CN212807710U - Emptying-free sampling valve capable of being replaced under pressure - Google Patents

Abstract

The utility model provides a take pressure to change flange ball valve of exempting from unloading sampling valve is the base valve, the left flange of flange ball valve passes through bolt and left flange, tube socket connection, the nipple joint is equipped with perpendicularly on the tube socket, the auxiliary valve, lower nipple joint, bolt and right flange are passed on the right of flange ball valve, sealing box is connected, the center tube is from sealing box, the flange ball valve, the tube socket center is passed, the center tube passes with the valve rod from the center tube, valve rod and center tube threaded connection, be equipped with packing I between sealing box and the center tube, the cover has gland I on the center tube, gland I and sealing box right-hand member threaded connection, with gland I, packing I compresses tightly, be equipped with packing II between center tube and the valve rod, the cover has gland II on the center tube, gland II compress tightly, the valve rod right-hand. The invention is used for sampling without emptying in oil wells of oil fields and crude oil gathering and transportation pipelines, and replacing valve accessories without stopping production, thereby avoiding crude oil loss and preventing environmental pollution.

Description

Emptying-free sampling valve capable of being replaced under pressure

Technical Field

The invention relates to an oil field oil well Christmas tree equipment fitting, in particular to a pressure replacement emptying-free sampling valve.

Background

In the development process of oil fields in the petroleum industry, a sampling valve of an oil well Christmas tree is a necessary accessory of a fluid medium conveying pipeline, which refers to a sampling valve body in narrow sense, and generally comprises a left short section welded on the pipeline, a sampling valve arranged on the short section and a right short section (outlet elbow). The left short section is inserted into the pipeline, and the inlet of the left short section is positioned on the axis of the pipeline so as to ensure the sampling precision. Exempt from the unloading gate as the sample gate, avoided the unloading link of sample, its sealed point is located the left end, receives the corrosive influence of transport medium, and left nipple joint can appear corroding, exempt from the unloading gate then to show that the valve is closed not tight, changes the valve and must shut down the well, not only influences crude oil production, and the unloading causes crude oil loss moreover, the polluted environment.

A sampling valve (ZL 200620009725.8) for oil pipeline is composed of pipeline, welded pipe, valve body, pressing cap and valve rod. During the sample, rotatory valve rod, valve rod left end conical surface leave valve body left end conical surface, and crude oil in the pipeline flows out from the UNICOM groove of valve body downside, because the volume in the UNICOM groove of valve body downside is very little, so can directly get crude oil sample, need not empty freely, can not cause crude oil waste and environmental pollution, sample work convenient, swift. The utility model discloses a weak point is that can not take the area to press the change operation of accomplishing the sample valve, and environmental pollution is difficult to avoid.

A valve [ ZL201621253388.7 ] for online sampling of fluid conduit media, comprising: the sampling device comprises a valve body, a sampling bottle and a control valve, wherein the lower part of the valve body is provided with a sampling port, and the sampling bottle is connected with the sampling port through threads; a valve rod is arranged in the cavity of the valve body and is connected with the valve core through threads; the driving device is connected with the valve rod through threads and used for driving the valve rod to rotate so that the valve core can move along the valve rod. The invention realizes uninterrupted sampling in the liquid conveying process. The utility model discloses a weak point is that can not take the area to press and accomplish the change operation of sampling valve, and it is long to trade valve stop transmission time.

A valve [ ZL201520387058.6 ] for pipeline sampling, comprising: the valve body is provided with a sampling inlet at the upper end, the sampling inlet is set to be a smooth arc surface, the side surface of the valve body is connected with a handle through the valve rod, the valve rod is vertical to the central lines of the sampling inlet and the sampling outlet, a packing gland with a lock hole is pressed above the packing, the packing gland with the lock hole is provided with a first lock hole and a second lock hole, the circle center lines of the first lock hole and the second lock hole are vertical to each other, a limiting block with the lock hole is arranged between the packing gland with the lock hole and the handle, the limiting block with the lock hole is provided with a third lock hole, the third lock hole is coincided, locked and fixed with the first lock hole when rotating 90 degrees anticlockwise, and the third lock hole is coincided, locked and fixed with the; the sampling inlet and outlet of the valve and the handle are arranged at the lower part of the pipeline. The invention has reasonable design and simple operation, and avoids the phenomena of medium accumulation, detention and misoperation. The utility model discloses a weak point is that can not take the area to press the change operation of accomplishing the sample valve, and it is long to trade valve stop transmission time, and environmental pollution is difficult to avoid.

