CN214369361U

CN214369361U - Leakage protection valve and gas field pipeline pressure measuring device

Info

Publication number: CN214369361U
Application number: CN202023243033.9U
Authority: CN
Inventors: 王红宾; 熊红武; 何国辉; 赵延平; 林涛; 卢芝香
Original assignee: China Petroleum and Chemical Corp; Sinopec Zhongyuan Oilfield Co Puguang Branch
Current assignee: China Petroleum and Chemical Corp; Sinopec Zhongyuan Oilfield Co Puguang Branch
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-10-08
Anticipated expiration: 2030-12-29

Abstract

The utility model relates to a leak protection valve and gas field pipeline pressure measurement device, leak protection valve includes: the valve body is provided with an air inlet interface and an air outlet interface; the gas channel is arranged on the valve body and is communicated with the gas inlet interface and the gas outlet interface; a valve ball is movably assembled in the gas channel, an upper valve seat and a lower support are arranged on the valve body, the upper valve seat is in sealing fit with the valve ball to block the gas channel, and the lower support supports the valve ball falling due to gravity; in the gas flowing direction, the gas inlet interface, the lower support, the upper valve seat and the gas outlet interface are sequentially arranged. When the pressure measuring device is used, when the leakage occurs at the downstream side of the leakage protection valve, the valve ball automatically moves upwards to close the measuring pipeline under the action of pressure, so that large-area leakage is prevented, and the safety performance of the pressure measuring device is improved. And, dispose the bypass gas circuit corresponding to this kind of leakage protection valve, utilize the bypass gas circuit to make the upper and lower both sides pressure balance of leakage protection valve, can guarantee that whole pressure measurement device normally puts into operation, after putting into operation, close the bypass control valve can.

Description

Leakage protection valve and gas field pipeline pressure measuring device

Technical Field

The utility model relates to a leak protection valve and gas field pipeline pressure measurement device.

Background

Adopt gathering and transportation pipeline transport natural gas in the oil gas field, for guaranteeing safety, install pressure measurement device on gathering and transportation pipeline, current pressure measurement device includes the pressure measurement pipeline, along the gas flow direction of pressure measurement pipeline, it has the measurement control valve to assemble in proper order through cutting ferrule screw thread connected mode on the pressure measurement pipeline, filter and pressure change sensor, measurement pipeline fixed connection is on gathering and transportation pipeline, measurement control valve control measurement pipeline break-make, the filter is used for filtering gas, pressure change sensor is used for measuring gas pressure as the pressure measurement part, and will detect structural transmission to control center. During measurement, the measurement control valve is opened, the pressure measuring pipeline is conducted, and gas is filtered by the filter and then flows to the pressure change sensor.

Because the conveying medium in the gathering and transportation pipeline of the high-sulfur-content gas field is highly toxic and harmful high-sulfur-content natural gas, when the natural gas runs in the pipeline, sulfur deposition is serious, the problems of untight closing of a measurement control valve, blockage of a pressure measurement pipeline and the like are easily caused, the natural gas needs to be disassembled and cleaned regularly to eliminate the blockage problem of the pressure measurement pipeline, during cleaning, the measurement control valve is closed firstly, a clamping sleeve pressing cap on the pressure measurement pipeline is unscrewed, a clamping sleeve pressing cap thread is disassembled under pressure according to operation experience, and corresponding parts are disassembled. In the process of disassembly, if the measurement control valve is not tightly closed, the leakage of the natural gas with high hydrogen sulfide content is easy to occur, a highly toxic environment can be quickly formed, and the method is very dangerous. Moreover, when the clamping sleeve pressing cap is detached in a pressing mode, if the screw thread is damaged, the corresponding interface can be suddenly broken, and if the measurement control valve cannot be closed in time, toxic and harmful natural gas containing high content of hydrogen sulfide quickly leaks, so that the risks of personal injury and environmental pollution are caused. In addition, because the filter is frequently disassembled and cleaned, the risk of accidental leakage of the pipeline structures at the front and the rear of the filter is higher, if the leakage happens in unattended operation, the measurement control valve cannot be timely and effectively closed, a highly toxic environment can be quickly formed in a local environment, the environment is polluted, and great potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a leakage protection valve, which can quickly close a corresponding pipeline when leakage occurs at the downstream of the pipeline; and simultaneously, the utility model also provides an use gas field pipeline pressure measurement device of above-mentioned leakage protection valve to can not in time close the technical problem of measuring pipe way effectively when solving among the prior art measurement control valve downstream side and taking place to leak.

