Petroleum industry gate valve with valve seat convenient to replace

Abstract

The utility model discloses a petroleum industry gate valve with a valve seat convenient to replace, which relates to the field of petroleum industry gate valves, and is characterized by comprising a valve body and a valve rod supporting part which are connected through a flange, a valve rod is arranged on the valve rod supporting part, and the bottom of the valve rod is connected with the valve seat through a quick release assembly. The quick-release assembly fixes the valve seat in a mode of first limiting and then fixing, and the quick-release assembly has the advantages that when the valve seat is damaged and needs to be detached, flange fixation between the valve body and the valve rod supporting part is removed, the valve rod supporting part is detached from the valve body, then the valve seat can be pulled out of the valve body, and then fixation of the quick-release assembly to the valve seat is removed; the damaged valve seat is detached, then a new valve seat is installed, the valve seat is installed in the mode that the valve seat is limited firstly and then fixed through the quick detaching assembly, the valve seat does not need to be frequently held by hands, more convenience is achieved, tools in the background technology do not need to be used, and the convenience degree of replacement of the valve seat is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of petroleum industry gate valve, more specifically, it relates to a petroleum industry gate valve convenient for valve seat replacement. BACKGROUND

[0002] The petroleum industry gate valve is a key cutting device specially designed for petroleum, natural gas and other medium conveying, and the core function is realized by the vertical movement of the gate plate to open and close the pipeline, which is a control element in the petroleum fluid conveying process, and its main function is to isolate the equipment and the pipeline system to achieve the functions of regulating flow, preventing backflow, regulating and draining pressure, and the valve seat (also called sealing valve seat) is a part that opens and closes the valve to control the state of the valve, which is connected with the valve rod.

[0003] In the petroleum industry gate valve, the valve seat as the core sealing component is subjected to multiple tests of medium scouring, particle wear and corrosive environment for a long time, resulting in gradual failure of its sealing performance. The specific performance is that when the high-speed flowing petroleum medium (containing sand particles, sulfides and other impurities) continuously impacts the valve seat sealing surface, mechanical erosion and wear will occur, and the originally smooth sealing interface will appear pits or grooves. At the same time, the high temperature and high pressure environment aggravates the fatigue loss of the material, combined with the chemical corrosion effect of the corrosive medium, resulting in intergranular corrosion or stress corrosion cracking of the valve seat material (such as ordinary alloy steel). The traditional valve seat is fixed with the valve rod by welding or integral casting, which needs to use cutting tools and hydraulic pulling tools to disassemble the valve seat, and then install the new valve seat by welding or interference fit. The worker needs to hold the valve seat during the installation process, which is very troublesome.

[0004] Therefore, in order to solve the above technical problems, the petroleum industry gate valve convenient for valve seat replacement is provided. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a petroleum industry gate valve convenient for valve seat replacement.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a petroleum industry gate valve convenient for valve seat replacement, comprising a valve body and a valve rod support part, which are connected by a flange, the valve rod support part is provided with a valve rod, the bottom of the valve rod is connected with a valve seat through a quick release assembly, and the quick release assembly fixes the valve seat by limiting first and then fixing.

[0007] Preferably, a flange A is arranged at the connecting position of the valve body, a flange B is arranged at the connecting position of the valve body, the flange A and the flange B are fixed by bolts, square grooves A are arranged at the top of the flange A, and square blocks A matching the square grooves A are arranged at the bottom of the flange B.

[0008] Preferably, annular grooves are further arranged at the top of the flange A, sealing gaskets are arranged on the inner side walls of the annular grooves, and an annular block is fixedly connected to the bottom end of the flange B.

[0009] Preferably, the quick release assembly comprises a connecting block to which the bottom of the valve rod is arranged, an upper open groove seat matching the connecting block is fixedly connected to the top end of the valve seat, square grooves B are arranged at the two sides of the connecting block, and square through grooves matching the square grooves B are arranged at the two sides of the upper open groove seat.

