Novel low-inlet high-outlet high-temperature high-pressure stop check valve

Abstract

The novel low-inlet high-outlet high-temperature high-pressure stop check valve comprises a valve body structure, an inlet connecting part is arranged on one side of the valve body structure, an outlet connecting part is arranged on the other side of the valve body structure, a separation part is arranged in the valve body structure, and the separation part separates the inlet connecting part and the outlet connecting part. The valve body structure comprises an inlet connecting part and an outlet connecting part, a partition part is arranged at the top end of the valve body structure, a vertically-penetrating through hole is formed in the middle of the partition part, the inlet connecting part and the outlet connecting part are communicated through the through hole, an opening and closing connecting part is arranged at the top end of the valve body structure, a valve cover driving device is detachably installed through the opening and closing connecting part, and a valve rod is driven by the valve cover driving device. A valve clack is detachably installed at the lower end of the valve rod, the structure of the device is more optimized, and the maintainability is high.

Description

Technical Field

[0001] The invention relates to a novel low-inlet and high-outlet high-temperature and high-pressure stop check valve. Background Art

[0002] With the improvement of petrochemical plant performance, conventional stop valves are increasingly unable to meet the industry's requirements for high temperature and high pressure conditions.

[0003] The valve stem of the stop valve moves downward, and the pressure when pressing the valve disc against the valve seat to form a forced seal needs to be large enough, especially for low-inlet and high-outlet high-pressure stop valves with a nominal pressure of 15MPa. The material of the valve disc is generally the same as that of the valve body, and the valve stem material is generally 13Cr stainless steel. If the valve stem acts directly on the valve disc, after long-term use, the valve disc will be pushed out of a pit by the valve stem, which will seriously affect the performance of the valve.

[0004] Secondly, the valve seat is under pressure after contacting the valve disc. When the pressure-bearing surface is deformed, the sealing performance of the entire stop valve will be reduced, and this deformation cannot be repaired, resulting in the scrapping of the entire stop valve.

[0005] Based on the above problems, we designed a new type of low-inlet, high-outlet, high-temperature and high-pressure stop check valve with a more optimized structure and higher maintainability. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a new type of low-inlet, high-outlet, high-temperature and high-pressure stop check valve with a more optimized structure and higher maintainability.

[0007] To solve the above problems, the present invention adopts the following technical solutions:

[0008] A novel low-inlet and high-outlet high-temperature and high-pressure stop check valve comprises a valve body structure, wherein an inlet connection portion is arranged on one side of the valve body structure, and an outlet connection portion is arranged on the other side, a partition portion is arranged inside the valve body structure, the partition portion separates the inlet connection portion and the outlet connection portion, a vertically penetrating conducting hole is arranged in the middle of the partition portion, the conducting hole conducts the inlet connection portion and the outlet connection portion, an opening and closing connection portion is arranged at the top end of the valve body structure, and a valve cover drive is detachably mounted through the opening and closing connection portion A driving device is provided, wherein a valve stem is driven by the valve cover driving device, a valve flap is detachably mounted on the lower end of the valve stem, and a valve seat is detachably mounted on the orifice of the conducting hole, after the valve stem moves downward, the valve flap cooperates with the valve seat to form a seal and blocks the conducting hole, after the valve stem moves upward, the valve flap is separated from the valve seat, and the conducting hole is opened at this time, after the valve cover driving device is opened upward, the valve flap is taken out from the opening and closing connection part, and a pressure block supporting the valve stem is arranged inside the valve flap.

[0009] Preferably, the conducting hole is a stepped hole, which includes a first large diameter portion, a second large diameter portion, a small diameter portion and a third large diameter portion, the first large diameter portion, the second large diameter portion, the small diameter portion and the third large diameter portion are arranged in sequence from top to bottom, the diameter of the second large diameter portion is smaller than the diameter of the first large diameter portion, the inner walls of the first large diameter portion and the third large diameter portion are processed with internal threads, the outside of the valve seat is processed with a right-angle groove, the valve seat is threadedly connected to the first large diameter portion, the right-angle groove fits the stepped surface formed by the first large diameter portion and the second large neck portion; a retaining ring is cooperated through the third large diameter portion, and a sealing ring is assembled at the small diameter portion, the sealing ring is clamped by the valve seat and the retaining ring, and the sealing ring is sealed between the valve seat, the small diameter portion and the retaining ring.

