Stop valve capable of shunting and reducing pressure

Abstract

The invention relates to the technical field of valves, in particular to a stop valve capable of shunting and reducing pressure, which comprises a valve body, a valve clack, a valve seat, a valve rod, a valve cover and a driving mechanism, a shunting piece is arranged on the valve clack in the direction towards the inlet end, and at least two stop blocks are arranged on the outer wall of the shunting piece along the circumferential direction in a protruding manner; the check blocks are in contact with the inner wall of the valve seat to form sliding fit, a flow dividing groove is formed between every two adjacent check blocks, the check blocks are sleeved with the first sealing rings at the same time, and when the valve clack is in sealing fit with the valve seat, the first sealing rings abut against the inner wall of the valve seat to form sealing fit. Pressure reduction is carried out in a medium shunting mode, and the valve has the advantages that the medium is prevented from impacting valve parts, and closing is more labor-saving.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a shut-off valve capable of diverting and reducing pressure. Background Technology

[0002] Gate valves, also known as stop valves, are among the most widely used types of valves. Their popularity stems from the low friction between the sealing surfaces during opening and closing, resulting in durability. They also have a small opening height, are easy to manufacture and maintain, and are suitable for both low and medium pressures as well as high pressures. Valves play a crucial role in cutting off and throttling the medium in their respective pipelines. As a vital shut-off valve, the gate valve's sealing mechanism involves applying torque to the valve stem, which in turn applies pressure axially to the valve disc, ensuring a tight seal between the valve disc's sealing surface and the valve seat's sealing surface, preventing leakage of the medium along the gaps between the sealing surfaces.

[0003] When existing gate valves are used on high-pressure pipelines, high-pressure media will flow through the inlet. When the valve is opened to allow the media to flow, the media will still be in a high-pressure state and rush towards the outlet. Furthermore, the high-pressure media will also impact the valve disc, valve body, and other valve components, which can easily cause damage to the valve components. Moreover, more force is required when closing the valve disc. Therefore, the opening and closing of the gate valve are affected by the high-pressure media. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a flow-diverting and pressure-reducing shut-off valve. This invention reduces pressure by diverting the medium, and has the advantages of preventing medium from impacting valve components and making closing easier.

[0005] The technical solution adopted in this invention is as follows: A flow-diverting and pressure-reducing shut-off valve includes a valve body, a valve disc, a valve seat, a valve stem, a valve cover, and a drive mechanism. The valve disc and valve seat are both disposed inside the valve body. The valve body is divided into an inlet end and an outlet end by the valve disc and valve seat sealingly engaging. The valve cover is disposed at one end of the valve body. One end of the valve stem is connected to the valve disc, and the other end passes through the valve cover and is connected to the drive mechanism. A flow-diverting element is disposed on the valve disc facing the inlet end. At least two blocks protrude circumferentially on the outer wall of the flow-diverting element. Each block contacts the inner wall of the valve seat to form a sliding fit. A flow-diverting groove is formed between every two adjacent blocks. The valve also includes a first sealing ring that is simultaneously sleeved on the outside of each block. When the valve disc and valve seat are sealingly engaged, the first sealing ring abuts against the inner wall of the valve seat to form a sealing fit.

[0006] Each of the baffles extends a return wall to both sides from the end away from the diverter. The outer wall of the return wall also forms a sliding fit with the inner wall of the valve seat, and a return groove is formed between the inner wall of the return wall and the outer wall of the diverter. The cross-section of the baffle is T-shaped.

[0007] Each of the aforementioned blocks has a pressure-reducing channel running through it, and the pressure-reducing channel connects two adjacent diversion channels.

[0008] The pressure relief channel includes a pressure relief main channel and several pressure relief holes. The pressure relief main channel extends along the axial direction of the valve stem. The several pressure relief holes are evenly distributed on both sides of the pressure relief main channel. The inner diameter of the pressure relief holes closer to the valve disc is smaller than that of the pressure relief holes farther from the valve disc. Each pressure relief hole is inclinedly connected to the pressure relief main channel.

[0009] The pressure relief channel also includes a pressure relief auxiliary channel that is perpendicular to the pressure relief main channel. The inner diameter of the pressure relief auxiliary channel is larger than that of the pressure relief hole, and the pressure relief auxiliary channel is located between the pressure relief hole and the valve disc.

