Cage sleeve type throttle valve with cut-off function

Abstract

The utility model relates to a cage sleeve type throttle valve with a stop function. The cage sleeve type throttle valve is mainly composed of a valve body, a valve cover, a valve rod, a valve seat, a valve element and a cage sleeve body with stepped throttle holes. A metal sealing cone structure in floating connection is adopted, a cone frustum with the outer diameter gradually reduced is connected with the bottom of a valve rod through a floating bolt, the sealing cone is allowed to adjust the position in a self-adaptive mode, and it is ensured that the sealing cone is tightly attached to a chamfer at the top of a valve element hole. And when closed, the cage sleeve body sinks to form a throttling gap, and meanwhile, the metal sealing cone is guided by the conical surface to achieve hard sealing. The valve integrates throttling and stopping functions, has the advantages of being reliable in sealing, convenient and fast to operate, long in service life and the like, and is particularly suitable for oil and gas wellhead devices needing the emergency cut-off function.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas extraction equipment technology, specifically to a cage-type throttle valve with a shut-off function. Background Technology

[0002] In the oil and gas extraction field, choke valves are key equipment for controlling wellhead pressure and regulating production. Currently, commonly used choke valves have two main technical drawbacks: first, they only have flow regulation functions and cannot achieve complete shut-off, so there is still a risk of leakage during emergency well shut-in; second, they require an additional independent shut-off valve, which increases equipment costs by more than 30% and prolongs operation response time.

[0003] While some existing technologies attempt to integrate shut-off functions into throttle valves, their soft-seal structures experience rapid performance degradation under high-pressure (>35MPa) and high-sand-content (>3%) conditions, resulting in an average service life of less than 1000 switching cycles. Especially in harsh conditions such as deep-sea oil and gas wells and high-pressure gas wells, the insufficient shut-off reliability of traditional throttle valves has become a significant bottleneck restricting safe production. Furthermore, the remote control functions of existing equipment are limited to flow regulation, failing to meet the rapid response requirements for emergency shut-off, which to some extent increases well control risks. Utility Model Content

[0004] In view of the problems and shortcomings of the existing technology, this utility model provides a cage-type throttle valve with a shut-off function.

[0005] The technical solution of this utility model is as follows:

[0006] A cage-type throttle valve with a shut-off function includes a valve body, a valve cover, a valve stem, a valve seat, a valve core, and a cage body. The lower inner ring of the cage body fits with the upper part of the outer ring of the valve core. The cage body is provided with multiple stepped throttle holes, the diameter of which gradually decreases along the fluid direction.

[0007] A metal sealing cone is connected to the bottom of the valve stem by a floating bolt. The metal sealing cone is a truncated cone with a gradually decreasing outer diameter. The upper part fits against the bottom of the valve stem, and the cone surface is chamfered to fit the top of the valve core hole. A countersunk hole is provided in the center, and the floating bolt passes through the countersunk hole to connect to the valve stem.

[0008] The floating bolts allow the metal sealing cone to move up, down, left, and right, ensuring that the bottom of the metal sealing cone fits tightly against the sealing surface of the valve core.

[0009] When the valve is opened, rotating the handwheel causes the valve stem to rise via the valve stem nut, gradually exposing the throttling orifice of the cage body, thus regulating the flow rate. When the valve is closed, the cage body sinks into the valve body to form a throttling gap, while the metal sealing cone, guided by its bottom conical surface, tightly engages with the valve core hole to form a seal.

[0010] In one embodiment, the metal sealing cone is made of a nickel-based hard alloy material.

[0011] In another embodiment, a nickel-based hard alloy layer is deposited on the conical surface of the metal sealing cone.

[0012] The cone angle between the metal sealing cone and the valve core contact surface is 15-30 degrees.

[0013] Preferably, the floating bolts are made of Inconel 718 material.