In order to achieve the above object, the utility model provides a leakage protection valve's technical scheme is: a leak protection valve comprising:

the valve body is provided with an air inlet interface and an air outlet interface;

the gas channel is arranged on the valve body and is communicated with the gas inlet interface and the gas outlet interface;

a valve ball is movably assembled in the gas channel, an upper valve seat and a lower support are arranged on the valve body corresponding to the valve ball, the upper valve seat is used for being in sealing fit with the valve ball to block the gas channel, and the lower support is used for supporting the valve ball falling due to gravity;

in the gas flowing direction, the gas inlet interface, the lower support, the upper valve seat and the gas outlet interface are sequentially arranged.

The beneficial effects are that: the utility model provides an among the leakage protection valve, correspond the valve ball and dispose disk seat and undersetting, utilize the undersetting to support the valve ball, utilize the sealed cooperation of disk seat and valve ball, realize the shutoff gas circuit. When leakage occurs at one side of the air outlet interface, pressure difference occurs between the air inlet interface and the air outlet interface, the valve ball can be driven to move upwards to automatically close the whole gas channel, automatic leakage protection is realized, and safety performance is improved.

As a further improvement, the inner peripheral surface of the lower support is of a conical structure with a large upper part and a small lower part, the inner peripheral surface of the lower support is provided with guide grooves which extend along the vertical direction and have two open ends, and/or the lower support is provided with guide holes which extend along the vertical direction and have two open ends, so that the gas channel is prevented from being blocked when the valve ball is seated on the lower support.

The beneficial effects are that: the inner peripheral surface of the lower support is of a conical structure, so that the lower support can conveniently fall and be positioned, and the flow guide grooves and/or the flow guide holes are/is configured, so that normal through flow can be ensured.

As a further improvement, the inner circumferential surface of the upper valve seat is of a conical structure with a small upper part and a big lower part, and the lower end of the conical inner circumferential surface of the upper valve seat is attached to the upper end of the conical inner circumferential surface of the lower support.

The beneficial effects are that: the inner peripheral surface of the upper valve seat is conical, so that the upper valve seat is in sealing fit with the valve ball conveniently.

As a further improvement, the valve body comprises an upper valve body and a lower valve body, the two valve bodies are detachably and fixedly assembled together, the top end of the upper valve body is provided with the air outlet connector, the bottom end of the upper valve body is provided with the upper valve seat, the top end of the lower valve body is provided with the lower support, and the bottom end of the lower valve body is provided with the air inlet connector.

The beneficial effects are that: the valve body is designed into an upper valve body and a lower valve body, so that the valve body is convenient to process and manufacture respectively and is also convenient to assemble integrally.

As a further improvement, the upper valve body and the lower valve body are sleeved with internal thread sleeves, one of the upper valve body and the lower valve body is in threaded fit with the internal thread sleeve, and the other one of the upper valve body and the lower valve body is in press fit with the internal thread sleeve, so that the upper valve body and the lower valve body can be detachably and fixedly assembled together through the internal thread sleeves.

The beneficial effects are that: the two valve bodies are assembled by utilizing the internal thread sleeve, and the assembly is convenient.

The utility model provides a gas field pipeline pressure measurement device's technical scheme is: a gas field pipeline pressure measurement device, comprising:

the measuring pipeline is fixedly connected to the corresponding gas field pipeline, and a measuring control valve, a filter and a pressure measuring component are sequentially arranged on the measuring pipeline along the gas flowing direction of the measuring pipeline;

the leakage protection valve is arranged on the measuring pipeline and is positioned between the measuring control valve and the filter;

the leakage prevention valve includes:

in the gas flowing direction, the gas inlet interface, the lower support, the upper valve seat and the gas outlet interface are sequentially arranged;

along the gas flow direction of the measuring pipeline, the gas inlet interface of the leakage protection valve is positioned at the upstream of the gas outlet interface;

the two ends of the bypass gas circuit are an upstream end and a downstream end, the downstream end is positioned between the leakage protection valve and the filter, and the upstream end is positioned at the upstream of the measurement control valve along the gas flowing direction of the measurement pipeline;

the bypass control valve is arranged on the bypass air passage and can be opened to conduct the bypass air passage when the pressure measuring device is put into operation, so that the pressure of the upper side and the lower side of the valve ball is balanced, and the measuring pipeline is normally conducted; the pressure measuring device can be closed to disconnect the bypass gas path after being put into operation, and the leakage protection valve can be normally closed to disconnect the measuring pipeline when leakage occurs at the downstream of the leakage protection valve on the measuring pipeline.