An oil pipeline sampling valve [ ZL201320544531.8 ] comprising: the valve comprises a plug, a pipeline, a welded pipe, a valve body, a pressing cap and a valve rod, wherein the welded pipe is arranged in the pipeline, the valve body is in threaded connection with the welded pipe, and the valve rod is arranged in the valve body. The external screw thread of valve rod and the internal thread connection of valve body press the external screw thread connection of cap and valve body, and the valve body downside has the UNICOM groove, and the right-hand member of jam is hung at the left end of valve rod. The contact surface of the plug and the valve rod is a spherical surface, the conical surface at the left end of the plug is in contact with the inner conical surface at the left end of the valve body, the sampling valve and an oil sample do not need to be emptied, crude oil waste and environmental pollution cannot be caused, sampling work is convenient and rapid, the plug and the valve rod can be aligned, the sealing surface between the plug and the valve body can be ensured to be a continuous surface, and sealing of the oil sampling valve is ensured. The utility model discloses a weak point is that case corruption easily causes the pollution, can not take the area to press the change operation of accomplishing sampling valve, and it is long to trade the valve and stop defeated time, and environmental pollution is difficult to avoid.

A bidirectional sampling valve (ZL 201820832265.9) belongs to a device for oil field production and comprises a cylindrical valve body, wherein a convex ring protruding inwards is arranged in the middle of the valve body, a first inner cavity of the valve body above the convex ring is communicated with an oil inlet on the side, a boss-shaped bidirectional valve rod is arranged in a second inner cavity of the valve body below the convex ring, a hand wheel is fixed at the upper end of a lead screw on the bidirectional valve rod after penetrating through the valve body, the second inner cavity of the valve body is communicated with an oil outlet on the side, a sampling port is arranged at the lower end of the valve body, a first sealing ring is arranged on the upper wall of the second inner cavity of the valve body, and a second sealing ring is arranged on the lower wall of the second inner cavity of the valve body. This kind of sampling valve opens the sample connection through lifting the two-way valve body when the sample, and fresh fluid can flow out, has accomplished the process of not emptying the sample, simultaneously because fluid is in mobile state, the oil appearance data accuracy of taking out is high. The operation is simple, the working strength of an oil extraction worker is reduced, and the environment is protected. And the structure is simple and the cost is low. The utility model discloses a weak point is not considered the valve body and just can realize under subjective control as the bias current problem of bypass line, the sampling degree of accuracy, and the valve body corrodes the back and changes and need to shut down the well.

Disclosure of Invention

The invention aims to solve the technical problems and provides a pressure replacement emptying-free sampling valve.

The purpose of the invention is realized by the following technical scheme:

the invention comprises the following steps: the device comprises a pipeline, a central pipe, a valve rod, a pipe seat, an upper short section, a sealing ring, an auxiliary valve, a lower short section, a left flange, a left gasket, a bolt, a flange ball valve, a right gasket, a right flange, a sealing box, a packing I, a gland I, a packing II, a gland II, a hand wheel, a nut and an auxiliary tool for dismounting; the method is characterized in that: the flange ball valve is a base valve, the left flange of the flange ball valve passes through a bolt and a left flange, the tube seat is connected, the tube seat is vertically provided with a short section, an auxiliary valve and a lower short section, the right of the flange ball valve passes through a bolt and a right flange, the sealing box is connected, the central tube passes through the sealing box, the flange ball valve and the tube seat, the central tube passes through the central tube and the valve rod, the valve rod is in threaded connection with the central tube, a packing I is arranged between the sealing box and the central tube, a gland I is sleeved on the central tube, a gland I is arranged on the central tube, the gland I is in threaded connection with the right end of the sealing box, the gland I is tightly pressed, the packing I is tightly pressed, a packing II is arranged between the central tube and the valve rod, a gland.