[0010] Preferably, a valve flap guide seat is provided at the axis center of the retaining ring, a valve flap guide rod is provided at the bottom axis center of the valve plate, the valve flap guide rod slides axially along the valve flap guide seat, and a connecting rod is provided between the retaining ring and the valve flap guide seat.

[0011] Preferably, the valve cover driving device includes a valve cover, and a tube portion integrally formed on the upper part of the valve cover, the valve stem axially passes through the tube portion, a stepped hole is processed in the tube portion, the sealing filler is arranged on the stepped surface of the stepped hole, and the sealing filler forms a seal between the tube portion and the valve stem; a pressing tube for pressing the sealing filler is downwardly mounted on the top of the tube portion, a first flange is arranged on the outer wall of the tube portion, a second flange is arranged on the top of the pressing tube, and a pressing rod assembly is installed between the first flange and the second flange, and the pressing rod assembly drives the pressing tube to move downward after being tightened, and the pressing tube squeezes the pressing filler after it moves downward. The sealing packing is described, and an internal threaded hole is processed inside the valve stem, and the internal threaded hole penetrates the valve stem upwardly; an axle seat is arranged above the tube portion, and a bracket is arranged between the axle seat and the tube portion, and a driving rod is rotatably engaged with the axle seat, and a bearing is engaged between the driving rod and the axle seat, and a screw is arranged at the lower part of the driving rod, and the screw is engaged with the internal threaded hole, and a guide is arranged at the position where the valve stem is exposed above the tube portion, and the guide is fixed to the valve stem, and the guide slides vertically along the bracket, and under the restriction of the guide, the valve stem slides axially, and a handle is installed on the outer wall of the driving rod.

[0012] Preferably, more than two sealing fillers are provided, and an elastic sealing device is provided between two adjacent sealing fillers.

[0013] Preferably, the elastic sealing device includes a lower ring body and an upper ring body, the top of the lower ring body is provided with a first convex ring, the bottom of the upper ring body is provided with a second convex ring corresponding to the first convex ring, an inner sealing ring and an outer sealing ring are matched between the lower ring body and the upper ring body, the inner sealing ring and the outer sealing ring are separated by the first convex ring and the second convex ring, under the support of the inner sealing ring and the outer sealing ring, the first convex ring and the second convex ring are separated, and the lower ring body and the upper ring body are squeezed after the upper and lower sealing fillers are pressurized, so that the inner sealing ring forms an interference fit with the valve stem after elastic deformation, and the outer sealing ring forms an interference fit with the stepped hole after elastic deformation.

[0014] Preferably, a plurality of guide needles are provided in an annular shape on the top of the first convex ring, and needle holes matching the guide needles are provided on the bottom of the second convex ring.

[0015] Preferably, the guide comprises a sliding tube, a fork rod is provided at the outer wall of the sliding tube, a fork groove is provided at the end of the fork rod, the bracket is fitted in the fork groove, and the sliding tube is fixed to the valve stem.

[0016] Preferably, the pressure rod assembly includes a pressure rod, the upper end of which is provided with a connecting seat, the lower end of which passes through the first flange and is fitted with a limiting nut, a spring is sleeved on the pressure rod, the spring acts between the limiting nut and the first flange, a connecting rod is fitted through the connecting seat, the connecting rod has a first external threaded portion that matches the connecting seat, a second external threaded portion is provided on the rod wall of the connecting rod, the upper end of the connecting rod passes through the second flange and is fitted with a clamping nut, and the thread rotation directions of the first external threaded portion and the second external threaded portion are opposite.

[0017] Preferably, the pressure tube has an inner hole, which is also a stepped hole. The valve stem passes through the axis of the inner hole. A tube cover is threadedly connected at the orifice of the inner hole. A sealing ring is provided on the inner wall of the tube cover. The sealing ring forms a seal with the valve stem. A vertically penetrating observation hole is provided on the top of the valve cover.

[0018] The beneficial effects of the present invention are:

[0019] Advantage 1: This device has a pressure block inside the valve disc. The pressure block bears the thrust of the valve stem, allowing the valve disc to receive indirect force, which can reduce the deformation of the valve disc caused by the valve stem. Even if the pressure block is deformed, it can be repaired by replacement.

[0020] Advantage 2: The valve seat in the device is replaceable. After being worn or deformed, it can be taken out and replaced to ensure adequate sealing, thereby increasing the maintainability of the device and reducing the cost of use.