The beneficial effects are that: the utility model provides an among the gas field pipeline pressure measurement device, set up the leakage protection valve on surveying the pipeline, when the downstream side of leaking the protection valve appears leaking, under the pressure effect, the valve ball is automatic goes upward in order to close the measurement pipeline, prevents the large tracts of land leakage, improves pressure measurement device's security performance. And, dispose the bypass gas circuit corresponding to this kind of leakage protection valve, utilize the bypass gas circuit to make the upper and lower both sides pressure balance of leakage protection valve, can guarantee that whole pressure measurement device normally puts into operation, after putting into operation, close the bypass control valve can.

The inner peripheral surface of the lower support is of a conical structure with a large upper part and a small lower part, the inner peripheral surface of the lower support is provided with guide grooves which extend along the vertical direction and have two open ends, and/or the lower support is provided with guide holes which extend along the vertical direction and have two open ends, so that the valve ball is prevented from blocking a gas channel when being seated on the lower support.

As a further improvement, the measuring pipeline is connected with an upper evacuation gas line and/or a lower exhaust gas line, the upper exhaust gas line has an upper bleed air end, the upper bleed air end is located between the filter and the pressure measuring part, the lower exhaust gas line has a lower bleed air end, the lower bleed air end is located between the leakage protection valve and the measurement control valve, and the upper exhaust gas line and/or the lower exhaust gas line is used for guiding gas in the corresponding pipe section of the measuring pipeline to the collecting container when being conducted.

The beneficial effects are that: the upper evacuation gas circuit and/or the lower exhaust gas circuit are connected on the measuring pipeline, and the gas in the corresponding pipeline section can be correspondingly guided to the collecting container, so that the disassembly under pressure is avoided, and the safety is improved.

As a further improvement, when the bypass gas path is used as a purge gas path, the bypass gas path is conducted with the upper evacuation gas path and/or the lower exhaust gas path at the same time, so as to form a purge pressure difference between the upstream and downstream of the filter and/or the leakage protection valve.

The beneficial effects are that: the bypass air path is matched with the upper air exhaust path and/or the lower air exhaust path for use, so that the bypass air path can work as a cleaning air path to clean the blocking position in the measuring pipeline.

As a further improvement, when the measuring pipeline is connected with the upper evacuation gas circuit and the lower evacuation gas circuit, two rows of air circuits are respectively provided with an evacuation control valve, the two rows of air circuits share a total evacuation gas circuit, and the total evacuation gas circuit is used for being inserted into the collecting container so as to guide gas led out from the two evacuation gas circuits to the collecting container.

The beneficial effects are that: the two evacuation gas circuits are respectively provided with an evacuation control valve, so that the two evacuation gas circuits are convenient to control respectively, and the common total evacuation gas circuit is convenient to share the collecting container.

As a further improvement, the gas field pipeline pressure measuring device further comprises the collecting container, and the total emptying gas circuit is correspondingly and hermetically inserted into the collecting container.

The beneficial effects are that: with the pressure measuring device directly attached with the collecting container, the user does not need to additionally configure the collecting container on site.

Drawings

Fig. 1 is a schematic structural view of a gas field pipeline pressure measuring device provided by the present invention;

fig. 2 is a schematic view showing the structure of the leakage prevention valve of fig. 1.

Description of reference numerals:

1. a gas field pipeline; 2. measuring a pipeline; 3. a bypass gas path; 4. an upper air exhausting path; 5. a lower air path is emptied; 6. a measurement control valve; 7. a filter; 8. a pressure-change sensor; 9. a leakage prevention valve; 10. a bypass control valve; 11. an upper evacuation control valve; 12. a lower evacuation control valve; 13. a collection container; 14. an upper valve body; 15. a lower valve body; 16. an internal thread sleeve; 17. a valve ball; 18. a diversion trench; 19. an air outlet interface; 20. an upper valve seat; 21. a lower support; 22. an air inlet interface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrase "comprising an … …" do not exclude the inclusion of such elements in processes or methods.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

The present invention will be described in further detail with reference to examples.

The utility model provides a gas field pipeline pressure measurement device's embodiment 1:

the pressure measurement device in this embodiment is used on gas field pipeline 1, can be applied to the gas pipeline of oil gas field gathering and transportation pipe network, can prevent effectively that measuring pipe 2 from appearing leaking and the danger that brings, and, dispose corresponding evacuation gas circuit and bypass gas circuit 3, utilize bypass gas circuit 3 as cleaning the gas circuit, use with corresponding evacuation gas circuit cooperation, the gas in the usable gas field pipeline 1 cleans corresponding spare part like filter 7 etc. reduces and blocks up the influence to pressure measurement.

