Multifunctional anti-scouring one-way throttling stop valve

Abstract

The application discloses a multifunctional anti-scouring one-way throttling cut-off valve, which comprises a valve body provided with an air inlet, an air outlet and a valve cavity, the valve cavity is sealingly positioned with a lower valve seat, the lower valve seat is sealingly positioned with a valve cover in a direction opposite to the valve cover, the lower valve seat and the valve cover are positioned with an inner step structure and are provided with a throttling valve seat through interference fit, the throttling valve seat is provided with throttling holes in the side part, the valve cover is slidingly provided with a throttling valve core in the axial direction through dynamic sealing, the throttling valve core is slidingly provided with a cut-off valve core in the axial direction through dynamic sealing, the throttling valve core and the cut-off valve core are linked through a steel ball, the lower valve seat is sealingly positioned with a one-way valve seat, the inner hole of the one-way valve seat is provided with a sunken table and a one-way valve core capable of elastically blocking the sunken table. The throttling cut-off valve core structure design is adopted, the throttling valve seat has a unique structure to realize independent throttling and cutting functions, the pipeline pressure is used for sealing, the best effects of throttling, cutting and one-way are achieved, and the sealing performance is good.

Description

TECHNICAL FIELD

[0001] The present application relates to a multifunctional anti-scouring one-way throttling and blocking valve, belonging to the technical field of shale gas extraction devices. BACKGROUND

[0002] Currently, the commonly used throttling valves and blocking valves both adopt single-core valves, which have single function and respectively have throttling and blocking functions. Generally, the throttling valve is used for throttling and blocking, but its throttling function is guaranteed, and its blocking function is poor and cannot guarantee complete sealing.

[0003] For example, a throttling and blocking valve for a cooling and heating machine (Patent No. CN210050301U) realizes throttling and blocking functions in the valve body, but the overall structure is that the blocking valve and the two-way throttling structure are assembled as two separate structures, i.e., the throttling and blocking structures are connected in series, which occupies a large space and is complicated to operate.

[0004] In addition, the existing throttling and blocking valves have poor anti-scouring effect, and the valve core and valve seat outlet are prone to wear during throttling. SUMMARY

[0005] In view of the above deficiencies in the prior art, the present application provides a multifunctional anti-scouring one-way throttling and blocking valve, which adopts a throttling and blocking dual-element valve core structure design, and the throttling valve seat has a unique structure to realize independent throttling and blocking functions. The blocking sealing surface does not participate in throttling, and at the same time, it ensures that the backflow occurs automatically when the downstream pressure is high during gap production, and the pipe pressure is used to assist sealing, achieving the best effect of throttling, blocking, and one-way, and having good sealing performance.

[0006] In order to achieve the above purpose, the technical scheme of the present application is as follows: a multifunctional anti-scouring one-way throttling and blocking valve, comprising a valve body with an inlet and an outlet, the inlet and the outlet intersect in a valve cavity in the valve body, the valve cavity is sealed and positioned with a lower valve seat along the position of the outlet, the lower valve seat is sealed and positioned with a valve cover opposite to the position, the lower valve seat and the valve cover are positioned with an inner step structure and are interference-fitted with a throttling valve seat, the throttling valve seat has a plurality of throttling holes on the side, which are connected with the inlet and the axial through hole in the throttling valve seat.

[0007] The valve cover is axially dynamically sealed with a throttle spool which is slidably fitted in the stepped inner hole of the throttle seat and can abut against the stepped inner shoulder of the throttle seat; the throttle spool is axially dynamically sealed with a cut-off spool, the end of which is fixed with an anti-scouring sleeve which can be axially slidably fitted in the axial through hole of the throttle seat, the other end of which is fixed with a valve stem which can axially slide with the valve cover, wherein the end inner hole of the throttle spool is threadedly fitted with a lock sleeve, the inner hole of the lock sleeve is fitted with an inner sleeve, the cut-off spool penetrates the inner sleeve, and the outer periphery of the cut-off spool is provided with an annular groove, the side of the inner sleeve is provided with a plurality of steel ball holes opposite the position of the annular groove, the annular groove and the steel ball hole are fitted with a steel ball which abuts against the inner hole wall of the lock sleeve;

[0008] One end of the inner hole of the lock sleeve is provided with a first counterbore, and a first spring is axially arranged between the first counterbore and the inner sleeve; the other end of the inner hole of the lock sleeve is provided with a second counterbore, the root of the second counterbore is a bevel structure which transitions to the inner hole thereof, the distance between the side of the second counterbore and the inner hole wall of the lock sleeve is less than the diameter of the steel ball, and the distance is greater than or equal to the depth of the annular groove;

[0009] The other side inner hole of the lower valve seat is sealingly positioned with a one-way valve seat, the inner hole of the one-way valve seat has a counterbore and a one-way valve core which can elastically block the counterbore.