[0021] Advantage three: in this device, the vertical displacement of the valve stem can be effectively sealed to avoid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a partial cross-sectional view of the present invention;

[0025] Figure 3 This is the enlarged view of point A;

[0026] Figure 4 is a top view of the retaining ring;

[0027] Figure 5 It is the front view of the valve cover driving device;

[0028] Figure 6 It is a half-section view of the valve cover driving device;

[0029] Figure 7 is a cross-sectional view of the elastic sealing device;

[0030] Figure 8 is a top view of the guide;

[0031] Fig. 9 is a structural schematic diagram of a compression rod assembly;

[0032] Fig.10 This is an enlarged view of point B. DETAILED DESCRIPTION

[0033] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0034] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0035] In the description of the present invention, it is necessary to understand that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, in the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "disposed", "socketed", "connected", "through", "plugged" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] See also Figure 1 and Figure 2 A novel low-inlet-high-outlet high-temperature-high-pressure stop check valve shown in the figure comprises a valve body structure 1, wherein an inlet connection portion 101 is provided on one side of the valve body structure 1, and an outlet connection portion 102 is provided on the other side, and a partition portion 2 is provided in the valve body structure 1, wherein the valve body structure 1, the inlet connection portion 101, the outlet connection portion 102 and the partition portion 2 are a cast-integrated structure, wherein the partition portion 2 separates the inlet connection portion 101 and the outlet connection portion 102, wherein a vertically penetrating conducting hole 201 is provided in the middle of the partition portion 2, wherein the conducting hole 201 conducts the inlet connection portion 101 and the outlet connection portion 102, and an opening and closing connection portion 103 is provided at the top end of the valve body structure 1 A valve cover driving device 3 is detachably mounted through the opening and closing connection part 103, and a valve stem 4 is driven by the valve cover driving device 3. A valve flap 5 is detachably mounted on the lower end of the valve stem 4, and a valve seat 6 is detachably mounted at the orifice of the guide hole 201. After the valve stem 4 moves downward, the valve flap 5 cooperates with the valve seat 6 to form a seal and block the guide hole 201. After the valve stem 4 moves upward, the valve flap 5 is separated from the valve seat 6, and the guide hole 201 is opened at this time. After the valve cover driving device 3 is opened upward, the valve flap 5 is taken out from the opening and closing connection part 103, and a pressure block 599 supporting the valve stem 4 is provided inside the valve flap 5.

[0039] In the above technical solution, the valve stem 4 is driven upward or downward by the valve cover driving device 3. When the valve stem 4 moves downward, the valve flap 5 cooperates with the valve seat 6 to complete the blocking of the inlet connection part 101 and the outlet connection part 102, and the valve body structure 1 is in a disconnected state. When the valve stem 4 moves upward, the valve flap 5 is separated from the valve seat 6. At this time, the liquid flows in from the inlet connection part 101 and flows out from the outlet connection part 102, and the valve body structure 1 is in a passage state.

[0040] In the above technical solution, the valve cover drive device 3 can be removed together with the valve stem 4 and the valve flap 5. The valve flap 5 and the valve stem 4 are detachable structures. The valve stem 4 is inserted into the valve flap 5 and acts on the pressure block 599. The pressure block 599 is in contact with the plane of the valve flap 5, which disperses the force when the valve stem 4 is pressed down and reduces the pressure deformation of the valve flap 5.

[0041] In the above technical solution, after the valve cover driving device 3 is removed, the valve seat 6 can be dismantled to facilitate replacement of the valve seat 6 to ensure sealing.

[0042] See also Figure 3 As shown, the conducting hole 201 is a stepped hole, which includes a first large diameter portion 211, a second large diameter portion 212, a small diameter portion 213 and a third large diameter portion 214. The first large diameter portion 211, the second large diameter portion 212, the small diameter portion 213 and the third large diameter portion 214 are arranged in sequence from top to bottom. The diameter of the second large diameter portion 212 is smaller than the diameter of the first large diameter portion 211. The inner walls of the first large diameter portion 211 and the third large diameter portion 214 are processed with internal threads. The valve seat 6 A right-angle groove 61 is processed on the outside, and the valve seat 6 is threadedly connected to the first large diameter part 211, and the right-angle groove 61 fits the step surface formed by the first large diameter part 211 and the second large neck part 212; a retaining ring 215 is matched through the third large diameter part 214, and a sealing ring 216 is installed at the small diameter part 213, and the sealing ring 216 is clamped by the valve seat 6 and the retaining ring 215, and the sealing ring 216 is sealed between the valve seat 6, the small diameter part 213 and the retaining ring 215.