Specifically, the structure of the pressure measuring device is as shown in fig. 1 and fig. 2, the pressure measuring device comprises a measuring pipeline 2, the measuring pipeline 2 can be fixedly connected to a corresponding gas field pipeline 1 in a welding or flange connection mode, and a measuring control valve 6, a leakage protection valve 9, a filter 7 and a pressure measuring component are sequentially arranged on the measuring pipeline 2 along the gas flow direction of the measuring pipeline 2. Generally speaking, in the field of oil and gas fields, the measurement pipeline 2 extends in the up-down direction, and the measurement control valve 6, the leakage prevention valve 9, the filter 7, and the pressure measuring unit are arranged in this order from the bottom up.

The measurement control valve 6 can be a manual valve, and is used for controlling the connection and disconnection of the measurement pipeline 2, when the device is put into operation, the measurement control valve 6 can be slowly opened, and when the cleaning filter 7 and the pressure measuring component need to be detached or cleaning is carried out, the measurement control valve 6 can be closed.

The filter 7 can adopt the structure of the prior art, the filter 7 comprises an upper cover, a lower cover, a filter screen and a sealing gasket, the upper cover is provided with a central threaded hole and a concentric inner circular groove, symmetrical holes are formed around the upper cover, the lower cover is provided with a central threaded hole and a concentric inner circular groove, symmetrical holes are formed around the lower cover, the filter screen is of a net-shaped porous structure and is placed in the grooves of the upper cover and the lower cover, the sealing gasket is arranged outside the filter screen, and the upper cover hole and the lower cover hole are fastened through bolts.

In this embodiment, the pressure change sensor 8 is installed on the measurement pipeline as a pressure measurement unit for measuring the local air pressure of the gas field pipeline 1, and the detection data can be uploaded to the control center, so that remote monitoring is facilitated.

A leakage prevention valve 9 is arranged between the measurement control valve 6 and the filter 7 for enabling a rapid closing of the measurement line 2 in the event of a leakage on the measurement line 2 downstream of the leakage prevention valve 9. As shown in fig. 2, the leakage prevention valve 9 includes a valve body including an upper valve body 14 and a lower valve body 15, the upper valve body 14 and the lower valve body 15 both extend in the up-down direction, the lower end of the upper valve body 14 is attached to the upper end of the upper valve body 14, an internal thread bush 16 is fitted around the upper and lower valve bodies, the lower valve body 15 is screwed to the internal thread bush 16, and the upper valve body 14 is press-fitted to the internal thread bush 16, so that the upper valve body 14 and the lower valve body 15 are detachably fixed and assembled together by the internal thread bush 16. The two valve bodies are respectively provided with a gas channel, when the two valve bodies are fixedly assembled together, the bottom surface of the lower valve body 15 is attached to the top surface of the upper valve body 14, so that the gas channels on the two valve bodies are in butt joint communication to form the gas channel of the whole valve body.

Specifically, an air outlet port 19 is arranged at the top end of the upper valve body 14, an air inlet port 22 is arranged at the bottom end of the lower valve body 15, air channels of the two valve bodies communicate the air inlet port 22 with the air outlet port 19, an upper valve seat 20 is arranged at the bottom end of the upper valve body 14, the inner peripheral surface of the upper valve seat 20 is of a conical structure with a small upper part and a large lower part, a lower support 21 is arranged at the top end of the lower valve body 15, the inner peripheral surface of the lower support 21 is of a conical structure with a large upper part and a small lower part, when the two valve bodies are jointed and assembled together, the lower end of the conical inner peripheral surface of the upper valve seat 20 is jointed with the upper end of the conical inner peripheral surface of the lower support 21, so that the upper valve seat 20 and the lower support 21 are jointed to form an installation cavity, a valve ball 17 is movably assembled in the installation cavity, the upper valve seat 20 and the lower support 21 are arranged corresponding to the valve ball 17, the valve ball 17 can be in sealing fit with the upper valve seat 20 to block the air channels, the lower support 21 is used for supporting the valve ball 17 falling due to gravity, in the case of the leakage prevention valve 9, the inlet port 22, the lower seat 21, the upper seat 20, and the outlet port 19 are arranged in this order in the gas flow direction. Thus, when a large pressure difference occurs between the two sides of the valve ball 17 due to leakage at the side of the air outlet port 19, the valve ball 17 will rise rapidly against gravity under the action of the lower gas pressure, and the valve ball 17 is in sealing fit with the upper valve seat 20 to block the gas passage.