[0010] Further, the valve cover, valve stem, cut-off spool, inner sleeve, lock sleeve, and throttle spool enclose a pressure-assisted sealing cavity, and the valve cover is provided with a pressure-assisted sealing air passage which leads from the valve cavity to the pressure-assisted sealing cavity.

[0011] Further, a plurality of O-shaped sealing rings are fitted between the valve cover and the valve body, and an outer protruding ring is provided on the outer circumference of the valve cover, the valve body is threadedly fitted with a nut which limits the outer protruding ring on the end face of the valve body.

[0012] Further, a limiting long groove is axially arranged on the outer side of the valve stem, a positioning pin is inwardly positioned on the side of the valve cover, the end of the positioning pin is in the limiting long groove, and the position of the positioning pin on the side of the valve cover is between any two O-shaped sealing rings.

[0013] Further, the valve cover has a stepped inner hole, a combined sealing assembly which cooperates with the valve stem is installed in the stepped inner hole, and a pressure cap which positions the combined sealing assembly is installed in the stepped inner hole, and the pressure cap is threadedly fitted with the valve cover.

[0014] Further, a valve stem nut is threadedly fitted at the end position of the valve stem, and the valve stem nut is axially positioned on the inner hole of the valve seat by at least two groups of bearings; the bearings are axially pressed and positioned on the pressure cap by an end cover, and the end cover is fixed on the end of the valve cover by a clamping screw.

[0015] Further, a hand wheel or an electric actuating element is fixed to the valve stem nut for driving the axial feeding of the valve stem.

[0016] Further, the lower valve seat end is threadedly connected with a locking nut which limits the one-way valve seat on the lower valve seat stepped bore, and the locking nut is positioned with a spring seat, the core shaft is fixed to the tail of the one-way valve core, the core shaft penetrates the stepped bore of the spring seat, and the one-way valve spring is arranged axially between the stepped bore of the spring seat and the one-way valve core, and the sheath positioned on the one-way valve core is arranged outside the one-way valve spring.

[0017] Further, the core shaft is provided with a one-way valve exhaust port which is communicated to the position of the one-way valve spring by the gas outlet.

[0018] Further, the valve stem end face is fixed with a direction indicating plate by a cross slot countersunk screw.

[0019] The beneficial effects of the present application are that the throttle core, the cut-off core and the one-way valve core are organically integrated in the valve body, specifically the throttle and cut-off dual-element core structure is adopted, the throttle valve seat is designed to independently work in throttle and cut-off, the cut-off sealing surface does not participate in throttle, and the one-way valve core and valve seat structure are combined to ensure the automatic cut-off of the backflow generated by the high downstream pressure during the gap production, the pipeline pressure is used to assist the sealing, the best effects of throttle, cut-off and one-way are achieved, and the sealing performance is good. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure schematic view of the manual control one-way throttle cut-off valve of the present application;

[0021] Figure 2 is Figure 1 a structure schematic view of the gas circuit control;

[0022] Figure 3 is Figure 1 an enlarged structure view of part A;

[0023] Figure 4 is a structure schematic view of the electric actuating one-way throttle cut-off valve of the present application;

[0024] Figure 5 is Figure 1 a structure schematic view of the lock sleeve. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in combination with specific embodiments and drawings.

[0026] A kind of as Figures 1-5The multifunctional anti-scouring one-way throttling cut-off valve shown comprises a valve body 13 with an air inlet 44 and an air outlet 45, the air inlet 44 and the air outlet 45 intersecting a valve cavity in the valve body 13, the valve cavity being sealingly positioned with a lower valve seat 15 at the position of the air outlet 45, the lower valve seat 15 being sealingly positioned with a valve cover 11 at the position, the lower valve seat 15 and the valve cover 11 being positioned with a throttling seat 26 in an inner stepped structure and interference fit, the throttling seat 26 having a plurality of throttling holes at the side, the throttling holes being communicated with the air inlet 44 and the axial through hole 303 in the throttling seat 26;