[0043] In the above technical solution, a specially designed conducting hole 201 is used so that the valve seat 6 and the retaining ring 215 form an extrusion pressure on the sealing ring 216 after assembly, so that the sealing ring 216 forms a seal between the valve seat 6, the retaining ring 215 and the conducting hole 201, thereby avoiding liquid seepage at the matching position of the valve seat 6 and the conducting hole 201.

[0044] See also Figure 2 and Figure 4As shown, a valve flap guide seat 221 is provided at the axis center of the retaining ring 215, and a valve flap guide rod 551 is provided at the bottom axis center of the valve plate 5. The valve flap guide rod 551 slides axially along the valve flap guide seat 221, and a connecting rod 222 is provided between the retaining ring 215 and the valve flap guide seat 221.

[0045] The valve disc 4 is forged, and the valve disc guide rod and the valve disc can be integrally forged or welded. After integral processing, the valve disc guide rod and the valve disc guide seat 221 are matched with a tolerance of H7 / d7. The surface hardness of the valve disc guide seat must be HB50 or higher than the surface hardness of the valve disc guide rod matched therewith. Overall hardening or ENP or hard chrome plating can be selected, and the surface finish must reach Ra0.8 or above.

[0046] In the above technical solution, the valve flap and the valve stem 4 are designed to be separable, and the valve flap is guided for displacement by the valve flap guide rod. Under normal circumstances, there is always liquid pressure below the valve flap 5. After the valve stem 4 moves upward, the valve flap 5 moves upward with it under the push of the liquid pressure. The directional displacement of the valve flap 5 is guaranteed by the valve flap guide rod. When the valve flap 5 needs to be closed, the valve flap 5 is pressed down by the downward movement of the valve stem 4 to complete the blocking.

[0047] See also Figure 5 and Figure 6As shown, the valve cover driving device 3 includes a valve cover 31, and a tube portion 32 integrally formed on the upper part of the valve cover 31, the valve stem 4 axially passes through the tube portion 32, a stepped hole 321 is processed in the tube portion 32, and the sealing packing 33 is arranged on the stepped surface of the stepped hole 321, and the sealing packing 33 forms a seal between the tube portion 32 and the valve stem 4; a pressing tube 34 for pressing the sealing packing 33 is downwardly assembled at the top of the tube portion 32, a first flange 35 is arranged at the outer wall of the tube portion 32, a second flange 36 is arranged at the top of the pressing tube 34, and a pressing rod assembly 8 is installed between the first flange 35 and the second flange 36, and the pressing rod assembly 8 drives the pressing tube 34 to move downward after being tightened, and the pressing tube 34 squeezes the sealing packing after moving downward. Material 33, an internal threaded hole 41 is processed inside the valve stem 4, and the internal threaded hole 41 penetrates the valve stem 4 upwardly, and an axle seat 37 is arranged above the tube portion 32, and a bracket 38 is arranged between the axle seat 37 and the tube portion 32, and a driving rod 39 is rotatably engaged with the axle seat 37, and a bearing is engaged between the driving rod 39 and the axle seat 37, and a screw 310 is arranged at the lower part of the driving rod 39, and the screw 310 is engaged with the internal threaded hole 41, and a guide 10 is arranged at the position where the valve stem 4 is exposed above the tube portion 32, and the guide 10 is fixed to the valve stem 4, and the guide 10 slides vertically along the bracket 38, and under the restriction of the guide 10, the valve stem 4 slides axially, and a handle 311 is installed on the outer wall of the driving rod 39.

[0048] In the above technical solution, the surface of the valve stem 4 is smooth, and the valve stem 4 is displaced along the axial direction of the tube 32 to complete the opening or closing of the valve flap 5. The sliding of the valve stem 4 is driven by the rotation of the screw 310. The valve stem 4 is guided by an external guide 10. There is no need to perform special external processing on the valve stem 4 to ensure the smoothness of the outer wall of the valve stem 4. The valve stem 4 is sealed by the sealing packing 33 during the upward and downward movement, so that when the valve flap 5 is opened, it can prevent the liquid from flowing out along the valve stem 4.