[0010] Preferably, telescopic rods are fixedly connected to the two sides of the surface of the upper open groove seat, the heads of the telescopic rods are fixedly connected to movable plates, through holes A are arranged at the two sides of the surface of the movable plates, screws are fixedly connected to the positions matching the through holes A on the surface of the upper open groove seat, nuts are threadedly connected to the outer side walls of the screws, and square protrusions B are fixedly connected to the surface of the movable plates facing the upper open groove seat.

[0011] Preferably, the connecting block is detachably connected to the bottom of the valve body, and when the connecting block is damaged and affects the installation of the valve seat, the connecting block can be replaced from the valve rod.

[0012] Preferably, a plurality of screw holes are arranged in a circumferential array at the position close to the bottom end of the outer side wall of the valve rod, a cylindrical groove seat capable of being inserted into the bottom of the valve rod is fixedly connected to the top end of the connecting block, and a plurality of through holes B are arranged in a circumferential array on the outer side wall of the cylindrical groove seat.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1、when the valve seat needs to be disassembled due to damage, the flange fixing between the valve body and the valve rod supporting part is released, the valve rod supporting part is disassembled from the valve body, the valve seat can be pulled out of the valve body, then the fixing of the quick release assembly to the valve seat is released, the damaged valve seat is disassembled, a new valve seat is installed, the valve seat is installed by the way of first limiting and then fixing of the quick release assembly, the valve seat does not need to be frequently held by hand, it is more convenient, and the tool in the background technology does not need to be used, the convenience of valve seat replacement is greatly improved, so that the problem that the valve seat needs to be disassembled by using a wrench and other tools, and then a new valve seat is installed by welding or interference fit, the valve seat needs to be held by a worker during installation, and the operation is very troublesome is solved.

[0015] 2, the utility model discloses a square block A is inserted into square recess A's mode to guide flange B and flange A to find the installation position of flange B relative to flange A quickly.

[0016] 3, the utility model discloses that the top of flange A still is provided with annular recess, and the inboard wall of annular recess is bonded with sealing gasket, and the bottom of flange B is fixedly connected with annular block, so that through the recess and protrusion cooperation mode, the contact stress of sealing gasket is concentrated on the interface of annular recess and annular block, compared with the full plane contact of plane flange, can realize higher sealing specific pressure with smaller contact area, thereby the sealing effect of flange connection is improved significantly. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the utility model and constitute a part of this application, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model and do not constitute improper limitation to the utility model. In the drawings:

[0018] Figure 1 It is overall structure schematic diagram of the utility model;

[0019] Figure 2 It is A partial structure enlarged view of the utility model; Figure 1

[0020] Figure 3 It is another angle specific structure schematic diagram of the utility model; Figure 1

[0021] Figure 4 It is structure schematic diagram when valve rod is not connected valve seat in the utility model;

[0022] Figure 5 It is specific structure schematic diagram of quick release assembly in the utility model.

[0023] In the drawing: 1, valve body;2, valve rod support part;3, valve rod;4, quick release assembly;401, connecting block;402, upper open slot seat;403, square recess B;404, square through slot;405, telescopic rod;406, through hole A;407, screw;408, square protruding block B;409, movable plate;5, valve seat;6, flange A;7, flange B;8, square recess A;9, square block A;10, annular recess;11, annular block;12, screw hole;13, cylindrical slot seat;14, through hole B. DETAILED DESCRIPTION

[0024] As Figures 1-5 ​​The utility model provides a petroleum industry gate valve convenient to change valve seat, including valve body 1 and valve rod support part 2, both are connected through flange, be provided with valve rod 3 on valve rod support part 2, the bottom of valve rod 3 is connected with valve seat 5 through quick release assembly 4, and quick release assembly 4 fixes valve seat 5 through the mode of first limiting then fixed (need to explain the utility model focuses on describing the convenient replacement of valve seat 5, the parts irrelevant with the utility model on part gate valve have not been drawn, for example, valve plate, sealing component on valve seat 5 etc., valve seat 5 is below through the sealing ring and valve plate sliding fit, realizes medium cut-off).