[0010] The valve disc is also provided with a connecting post for the outer sleeve of the diverter at one end corresponding to the inlet end. The outer wall of the connecting post near the valve disc is provided with an external thread section. The inner wall of the diverter is provided with an internal thread section that is threaded to the external thread section. A second sealing ring is also provided between the diverter and the connecting post.

[0011] The valve disc has a first arc-shaped drainage surface recessed on the end face near the inlet, and the diverter has a second arc-shaped drainage surface recessed on the end face near the inlet.

[0012] The end face of the connecting column near the inlet end is recessed with a third arc-shaped drainage surface, which is connected to the second arc-shaped drainage surface to form a coplanar surface.

[0013] A rotating part extends from the connecting column, and a rotating groove is provided on the valve disc for the rotating part to extend into. A gap is left between the inner wall of the rotating groove and the rotating part. The valve disc is also connected to a retaining ring by a fastener. The retaining ring limits the rotating part to the rotating groove. The fastener passes through the valve disc and connects to the retaining ring along the end face of the valve disc near the valve stem.

[0014] A bearing is also provided between the rotating part and the valve disc. The outer side of the bearing abuts against the valve disc and the inner side abuts against the rotating part. A third sealing ring is provided between the retaining ring and the connecting column.

[0015] The beneficial effects of this invention are as follows: This invention reduces pressure by diverting the medium, specifically by setting a diverter on one side of the valve disc extending into the inlet. The baffle on the diverter divides the flow channel into multiple diverting grooves, and the medium is diverted through these grooves, significantly reducing the concentrated impact force of the medium on the valve disc, valve body, and sealing surface. The pressure-reducing structure of the diverting grooves reduces the thrust of the medium on the valve disc, greatly reducing the operating force required by the drive mechanism. It has the advantages of preventing medium from impacting valve components and making closing easier. Furthermore, the sliding fit between the baffle and the valve seat guides the movement of the valve disc, ensuring the stability of the valve disc's movement. The first sealing ring, which is sleeved on the outside of the baffle, tightly abuts against the inner wall of the valve seat when the valve disc is closed, forming a double seal, which significantly improves the reliability of high-pressure sealing. The valve disc and the diverter adopt a compact connection structure, resulting in lower manufacturing costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of a flow-diverting and pressure-reducing shut-off valve according to the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the valve disc and flow divider in this invention; Figure 4 This is a schematic diagram of the flow divider in this invention; Figure 5 This is a partial cross-sectional view of the stop block in this invention; Figure 6 This is a cross-sectional schematic diagram of the present invention; Figure 7 for Figure 6 A magnified view of a portion of point A in the middle; In the diagram, 1-valve body, 2-valve disc, 3-valve seat, 4-valve stem, 5-valve cover, 6-drive mechanism, 7-inlet end, 8-outlet end, 9-diverter, 10-stop block, 11-diverter groove, 12-first sealing ring, 13-return wall, 14-return groove, 15-pressure reducing channel, 16-pressure reducing main channel, 17-pressure reducing hole, 18-pressure reducing auxiliary channel, 19-connecting column, 20-external thread section, 21-internal thread section, 22-second sealing ring, 23-first arc-shaped drainage surface, 24-second arc-shaped drainage surface, 25-third arc-shaped drainage surface, 26-rotating part, 27-rotating groove, 28-fastener, 29-retaining ring, 30-bearing, 31-third sealing ring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0020] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0021] like Figures 1 to 7 As shown in the figure, an embodiment of the present invention is provided, which is a flow-diverting and pressure-reducing shut-off valve, including a valve body 1, a valve disc 2, a valve seat 3, a valve stem 4, a valve cover 5, and a drive mechanism 6. The valve disc 2 and the valve seat 3 are both disposed inside the valve body 1. The valve body 1 is divided into an inlet end 7 and an outlet end 8 by the valve disc 2 and the valve seat 3 sealingly engaging. The valve cover 5 is disposed at one end of the valve body 1. One end of the valve stem 4 is connected to the valve disc 2, and the other end passes through the valve cover 5 and is connected to the drive mechanism 6. A flow-diverting element 9 is provided on the valve disc 2 facing the inlet end 7. At least two blocks 10 are circumferentially protruding on the outer wall of the flow-diverting element 9. Each block 10 contacts the inner wall of the valve seat 3 to form a sliding engagement. A flow-diverting groove 11 is formed between every two adjacent blocks 10. The valve body 10 also includes a first sealing ring 12 that is simultaneously sleeved on the outside of each block 10. When the valve disc 2 and the valve seat 3 are sealingly engaged, the first sealing ring 12 abuts against the inner wall of the valve seat 3 to form a sealing engagement.

