A cage-type erosion-resistant throttling plug double-acting valve

Abstract

The present invention provides a caged, erosion-resistant, throttling double-acting valve with a throttle cock. The valve comprises a valve body and a valve seat vertically disposed at the top of the valve body. The valve seat has a continuous step formed at the top, a caged cock coaxially rotating at the bottom of the continuous step, a throttling rod coaxially threadedly connected to the caged cock, a cock throttling hole formed in the caged cock, a valve cavity connected to the cock throttling hole formed in the continuous step, a sealing disk provided on the continuous step for sealing the top of the valve cavity, a valve body flow hole connected to the valve cavity, an upstream fluid passage and a downstream fluid passage extending through the valve body, a seat fluid passage connected to the upstream fluid passage, the caged cock having an upstream fluid passage connecting the caged cock interior and the seat fluid passage, and the valve body flow hole connected to the downstream fluid passage. The present invention simplifies the workflow, extends the service life of the device, reduces noise, and improves operational safety.

Description

Technical Field

[0001] The invention relates to the technical field of plug valves, in particular to a cage-type erosion-resistant throttling plug double-acting valve. Background Art

[0002] Currently, during fracturing and well-killing pumping operations in domestic oil and gas fields, throttling is performed through partially open plug valves to control the flow of high-pressure fluids, or through needle throttling valves that are rapidly throttled to fully closed to achieve soft-starting of the pump to prevent water hammer damage to the pump and pipeline. This throttling effect causes severe erosion of the plug, resulting in rapid failure and a short service life. The throttling process is also noisy and unstable. After rapid throttling, the spool and seat surfaces of the throttle valve are severely damaged, making it impossible to seal and fully close. Frequent replacement of the spool and seat is required, resulting in poor soft-starting and low efficiency. Summary of the Invention

[0003] In response to the deficiencies in the prior art, the present invention provides a cage-type erosion-resistant throttling plug double-acting valve, which solves the problem in the prior art that the throttle valve loses its sealing and fully closed function of the valve core and valve seat after rapid throttling, resulting in a short service life of the valve core and valve seat.

[0004] When unclamping said control button, under the effect of the compression spring and the bubble holding vessel internal pressure that shaves, combine closely in the interior edge of valve gap and sealing load chamber, and burble goes out control valve thereby control is shaved.

[0005] Preferably, an annular groove is provided in the middle of the throttle rod, and a throttle rod sealing ring is installed through the annular groove.

[0006] Preferably, a controller is fixedly provided above the throttle rod, and when the top end of the throttle rod contacts the bottom surface of the controller, the throttle rod and the cage-type cock are in a threaded fit state.

[0007] Preferably, an annular protrusion is coaxially fixed on the outer wall of the cage-type plug, a valve cover is mounted on the cage-type plug, the bottom of the valve cover is connected to the top surface of the sealing disk, the top and bottom of the annular protrusion are respectively connected to the plug upper buffer pad and the plug lower buffer pad, the annular protrusion is located in the annular cavity at the bottom of the valve cover, and the plug lower buffer pad contacts the bottom surface of the sealing disk, the plug upper buffer pad contacts the top surface of the annular cavity, and the valve cover is fixed to the valve body through a pressure cover.

[0008] Preferably, an inner sealing ring and an outer sealing ring are fixedly provided on the inner wall and the outer wall of the sealing disk respectively.

[0009] Preferably, the valve throttling holes are arranged from top to bottom.

[0010] Preferably, the top end of the cage-type cock is fixedly sleeved with a sheath, and is coaxially fixedly connected to a rotating head through the sheath.

[0011] Preferably, the top end of the throttle rod is coaxially fixedly connected with a control nut.

[0012] Preferably, one end of the downstream fluid channel of the valve seat is connected to the outer wall of the valve seat, and the top and bottom of the outer wall of the valve seat are respectively provided with a valve seat upper sealing strip and a valve seat lower sealing strip, and the valve seat upper sealing strip and the valve seat lower sealing strip are respectively located above and below the connecting end of the valve seat and the downstream fluid channel of the valve seat.

[0013] Preferably, the external end of the upstream fluid channel of the valve body is provided with an end connection sealing assembly, the inner ring of the end connection sealing assembly is provided with a sealing ring, and the external end of the downstream fluid channel of the valve body is fixedly provided with an end connection sleeve.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention comprises a high-strength cage-type plug, a valve seat, and a throttle rod for the upstream fluid channel and throttle hole. The throttle rod is raised and lowered to adjust the size of the throttle hole of the cage-type plug to achieve flow regulation. The cage-type plug is rotated within a 90° range and used in conjunction with the valve seat. The opening and closing of the valve is controlled by rotating the upstream fluid channel of the cage-type plug, thereby achieving highly integrated control of the opening and closing of the valve and the throttling of the fluid flow.