[0025] When valve seat 5 needs to be disassembled when damage occurs, the flange fixing between valve body 1 and valve rod support part 2 is released, valve rod support part 2 is disassembled from valve body 1, valve seat 5 can be pulled out from valve body 1, then the fixing of quick release assembly 4 to valve seat 5 is released, the damaged valve seat 5 is disassembled, and a new valve seat 5 is installed, the valve seat 5 is installed through the mode of first limiting then fixed of quick release assembly 4, the valve seat 5 need not be held frequently, it is more convenient, and the tool described in the background art need not be used, the convenience degree of valve seat 5 replacement is greatly improved.

[0026] The specific structure of quick release assembly 4 is as follows: quick release assembly 4 includes connecting block 401 to which the bottom of valve rod 3 is mounted, the top end of valve seat 5 is fixedly connected with upper open slot seat 402 matched with connecting block 401, square recess B 403 is formed in the two sides of connecting block 401, square through slot 404 flush with square recess B 403 is formed in the two sides of upper open slot seat 402, and telescopic rod 405 is fixedly connected to the head of connecting block 401 and fixedly connected to the head of connecting block 401, and the surface of upper open slot seat 402 is fixedly connected with square through slot 404 on both sides of square through slot 404, and the surface of upper open slot seat 402 is fixedly connected with screw 407 flush with through hole A 406, and screw 407 is fixedly connected with nut on the outer side wall, and square protruding block B 408 is fixedly connected to the surface of upper open slot seat 402.

[0027] When installing, the upper open slot seat 402 on the valve seat 5 is inserted into the square protrusion B408 at the bottom of the valve stem 3, after the insertion, the square protrusion B408 on the movable plate 409 is aligned with the square through slot 404 and the square recess B403, the movable plate 409 is pushed to move in the direction of the upper open slot seat 402, the telescopic rod 405 is shortened to keep the straight movement of the movable plate 409, the movable plate 409 drives the movement of the square protrusion B408 to pass through the square through slot 404 and be inserted into the square recess B403 to limit the valve seat 5 (both square protrusions B408 are inserted into the square recess B403 to limit the valve seat 5, at this time, the staff does not need to hold the valve seat 5), until the telescopic rod 405 is in the shortest state, at this time, the screw rod 407 passes through the through hole A406 on the movable plate 409, then the nut is installed on the screw rod 407 by rotating clockwise, the nut moves along the screw rod 407 and slowly abuts against the surface of the movable plate 409, so that the installation of the valve seat 5 is completed, conversely, the nut on the screw rod 407 is removed, the square protrusion B408 is pulled out of the square recess B403 and the square through slot 404, and then the upper open slot seat 402 is pulled off from the connecting block 401, so that the disassembly of the valve seat 5 is completed (without using the tool described in the background technology), and the disassembly and assembly are very convenient.

[0028] Moreover, the connecting block 401 is detachably connected with the bottom of the valve body 1, so that when the connecting block 401 is damaged and affects the installation of the valve seat 5, it can be replaced from the valve stem 3, and the specific structure of the detachable connection is as follows: a plurality of screw holes 12 are arranged in a circumferential array on the outer side wall of the valve stem 3 close to the bottom end, and the top end of the connecting block 401 is fixedly connected with the cylindrical slot seat 13 that can be inserted into the bottom of the valve stem 3, and a plurality of through holes B14 are arranged in a circumferential array on the outer side wall of the cylindrical slot seat 13.

[0029] The cylindrical slot seat 13 is inserted into the bottom of the valve stem 3, and the through hole B14 and the screw hole 12 are aligned by rotating the cylindrical slot seat 13, then the screw is inserted into the screw hole 12 by passing through the through hole B14 and rotating clockwise, so that the cylindrical slot seat 13 and the valve stem 3 are fixed, and the connecting block 401 is installed on the valve stem 3, conversely, the screw is removed, and the cylindrical slot seat 13 is pulled out of the bottom of the valve stem 3, so that the disassembly of the connecting block 401 is completed.