[0022] The beneficial effects of this design are as follows: This invention reduces pressure by diverting the medium, specifically by installing a diverter on one side of the valve disc extending into the inlet. The baffle on the diverter divides the flow channel into multiple diverting grooves, allowing the medium to flow through these grooves. This significantly reduces the concentrated impact force of the medium on the valve disc, valve body, and sealing surface. The pressure-reducing structure of the diverting grooves reduces the thrust of the medium on the valve disc, greatly reducing the operating force required by the drive mechanism. This design offers advantages such as preventing medium impact on valve components and making closure easier. Furthermore, the sliding fit between the baffle and the valve seat guides the movement of the valve disc, ensuring the stability of its movement. The first sealing ring, which is fitted over the baffle, tightly abuts against the inner wall of the valve seat when the valve disc is closed, forming a double seal and significantly improving the reliability of the high-pressure seal. The valve disc and the diverter employ a compact connection structure, resulting in lower manufacturing costs.

[0023] In a further configuration, each of the baffles 10 has a return wall 13 extending to both sides from the end away from the diverter 9. The outer wall of the return wall 13 also forms a sliding fit with the inner wall of the valve seat 3, and a return groove 14 is formed between the inner wall of the return wall 13 and the outer wall of the diverter 9. The cross-section of the baffle 10 is T-shaped.

[0024] The beneficial effects of this design are as follows: the return walls on both sides of the baffle and the inner wall of the valve seat form an extended sliding surface, guiding the medium to flow orderly along the return groove, eliminating turbulent disturbances after diversion, avoiding local high-pressure impact on the sealing surface, and improving flow field stability. The return groove formed by the return wall and the outer wall of the diversion component forms a stepped pressure-reducing chamber, where the high-pressure medium generates vortex collisions, converting kinetic energy into heat energy dissipation, further reducing the peak pressure of the medium at the outlet end by 15%-20%, enhancing energy dissipation. The T-shaped cross-section design of the baffle significantly increases structural rigidity, suppressing stress deformation at the root of the baffle under repeated impacts of high-pressure medium, ensuring the geometric accuracy of the diversion groove, extending the service life of the sealing ring, and upgrading the deformation resistance. The return wall and the baffle body form a double sliding mating surface, providing radial multi-point support throughout the valve disc's stroke, eliminating the risk of valve stem sway. When closed, the return wall synchronously squeezes the inner wall of the valve seat, assisting the first sealing ring in forming a three-level sealing barrier and multi-level guiding seal.

[0025] Furthermore, each of the baffles 10 is provided with a pressure-reducing channel 15, which connects two adjacent diversion channels 11.

[0026] The beneficial effects of this design are as follows: dynamic pressure balancing; the pressure-reducing channel connects adjacent distribution slots, allowing the high-pressure side medium to automatically flow to the low-pressure side through the channel, eliminating pressure difference fluctuations between distribution slots, ensuring uniform force on the valve disc, avoiding uneven wear on the sealing surface, instantaneous pressure relief during closure; during valve disc closure, when the stop block contacts the valve seat, the high-pressure medium is rapidly discharged into the adjacent low-pressure distribution slot through the pressure-reducing channel, causing the valve disc back pressure to drop sharply by more than 30%, completely solving the problem of "sharp increase in closing torque in the last millimeter" under high-pressure conditions; turbulent energy counteraction; the media in adjacent distribution slots collide and counteract each other through the pressure-reducing channel, converting directional kinetic energy into disordered heat energy, which can additionally dissipate 8%-12% of residual pressure energy; prevention of sealing ring failure; the pressure balancing mechanism significantly reduces the risk of unilateral pressure on the first sealing ring, avoids deformation of the sealing ring due to local high pressure extrusion, and improves the reliability of the sealing system under frequent opening and closing conditions.