Preferably, the central tube is a stepped tube, the left end of the central tube is a 45-degree pen point section, external threads to the limiting steps are sequentially arranged on the outer side of the central tube from left to right, liquid drainage holes are formed outside the limiting steps, the diameter of the right end is larger than the inner diameter of the left part and is provided with the external threads, T-shaped marks are arranged on the inner side of the right end, a short and thin circular hole section, a conical hole section, a main circular hole section, a thick threaded hole section and a through hole section are sequentially arranged in the inner cavity of the central tube from left to right and correspond to the outer diameter of the valve rod, and the central tube.

Preferably, the valve rod is a stepped shaft, a short and thin cylindrical section, a frustum section, a main cylindrical section, a sealing ring groove, a thick thread section and a drift diameter section are sequentially processed from left to right and correspond to an inner hole of the central pipe, a sealing ring is arranged in the sealing ring groove, the left end of the valve rod is square, an external thread is arranged at the end head of the valve rod, and the valve rod is made of stainless steel materials.

Preferably, the pipe seat is a circular pipe, the right end of the pipe seat is connected with the left flange, a first-stage stepped hole is formed in the pipe seat, the inner diameter of the left end of the pipe seat is smaller than that of the right end of the pipe seat, an internal thread matched with the central pipe is arranged at the left end of the pipe seat, a through hole is formed in the position, close to the step, below the pipe seat, of the pipe seat, an upper short section is welded on the through hole, and the upper short section.

Preferably, a left gasket is arranged between the flange ball valve and the left flange, and a right gasket is arranged between the flange ball valve and the right flange.

Preferably, the auxiliary tool for disassembly and assembly is of a rectangular frame structure, and the left pulling plate and the right pulling plate are tightened by the upper bolt and the lower bolt respectively from top to bottom.

Preferably, the left pulling plate is of a symmetrical acute angle plate-shaped round head structure, through holes are formed in two ends of the left pulling plate, and a U-shaped groove I is formed in the middle of the left pulling plate.

Preferably, the right pulling plate is of a symmetrical acute angle plate-shaped round head structure, through holes are formed in two ends of the right pulling plate, a U-shaped groove II is formed in the middle of the right pulling plate, and the width of the right pulling plate is smaller than that of the left pulling plate.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "left", "center", "two ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second", "third", "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", "fourth" may explicitly or implicitly include at least one such feature.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

The invention has the beneficial effects that: the valve is suitable for oil wells of oil fields and crude oil gathering and transportation pipelines, and is free of emptying for sampling, when the central pipe and the valve rod are not tightly corroded, the auxiliary valve is closed, the central pipe and the valve rod are detached, the base valve is closed, the valve is replaced without stopping production, crude oil production is not influenced, and therefore crude oil loss caused by emptying is avoided, and the environment is prevented from being polluted.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below, and the same reference numerals are used to designate the same components throughout the drawings, which are for the purpose of illustrating preferred embodiments only and are not to be construed as limiting the present invention, it being apparent that the drawings in the following description are merely some embodiments of the present invention, and various other advantages and benefits will become apparent to those skilled in the art from the detailed description of the preferred embodiments, and other drawings may be obtained from the drawings without inventive effort.

FIG. 1 is a schematic view of a front view of the present invention

In the figure, a pipeline 1, a central pipe 2, a valve rod 3, a pipe seat 4, an upper short section 5, a sealing ring 6, an auxiliary valve 7, a lower short section 8, a left flange 9, a left gasket 10, a bolt 11, a flange ball valve 12, a right gasket 13, a right flange 14, a sealing box 15, a packing I16, a gland I17, a pressure cap I18, a packing II 19, a gland II 20, a pressure cap II 21, a hand wheel 22, a nut 23 and an A-round hole are arranged;

FIG. 2-schematic top view of the central tube 2, B-weep hole; c- "T" shaped mark;

FIG. 3 is a front view of the valve stem 3 showing a schematic view of the D-seal ring groove;

FIG. 4 is a schematic front view of a half-sectional structure of the stem 4, showing an E-through hole;

FIG. 5 is a schematic diagram of a structure for field application of the present invention, which shows an auxiliary tool 24 for disassembly and assembly, an upper bolt 24-1, a left pulling plate 24-2, a lower bolt 24-3, and a right pulling plate 24-4.