[0014] A cage-type throttle valve with a shut-off function also includes an opening indicator mechanism, a handwheel, and a valve stem nut. The upper part of the valve stem is connected to the handwheel through the valve stem nut. The handwheel is used to control the lifting and lowering of the cage body. An opening indicator mechanism for displaying the valve opening is provided above the handwheel.

[0015] The valve body is equipped with a pressure relief device.

[0016] A cage-type throttle valve with a shut-off function also includes a remote control module, which includes an electric actuator and a position sensor, enabling remote control and status monitoring of the valve.

[0017] The beneficial effects of this utility model are:

[0018] This invention innovatively integrates throttling and shut-off functions into a single valve. Through the precise fit between the metal sealing cone and the valve seat, zero leakage is ensured even under 70MPa high pressure conditions, significantly improving the reliability and safety of the equipment. The unique floating bolt design allows the sealing cone to adaptively adjust its position, effectively compensating for machining errors and thermal deformation, and significantly enhancing the fit of the sealing surface. This structure simplifies the configuration of the wellhead piping, reducing equipment costs by more than 30% while saving 40% of installation space. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the valve in the open state of an embodiment.

[0020] Figure 2 This is a schematic diagram of the valve in the closed state as shown in the embodiment.

[0021] The components represented by the reference numerals in the diagram are:

[0022] 1. Opening indicator mechanism; 2. Handwheel; 3. Grease plug; 4. Valve cover; 5. Valve stem nut; 6. Guide block; 7. Valve stem; 8. Valve stem sealing ring; 9. Cage body; 10. Metal sealing cone; 11. Pressure relief valve; 12. Valve body; 13. Floating bolt; 14. Valve seat; 15. Valve core. Detailed Implementation

[0023] The technical means adopted to achieve the intended purpose of this utility model will be further described below with reference to the accompanying drawings of the embodiments of this utility model.

[0024] Example 1

[0025] See Figure 1 and Figure 2 A cage-type throttle valve with a shut-off function includes a valve body 12, a valve cover 4, a valve stem 7, a valve seat 14, a valve core 15, and a cage body 9. The lower inner ring of the cage body 9 is fitted with the upper outer ring of the valve core 15. The cage body 9 is provided with multiple stepped throttle holes with the hole diameter gradually decreasing along the fluid direction.

[0026] The bottom of the valve stem 7 is connected to a metal sealing cone 10 by a floating bolt 13. The metal sealing cone 10 is a truncated cone with a gradually decreasing outer diameter. The upper part fits against the bottom of the valve stem 7, and the cone surface is chamfered to fit the top of the valve core hole. A countersunk hole is provided in the center, and the floating bolt 13 passes through the countersunk hole to connect with the valve stem.

[0027] The floating bolt 13 allows the metal sealing cone 10 to move up, down, left, and right, ensuring that the bottom of the metal sealing cone 10 is in close contact with the sealing surface of the valve core 15.

[0028] See Figure 1 When the valve is opened, rotating the handwheel 2 drives the valve stem 7 to rise through the valve stem nut 5, gradually exposing the throttling orifice of the cage body 9, thereby achieving flow regulation.

[0029] See Figure 2 When the valve is closed, the cage body 9 sinks into the valve body 12 to form a throttling gap, and at the same time, the metal sealing cone 10, guided by the bottom cone surface, tightly fits with the valve core 15 hole to form a metal hard seal.

[0030] Specifically, the valve body 12 is forged from high-strength alloy steel and undergoes precision machining and heat treatment. The internal cavity of the valve body 12 is designed with a stepped flow channel, with the inlet diameter larger than the outlet diameter. A standard flange connection interface is provided at the bottom of the valve body 12. The valve seat 14 is made of precipitation-hardened stainless steel and is fixed inside the valve body 12. The lower part of the valve core 15 is fixed to the valve seat 14, and the top of the valve core 15 is machined with a precision tapered connecting hole, the tapered surface of which is ground and polished.