[0016] 2. Throttling is achieved when the valve is fully open. During throttling, high-speed fluid will not cause erosion to the plug hole.

[0017] 3. Compared with the needle throttle valve, the cage throttling is slow and stable, which will not cause serious damage to the valve core sealing surface and has a long service life. At the same time, the upper and lower cushions of the plug are configured to effectively reduce the throttling noise.

[0018] 4. Remote control can reduce the safety risk of high-pressure switch valves, and at the same time monitor the valve's switch status and throttling volume in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of an embodiment of the present invention.

[0020] Figure 2 for Figure 1 Sectional view of the AA plane.

[0021] Figure 3 for Figure 2 Cross-sectional view of the middle BB plane.

[0022] In the above drawings: 1. valve body; 2. valve seat; 3. caged plug; 4. sealing disc; 5. valve cover; 6. throttle rod; 7. gland; 8. swivel head; 9. control nut; 10. throttle rod sealing ring; 11. upper buffer pad of plug; 12. lower buffer pad of plug; 13. inner sealing ring of sealing disc; 14. outer sealing ring of sealing disc; 15. upper sealing strip of valve seat; 16. lower sealing strip of valve seat; 17. end connection block; 18. end connection sealing assembly; 19. sheath; 20. controller;

[0023] 1-1, upstream fluid channel of valve body; 1-2, valve cavity; 1-3, flow hole of valve body; 1-4, downstream fluid channel of valve body; 1-5, flow direction indicator of valve body; 2-1, fluid channel of valve seat; 3-1, upstream fluid channel of plug; 3-2, middle cavity of plug; 3-3, throttling hole of plug. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1-3As shown, in order to achieve the adjustable throttling of high-speed fluid when the valve is fully open to protect the valve hole from being eroded by high-speed fluid, and at the same time achieve complete sealing and closing of the valve after slow throttling to ensure the soft start of the pump, slow and stable throttling can avoid the generation of turbulence. The present invention proposes a cage-type erosion-resistant throttling valve, comprising a valve body 1 and a valve seat 2 vertically arranged on the top of the valve body 1, a continuous step is provided on the top of the valve seat 2, a cage-type valve 3 is coaxially rotated on the bottom of the continuous step, a throttling rod 6 is coaxially threaded on the top of the cage-type valve 3, a valve throttling hole 3-3 is provided on the inner wall of the cage-type valve 3, a valve cavity 1-2 connected to the valve throttling hole 3-3 is provided in the middle of the continuous step, and a sealing mechanism is provided on the top of the continuous step to seal the top of the valve cavity 1-2. Sealing disk 4, a valve body flow hole 1-3 communicating with the valve cavity 1-2 is provided inside the valve body 1, a valve body upstream fluid channel 1-1 and a valve body downstream fluid channel 1-4 are horizontally provided in the valve body 1, a valve seat fluid channel 2-1 communicating with the valve seat upstream fluid channel 1-1 is provided at the bottom of the valve seat 2, a plug upstream fluid channel 3-1 communicating with the interior of the cage type plug 3 and the valve seat fluid channel 2-1 is provided at the bottom of the cage type plug 3, and the valve body flow hole 1-3 is communicated with the valve body downstream fluid channel 1-4.

[0026] The throttling operation of the fully-open valve is as follows: the rotating head 8 is rotated to drive the cage-type plug 3 to rotate 90° counterclockwise, so that the center lines of the upstream fluid channel 1-1 of the valve body, the fluid channel 2-1 of the valve seat and the upstream fluid channel 3-1 of the plug are aligned. At this time, the valve is fully open, and the fluid flows through the valve body 1, the valve seat 2, and the cage-type plug 3 in sequence and then enters the plug middle cavity 3-2. The fluid enters the valve cavity 1-2 after throttling through the plug throttling hole 3-3, and then enters the valve body downstream fluid channel 1-4 and flows out through the valve body flow hole 1-3.

[0027] The valve slowly increases the throttling amount to fully closed to achieve the soft start process of the pump as follows: Turn the control nut 9 to drive the throttling rod 6 to rise and fall, adjust the overlap between the throttling rod 6 and the multiple throttling holes 3-3 of the plug, the greater the overlap, the greater the throttling amount, when the throttling rod 6 drops to the lowest position, the throttling holes 3-3 of the plug are completely blocked. At this time, the valve reaches the maximum throttling capacity, turn the rotating head 8 to drive the cage-type plug to rotate 90° clockwise, and the valve is completely closed.