[0049] See also Figure 6 As shown, more than two sealing fillers 33 are provided, and an elastic sealing device 7 is provided between two adjacent sealing fillers 33 .

[0050] In the above technical solution, more than two sealing fillers 33 are used to improve the sealing performance.

[0051] At the same time, by utilizing the squeezing force when squeezing the sealing filler 33, the elastic sealing device 7 can be further pressurized during the subsequent pressurization, thereby further improving the sealing performance.

[0052] See also Figure 6 and Figure 7 As shown, the elastic sealing device 7 includes a lower ring body 71 and an upper ring body 72, the top of the lower ring body 71 is provided with a first convex ring 710, the bottom of the upper ring body 72 is provided with a second convex ring 720 corresponding to the first convex ring 710, an inner sealing ring 73 and an outer sealing ring 74 are matched between the lower ring body 71 and the upper ring body 72, the inner sealing ring 73 and the outer sealing ring 74 are separated by the first convex ring 710 and the second convex ring 720, under the support of the inner sealing ring 73 and the outer sealing ring 74, the first convex ring 710 and the second convex ring 720 are separated, and the lower ring body 71 and the upper ring body 72 are squeezed after the upper and lower sealing fillers 33 are pressurized, so that the inner sealing ring 73 forms an interference fit with the valve stem 4 after elastic deformation, and the outer sealing ring 74 forms an interference fit with the stepped hole 321 after elastic deformation.

[0053] In the above technical solution, the lower ring body 71 and the upper ring body 72 are matched. This split matching form can adapt to the inner sealing ring 73 and the outer sealing ring 74 of different vertical heights.

[0054] The separated inner sealing ring 73 and outer sealing ring 74 are designed. Compared with the integral sealing ring, this separate design can reduce the thickness of a single sealing ring to facilitate better elastic deformation.

[0055] Furthermore, in actual application, only the valve stem 4 is in an axial movement state, that is, only the inner wall of the inner sealing ring 73 is subject to wear, and the inner sealing ring 73 can be replaced alone during replacement at a later time.

[0056] See also Figure 7 As shown, a plurality of guide pins 771 are provided in an annular shape at the top of the first convex ring 710 , and a needle hole 772 matching the guide pins 771 is provided at the bottom of the second convex ring 720 .

[0057] The above technology plays a guiding role to ensure the coaxiality of the lower ring body 71 and the upper ring body 72.

[0058] See also Figure 5 and Figure 8 As shown, the guide 10 includes a sliding tube 1010, a fork rod 1011 is provided at the outer wall of the sliding tube 1010, a fork groove 1012 is provided at the end of the fork rod 1011, the bracket 38 is fitted in the fork groove 1012, and the sliding tube 1010 is fixed to the valve stem 4.

[0059] This technical solution is mainly to guide the movement of the valve stem 4 to prevent the valve stem 4 from rotating with the screw.

[0060] See also Fig. 9As shown, the pressure rod assembly 8 includes a pressure rod 81, and a connecting seat 82 is provided at the upper end of the pressure rod 81. The lower end of the pressure rod 81 passes through the first flange 35 and is engaged with a limiting nut 83. A spring 84 is sleeved on the pressure rod 81, and the spring 84 acts between the limiting nut 83 and the first flange 35. A connecting rod 85 is engaged through the connecting seat 82. The connecting rod 85 has a first external threaded portion 851 that matches the connecting seat 82, and a second external threaded portion 852 is provided on the rod wall of the connecting rod 85. The upper end of the connecting rod 85 passes through the second flange 36 and is engaged with a clamping nut 86. The thread rotation directions of the first external threaded portion 851 and the second external threaded portion 852 are opposite.

[0061] In the above technical solution, a certain anti-loosening effect can be achieved by the first external thread part 851 and the second external thread part 852 having opposite rotation directions.

[0062] In the above technical solution, the connecting rod 85 can be changed in height along the connecting seat 82, and the clamping nut 86 can be changed in position along the connecting rod 85, so that the clamping range of the second flange 36 can be adjusted to be larger and easier to assemble.

[0063] By providing the spring 84 , a preload force can be provided.

[0064] See also Fig.10 As shown, the pressure tube 34 has an inner hole 341, and the inner hole 341 is also a stepped hole. The valve stem 4 passes through the axis of the inner hole 341. A pipe cover 342 is threadedly connected at the orifice position of the inner hole 341. A sealing ring 343 is provided on the inner wall of the pipe cover 342. The sealing ring 343 forms a seal with the valve stem 4. A vertical observation hole 344 is provided on the top of the valve cover 342.