[0030] Further, the flange A6 is installed at the connecting position of the valve body 1, the flange B7 is installed at the connecting position of the valve body 1, the flange A6 and the flange B7 are fixed through bolts, square recesses A8 are formed at the top of the flange A6, square blocks A9 matched with the square recesses A8 are formed at the bottom of the flange B7, the flange B7 and the flange A6 are guided through the square blocks A9 inserted into the square recesses A8, so that the installation position of the flange B7 relative to the flange A6 is quickly found, and the annular recess 10 is formed at the top of the flange A6, the sealing gasket is bonded on the inner side wall of the annular recess 10, the annular block 11 is fixedly connected to the bottom end of the flange B7, the contact stress of the sealing gasket is concentrated on the interface between the annular recess 10 and the annular block 11 through the concave-convex cooperation, compared with the full-plane contact of the flat flange, higher sealing specific pressure can be realized with smaller contact area, so that the sealing effect of the flange connection is significantly improved.

[0031] The above is only the preferred embodiment of the present application, and does not limit the present application in any form; any person skilled in the art can implement the present application according to the above description and the drawings; however, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the present application are equivalent embodiments of the present application; meanwhile, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the present application are equivalent embodiments of the present application.

Claims

1. A gate valve for the petroleum industry with easy seat replacement, comprising a valve body (1) and a valve stem support (2), the two being connected by a flange, characterized in that: A valve stem (3) is provided on the valve stem support (2). The bottom of the valve stem (3) is connected to the valve seat (5) through a quick-release assembly (4). The quick-release assembly (4) fixes the valve seat (5) by first limiting and then fixing.

2. The petroleum industry gate valve with easy seat replacement according to claim 1, characterized in that: A flange A (6) is installed at the connection part of the valve body (1), and a flange B (7) is installed at the connection part of the valve body (1). The flange A (6) and the flange B (7) are fixed together by bolts. A square groove A (8) is provided on both sides of the top of the flange A (6), and a square block A (9) is provided on both sides of the bottom of the flange B (7) to match the square groove A (8).

3. A gate valve for the petroleum industry with an easily replaceable valve seat as described in claim 2, characterized in that: The flange A (6) is also provided with an annular groove (10) at the top, and a sealing gasket is adhered to the inner wall of the annular groove (10). An annular block (11) is fixedly connected to the bottom end of the flange B (7).

4. A gate valve for the petroleum industry with easily replaceable valve seats according to claim 1, characterized in that: The quick-release assembly (4) includes a connecting block (401) on which the bottom of the valve stem (3) is installed. The top of the valve seat (5) is fixedly connected to an upper open slot seat (402) that is adapted to the connecting block (401). Both sides of the connecting block (401) are provided with square grooves B (403). Both sides of the upper open slot seat (402) are provided with square through grooves (404) that are flush with the square grooves B (403).

5. A gate valve for the petroleum industry with easily replaceable valve seats according to claim 4, characterized in that: The surface of the upper open slot seat (402) is fixedly connected to telescopic rods (405) on both sides of the square through slot (404), and the head of the telescopic rod (405) is fixedly connected to a movable plate (409). The movable plate (409) has through holes A (406) on both sides of its surface. The surface of the upper open slot seat (402) is flush with the through hole A (406) with a screw (407), and a nut is threaded on the outer side wall of the screw (407). A square protrusion B (408) is fixedly connected to the surface of the movable plate (409) facing the upper open slot seat (402).

6. A gate valve for the petroleum industry with easily replaceable valve seats according to claim 4, characterized in that: The connecting block (401) is detachably connected to the bottom of the valve body (1).

7. A gate valve for the petroleum industry with easily replaceable valve seats according to claim 6, characterized in that: The outer side wall of the valve stem (3) near the bottom has a plurality of screw holes (12) arranged in a circular array. The top end of the connecting block (401) is fixedly connected to a cylindrical slot seat (13) that can be inserted into the bottom of the valve stem (3). The outer side wall of the cylindrical slot seat (13) has a plurality of through holes B (14) arranged in a circular array.

Images