In order to prevent the valve ball 17 from blocking the gas passage when falling on the lower seat 21, in the present embodiment, the inner circumferential surface of the lower seat 21 is provided with the guide groove 18 extending in the up-down direction and having both ends opened, and at this time, when the valve ball 17 is seated on the lower seat 21, the gas passage is also conducted.

For a pressure measuring device, the inlet connection 22 of the leakage protection valve 9 is located upstream of the outlet connection 19 in the gas flow direction of the measuring line 2. Moreover, in order to ensure the normal operation of the leakage protection valve 9, a bypass gas path 3 is configured corresponding to the leakage protection valve 9, two ends of the bypass gas path 3 are connected to the measurement pipeline 2, and two ends of the bypass gas path 3 are an upstream end and a downstream end, wherein the downstream end is located between the leakage protection valve 9 and the filter 7, and the upstream end is located at the upstream of the measurement control valve 6 along the gas flow direction of the measurement pipeline 2. And, being equipped with the bypass control valve 10 on the bypass 3, when the pressure measurement device is put into operation, the bypass control valve 10 is opened, and bypass 3 switches on, makes the upper and lower lateral pressure of valve ball 17 balance, and the measuring pipe 2 normally switches on, guarantees normal pressure measurement. After the pressure measuring device is put into operation, the bypass control valve 10 is closed to disconnect the bypass gas path 3, so that when leakage occurs on the measuring pipeline 2 at the downstream of the leakage protection valve 9, the leakage protection valve 9 can be normally closed to disconnect the measuring pipeline 2, and the safety is ensured.

In addition, in this embodiment, an upper evacuation gas path 4 and a lower evacuation gas path 5 are further connected to the measurement pipeline 2, wherein an upper bleed end of the upper evacuation gas path 4 is connected to the measurement pipeline 2, the upper bleed end is located between the filter 7 and the pressure change sensor 8, a lower bleed end of the lower evacuation gas path 5 is connected to the measurement pipeline 2, the lower bleed end is located between the leakage protection valve 9 and the measurement control valve 6, evacuation control valves, i.e., an upper evacuation control valve 11 and a lower evacuation control valve 12, are respectively disposed on the two evacuation gas paths, and the two evacuation gas paths share a total evacuation gas path, the total evacuation gas path is used to be inserted into the collection container 13, when the two evacuation gas paths are conducted, the gas in the corresponding pipe section of the measurement pipeline 2 can be introduced to the collection container 13 by using the two evacuation gas paths and the total evacuation gas path, and the collection container 13 can contain an alkaline solution corresponding to the pipe for conveying the acidic gas, and introducing an acid gas into the alkaline solution to perform a neutralization reaction.

The main evacuation line is correspondingly inserted in a sealed manner into the collecting container 13, and the collecting container 13 can be directly detachably fastened to the main evacuation line. After a period of use, the alkaline solution inside is replaced. Of course, the collecting container 13 may also be designed to be portable according to the size of the pipeline, and when the air path needs to be emptied, the collecting container 13 and the total emptying air path are connected together.

When the cleaning filter 7, the pressure change sensor 8 and the leakage protection valve 9 need to be removed, two evacuation gas circuits can be utilized to correspondingly evacuate the corresponding pipe section of the measuring pipeline 2, the operation under pressure is not needed, and the safety factor can be effectively improved.

In addition, the bypass gas circuit 3 can be used as a gas circuit bypass to ensure the normal work of the leakage protection valve 9, and can also be used for cleaning the gas circuit, when the bypass gas circuit 3 is used as a cleaning gas circuit, the bypass gas circuit 3 can be simultaneously conducted with two rows of air circuits, that is, when the bypass gas circuit 3 and the upper row of air circuits 4 are simultaneously conducted, the bypass gas circuit 3 can be used as a cleaning gas circuit to work, at the moment, cleaning pressure difference can be formed at the upstream and downstream of the filter 7, the filter 7 is convenient to clean, meanwhile, the blockage in the corresponding pipe section of the measuring pipeline 2 can be correspondingly cleaned, the through-flow performance of the measuring pipeline 2 is improved, sulfur particles in the filter 7 and in the measuring pipeline 2 are blown into the corresponding emptying gas circuit, and the blockage influence is reduced. When the bypass air path 3 and the lower air exhaust path 5 are simultaneously conducted, the bypass air path 3 can work as a cleaning air path, and at the moment, a cleaning pressure difference can be formed at the upstream and downstream of the leakage protection valve 9, so that the leakage protection valve 9 is conveniently cleaned, and meanwhile, the blockage in the corresponding pipe section of the measuring pipeline 2 can be correspondingly cleaned, and the through-flow performance of the measuring pipeline 2 is improved.