[0031] The upper part of the valve stem 7 is machined with a trapezoidal thread, and the valve stem nut 5 is made of copper alloy. The valve cover 4 is connected to the valve body 12 by high-strength bolts, and the clearance between it and the valve stem 7 is 0.1-0.2mm to ensure the linear movement accuracy of the valve stem 7. The handwheel 2 is connected and fixed to the top of the valve stem 7. An opening indicator mechanism 1 with a pointer design is provided above the handwheel 2.

[0032] The cage body 9 is machined with throttling holes. The hole spacing and diameter are optimized by CFD to achieve linear flow characteristics and minimal flow noise.

[0033] In one embodiment, the metal sealing cone 10 is made of nickel-based hard alloy material with a hardness of HRC55 or higher. The preferred cone angle is 20 ± 0.5 degrees, precisely matching the cone bore of the valve seat 14. This ensures wear resistance and corrosion resistance. Furthermore, the sealing surface is ultra-precision ground to guarantee a tight seal.

[0034] Preferably, the cone angle of the contact surface between the metal sealing cone 10 and the valve core 15 is 15-30 degrees.

[0035] The floating bolt 13 is made of Inconel 718 material, and the threaded part is surface-strengthened to allow the metal sealing cone 10 to float radially and axially, preferably within the range of ±1mm radially and ±0.5mm axially. This design can effectively compensate for machining errors and thermal deformation, and ensure the self-adaptive fit of the sealing surface.

[0036] See Figure 1 and Figure 2 A cage-type throttle valve with a shut-off function also includes an opening indicator mechanism 1, a handwheel 2, and a valve stem nut 5. The upper part of the valve stem 7 is connected to the handwheel 2 through the valve stem nut 5. The handwheel 2 is used to control the lifting and lowering of the cage body 9. An opening indicator mechanism 1 for displaying the valve opening is provided above the handwheel 2.

[0037] The valve cover 4 is equipped with a valve stem sealing ring 8 and a grease plug 3. The valve body 12 is equipped with a pressure relief valve 11. The sealing ring 8, the grease plug 3, and the pressure relief valve 11 are all existing technologies and will not be described in detail here.

[0038] For applications requiring remote control, a remote control module consisting of an electric actuator and a position sensor can be installed. The actuator thrust must meet the maximum operating torque requirement to enable rapid shutdown. The modular design facilitates the installation of electric actuators and sensors, enabling remote control with a 3-5 second rapid shutdown capability, providing strong protection for the safe production of oil and gas wells.

[0039] The working process of this utility model is as follows:

[0040] Figure 1 See, valve open state:

[0041] When the valve needs to be opened, turn the handwheel 2 clockwise, which converts the rotational motion into the linear upward motion of the valve stem 7 via the valve stem nut 5. Guided by the guide block 6, the valve stem 7 maintains a strictly vertical trajectory. As the valve stem 7 rises, the metal sealing cone 10, connected by the floating bolt 13, is lifted and gradually disengages from contact with the valve core 15. Simultaneously, the cage body 9 rises along with the valve stem 7, gradually exposing the throttling orifice on the cage body 9.

[0042] Fluid enters from the valve inlet and first passes through a large-diameter throttling orifice on the cage body 9, where the pressure is initially reduced. Then, it passes through gradually decreasing-diameter throttling orifices, achieving multi-stage pressure reduction. By precisely controlling the rotation angle of the handwheel 2, the rising height of the cage body 9 can be adjusted, thereby changing the effective throttling area and achieving precise flow control. The opening indicator mechanism 1 displays the valve opening position in real time.

[0043] See Figure 2 Valve closing and shut-off process:

[0044] When the valve needs to be closed, turn handwheel 2 counterclockwise, and valve stem 7 begins to move downwards. The closing process consists of two stages:

[0045] Phase 1: The cage 9 begins to sink into the valve body 12, forming a 0.2-0.3mm annular gap with the inner wall of the valve body 12. At this time, the fluid passing through this tiny gap produces a significant throttling and pressure-reducing effect, and the flow velocity decreases, preparing for the subsequent complete shut-off.