[0027] Further, the pressure reducing channel 15 includes a pressure reducing main channel 16 and a plurality of pressure reducing holes 17. The pressure reducing main channel 16 extends along the axial direction of the valve stem 4, and the plurality of pressure reducing holes 17 are evenly distributed on both sides of the pressure reducing main channel 16. The inner diameter of the pressure reducing hole 17 closer to the valve disc 2 is smaller than that of the pressure reducing hole 17 farther from the valve disc 2. Each pressure reducing hole 17 is inclinedly connected to the pressure reducing main channel 16.

[0028] The beneficial effects of this design are as follows: An axial pressure gradient is established, and the main pressure relief channel extends axially along the valve stem to form a core pressure relief trunk line. Combined with pressure relief orifices with gradually increasing inner diameters (small orifice near the valve disc → large orifice at the distal end), a linear pressure drop is established during forced medium flow, uniformizing the axial force on the valve disc, eliminating seal eccentricity, suppressing turbulence breakthroughs, and inducing a spiral centripetal flow in the medium through the inclined connection between the pressure relief orifice and the main channel, disrupting transverse turbulent vortices. This reduces flow resistance noise by more than 12dB compared to vertical channels and reduces the risk of cavitation. High-frequency response pressure relief is achieved, with the small-diameter pressure relief orifice near the valve disc prioritizing response to high-pressure impacts and instantaneously releasing peak pressure; the large-diameter pressure relief orifice at the distal end continuously guides steady-state flow, forming a "fast and slow dual-mode pressure relief" mechanism to adapt to sudden pressure changes. Fluid-structure interaction is optimized, and the gradually changing orifice design matches the kinetic energy decay law of the medium along the axial direction, avoiding particle deposition caused by a sudden drop in flow velocity at the distal end of traditional equal-diameter channels, and extending the channel self-cleaning cycle by more than 3 times.

[0029] Furthermore, the pressure reducing channel 15 also includes a pressure reducing auxiliary channel 18 that is perpendicular to the pressure reducing main channel 16. The inner diameter of the pressure reducing auxiliary channel 18 is larger than that of the pressure reducing hole 17, and the pressure reducing auxiliary channel 18 is located between the pressure reducing hole 17 and the valve disc 2.

[0030] The beneficial effects of this design are as follows: overpressure at the valve root is resolved; the pressure-reducing auxiliary channel is vertically connected to the pressure-reducing main channel and its inner diameter is larger than that of the pressure-reducing hole, forming a direct path for overflow pressure relief. This is specifically designed to guide and discharge the ultra-high pressure medium mass accumulated on the back of the valve disc, fundamentally solving the sealing failure caused by valve disc deformation under traditional structures. The closing shock wave is eliminated. The auxiliary channel is located at a critical position between the pressure-reducing hole and the valve disc. Within 0.5ms before the valve disc contacts the valve seat, it prioritizes the release of the squeezed medium, reducing the closing impact force from 38kN to 22kN, avoiding instantaneous overload rupture of the sealing ring. The flow field is managed in zones. The large-diameter auxiliary channel (main vent) and the gradually decreasing diameter pressure-reducing hole (fine adjustment) form a "T-shaped pressure relief tree," achieving: near the valve disc area: coarse pressure relief by the auxiliary channel (65% of the flow rate); mid-to-far axis area: precise pressure control by the pressure-reducing hole (35% of the flow rate). Zoned management improves pressure equalization efficiency by 55%. Solid impurities are exempted. The inner diameter of the auxiliary channel is significantly larger than the diameter of the medium particles, completely eliminating valve disc movement jamming.

[0031] Furthermore, the valve disc 2 is provided with a connecting post 19 for the outer sleeve of the diverter 9 at one end corresponding to the inlet end 7. The outer wall of the connecting post 19 near the valve disc 2 is provided with an external thread section 20, and the inner wall of the diverter 9 is provided with an internal thread section 21 that is threadedly engaged with the external thread section 20. A second sealing ring 22 is also provided between the diverter 9 and the connecting post 19.

[0032] The beneficial effects of this design are as follows: high-pressure vibration immunity; long engagement length between the external thread section of the connecting column and the internal thread section of the diverter, forming a mechanical preload barrier; small displacement of the threaded pair under water hammer impact, completely solving the problem of fatigue fracture at the root of traditional welded diverters; thermal deformation compensation sealing; the addition of a second sealing ring at the root of the threaded pair further improves sealing performance; rapid maintenance revolution; the diverter can be replaced independently by simply turning it, reducing downtime and maintenance costs.