[0028] like Figure 2 As shown, in order to improve the sealing performance between the throttle rod 6 and the cage-type cock 3, an annular groove is provided in the middle of the throttle rod 6, and a throttle rod sealing ring 10 is installed through the annular groove.

[0029] like Figure 1 and Figure 2As shown, in order to adjust the position of the throttle lever 6 and prevent the throttle lever 6 from being rotated too much and causing the threaded connection between the throttle lever 6 and the cage-type cock 3 to be lost, thereby causing fluid leakage when conveying high-speed fluid, a controller 20 is fixedly installed above the throttle lever 6. When the top end of the throttle lever 6 contacts the bottom surface of the controller 20, the throttle lever 6 and the cage-type cock 3 are in a threaded engagement state.

[0030] like Figure 2 As shown, in order to achieve shock absorption when the cage-type cock 3 is subjected to axial impact of high-speed fluid, an annular protrusion is coaxially fixed on the outer wall of the cage-type cock 3, and a valve cover 5 is mounted on the cage-type cock 3. The bottom of the valve cover 5 is connected to the top surface of the sealing disk 4, and the top and bottom of the annular protrusion are respectively connected to the cock upper buffer pad 11 and the cock lower buffer pad 12. The annular protrusion is located in the annular cavity at the bottom of the valve cover 5, and the cock lower buffer pad 12 contacts the bottom surface of the sealing disk 4, and the cock upper buffer pad 11 contacts the top surface of the annular cavity. The valve cover 5 is fixed to the valve body 1 through the pressure cover 7. The valve cover 5 is installed on the cage-type cock 3, and cooperates with the cock upper buffer pad 11 and the cock lower buffer pad 11 to reduce the impact of the annular protrusion, thereby improving the stability of the cage-type cock 3.

[0031] like Figure 2 As shown, in order to improve the sealing performance of the sealing disc 4 to the valve cavity 1-2, the inner wall and outer wall of the sealing disc 4 are respectively fixedly provided with a sealing disc inner sealing ring 13 and a sealing disc outer sealing ring 14.

[0032] like Figure 2 As shown, in order to improve the width and accuracy of throttling control, the throttle holes 3-3 of the plug are arranged from top to bottom. A large number of throttle holes 3-3 are provided. By vertically arranging the throttle holes 3-3, when the throttle rod 6 is rotated, the throttle rod 6 gradually covers the throttle holes 3-3 of the plug, thereby achieving the purpose of throttling adjustment.

[0033] like Figure 1 and Figure 2 As shown, in order to facilitate the rotation of the cage-type cock 3, a top end of the cage-type cock 3 is fixedly sleeved with a sheath 19, and a rotating head 8 is coaxially fixedly connected to the sheath 19.

[0034] like Figure 1 and Figure 2 As shown, for the convenience of rotating the throttle lever 6. The top end of the throttle lever 6 is coaxially fixedly connected with a control nut 9.

[0035] like Figure 2As shown, in order to enhance the sealing between the valve seat 2 and the valve body 1 and prevent the valve cavity 1-2 from communicating with the downstream fluid channel 1-4 of the valve seat, one end of the downstream fluid channel 1-4 of the valve seat is connected to the outer wall of the valve seat 2. The top and bottom of the outer wall of the valve seat 2 are respectively provided with a valve seat upper sealing strip 15 and a valve seat lower sealing strip 16. The valve seat upper sealing strip 15 and the valve seat lower sealing strip 16 are respectively located above and below the connection end between the valve seat 2 and the downstream fluid channel 1-4 of the valve seat. Figure 3 As shown, the valve body flow hole 1-3 is used to control the flow rate of the fluid, so it is necessary to ensure the relative sealing between the valve cavity 1-2 and the downstream fluid channel 1-4 of the valve seat.

[0036] like Figure 1-3 As shown, to enhance the sealing between the valve body's upstream fluid channel 1-1 and the external pipeline, the external connection end of the valve body's upstream fluid channel 1-1 is provided with an end connection sealing assembly 18, the inner ring of which is provided with a sealing ring. The external connection end of the valve body's downstream fluid channel 1-4 is fixedly provided with an end connection sleeve 17. Due to the throttling mode and the high pressure between the valve body's upstream fluid channel 1-1 and the external pipeline when the valve is fully closed, the end connection sealing assembly 18 is arranged to improve the sealing of the joint.

