Single-valve-seat sand-prevention large-drift-diameter high-pressure gate valve

Abstract

The utility model relates to the technical field of oil exploitation equipment, in particular to a sand prevention type large-drift-diameter high-pressure gate valve with a single valve seat. Comprising a valve body, flashboards and a valve rod. The valve body comprises a valve cavity, a fluid channel and two valve seat holes communicated with the fluid channel. Valve seats are arranged in a valve cavity of the valve body and located on the two end sides of the gate plate respectively. An annular sand baffle is arranged in the radial direction of the valve seat and close to the end part of the gate plate; a wave spring I is arranged between the valve seat and a fluid channel of the valve body. An annular supporting mechanism is arranged between the annular sand blocking plate and the valve body. An annular supporting mechanism is installed between an annular sand blocking plate and a valve body. The annular supporting mechanism is used for providing axial tensioning force for the annular sand blocking plate and the gate plate, and the sealing performance between the annular sand blocking plate and the gate plate is improved. And sand on the valve plate is prevented from entering the valve cavity through the hole when the flashboard ascends.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction equipment technology, and in particular to a single-seat sand-proof large-diameter high-pressure gate valve. Background Technology

[0002] In conventional shale gas extraction and fracturing technology, the gate valves commonly used in current applications require pressurized closure and are applied to fracturing sand and gravel of 200 mesh or even finer. High-pressure gate valves used in oil applications can operate at pressures ranging from 1.0 MPa to 105 MPa. After each fracturing operation, the gate valve needs to be greased to prevent fracturing sand from entering the valve cavity in subsequent operations. This operation affects fracturing efficiency, incurs significant maintenance costs, increases the workload of operators, and creates safety hazards on-site. Furthermore, throughout the operation, the valve body cavity remains connected to the fluid passage, with the pressurized medium filling the entire valve body cavity. This causes damage to the valve stem and stem seal, as well as corrosion of the valve body, affecting the free movement of the gate and seat, and ultimately impacting the normal opening and closing operation and lifespan of the gate valve.

[0003] Therefore, there is an urgent need to design a new type of gate valve that has sand-proof performance and is simple in structure and easy to operate. Utility Model Content

[0004] The purpose of this invention is to provide a single-seat sand-proof large-diameter high-pressure gate valve to solve the problem of easy entry of fracturing sand into the valve cavity, which leads to valve sealing failure.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model provides a single-seat sand-proof large-diameter high-pressure gate valve, including a valve body, a gate plate disposed in the valve cavity of the valve body, a valve stem connected to the upper end of the gate plate, and a lifting adjustment mechanism for adjusting the position of the valve stem;

[0007] The valve body includes a valve cavity, a fluid passage, and two valve seat holes respectively communicating with the fluid passage; wherein valve seats are respectively provided in the valve cavity of the valve body and at both ends of the gate; wherein an annular sand baffle is provided at the radial end of the valve seat and near the end of the gate;

[0008] A wave spring I is provided between the valve seat and the fluid passage of the valve body;

[0009] An annular support mechanism is provided between the annular sand baffle and the valve body; the axial end face of the annular sand baffle and the axial end face of the valve seat are smoothly transitioned.

[0010] In this embodiment, an upper flange is provided on the upper end face of the valve body by fasteners, and a lower flange is provided on the lower end face of the valve body by fasteners, the fasteners including bolts and nuts; the valve stem is connected to the upper end of the gate plate, and the valve stem is installed in the upper flange; a lower valve stem is connected to the lower end of the gate plate, and the lower valve stem is disposed in the lower flange.

[0011] Furthermore, in this embodiment, an axial annular groove is formed on the end face of the valve seat, and an axial O-ring is provided in the axial annular groove; a radial annular groove is formed on the outer peripheral wall of the valve seat, and a radial O-ring is provided in the radial annular groove.

[0012] An annular sand-blocking groove is provided at the connection between the valve seat and the fluid passage, and a sealing ring is provided in the annular sand-blocking groove.

[0013] Furthermore in this embodiment, both the axial O-ring and the radial O-ring are polymer retaining rings; the sealing retaining ring is made of wear-resistant stainless steel.

[0014] Furthermore in this embodiment, the outer diameter of the annular sand baffle extends into the cavities of the upper flange and the lower flange.

[0015] Furthermore in this embodiment, the annular support mechanism between the annular sand baffle and the valve body is a wave spring II, and an annular groove for assembling the wave spring II is provided on the valve body.

[0016] Furthermore, in this embodiment, an annular groove is formed on the valve body near the end face of the annular baffle plate, and an annular support mechanism is provided in the annular groove. The annular support mechanism includes a hydraulic annular cavity assembled in the annular groove and a support ring located between the hydraulic annular cavity and the annular baffle plate. A hydraulic oil pipe communicating with the hydraulic annular cavity is also formed in the valve body. The hydraulic oil pipe is connected to a hydraulic pump station through an oil inlet interface.