[0027] The valve cover 11 is sealingly slidingly fitted with a throttling valve core 30 in the axial direction, the throttling valve core 30 being slidingly fitted in the stepped inner hole 301 of the throttling seat 26 and abutting against the stepped inner step face 302 of the throttling seat 26; the throttling valve core 30 is sealingly slidingly fitted with a cut-off valve core 36 in the axial direction, the cut-off valve core 36 being fixedly connected with an anti-scouring sleeve 27 which is axially slidingly fitted in the axial through hole 303 of the throttling seat 26 at one end and with a valve rod 2 which is axially slidingly fitted with the valve cover 11 at the other end, wherein the inner hole of the throttling valve core 30 is threadedly fitted with a lock sleeve 31, the inner hole of the lock sleeve 31 is fitted with an inner sleeve 34, the cut-off valve core 36 penetrates through the inner sleeve 34, the cut-off valve core 36 is provided with an annular groove at the outer periphery, the inner sleeve 34 is provided with a plurality of steel ball holes at the side which are opposite to the annular groove, a steel ball 32 is fitted in the annular groove and the steel ball hole, and the steel ball 32 abuts against the inner hole wall of the lock sleeve 31;

[0028] The inner hole of the lock sleeve 31 is provided with a first sunken platform at one end, the first spring 33 is arranged axially between the inner hole of the lock sleeve 31 and the inner sleeve 34, the inner hole of the lock sleeve 31 is provided with a second sunken platform at the other end, the second sunken platform is provided with a bevel structure 310 which is transitioned to the inner hole thereof, the distance between the side of the second sunken platform and the inner hole wall of the lock sleeve is smaller than the diameter of the steel ball 32 and greater than or equal to the depth of the annular groove;

[0029] The inner hole of the lower valve seat 15 at the other side is sealingly positioned with a one-way valve seat 16, the inner hole of the one-way valve seat 16 is provided with a sunken platform and a one-way valve core 17 which can elastically block the sunken platform.

[0030] In the case, the valve body 13 comprises a straight-through functional mounting position and the air inlet 44 position at the side, the air inlet 44 is opposite to the valve cavity, the lower part of the valve cavity is an air outlet passage, the air outlet passage is a structure with stepped counterbores at both ends for positioning the lower valve seat 15; the upper part of the valve cavity is a straight-through hole for positioning and fitting the valve cover 11.

[0031] The lower valve seat 15 is directly positioned on the stepped sink of the outlet channel by the stepped circular table, and a plurality of lower valve seat sealing rings 14 are arranged between the lower valve seat 15 and the valve body 13 to ensure the air tightness of the lower valve seat 15. The inner hole end of the lower valve seat 15 is provided with a sink, which is in interference fit with the throttle valve seat 26 to ensure reliable sealing. The inner hole of the throttle valve seat 26 is also designed as a sink structure, and a plurality of throttle holes are designed on the inner hole wall. The diameter of the throttle hole can be designed according to the actual situation. In this case, the diameter of the throttle hole is designed as a plurality of different diameters, and the diameter of the throttle hole is designed as a plurality of different diameters. Figure 1 It can be seen that the stepped inner hole 301 of the throttle valve seat 26 is consistent with the diameter of the lower part of the valve cover 11, mainly for the axial sliding of the throttle valve core 30, and the sealing function of the valve is realized by the sealing of the throttle valve core 30 and the throttle hole on the throttle valve seat 26. Here, the throttle valve core 30 and the valve cover 11 are dynamically sealed by the throttle valve core sealing ring 28, and at the same time, due to the cooperation between the throttle valve seat 26 and the valve cover 11, the sealing surface of the throttle valve core 30 is not washed by the fluid during the throttling process.

[0032] The lower part of the cut-off valve core 36 is slidably fitted in the throttle valve core 30, and the cut-off valve core sealing ring 29 is arranged between the cut-off valve core 36 and the throttle valve core 30 to ensure the dynamic sealing performance therebetween. The anti-washing sleeve 27 fixed to the end of the cut-off valve core 36 is in sliding fit with the axial through hole 303 of the throttle valve seat 26, and a plurality of inner through holes are designed on the outer circle of the anti-washing sleeve 27 to the inner hole for the flow of fluid.

[0033] The upper part of the cut-off valve core 36 is linked with the throttle valve core 30 through the lock sleeve 31, the inner sleeve 34, the first spring 33 and the steel ball 32. The inner sleeve 34 is penetrated by the cut-off valve core 36, and the outer periphery of the inner sleeve 34 is a multi-stage stepped shaft, which is in position with the first spring 33 by cooperating with the lock sleeve 31, and is limited at the end of the lock sleeve 31.