When the pressure measuring device for the gathering and transportation pipe network of the high-sulfur-content gas field normally comes into operation, the two emptying control valves are closed, the bypass control valve is opened, the measuring control valve 6 is opened, the pressures of the upper side and the lower side of the valve ball 17 in the leakage protection valve 9 are balanced, the valve ball 17 falls on the lower support 21 under the action of gravity, the measuring pipeline 2 is conducted, and the high-sulfur-content natural gas passes through the measuring control valve 6, the leakage protection valve 9 and the filter 7 in the measuring pipeline 2 and then transmits the pressure to the pressure change sensor 8. After the pressure measuring device is normally put into operation, the bypass control valve is closed to ensure that the leakage protection valve 9 can play a role in leakage protection.

In the operation process, when acid gas leaks from the equipment pipeline on the downstream side of the leakage protection valve 9, the acid gas on the lower part of the leakage protection valve 9 can blow the valve ball 17 inside the leakage protection valve 9 to move upwards, so that the air flow channel can be quickly closed, the measuring pipeline 2 is automatically closed, and the acid gas is prevented from continuously leaking.

When the pressure change sensor 8 needs to be replaced, the measurement control valve 6 is closed, the upper exhaust control valve 11 and the lower exhaust control valve 12 are opened, and the pressure change sensor 8 is disassembled after the measurement pipeline 2 is completely decompressed. When the device is put into operation again, the upper exhaust control valve 11 and the lower exhaust control valve 12 are closed, the measurement control valve 6 is slowly opened, the high-sulfur-content natural gas enters the measurement pipeline 2, the bypass control valve is opened, the bypass control valve is closed after the front pressure and the rear pressure of the leakage protection valve 9 are balanced, and the high-sulfur-content gas field gathering pipeline network pressure measurement device is in a commissioning state.

When the upper part of the leakage protection valve 9 is blocked, the upper exhaust control valve 11 is opened, pressure difference occurs, the leakage protection valve 9 is automatically closed, the bypass control valve is slowly opened, the bypass gas path 3 works as a cleaning gas path, and acid gas sweeps the blockage into the recovery container. After the blockage is relieved, the upper exhaust control valve 11 is closed, the leakage protection valve 9 is automatically opened, then the bypass control valve is closed, and the pressure measuring device is put into use again.

When the pipeline between the leakage protection valve 9 and the lower part to the measurement control valve 6 is blocked, the measurement control valve 6 is closed, the lower exhaust control valve 12 is opened, the bypass control valve is opened slowly, the bypass gas path 3 works as a cleaning gas path, and acid gas sweeps the blockage into a recovery container. After the blockage is relieved, the lower emptying control valve 12 is closed, the measuring control valve 6 is opened, the bypass control valve is closed, and the pressure measuring device is put into use again.

When the metering control valve 6 and the preceding and following lines are blocked, the lower vent control valve 12 is opened and the acid gas purges the blockage into the recovery vessel. After the blockage is relieved, the lower emptying control valve 12 is closed, the measurement control valve 6 is opened, the natural gas with high hydrogen sulfide content enters the measurement pipeline 2, the bypass control valve is opened, the bypass control valve is closed after the front pressure and the rear pressure of the leakage protection valve 9 are balanced, and the pressure measurement device is in a commissioning state.

The survey pipeline in this embodiment sets up the leakage protection valve, and when the unexpected leakage appears in leakage protection valve downstream side, the valve ball of leakage protection valve goes upward in order to cooperate with last valve seat under the gas pressure effect, but self-closing measures the pipeline. When the filter and the pressure change sensor are disassembled, if the measurement control valve is not closed tightly, the leakage protection valve can automatically close the measurement pipeline, so that the safety is ensured. Moreover, between dismantling filter and pressing the variable sensor, can switch on last air discharge way earlier, avoid taking the pressure to operate, prevent that the pipeline interface from collapsing suddenly and opening the cutting ferrule screw thread damage that causes, can use in the high sulphur gas field gathering pipe network pressure measurement who easily takes place to pack.