[0017] In this embodiment, the lifting and adjusting mechanism is a hydraulic cylinder or a worm gear motor that drives the valve stem to lift and lower.

[0018] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0019] In this invention, an annular support mechanism is installed between the annular sand baffle and the valve body; the annular support mechanism provides axial tension force to the annular sand baffle and the gate, improving the sealing between them; preventing sand from entering the valve cavity through the hole on the valve plate when the gate rises; the axial end face of the annular sand baffle and the axial end face of the valve seat have a smooth transition to prevent interference with the raising and lowering of the gate. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the main body of Example 1;

[0022] Figure 2 for Figure 1 Enlarged view of a portion of the image;

[0023] Figure 3 This is a schematic diagram of the main body of Example 2;

[0024] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0025] Explanation of reference numerals in the attached drawings: 1. Valve body; 11. Annular sand-blocking groove; 2. Valve seat; 21. Axial O-ring; 22. Radial O-ring; 23. Wave spring I; 3. Gate; 4. Valve stem; 5. Annular sand-blocking plate; 6. Wave spring II; 7. Hydraulic annular cavity; 71. Support ring; 8. Hydraulic oil pipe; 81. Oil inlet port. Detailed Implementation

[0026] Example 1

[0027] refer to Figure 1 This embodiment discloses a single-seat sand-resistant large-diameter high-pressure gate valve, including a valve body 1, a gate 3 installed in the valve cavity of the valve body 1, a valve stem 4 connected to the upper end of the gate 3, and a lifting adjustment mechanism for adjusting the position of the valve stem 4; the valve body 1 includes a valve cavity, a fluid channel, and two valve seat holes respectively communicating with the fluid channel; wherein valve seats 2 are respectively installed in the valve cavity of the valve body 1 and located at both ends of the gate 3; wherein an annular sand baffle 5 is installed in the radial direction of the valve seat 2 and near the end of the gate 3; the lifting adjustment mechanism is a hydraulic cylinder or a worm gear motor that drives the valve stem 4 to rise and fall.

[0028] A wave spring I23 is installed between the valve seat 2 and the fluid passage of the valve body 1; the wave spring I23 provides a preload force between the valve seat 2 and the gate 3, thereby improving the sealing performance between the valve seat 2 and the gate 3.

[0029] An annular support mechanism is installed between the annular sand baffle 5 and the valve body 1; the annular support mechanism provides axial tension force to the annular sand baffle 5 and the gate 3, improving the sealing between them; preventing sand from entering the valve cavity through the hole on the valve plate 3 when the gate 3 rises; the axial end face of the annular sand baffle 5 and the axial end face of the valve seat 2 smoothly transition to prevent interference with the raising and lowering of the gate 3.

[0030] refer to Figure 1 In this embodiment, an upper flange is provided on the upper end face of the valve body 1 by means of fasteners, and a lower flange is provided on the lower end face of the valve body 1 by means of fasteners, the fasteners including bolts and nuts; the valve stem 4 is connected to the upper end of the gate plate 3, and the valve stem 4 is installed in the upper flange; a lower valve stem is connected to the lower end of the gate plate 3, and the lower valve stem is disposed in the lower flange.

[0031] refer to Figure 1 and Figure 2 An axial annular groove is formed on the end face of the valve seat 2, and an axial O-ring 21 is installed in the axial annular groove; a radial annular groove is formed on the outer peripheral wall of the valve seat 2, and a radial O-ring 22 is installed in the radial annular groove; both the axial O-ring 21 and the radial O-ring 22 are polymer retaining rings; an annular sand-blocking groove 11 is also formed at the connection between the valve seat 2 and the fluid channel, and a sealing retaining ring is installed in the annular sand-blocking groove 11; the sealing retaining ring is made of wear-resistant stainless steel; specifically, it can be austenitic stainless steel or martensitic stainless steel.

[0032] In this embodiment, the outer diameter of the annular sand baffle 5 extends into the cavities of the upper flange and the lower flange; wherein the annular sand baffle 5 prevents sand from entering the valve cavity, thereby further improving the sealing performance of the valve seat.

[0033] In this embodiment, the annular support mechanism between the annular sand baffle 5 and the valve body 1 is a wave spring II 6, and an annular groove for assembling the wave spring II 6 is provided on the valve body 1; specifically, the wave spring II 6 is used to provide axial tension force to the annular sand baffle 5 and the gate 3 to improve the sealing between them.