[0034] When the throttle valve core 30 is fed to throttle, the steel ball 32 is in the ring groove of the cut-off valve core 36, the steel ball hole of the inner sleeve 34, and the inner hole wall of the lock sleeve 31. Because the steel ball 32 is interlocked with the cut-off valve core 36 and the inner sleeve 34, when the first spring 33 is in a critical state during the feeding process, the throttle valve core 30 and the cut-off valve core 36 move synchronously, at this time, the sealing surface of the cut-off valve core 36 is hidden in the throttle valve core 30, that is, the throttling fluid cannot wash the sealing surface of the cut-off valve core 36, and at the same time, the throttle valve core 30 is prevented from being washed by the anti-washing sleeve 27, so that the valve seat sealing surface is not washed.

[0035] When the throttle valve core 30 moves to the inner step surface 302 of the throttle valve seat 26, complete throttling is achieved. The cut-off valve core 36 continues to feed and move. After the steel ball 32 reaches the inclined structure 310, the steel ball 32 will enter the second recessed position of the locking sleeve 31 along the inclined structure 310. At this time, the steel ball 32 releases the linkage state between the cut-off valve core 36 and the inner sleeve 34. At this time, the cut-off valve core 36 continues to cut off until the sealing surface of the cut-off valve core 36 is in contact with the sealing surface of the throttle valve core 30, and the valve is completely closed.

[0036] The valve cover 11, valve stem 2, shut-off valve core 36, inner sleeve 34, locking sleeve 31, and throttle valve core 30 together form a pressure-assisted sealing cavity 42. The valve cover 11 is provided with a pressure-assisted sealing air passage 43 that leads from the valve cavity to the pressure-assisted sealing cavity 42. The pressure-assisted sealing air passage 43 includes an axial elongated hole on the outer circle of the valve cover 11 and a radial through hole perpendicular to the valve cover 11, extending into the pressure-assisted sealing cavity 42.

[0037] Several O-rings 37 are fitted between the valve cover 11 and the valve body 13, and an outer convex ring is provided on the outer circumference of the valve cover 11. A union 12 is threaded into the valve body 13, and the outer convex ring is confined to the end face of the valve body 13. At the same time, a limiting groove is provided axially on the outer side of the valve stem 2, and a locating pin 35 is positioned inward on the side of the valve cover 11. The end of the locating pin 35 is located in the limiting groove, and the position of the locating pin 35 on the side of the valve cover 11 is between any two O-rings 37.

[0038] The valve cover 11 has a stepped inner bore, on which a combined sealing assembly 10 that mates with the valve stem 2 and a pressure cap 9 that positions the combined sealing assembly 10 are installed. The pressure cap 9 is threaded into the valve cover 11. A valve stem nut 8 is threaded into the end of the valve stem 2. The valve stem nut 8 is axially positioned on the inner bore of the valve seat 11 by at least two sets of bearings 7. The bearings 7 are axially pressed and positioned onto the pressure cap 9 by an end cap 6, which is fixed to the end of the valve cover 11 by a set screw 39. A handwheel 5 or an electric actuator 48 for driving the valve stem 2 axially is fixed to the valve stem nut 8. Figure 1 and Figure 4 .

[0039] Figure 1 In the middle, the handwheel 5 is positioned on the valve stem 2 via the clamping nut 4 and the second locking nut 3, and is used to drive the valve stem nut 8. And... Figure 4 In the valve cover 11, an external positioning flange 50 is connected. The flange 50 is fixed to the electric actuator 48 via hexagon socket bolts 49. The power actuation end of the electric actuator 48 is poweredly connected to the valve stem nut 8. To facilitate intuitive adjustment of throttling, a direction indicator plate 40 is fixed to the end face of the valve stem 2 via countersunk head screws 41. A protective cover 1 is installed at its end.

[0040] The lower valve seat 15 end is threadedly fitted with a locking nut 21, the locking nut 21 limits the one-way valve seat 16 on the lower valve seat 15 stepped bore, and the locking nut 21 is positioned with a spring seat 20, the one-way valve core 17 tail is fixedly connected with a core shaft 24, the core shaft 24 penetrates the stepped bore of the spring seat 20, and the stepped bore of the spring seat 20 and the one-way valve core 17 are axially provided with a one-way valve spring 19, and the one-way valve spring 19 is provided with a sheath 18 positioned on the one-way valve core 17.