FIG. 6 is a schematic left side view of the left pulling plate 24-2, showing a "U" shaped channel I;

fig. 7 is a left-side view structural schematic diagram of the right pulling plate 24-4, wherein a G- 'U' -shaped groove II is formed.

Detailed Description

To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, embodiments, structures, features and effects according to the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.

The invention is composed of a pipeline 1, a central pipe 2, a valve rod 3, a pipe seat 4, an upper short section 5, a sealing ring 6, an auxiliary valve 7, a lower short section 8, a left flange 9, a left gasket 10, a bolt 11, a flange ball valve 12, a right gasket 13, a right flange 14, a sealing box 15, a packing I16, a gland I17, a pressure cap I18, a packing II 19, a gland II 20, a pressure cap II 21, a hand wheel 22, a nut 23 and an auxiliary tool 24 for dismounting; the method is characterized in that: the flange ball valve 12 is a base valve, a left flange of the flange ball valve 12 is connected with a left flange 9 and a pipe seat 4 through a bolt 11, an upper short section 5, an auxiliary valve 7 and a lower short section 8 are vertically arranged on the pipe seat 4, the auxiliary valve 7 is in a normally open state, the right side of the flange ball valve 12 is connected with a right flange 14 and a sealing box 15 through a bolt 11, a central pipe 2 penetrates through the centers of the sealing box 15, the flange ball valve 12 and the pipe seat 4, the central pipe 2 and a valve rod 3 penetrate through a central pipe 2, the valve rod 3 is in threaded connection with the central pipe 2, a packing I16 is arranged between the sealing box 15 and the central pipe 2, a gland I17 and a press cap I18 are sleeved on the central pipe 2, the press cap I18 is in threaded connection with the right end of the sealing box 15, the press cap I17 and the packing I16 are tightly pressed, a packing II 19 is arranged between the central pipe 2 and the valve rod 3, the gland II 20 and the packing II 19 are tightly pressed, and the right end of the valve rod 3 is provided with a hand wheel 22 which is fixed through a nut 23.

The central tube 2 is a stepped tube, the left end of the central tube is a 45-degree pen point section, the left part of the central tube is positioned in the pipeline 1, and the pen point section is in contact with flowing media. The outer thread to spacing step is equipped with from a left side to the right side in proper order in the 2 outsides of center tube, and spacing step is equipped with weeping hole B outward, and right-hand member head diameter is greater than left part internal diameter and is equipped with the external thread, and the inside of right-hand member head is equipped with "T" shape mark C, and 2 inner chambers of center tube are short thin circular hole section, taper hole section, main part circular hole section, thick screw hole section, through-hole section from a left side to the right side in proper order, and is corresponding with the external diameter. The external thread on the left side of the central tube 2 is connected with the internal thread of the tube seat 4 to form a fixed section, and the limiting step ensures that the cross section of the pen point is positioned on the central line of the pipeline 1 and ensures that the central tube 2 is stable in state under the impact of unstable liquid flow. The distance between the transverse line of the T-shaped mark C and the right end face of the right flange 14 reaches a fixed value, when the longitudinal line is positioned right above, the central tube 2 is installed at a proper position, and the liquid discharge hole B is positioned at the lowest part.

The sealing ring valve rod 3 is a stepped shaft, a short and thin cylindrical section, a frustum section, a main cylindrical section, a sealing ring groove D, a thick thread section and a drift diameter section are sequentially processed from left to right and correspond to an inner hole of the central pipe 2, a sealing ring 6 is arranged in the sealing ring groove D, the left end of the valve rod 3 is set to be a square, and an external thread is arranged at the end.

Tube socket 4 is the pipe, inserts pipeline 1 and is in the same place with round hole A concentric welding, and tube socket 4 right side and left flange 9 concentric welding are in the same place, and inside is equipped with one-level shoulder hole, and the left end internal diameter is less than the right-hand member internal diameter, and the left end is equipped with 2 complex internal threads of center tube, and tube socket 4 below is close to the step processing and has through-hole E to nipple joint 5 has been welded at through-hole E, and last nipple joint 5 loops through screw thread and auxiliary valve 7, lower nipple joint 8 threaded connection.