[0046] Second stage: As the valve stem 7 continues to move downward, the lower conical surface of the metal sealing cone 10 gradually approaches the conical hole of the valve seat 14. When the sealing specific pressure reaches the design value (30-50MPa), a metal-to-metal hard seal is formed, achieving complete shut-off.

[0047] Emergency shut-off function: In emergency situations, the emergency shut-off procedure can be initiated by quickly rotating handwheel 2 or by triggering the electric actuator. Due to the direct action of the metal sealing cone 10, the system can achieve initial sealing, with a response speed significantly faster than traditional valves. This rapid shut-off capability is particularly important in emergencies such as well blowouts, buying valuable time for rescue operations.

[0048] Example 2

[0049] In another specific embodiment, a nickel-based hard alloy layer is welded onto the conical surface of the metal sealing cone 10. This is used to improve the wear resistance and corrosion resistance of the metal sealing cone. Except for the metal sealing cone, the structure of the sleeve-type throttle valve with a shut-off function in this embodiment is the same as in Embodiment 1 and will not be described again here.

Claims

1. A cage sleeve type throttling valve with a shut-off function, comprising a valve body (12), a valve cover (4), a valve stem (7), a valve seat (14), a valve core (15) and a cage sleeve body (9), the lower inner ring of the cage sleeve body (9) is matched with the upper part of the outer ring of the valve core (15), and a plurality of stepped throttling holes are arranged on the cage sleeve body (9), the hole diameter of the throttling holes gradually decreases along the fluid direction. Characterized in that: A metal sealing cone (10) is connected to the bottom of the valve stem (7) through a floating bolt (13), the metal sealing cone (10) is a tapered table with a gradually reduced outer diameter, the upper part is in close contact with the bottom of the valve stem (7), the tapered surface is matched with the chamfer at the top of the valve core hole, a countersunk hole is arranged in the center, and the floating bolt (13) is connected with the valve stem through the countersunk hole; The floating bolt (13) allows the metal sealing cone (10) to move up and down and left and right, ensuring that the bottom of the metal sealing cone (10) is in close contact with the sealing surface of the valve core (15); When the valve is opened, the rotating hand wheel (2) drives the valve stem (7) to rise through the valve stem nut (5), so that the throttling holes of the cage sleeve body (9) are gradually exposed, and flow regulation is realized; When the valve is closed, the cage sleeve body (9) sinks into the valve body (12) to form a throttling gap, and at the same time, the metal sealing cone (10) is in close contact with the hole of the valve core (15) under the guidance of the bottom tapered surface, forming a seal.

2. The cage-sleeve type throttle valve with a cut-off function according to claim 1, characterized by The metal sealing cone (10) is made of nickel-based hard alloy material.

3. The cage-sleeve type throttle valve with a cut-off function according to claim 1, characterized by A layer of nickel-based hard alloy is deposited on the tapered surface of the metal sealing cone (10).

4. The cage-sleeve type throttle valve with a cut-off function according to claim 1, characterized by The taper angle of the contact surface between the metal sealing cone (10) and the valve core (15) is 15-30 degrees.

5. The cage-sleeve type throttle valve with a cut-off function according to claim 1, characterized by The floating bolt (13) is made of Inconel 718 material.

6. The cage-in-cage type throttle valve with a cut-off function according to any one of claims 1 to 4, characterized by, It also includes an opening indicating mechanism (1), a hand wheel (2) and a valve stem nut (5), the upper part of the valve stem (7) is connected with the hand wheel (2) through the valve stem nut (5), the hand wheel (2) is used for controlling the lifting of the cage sleeve body (9), and an opening indicating mechanism (1) for displaying the opening of the valve is arranged above the hand wheel.

7. The cage-in-cage type throttle valve with a cut-off function according to claim 1, characterized by, The valve body (12) is provided with a pressure relief valve (11).

8. The cage-in-sleeve type throttle valve with a cut-off function according to claim 1, characterized by It also includes a remote control module, the remote control module includes an electric actuator and a position sensor, and remote control and state monitoring of the valve can be realized.

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