[0041] The core shaft 24 is provided with a one-way valve exhaust port 46 communicated to the position of the one-way valve spring 19 by the gas outlet 45. Finally, the end of the cutoff valve core 36 is also provided with a blowdown port 47, which is used for blowdown when the cutoff valve core 36 moves to the sealing surface of the throttle valve seat 26.

[0042] When working:

[0043] The natural gas from the upstream enters the valve body main passage through the gas inlet 44, enters through the throttle hole of the throttle valve seat 26, and changes the passage area by moving the throttle valve core 30, thereby achieving throttling. The throttle valve core 30 and the cutoff valve core 36 move downward at the same time, directly and completely throttling. The cutoff valve core 36 removes the restriction on the steel ball 32 and continues to move until the sealing surface of the cutoff valve core 36 is in contact with the sealing surface of the throttle valve core 30, thereby achieving cutoff and closing the valve.

[0044] When the valve is opened, the cutoff valve core 36 moves in the opposite direction, the anti-scouring sleeve 27 protects the valve seat sealing surface from being scoured in the fluid flow process, and the pressure-assisted sealing air passage 43 on the valve cover 11 ensures pressure-assisted sealing during cutoff. At this time, the throttle valve core 30 does not move in the opposite direction when the cutoff valve core 36 moves in the opposite direction, and when the end surface of the cutoff valve core 36 is in contact with the end surface of the inner sleeve 34, the inner sleeve 34 is driven to move, and the steel ball 32 moves synchronously with the steel ball hole on the inner sleeve 34. When it moves to the position of the inclined surface structure 310, the steel ball 32 enters the annular groove of the cutoff valve core 36 due to the inward extrusion force of the inclined surface structure 310. At this time, the throttle valve core 30 and the cutoff valve core 36 move in the opposite direction synchronously, thereby achieving throttling.

[0045] When the gas pressure at the upstream gas inlet 44 is higher than that at the downstream gas outlet 45, the one-way valve core 17 moves under the action of the pressure, opens the passage and works in a normal state. When the gas pressure at the upstream gas inlet 44 is lower than that at the downstream gas outlet 45, the one-way valve core 17 moves to be in contact with the sealing surface of the one-way valve seat 16 to prevent backflow of the fluid, and achieves good sealing effect under the action of pressure-assisted sealing.

[0046] The throttle valve seat 26, the throttle valve core 30, the one-way valve seat 16, the one-way valve core 17 and the anti-scouring sleeve 27 in the case are all made of tungsten carbide; and the cutoff valve core 36, the locking sleeve 31, the inner sleeve 3 and the spring seat 20 are made of martensitic stainless steel. The sealing surface of the cutoff valve core 36 is subjected to hardening treatment.

[0047] The above describes the technical solutions provided by the embodiments of the present application in detail. The principles and implementation manners of the embodiments of the present application are described by applying specific examples. The above descriptions of the embodiments are only used to help understand the principles of the embodiments of the present application. Meanwhile, for the general technical personnel in the art, the embodiments of the present application can be changed in the specific implementation manners and application scopes. In conclusion, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A multi-functional anti-scouring one-way throttling stop valve, comprising a valve body (13) having an inlet port (44) and an outlet port (45) intersecting a valve cavity in the valve body (13), characterized in that: The valve cavity is sealed and positioned with a lower valve seat (15) at the position of the air outlet (45), the lower valve seat (15) is sealed and positioned with a valve cover (11) opposite to it, the lower valve seat (15) and the valve cover (11) are positioned with an inner stepped structure and are interference-fitted with a throttle valve seat (26), the throttle valve seat (26) has a plurality of throttle holes on the side, which communicate with the air inlet (44) and the axial through hole (303) in the throttle valve seat (26); The throttle valve core (30) is slidingly fitted in the stepped inner hole (301) of the throttle valve seat (26) and can abut against the stepped inner step face (302) of the throttle valve seat (26), the cut-off valve core (36) is slidingly fitted in the axial direction and dynamically sealed in the throttle valve core (30), the end of the cut-off valve core (36) is fixedly connected with the anti-scouring sleeve (27) which can be axially slidingly fitted in the axial through hole (303) of the throttle valve seat (26), the other end is fixedly connected with the valve rod (2) which can axially slide with the valve cover (11), wherein the inner hole of the lock sleeve (31) at the end of the throttle valve core (30) is threadedly fitted, the inner sleeve (34) is fitted in the inner hole of the lock sleeve (31), the cut-off valve core (36) penetrates the inner sleeve (34), and the cut-off valve core (36) is provided with an annular groove, the side of the inner sleeve (34) is provided with a plurality of steel ball holes opposite to the position of the annular groove, a steel ball (32) is fitted in the annular groove and the steel ball hole, and the steel ball (32) abuts against the inner hole wall of the lock sleeve (31); The first spring (33) is arranged axially between the first counterbore of the inner hole of the lock sleeve (31) and the inner sleeve (34), the second counterbore has a slope structure (310) which transitions to the inner hole, the distance between the side of the second counterbore and the inner hole wall of the lock sleeve is smaller than the diameter of the steel ball (32) and greater than or equal to the depth of the annular groove; The inner hole of the other side of the lower valve seat (15) is sealed and positioned with a one-way valve seat (16), the inner hole of the one-way valve seat (16) has a counterbore and a one-way valve core (17) which can elastically block the counterbore.