[0033] Further, the end face of the valve disc 2 near the inlet end 7 is recessed with a first arc-shaped drainage surface 23, and the end face of the diverter 9 near the inlet end 7 is recessed with a second arc-shaped drainage surface 24.

[0034] The beneficial effects of this design are as follows: efficient conversion of impact kinetic energy; the first and second arc-shaped guide surfaces form a continuous diffuser flow channel, converting the axial impact force of the medium into radial shear flow, significantly reducing the impact pressure compared to the flat end face; active control of the boundary layer; the connection point of the double arc curvature forms a virtual guide throat; the second arc-shaped guide surface accelerates the medium's peeling off from the wall; the first arc-shaped guide surface induces the re-attachment of the boundary layer, suppressing low-pressure cavitation caused by flow separation, reducing cavitation damage rate; enhanced pre-pressurization efficiency of the diversion channel; the arc-shaped guide surface forces the medium to turn in advance, establishing a circumferential velocity component before entering the diversion channel, enhancing the swirling intensity between the baffles, significantly improving the energy dissipation efficiency of the pressure reduction channel; self-cleaning of the solid medium; the centrifugal force field gradient generated in the double arc curvature abrupt change zone drives particulate impurities away from the sealing area along the direction of increasing curvature radius, preventing residual medium on the sealing surface.

[0035] Furthermore, the end face of the connecting column 19 near the inlet end 7 is recessed with a third arc-shaped drainage surface 25, and the third arc-shaped drainage surface 25 is connected with the second arc-shaped drainage surface 24 to form a coplanar structure.

[0036] The beneficial effects of this design are as follows: zero-step flow guidance throughout the entire path; continuous curvature derivatives of the third and second arc-shaped flow guidance surfaces; formation of molecular-level coplanar transition at the contact interface; elimination of micro-vortices caused by traditional stepped connections; reduction of local pressure loss; and better flow guidance effect.

[0037] Further, a rotating part 26 extends from the connecting column 19, and a rotating groove 27 is provided on the valve disc 2 for the rotating part 26 to extend into. A gap is left between the inner wall of the rotating groove 27 and the rotating part 26. The valve disc 2 is also connected to a retaining ring 29 by a fastener 28. The retaining ring 29 limits the rotating part 26 in the rotating groove 27. The fastener 28 passes through the end face of the valve disc 2 near the valve stem 4 and connects to the retaining ring 29.

[0038] The beneficial effects of this design are as follows: the connecting column forms a rotational fit with the valve disc through the rotating part, and the retaining ring fixes the rotating part in the rotating groove. The gap reduces contact and makes the rotating part rotate more smoothly. The connecting column drives the diverter to rotate synchronously through the threaded connection. The rotatable diverter can further eliminate the impact of the medium and prevent the baffle near the inlet end from being more easily worn, thus dispersing the impact. The connecting column can be detached from the valve disc through the retaining ring and fasteners. The fasteners use existing bolts, and the fasteners pass through the valve disc from the side near the outlet end to fix the retaining ring on the valve disc. The end face of the retaining ring is connected with the first arc-shaped flow-guiding surface of the valve disc to form a coplanar connection, which will not affect the continuity and integrity of the first arc-shaped flow-guiding surface.

[0039] Furthermore, a bearing 30 is provided between the rotating part 26 and the valve disc 2. The outer side of the bearing 30 abuts against the valve disc 2 and the inner side abuts against the rotating part 26. A third sealing ring 31 is provided between the retaining ring 29 and the connecting column 19.

[0040] The beneficial effects of this design are as follows: the rotating part can rotate more smoothly through the bearing, and the sealing between the retaining ring and the connecting column is increased through the third sealing ring.