A left gasket 10 is arranged between the flange ball valve 12 and the left flange 9, and a right gasket 13 is arranged between the flange ball valve 12 and the right flange 14.

The disassembly and assembly auxiliary tool 24 is of a rectangular frame structure, and the left pulling plate 24-2 and the right pulling plate 24-4 are tightened by an upper bolt 24-1 and a lower bolt 24-3 respectively from top to bottom.

The left pulling plate 24-2 is of a symmetrical acute angle plate-shaped round head structure, through holes are formed in two ends of the left pulling plate, and a U-shaped groove IF is formed in the middle of the left pulling plate.

The right pulling plate 24-4 is of a symmetrical acute angle plate-shaped round head structure, through holes are formed in two ends of the right pulling plate, a U-shaped groove II G is formed in the middle of the right pulling plate, and the width of the right pulling plate 24-4 is smaller than that of the left pulling plate 24-2.

Sampling operation: the hand wheel 22 is rotated anticlockwise, the valve rod 3 moves rightwards to form a gap with the central pipe 2, sampling media flow rightwards through the gap to enter annular spaces of the valve rod 3 and the central pipe 2, are blocked by the sealing ring 6 to enter annular spaces of the central pipe 2 and the pipe seat 4 through the liquid discharge hole B, and flow out through the through hole E, the upper short section 5, the auxiliary valve 7 and the lower short section 8. The hand wheel 22 is rotated clockwise after sampling, the valve rod 3 and the left-most gap of the central tube 2 are closed, and sampling media in the cavity flow out under the action of gravity, so that emptying-free sampling is completed.

Disassembling the valve stem 3 from the central tube 2: when the valve rod 3 and the central pipe 2 are corroded, and the gap between the sampling valve rod 3 and the frustum on the left side of the central pipe 2 is not closed, the valve rod 3 and the central pipe 2 need to be replaced. The auxiliary valve 7 should be closed first to avoid environmental pollution. The auxiliary disassembly and assembly tool 24 is installed and a new valve stem 3 and the central tube 2 are ready to be replaced. The upper bolt 24-1 and the lower bolt 24-3 are gradually loosened and cannot be removed, the central tube 2 is rotated to be separated from the internal thread of the tube seat 4, the valve rod 3 and the central tube 2 move rightwards under the action of pressure difference in the tube, and the limiting step is contacted with the packing I16 to stop moving. Closing the flange ball valve 12, unloading gradually and pressing the I18 pressure release of cap, taking off dismouting appurtenance 24, taking out gland I17, taking out packing I16, taking off valve rod 3 and center tube 2, clean the inspection.

Mounting the valve stem 3 in operation with the central tube 2: lubricating grease is coated on the valve rod 3 and the central tube 2, the valve rod 3 and the central tube 2 are assembled and inserted into the sealing box 15, the packing I16, the gland I17 and the pressure cap I18 of the central tube 2 are installed, and the T-shaped mark C faces downwards to avoid installation blockage. And (4) installing a dismounting auxiliary tool 24, tightening an upper bolt 24-1 and a lower bolt 24-3, and opening the flange ball valve 12. Inserting the valve rod 3 and the central tube 2 assembly body into the pipeline 1, measuring the distance between the transverse line of the T-shaped mark C and the right end face of the right flange 14, and determining whether the threads can be connected; the rotating central tube 2 is in threaded fit with the tube seat 4, the T-shaped mark C is aligned and measured to confirm the position, and the pressing cap I18 is screwed down. The disassembly and assembly auxiliary tool 24 is disassembled, the auxiliary valve 7 is opened to release pressure, the installation quality is checked,

the sampling operation can be carried out without leakage.