2. The multi-functional anti-washing one-way throttling stop valve according to claim 1, characterized in that: The valve cover (11), the valve rod (2), the cut-off valve core (36), the inner sleeve (34), the lock sleeve (31), and the throttle valve core (30) enclose a pressure-assisted sealing cavity (42), and the valve cover (11) is provided with a pressure-assisted sealing air channel (43) which leads from the valve cavity to the pressure-assisted sealing cavity (42).

3. The multi-functional anti-washing one-way throttling stop valve according to claim 1, characterized in that: A plurality of O-shaped sealing rings (37) are fitted between the valve cover (11) and the valve body (13), and an outer convex ring is arranged on the outer circumference of the valve cover (11), the nut (12) is threadedly fitted with the valve body (13) and limits the outer convex ring on the end face of the valve body (13).

4. The multi-functional anti-washing one-way throttling stop valve according to claim 3, characterized in that: The valve stem (2) is provided with a limiting long slot in the outer side in the axial direction, and a positioning pin (35) is positioned inwardly in the side of the valve cover (11), the end of the positioning pin (35) is in the limiting long slot, and the position of the positioning pin (35) on the side of the valve cover (11) is between any two O-shaped sealing rings (37).

5. The multi-functional anti-flush one-way throttling stop valve according to claim 1, characterized in that: The valve cover (11) is provided with a stepped inner hole, a combined sealing assembly (10) matched with the valve stem (2) is installed in the stepped inner hole, and a pressing cap (9) for positioning the combined sealing assembly (10) is installed in the stepped inner hole, and the pressing cap (9) is screwed with the valve cover (11).

6. The multi-functional anti-flush one-way throttling stop valve according to claim 5, characterized in that: The valve stem (2) is screwed with a valve stem nut (8) at the end, the valve stem nut (8) is axially positioned on the inner hole of the valve cover (11) by at least two groups of bearings (7), the bearings (7) are axially pressed and positioned on the pressing cap (9) by an end cover (6), and the end cover (6) is fixed on the end of the valve cover (11) by a clamping screw (39).

7. The multi-functional anti-flush one-way throttling stop valve according to claim 6, characterized in that: The valve stem nut (8) is fixed with a hand wheel (5) or an electric actuator (48) which can be used to drive the axial feeding of the valve stem (2).

8. The multi-functional anti-flush one-way throttling stop valve according to claim 1, wherein: The lower valve cover (15) is screwed with a locking nut (21) at the end, the locking nut (21) limits the one-way valve cover (16) on the stepped inner hole of the lower valve cover (15), and the locking nut (21) is provided with a spring seat (20), the tail of the one-way valve core (17) is fixed with a core shaft (24), the core shaft (24) penetrates the stepped inner hole of the spring seat (20), and the one-way valve spring (19) is arranged in the axial direction between the stepped inner hole of the spring seat (20) and the one-way valve core (17), and the sheath (18) positioned on the one-way valve core (17) is arranged outside the one-way valve spring (19).

9. The multi-functional anti-flush one-way throttling stop valve according to claim 8, characterized in that: The core shaft (24) is provided with a one-way valve exhaust port (46) which is communicated to the position of the one-way valve spring (19) by the gas outlet (45).

10. The multi-functional anti-flush one-way throttling stop valve according to claim 1, wherein: The end face of the valve stem (2) is fixed with a direction indicating plate (40) by a cross slot countersunk screw (41).

Images