structure, and the elasticity of the elastic part (11) can be adjusted by rotating the fixed sleeve (10).

5. The ultra-low temperature high pressure angle type pressure balanced plunger regulator valve according to any one of claims 1 to 4, wherein: the periphery of the valve seat (8) is provided with a sealing ring groove (802), a single sealing energy storage ring (12) is arranged in the sealing ring groove (802), and the sealing end of the single sealing energy storage ring (12) is arranged towards the direction of the valve core (6).

6. The ultra-low temperature high pressure angle type pressure balanced plunger regulator valve of claim 5, wherein: the valve seat (8) is formed by combining a first valve seat piece (803) and a second valve seat piece (804), a valve seat sealing end face (801) is arranged on the end face, far away from the second valve seat piece (804), of the first valve seat piece (803), the periphery of the first valve seat piece (803) is close to the end face, far away from the second valve seat piece (804), of the second valve seat piece (804) in a slotted mode to form a sealing ring groove (802), a protruding ring portion (805) is formed in the end portion of the second valve seat piece (804) in a protruding mode, and the protruding ring portion (805) stretches into the sealing ring groove (802) to form a positioning effect on the single sealing.

7. The ultra-low temperature high pressure angle type pressure balanced plunger regulator valve of claim 1, wherein: the valve core inlet (602) and the valve core cavity (603) are formed by inwards forming a cylindrical groove coaxial with the valve core (6) at one end of the valve core (6) far away from the valve cover (2); the inner diameter of the valve core inlet (602) is larger than that of the valve core inlet (602).

8. The ultra-low temperature high pressure angle type pressure balanced plunger regulator valve of claim 1, wherein: 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 which is in sealing fit with the valve seat sealing end surface (801), and other parts of the valve core (6) which are convex relative to the annular groove (605) are attached to the inner wall of the cylindrical valve cavity (101); and hard sealing coatings are sprayed on the sealing end face (801) of the valve seat and the surface of the sealing face of the valve core.

9. The ultra-low temperature high pressure angle type pressure balanced plunger regulator valve of claim 1, wherein: and one end of the inlet end cover (7) abutted to the valve core (6) is provided with a positioning groove (702), and one end of the valve core (6) abutted to the inlet end cover (7) is provided with a positioning convex ring (606) matched with the positioning groove (702).

10. The ultra-low temperature high pressure angle type pressure balanced plunger regulator valve of claim 1, wherein: the lengthened support (3) is provided with a water dropping plate (13), and a plurality of arc moon-shaped heat dissipation grooves (301) are arranged between the water dropping plate (13) and the valve cover (2).