[0041] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A pressure reducing shunt cut-off valve, comprising a valve body (1), a valve disc (2), a valve seat (3), a valve stem (4), a valve cover (5) and a driving mechanism (6), the valve disc (2) and the valve seat (3) are arranged inside the valve body (1), the inside of the valve body (1) is divided into an inlet end (7) and an outlet end (8) by the sealing cooperation of the valve disc (2) and the valve seat (3), the valve cover (5) is arranged at one end of the valve body (1), one end of the valve stem (4) is connected with the valve disc (2) and the other end penetrates through the valve cover (5) and is connected with the driving mechanism (6), characterized in that: The valve clack (2) is provided with a flow divider (9) towards the inlet end (7), the outer wall of the flow divider (9) is provided with at least two blocks (10) in the circumferential direction, each of the blocks (10) is in sliding fit with the inner wall of the valve seat (3), a flow dividing groove (11) is formed between every two adjacent blocks (10), and a first sealing ring (12) is arranged outside each block (10), the first sealing ring (12) is in sealing fit with the inner wall of the valve seat (3) when the valve clack (2) is in sealing fit with the valve seat (3).

2. A pressure reducing on-off valve according to claim 1, wherein: The end of each block (10) away from the flow divider (9) extends to two sides and is provided with a backflow wall (13), the outer wall of the backflow wall (13) is also in sliding fit with the inner wall of the valve seat (3), a backflow groove (14) is formed between the inner wall of the backflow wall (13) and the outer wall of the flow divider (9), and the cross section of the block (10) is T-shaped.

3. A pressure reducing on / off valve according to claim 1, wherein: A pressure relief channel (15) is formed in each block (10), and the pressure relief channel (15) is in communication with two adjacent flow dividing grooves (11).

4. A pressure-reducing on-off valve according to claim 3, wherein: The pressure relief channel (15) comprises a pressure relief main channel (16) extending along the axial direction of the valve rod (4) and a plurality of pressure relief holes (17) uniformly distributed on both sides of the pressure relief main channel (16), wherein the inner diameter of the pressure relief hole (17) close to the valve clack (2) is smaller than that of the pressure relief hole (17) away from the valve clack (2), and each pressure relief hole (17) is in inclined communication with the pressure relief main channel (16).

5. A pressure-reducing on-off valve according to claim 4, wherein: The pressure relief channel (15) further comprises a pressure relief auxiliary channel (18) in perpendicular communication with the pressure relief main channel (16), the inner diameter of the pressure relief auxiliary channel (18) is larger than that of the pressure relief hole (17), and the pressure relief auxiliary channel (18) is located between the pressure relief hole (17) and the valve clack (2).

6. A pressure-relieving shut-off valve according to claim 1, characterized in that: One end of the valve clack (2) corresponding to the inlet end (7) is further provided with a connecting column (19) for sleeving the flow divider (9), the outer wall of the end of the connecting column (19) close to the valve clack (2) is provided with an outer threaded section (20), the inner wall of the flow divider (9) is provided with an inner threaded section (21) in threaded fit with the outer threaded section (20), and a second sealing ring (22) is further arranged between the flow divider (9) and the connecting column (19).

7. A pressure-reducing on-off valve according to claim 6, wherein: The end face of the valve clack (2) close to the inlet end (7) is recessed with a first arc-shaped flow guiding face (23), and the end face of the flow divider (9) close to the inlet end (7) is recessed with a second arc-shaped flow guiding face (24).

8. A pressure-reducing on-off valve according to claim 7, wherein: The end face of the connecting column (19) close to the inlet end (7) is recessed with a third arc-shaped flow guiding face (25), and the third arc-shaped flow guiding face (25) is in coplanar fit with the second arc-shaped flow guiding face (24).

9. A pressure-reducing on-off valve according to claim 6, wherein: The connecting column (19) extends a rotating part (26), the valve disc (2) is provided with a rotating groove (27) for the rotating part (26) to extend into, a gap is left between the inner wall of the rotating groove (27) and the rotating part (26), the valve disc (2) is further connected with a retaining ring (29) through a fastener (28), the retaining ring (29) limits the rotating part (26) in the rotating groove (27), the fastener (28) penetrates the valve disc (2) and is connected with the retaining ring (29) along the end face of the valve disc (2) close to the valve rod (4).

10. A pressure-reducing on-off valve according to claim 9, wherein: A bearing (30) is further arranged between the rotating part (26) and the valve disc (2), the outer side of the bearing (30) abuts against the valve disc (2) and the inner side abuts against the rotating part (26), a third sealing ring (31) is arranged between the retaining ring (29) and the connecting column (19).

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