[0065] In this technical solution, the oil seeping along the valve stem 4 can be accumulated through the inner hole 341 , and whether the oil remains in the inner hole 341 can be observed through the observation hole 344 to determine whether the seal of the valve stem 4 fails.

[0066] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A new type of low inlet and high outlet high temperature and high pressure stop check valve, characterized by: The invention comprises a valve body structure (1), wherein an inlet connection portion (101) is arranged on one side of the valve body structure (1), and an outlet connection portion (102) is arranged on the other side; a partition portion (2) is arranged inside the valve body structure (1), and the partition portion (2) separates the inlet connection portion (101) and the outlet connection portion (102); a vertically penetrating through-hole (201) is arranged in the middle of the partition portion (2), and the through-hole (201) conducts the inlet connection portion (101) and the outlet connection portion (102); an opening and closing connection portion (103) is arranged at the top end of the valve body structure (1), and a valve cover driving device (3) is detachably mounted through the opening and closing connection portion (103), and a valve cover driving device (3) is arranged through the opening and closing connection portion (103). A valve stem (4) is driven by the valve cover driving device (3), and a valve flap (5) is detachably mounted on the lower end of the valve stem (4), and a valve seat (6) is detachably mounted at the orifice of the guide hole (201). After the valve stem (4) moves downward, the valve flap (5) cooperates with the valve seat (6) to form a seal and block the guide hole (201). After the valve stem (4) moves upward, the valve flap (5) is separated from the valve seat (6), and the guide hole (201) is opened at this time. After the valve cover driving device (3) is opened upward, the valve flap (5) is taken out from the opening and closing connection part (103), and a pressure block 599 is provided inside the valve flap 5 to support the valve stem 4.

2. The new type of low inlet and high outlet high temperature and high pressure stop check valve according to claim 1 is characterized in that: The conducting hole (201) is a stepped hole, comprising a first large diameter portion (211), a second large diameter portion (212), a small diameter portion (213) and a third large diameter portion (214); the first large diameter portion (211), the second large diameter portion (212), the small diameter portion (213) and the third large diameter portion (214) are arranged in sequence from top to bottom; the diameter of the second large diameter portion (212) is smaller than the diameter of the first large diameter portion (211); the inner walls of the first large diameter portion (211) and the third large diameter portion (214) are processed with internal threads; the outer wall of the valve seat (6) is processed with A right-angle groove (61), the valve seat (6) is threadedly connected to the first large diameter portion (211), and the right-angle groove (61) fits the stepped surface formed by the first large diameter portion (211) and the second large neck portion (212); a retaining ring (215) is matched through the third large diameter portion (214), and a sealing ring (216) is installed at the small diameter portion (213), the sealing ring (216) is clamped by the valve seat (6) and the retaining ring (215), and the sealing ring (216) is sealed between the valve seat (6), the small diameter portion (213) and the retaining ring (215).

3. The new type of low inlet and high outlet high temperature and high pressure stop check valve according to claim 2 is characterized by: A valve disc guide seat (221) is arranged at the axis center of the retaining ring (215), and a valve disc guide rod (551) is arranged at the bottom axis center of the valve plate (5). The valve disc guide rod (551) slides axially along the valve disc guide seat (221), and a connecting rod (222) is arranged between the retaining ring (215) and the valve disc guide seat (221).