The utility model provides a gas field pipeline pressure measurement device's embodiment 2:

the difference from example 1 is mainly that: in example 1, an upper evacuation gas line and a lower evacuation gas line were connected to the measurement piping. In this embodiment, only the upper evacuation gas path or only the lower evacuation gas path may be connected to the measurement pipeline, and at this time, the single evacuation gas path may be communicated with the collection container to guide the gas in the corresponding pipe section of the measurement pipeline to the collection container.

The utility model provides a gas field pipeline pressure measurement device's embodiment 3:

the difference from example 1 is mainly that: in example 1, the inner peripheral surface of the lower holder was provided with a guide groove extending in the vertical direction and having both ends open. In this embodiment, the lower support may be provided with a flow guide hole extending in the vertical direction and having two open ends, so as to prevent the valve ball from blocking the gas passage when seated on the lower support. Of course, in other embodiments, the diversion trench and the diversion hole may be disposed at the same time, and the normal conduction of the gas path may also be ensured.

The utility model provides a gas field pipeline pressure measurement device's embodiment 4:

the difference from example 1 is mainly that: in embodiment 1, the inner peripheral surface of the lower support is of a conical structure, so that centering and positioning are facilitated. In this embodiment, the inner periphery of the lower seat may also be cylindrical in configuration, and the radial dimension may be slightly larger than the valve ball dimension.

The utility model provides a gas field pipeline pressure measurement device's embodiment 5:

the difference from example 1 is mainly that: in embodiment 1, the valve body includes valve body and lower valve body, is equipped with outlet port and last valve block on the valve body, is equipped with inlet port and lower support on the valve body down. In this embodiment, the valve body can be independent valve body, and the inside an organic whole of valve body is provided with the undersetting, and the upper valve seat can be separated body detachably fixed Assembly in the valve body inner chamber, during the installation, can place the valve ball on the undersetting earlier, and the disk seat can in the repacking assembly. Of course, in other embodiments, the lower support may be separately and detachably fitted in the inner cavity of the valve body.

The utility model provides a gas field pipeline pressure measurement device's embodiment 6:

the difference from example 1 is mainly that: in embodiment 1, the upper valve body and the lower valve body are fixedly assembled by the internal thread bush. In this embodiment, the upper valve body and the lower valve body can be fixedly assembled through a flange connection structure.

The utility model provides a gas field pipeline pressure measurement device's embodiment 7:

the difference from example 1 is mainly that: in example 1, the measurement line extends in the vertical direction as a whole. In this embodiment, the measurement pipeline may also be arranged horizontally locally as a whole, but the upper and lower vertical arrangement of the upper valve seat and the lower support of the leakage protection valve needs to be ensured, so as to ensure that the valve ball can normally fall under the action of gravity. At this time, the air inlet interface and the air outlet interface can also extend horizontally, and the middle of the air inlet interface and the middle of the air outlet interface can be correspondingly arranged with the corresponding upper valve seat and the corresponding lower support through the bent air channel.

The utility model provides an embodiment of leakage protection valve:

the structure of the leakage prevention valve in this embodiment is the same as that of the leakage prevention valve in embodiment 1 of the pressure measurement device described above, and details thereof are not repeated.

Of course, in other embodiments, the leakage prevention valve may also adopt the structure of the leakage prevention valve in any one of the embodiments 2 to 7 of the pressure measurement device described above.

Finally, it should be noted that the above mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made without inventive effort to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A leak protection valve, comprising:

a valve body having an inlet port (22) and an outlet port (19);

the gas channel is arranged on the valve body and is communicated with the gas inlet interface (22) and the gas outlet interface (19);

a valve ball (17) is movably assembled in the gas channel, an upper valve seat (20) and a lower support (21) are arranged on the valve body corresponding to the valve ball (17), the upper valve seat (20) is used for being in sealing fit with the valve ball (17) to block the gas channel, and the lower support (21) is used for supporting the valve ball (17) falling due to gravity;

in the gas flowing direction, the gas inlet interface (22), the lower support (21), the upper valve seat (20) and the gas outlet interface (19) are arranged in sequence.

2. The leakage prevention valve according to claim 1, wherein the inner peripheral surface of the lower seat (21) is a tapered structure with a large upper part and a small lower part, the inner peripheral surface of the lower seat (21) is provided with a guide groove (18) extending along the vertical direction and having two open ends, and/or the lower seat (21) is provided with a guide hole extending along the vertical direction and having two open ends, so as to prevent the valve ball (17) from blocking the gas passage when sitting on the lower seat (21).