While preferred embodiments of the present invention have been described above, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted to embrace the preferred embodiments and all such variations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (8)

1. The utility model provides a take pressure to change and exempt from unloading sampling valve, includes: the device comprises a pipeline (1), a central pipe (2), a valve rod (3), a pipe seat (4), an upper short section (5), a sealing ring (6), an auxiliary valve (7), a lower short section (8), a left flange (9), a left gasket (10), a bolt (11), a flange ball valve (12), a right gasket (13), a right flange (14), a sealing box (15), a packing I (16), a gland I (17), a pressing cap I (18), a packing II (19), a gland II (20), a pressing cap II (21), a hand wheel (22), a nut (23) and an auxiliary tool for dismounting (24); the method is characterized in that: the flange ball valve (12) is a base valve, a left flange of the flange ball valve (12) is connected with a left flange (9) and a pipe seat (4) through bolts (11), an upper short section (5) is vertically arranged on the pipe seat (4), an auxiliary valve (7) and a lower short section (8) are vertically arranged on the pipe seat (4), the right side of the flange ball valve (12) is connected with a right flange (14) through bolts (11), a sealing box (15), a central pipe (2) penetrates through the center of the pipe seat (4), the central pipe (2) penetrates through the central pipe (2) and a valve rod (3), the valve rod (3) is in threaded connection with the central pipe (2), packing I (16) is arranged between the sealing box (15) and the central pipe (2), a pressing cover I (17) is arranged on the central pipe (2), a pressing I (18) is in threaded connection with the right end of the sealing box (15), and the pressing I (17), Packing I (16) compresses tightly, is equipped with packing II (19) between center tube (2) and valve rod (3), and the cover has gland II (20), presses cap II (21) on center tube (2), presses cap II (21) and center tube (2) right-hand member threaded connection, compresses tightly gland II (20), packing II (19), and the right-hand member of valve rod (3) is equipped with hand wheel (22), and is fixed through nut (23).

2. The pressure change emptying-free sampling valve according to claim 1, characterized in that: center tube (2) are a ladder pipe, and the left end is 45 nib sections, and center tube (2) outside is equipped with external screw thread to spacing step from the left hand right side in proper order, and spacing step is equipped with drain hole (B) outward, and right-hand member head diameter is greater than left part internal diameter and is equipped with the external screw thread, and the inside of right-hand member head is equipped with "T" shape mark (C), and center tube (2) inner chamber is short thin round hole section from a left side to the right side in proper order, the taper hole section, main part round hole section, thick screw hole section, the through-hole section, and is corresponding with the external diameter of valve rod (3.

3. The pressure change emptying-free sampling valve according to claim 1, characterized in that: the valve rod (3) is a stepped shaft, a short and thin cylindrical section, a frustum section, a main cylindrical section, a sealing ring groove (D), a thick thread section and a through diameter section are sequentially processed from left to right and correspond to an inner hole of the central pipe (2), a sealing ring (6) is arranged in the sealing ring groove (D), the left end of the valve rod (3) is arranged in a square, and an external thread is arranged at the end.

4. The pressure change emptying-free sampling valve according to claim 1, characterized in that: tube socket (4) are the pipe, and the right-hand member is connected with left flange (9), and inside is equipped with one-level shoulder hole, and the left end internal diameter is less than the right-hand member internal diameter, and the left end be equipped with center tube (2) complex internal thread, and tube socket (4) below is close to step processing and has through-hole (E) to nipple joint (5) have been welded in through-hole (E), go up nipple joint (5) and loop through screw thread and auxiliary valve (7), nipple joint (8) threaded connection down.

5. The pressure change emptying-free sampling valve according to claim 1, characterized in that: a left gasket (10) is arranged between the flange ball valve (12) and the left flange (9), and a right gasket (13) is arranged between the flange ball valve (12) and the right flange (14).

6. The pressure change emptying-free sampling valve according to claim 1, characterized in that: the disassembly and assembly auxiliary tool (24) is of a rectangular frame structure, and the left pulling plate (24-2) and the right pulling plate (24-4) are tightened by an upper bolt (24-1) and a lower bolt (24-3) from top to bottom respectively.

7. The pressure change emptying-free sampling valve according to claim 6, characterized in that: the left pulling plate (24-2) is of a symmetrical acute angle plate-shaped round head structure, through holes are formed in two ends of the left pulling plate, and a U-shaped groove I (F) is formed in the middle of the left pulling plate.

8. The pressure change emptying-free sampling valve according to claim 6, characterized in that: the right pulling plate (24-4) is of a symmetrical acute angle plate-shaped round head structure, through holes are formed in two ends of the right pulling plate, a U-shaped groove II (G) is formed in the middle of the right pulling plate, and the width of the right pulling plate (24-4) is smaller than that of the left pulling plate (24-2).

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