4. The new type of low inlet and high outlet high temperature and high pressure stop check valve according to claim 1 is characterized in that: The valve cover driving device (3) comprises a valve cover (31), and a tube portion (32) integrally formed on the upper portion of the valve cover (31), the valve stem (4) axially passes through the tube portion (32), a stepped hole (321) is formed in the tube portion (32), the sealing packing (33) is arranged on the stepped surface of the stepped hole (321), and the sealing packing (33) forms a seal between the tube portion (32) and the valve stem (4); A pressing tube (34) for pressing the sealing filler (33) is installed downwardly from the top, a first flange (35) is arranged on the outer wall of the tube portion (32), a second flange (36) is arranged on the top of the pressing tube (34), a pressing rod assembly (8) is installed between the first flange (35) and the second flange (36), and the pressing rod assembly (8) drives the pressing tube (34) to move downward after being tightened, and the pressing tube (34) squeezes the sealing filler (33) after moving downward. ), the valve stem (4) is internally processed with an internal threaded hole (41), the internal threaded hole (41) passes through the valve stem (4) upward, an axle seat (37) is arranged above the tube (32), a bracket (38) is arranged between the axle seat (37) and the tube (32), a driving rod (39) is rotatably engaged through the axle seat (37), a bearing is engaged between the driving rod (39) and the axle seat (37), and a bearing is arranged at the bottom of the driving rod (39) A screw rod (310) is provided, wherein the screw rod (310) cooperates with the internal threaded hole (41); a guide (10) is provided at a position where the valve stem (4) is exposed above the tube portion (32); the guide (10) is fixed to the valve stem (4); the guide (10) slides vertically along the bracket (38); under the restriction of the guide (10), the valve stem (4) slides axially; a handle (311) is installed on the outer wall of the driving rod (39).

5. The novel low-inlet and high-outlet high-temperature and high-pressure stop check valve according to claim 4 is characterized in that: More than two sealing fillers (33) are provided, and an elastic sealing device (7) is provided between two adjacent sealing fillers (33).

6. The novel low-inlet and high-outlet high-temperature and high-pressure stop check valve according to claim 5 is characterized in that: The elastic sealing device (7) comprises a lower ring body (71) and an upper ring body (72); a first convex ring (710) is arranged on the top of the lower ring body (71); a second convex ring (720) corresponding to the first convex ring (710) is arranged on the bottom of the upper ring body (72); an inner sealing ring (73) and an outer sealing ring (74) are matched between the lower ring body (71) and the upper ring body (72); the inner sealing ring (73) and the outer sealing ring (74) are connected by the first convex ring (710) and the second convex ring (720). The first convex ring (710) and the second convex ring (720) are separated by a convex ring (720). Under the support of the inner sealing ring (73) and the outer sealing ring (74), the first convex ring (710) and the second convex ring (720) are separated. After the upper and lower sealing fillers (33) are compressed, the lower ring body (71) and the upper ring body (72) are squeezed, so that the inner sealing ring (73) forms an interference fit with the valve stem (4) after elastic deformation, and the outer sealing ring (74) forms an interference fit with the stepped hole (321) after elastic deformation.

7. The novel low-inlet and high-outlet high-temperature and high-pressure stop check valve according to claim 6 is characterized in that: The top of the first convex ring (710) is provided with a plurality of guide pins (771) in a ring shape, and the bottom of the second convex ring (720) is provided with pinholes (772) matching the guide pins (771).

8. The novel low-inlet and high-outlet high-temperature and high-pressure stop check valve according to claim 4 is characterized in that: The guide (10) includes a sliding tube (1010), a fork rod (1011) is provided at the outer wall of the sliding tube (1010), a fork groove (1012) is provided at the end of the fork rod (1011), the bracket (38) is fitted in the fork groove (1012), and the sliding tube (1010) is fixed to the valve stem (4).

9. The novel low-inlet and high-outlet high-temperature and high-pressure stop check valve according to claim 4 is characterized in that: The pressure rod assembly (8) includes a pressure rod (81), the upper end of the pressure rod (81) is provided with a connecting seat (82), the lower end of the pressure rod (81) passes through the first flange (35) and is matched with a limit nut (83), a spring (84) is sleeved on the pressure rod (81), the spring (84) acts between the limit nut (83) and the first flange (35), a connecting rod (85) is matched through the connecting seat (82), the connecting rod (85) has a first external threaded portion (851) matched with the connecting seat (82), a second external threaded portion (852) is provided on the rod wall of the connecting rod (85), the upper end of the connecting rod (85) passes through the second flange (36) and is matched with a clamping nut (86), and the first external threaded portion (851) and the second external threaded portion (852) have opposite thread rotation directions.

10. The novel low-inlet and high-outlet high-temperature and high-pressure stop check valve according to claim 4 is characterized in that: The pressure tube (34) has an inner hole (341), and the inner hole (341) is also a stepped hole. The valve stem (4) passes through the axis of the inner hole (341). A tube cover (342) is threadedly connected at the orifice of the inner hole (341). A sealing ring (343) is provided on the inner wall of the tube cover (342). The sealing ring (343) forms a seal with the valve stem (4). A vertically penetrating observation hole (344) is provided on the top of the valve cover (342).

Images