3. The leakage prevention valve as claimed in claim 2, wherein the inner peripheral surface of the upper seat (20) is formed in a tapered structure having a small upper portion and a large lower portion, and a lower end of the tapered inner peripheral surface of the upper seat (20) is fitted to an upper end of the tapered inner peripheral surface of the lower seat (21).

4. The leakage protection valve according to claim 1, 2 or 3, wherein the valve body comprises an upper valve body (14) and a lower valve body (15), the two valve bodies are detachably and fixedly assembled together, the upper valve body (14) is provided with the air outlet port (19) at the top end and the upper valve seat (20) at the bottom end, and the lower valve body (15) is provided with the lower support (21) at the top end and the air inlet port (22) at the bottom end.

5. The leakage prevention valve according to claim 4, wherein the upper valve body (14) and the lower valve body (15) are externally fitted with an internally threaded sleeve (16), and one of the upper valve body (14) and the lower valve body (15) is screw-fitted to the internally threaded sleeve (16) and the other is press-fitted to the internally threaded sleeve (16) to detachably fix the upper valve body (14) and the lower valve body (15) together by the internally threaded sleeve (16).

6. A gas field pipeline pressure measurement device, comprising:

the gas field pipeline (1) is fixedly connected with the gas field pipeline (2), and a measurement control valve (6), a filter (7) and a pressure measuring component are sequentially arranged on the measurement pipeline (2) along the gas flowing direction of the measurement pipeline (2);

it is characterized by also comprising:

a leakage prevention valve (9) arranged on the measuring pipeline (2) and located between the measuring control valve (6) and the filter (7), wherein the leakage prevention valve (9) adopts the leakage prevention valve of any one of claims 1 to 5, and an air inlet interface (22) of the leakage prevention valve (9) is located at the upstream of an air outlet interface (19) along the gas flow direction of the measuring pipeline (2);

the two ends of the bypass gas path (3) are connected to the measuring pipeline (2), the two ends of the bypass gas path (3) are an upstream end and a downstream end, the downstream end is positioned between the leakage protection valve (9) and the filter (7), and the upstream end is positioned at the upstream of the measuring control valve (6) along the gas flowing direction of the measuring pipeline (2);

the bypass control valve (10) is arranged on the bypass gas path (3) and can be opened to conduct the bypass gas path (3) when the pressure measuring device is put into operation, so that the upper and lower side pressures of the valve ball (17) are balanced, and the measuring pipeline (2) is normally conducted; the pressure measuring device can be closed to disconnect the bypass gas circuit (3) after being put into operation, and when leakage occurs on the measuring pipeline (2) at the downstream of the leakage protection valve (9), the leakage protection valve (9) can be normally closed to disconnect the measuring pipeline (2).

7. Gas field pipeline pressure measuring device according to claim 6, characterized in that an upper evacuation gas circuit (4) and/or a lower exhaust gas circuit (5) is connected to the measuring pipeline (2), the upper evacuation gas circuit (4) has an upper bleed air end, the upper bleed air end is located between the filter (7) and the pressure measuring unit, the lower exhaust gas circuit (5) has a lower bleed air end, the lower bleed air end is located between the leakage prevention valve (9) and the measurement control valve (6), and the upper evacuation gas circuit (4) and/or the lower exhaust gas circuit (5) is/are adapted to guide the gas in the corresponding pipe section of the measuring pipeline (2) to the collection container (13) when conducting.

8. The gas field pipeline pressure measuring device according to claim 7, wherein when the bypass gas circuit (3) is used as a cleaning gas circuit, the bypass gas circuit (3) is communicated with the upper evacuation gas circuit (4) and/or the lower evacuation gas circuit (5) at the same time, and is used for forming a cleaning pressure difference between the upstream and downstream of the filter (7) and/or the leakage protection valve (9).

9. The gas field pipeline pressure measuring device according to claim 7 or 8, wherein when the upper evacuation gas circuit (4) and the lower evacuation gas circuit (5) are connected to the measuring pipeline (2), two rows of air circuits are respectively provided with an evacuation control valve, and share a total evacuation gas circuit, and the total evacuation gas circuit is used for being inserted into the collecting container (13) so as to guide gas led out from the two evacuation gas circuits to the collecting container (13).

10. Gas field pipe pressure measuring device according to claim 9, characterized in that it further comprises said collecting container (13), said total evacuation gas circuit being correspondingly sealingly inserted into said collecting container (13).