[0034] Example 2

[0035] Based on Example 1, and referring to Figure 3 and Figure 4An annular groove is provided on the valve body 1 near the end face of the annular baffle plate 5. An annular support mechanism is provided in the annular groove. The annular support mechanism includes a hydraulic annular cavity 7 assembled in the annular groove and a support ring 71 located between the hydraulic annular cavity 7 and the annular baffle plate 5. A hydraulic oil pipe 8 is also provided in the valve body 1 to communicate with the hydraulic annular cavity 7. The hydraulic oil pipe 8 is connected to the hydraulic pump station through an oil inlet port 81. The working pressure of the high-pressure gate valve for petroleum applications can range from 1.0 MPa to 105 MPa. In this embodiment, hydraulic oil with a pressure balanced with the working pressure of the high-pressure gate valve can be supplied to the hydraulic annular cavity 7 via the hydraulic oil pipe 8. During use, the hydraulic annular cavity 7 is connected to the hydraulic station via two hydraulic oil pipes 8, which serve as the inlet and return oil pipes, respectively. A solenoid valve is designed on the oil supply pipe of the hydraulic station. When the gate 3 needs to be raised by adjusting the valve body 1, the hydraulic station supplies hydraulic oil to the oil supply pipe through the controller to effectively support the annular baffle 5. Specifically, the hydraulic annular cavity 7 is made of a high-pressure resistant elastic material, specifically one of perfluororubber, fluororubber, and polytetrafluoroethylene.

[0036] In this embodiment, the hydraulic annular cavity 7 is supplied with oil by a hydraulic pump station, and then the hydraulic annular cavity 7 is used as a support ring 71 to push the annular sand baffle 5, providing axial tension force for the annular sand baffle 5 and the gate 3, improving the sealing between the two, and preventing sand from entering the valve cavity when the gate 3 is raised or lowered.

[0037] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A single-seat sand-resistant, large-diameter, high-pressure gate valve, characterized in that: It includes a valve body, a gate plate disposed in the valve cavity of the valve body, a valve stem connected to the upper end of the gate plate, and a lifting adjustment mechanism for adjusting the position of the valve stem; The valve body includes a valve cavity, a fluid passage, and two valve seat holes respectively communicating with the fluid passage; wherein valve seats are respectively provided in the valve cavity of the valve body and at both ends of the gate; wherein an annular sand baffle is provided at the radial end of the valve seat and near the end of the gate; A wave spring I is provided between the valve seat and the fluid passage of the valve body; An annular support mechanism is provided between the annular sand baffle and the valve body; the axial end face of the annular sand baffle and the axial end face of the valve seat are smoothly transitioned.

2. The single-seat sand-resistant large-diameter high-pressure gate valve according to claim 1, characterized in that: An upper flange is provided on the upper end face of the valve body by fasteners, and a lower flange is provided on the lower end face of the valve body by fasteners, the fasteners including bolts and nuts; the valve stem is connected to the upper end of the gate plate, and the valve stem is installed in the upper flange; a lower valve stem is connected to the lower end of the gate plate, and the lower valve stem is disposed in the lower flange.

3. The single-seat sand-resistant large-diameter high-pressure gate valve according to claim 2, characterized in that: An axial annular groove is formed on the end face of the valve seat, and an axial O-ring is provided in the axial annular groove; a radial annular groove is formed on the outer peripheral wall of the valve seat, and a radial O-ring is provided in the radial annular groove. An annular sand-blocking groove is provided at the connection between the valve seat and the fluid passage, and a sealing ring is provided in the annular sand-blocking groove.

4. The single-seat sand-resistant large-diameter high-pressure gate valve according to claim 3, characterized in that: Both the axial O-ring and the radial O-ring are polymer retaining rings; the sealing retaining ring is made of wear-resistant stainless steel.

5. The single-seat sand-resistant large-diameter high-pressure gate valve according to claim 4, characterized in that: The outer diameter of the annular sand baffle extends into the cavities of the upper flange and the lower flange.

6. The single-seat sand-resistant large-diameter high-pressure gate valve according to claim 5, characterized in that: The annular support mechanism between the annular baffle plate and the valve body is a wave spring II, and an annular groove for assembling the wave spring II is provided on the valve body.

7. The single-seat sand-resistant large-diameter high-pressure gate valve according to claim 6, characterized in that: An annular groove is formed on the valve body near the end face of the annular baffle plate. An annular support mechanism is provided in the annular groove. The annular support mechanism includes a hydraulic annular cavity assembled in the annular groove and a support ring located between the hydraulic annular cavity and the annular baffle plate. A hydraulic oil pipe communicating with the hydraulic annular cavity is also formed in the valve body. The hydraulic oil pipe is connected to a hydraulic pump station through an oil inlet interface.

8. The single-seat sand-resistant large-diameter high-pressure gate valve according to claim 7, characterized in that: The lifting and adjusting mechanism is a hydraulic cylinder or a worm gear motor that drives the valve stem to lift and lower.

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