Claims

1. A cage-type erosion-resistant throttling plug double-acting valve, characterized by: The invention comprises a valve body (1) and a valve seat (2) vertically arranged on the top of the valve body (1), a continuous step is provided on the top of the valve seat (2), a cage-type cock (3) is coaxially rotated on the bottom of the continuous step, a throttling rod (6) is coaxially threadedly connected to the top of the cage-type cock (3), a cock throttling hole (3-3) is provided on the inner wall of the cage-type cock (3), a valve cavity (1-2) connected to the cock throttling hole (3-3) is provided in the middle of the continuous step, a sealing disc (4) is provided on the top of the continuous step for sealing the top of the valve cavity (1-2), and the inside of the valve body (1) is provided with a sealing disc (4) for sealing the top of the valve cavity (1-2). A valve body flow hole (1-3) communicating with the valve cavity (1-2) is provided, a valve body upstream fluid channel (1-1) and a valve body downstream fluid channel (1-4) are horizontally provided in the valve body (1), a valve seat fluid channel (2-1) communicating with the valve body upstream fluid channel (1-1) is provided at the bottom of the valve seat (2), a plug upstream fluid channel (3-1) communicating with the interior of the cage-type plug (3) and the valve seat fluid channel (2-1) is provided at the bottom of the cage-type plug (3), and the valve body flow hole (1-3) is communicated with the valve body downstream fluid channel (1-4).

2. A cage-type erosion-resistant throttling plug double-acting valve according to claim 1, characterized in that: An annular groove is provided in the middle of the throttle rod (6), and a throttle rod sealing ring (10) is installed through the annular groove.

3. A cage-type erosion-resistant throttling plug double-acting valve according to claim 1, characterized in that: A controller (20) is fixedly provided above the throttle rod (6), and when the top end of the throttle rod (6) contacts the bottom surface of the controller (20), the throttle rod (6) and the cage-type cock (3) are in a threaded engagement state.

4. A cage-type erosion-resistant throttling plug double-acting valve according to claim 1, characterized in that: An annular protrusion is coaxially fixedly provided on the outer wall of the cage-type plug (3), a valve cover (5) is mounted on the cage-type plug (3), the bottom of the valve cover (5) is connected to the top surface of the sealing disk (4), the top and bottom of the annular protrusion are respectively connected to the plug upper buffer pad (11) and the plug lower buffer pad (12), the annular protrusion is located in the annular cavity at the bottom of the valve cover (5), the plug lower buffer pad (12) contacts the bottom surface of the sealing disk (4), and the plug upper buffer pad (11) contacts the top surface of the annular cavity, and the valve cover (5) is fixed to the valve body (1) through the pressure cover (7).

5. A cage-type erosion-resistant throttling plug double-acting valve according to claim 4, characterized in that: The inner wall and outer wall of the sealing disk (4) are respectively fixedly provided with a sealing disk inner sealing ring (13) and a sealing disk outer sealing ring (14).

6. The cage-type erosion-resistant throttling plug double-acting valve according to claim 1, characterized in that: The cock throttle holes (3-3) are arranged from top to bottom.

7. The cage-type erosion-resistant throttling plug double-acting valve according to claim 1, characterized in that: The top end of the cage-type cock (3) is fixedly sleeved with a sheath (19), and is coaxially fixedly connected to a rotating head (8) via the sheath (19).

8. The cage-type erosion-resistant throttling plug double-acting valve according to claim 1, characterized in that: The top end of the throttle rod (6) is coaxially fixedly connected with a control nut (9).

9. The cage-type erosion-resistant throttling plug double-acting valve according to claim 1, characterized in that: One end of the downstream fluid channel (1-4) of the valve body is connected to the outer wall of the valve seat (2), and the top and bottom of the outer wall of the valve seat (2) are respectively provided with a valve seat upper sealing strip (15) and a valve seat lower sealing strip (16), and the valve seat upper sealing strip (15) and the valve seat lower sealing strip (16) are respectively located above and below the connection end between the valve seat (2) and the downstream fluid channel (1-4) of the valve body.

10. The cage-type erosion-resistant throttling plug double-acting valve according to claim 1, characterized in that: The external end of the upstream fluid channel (1-1) of the valve body is provided with an end connection sealing assembly (18), the inner ring of the end connection sealing assembly (18) is provided with a sealing ring, and the external end of the downstream fluid channel (1-4) of the valve body is fixedly provided with an end connection sleeve (17).

Images