CN114321462A - Differential pressure control cut-off and relief device and differential pressure control cut-off system - Google Patents
Differential pressure control cut-off and relief device and differential pressure control cut-off system Download PDFInfo
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 59
- 239000003345 natural gas Substances 0.000 claims abstract description 51
- 239000012530 fluid Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 15
- 230000009471 action Effects 0.000 abstract description 12
- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
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Abstract
The application provides a pressure differential control cuts bleeder mechanism and pressure differential control system of cutting belongs to pipeline safety technical field. The valve body is provided with two symmetrical valve cavities, and the two valve cavities are symmetrically provided with the valve core and the elastic part, so that the device can have the functions of cutting off and releasing natural gas at the upstream and the downstream, specifically, when the pressure difference between the upstream and the downstream of the elastic part is zero or smaller, the elastic part is in a free state, the disc is positioned between the first port and the sleeve, and the position of the disc is kept unchanged, and the pressure difference between the upstream and the downstream is also unchanged; if the electromagnetic valve is not closed tightly, natural gas at the upstream of the electromagnetic valve slowly leaks into a pipeline between the electromagnetic valve, the device and the overpressure stop valve, and because the pressure difference between the upstream and the downstream of the device is small, the disk in the device can be kept unchanged or only slightly moves, so that the spaces between the upstream and the downstream are always communicated, and the natural gas at the upstream can flow to the downstream through the channel, so that the mistaken cut-off action of the overpressure stop valve can not be caused.
Description
Technical Field
The application relates to the technical field of pipeline safety, in particular to a differential pressure control cut-off and discharge device and a differential pressure control cut-off system.
Background
In the natural gas transmission pipeline, a differential pressure control cut-off system is installed at intervals, and the structure of the system is as follows: the pipeline is provided with an overpressure stop valve, and a control unit in the overpressure stop valve is communicated with the downstream of the pipeline through a one-way valve, wherein the one-way valve only allows natural gas to flow in the direction from the downstream to the upstream. When the pressure downstream of the pipeline rises, the overpressure shutoff valve can shut off the transmission of natural gas based on the pressure change, and natural gas upstream of the overpressure shutoff valve is prevented from being continuously supplemented to the downstream of the overpressure shutoff valve. In the above-described configuration, the control unit of the overpressure shutoff valve is also connected upstream of the pipeline via a solenoid valve, and when the solenoid valve is opened, natural gas upstream of the pipeline is replenished in large quantities to the control unit of the overpressure shutoff valve, and the overpressure shutoff valve can also be opened.
However, after the electromagnetic valve is used for a long time, due to the abrasion of the structure, the electromagnetic valve may be closed untight, so that the natural gas at the upstream slowly leaks to a control unit of the overpressure shutoff valve, and the overpressure shutoff valve is mistakenly shut off.
Disclosure of Invention
The embodiment of the application provides a differential pressure control cuts bleeder mechanism and differential pressure control cuts system, can avoid the mistake of superpressure trip valve to cut off the action after the solenoid valve wearing and tearing. The technical scheme is as follows:
in one aspect, a differential pressure controlled shut off vent apparatus is provided, the apparatus comprising: the valve comprises a valve body, two valve cores and two elastic pieces;
the valve body is provided with two symmetrical valve cavities, each valve cavity is provided with a first port and a second port, a valve core and an elastic piece are arranged in each valve cavity, and the valve core is connected with the elastic piece;
the valve core comprises: the valve comprises a first circular ring, a disc and a second circular ring which are sequentially connected, wherein the first circular ring is provided with a radial first opening, the disc is provided with a fluid passage communicated with an outer wall and close to the end face of the second circular ring, the second circular ring is provided with a radial second opening, the diameter of the disc is larger than that of the first circular ring and the second circular ring, and a passage for fluid flow is formed among the first opening, a gap between the disc and the inner wall of a valve cavity and the second opening;
the inner wall of the valve body is provided with a sleeve, the elastic piece is positioned in the sleeve, the end part of the sleeve is used for clamping the disc, and when the elastic piece is in a free state, the disc is positioned between the first port and the sleeve.
In one possible design, the valve body further includes: two valve sleeves;
the outer wall of the sleeve is provided with an annular bulge;
the two valve sleeves are symmetrically connected to two ends of the sleeve and are abutted against the annular bulge.
In one possible design, an O-ring and a sealing baffle are provided between the sleeve and the valve housing;
the first end of the sealing baffle abuts against the annular bulge, and the O-shaped ring is located at the second end of the sealing baffle.
In one possible design, the outer wall of the valve body is also provided with an identification ring.
In one possible design, the fluid passages in the disk include: a plurality of first channels and at least one second channel;
the first channels are radially distributed along the radial direction;
the second channel is communicated with at least one first channel and the end face of the disc close to the second circular ring.
In one possible design, the edge of the disc adjacent to the second ring has a first chamfer;
the sleeve has a corresponding second chamfer thereon.
In one possible design, the second ring and the elastic piece are connected through a clamping sleeve;
the inner wall of the end part of the clamping sleeve is provided with a clamping table used for clamping the elastic piece, and the clamping sleeve can slide in the sleeve.
In one possible design, a third ring is connected to the second ring;
the diameter of the third circular ring is matched with the clamping table and is used for being inserted into the clamping table;
the diameter of the second ring is larger than the diameter of the third ring.
In one aspect, a differential pressure controlled shut-off system is provided, the system comprising: a pressure differential controlled shut off relief device, as well as overpressure shut off valves, needle valves, solenoid valves, as provided in any of the above possible designs;
the overpressure stop valve is connected in a natural gas pipeline;
the needle valve, the electromagnetic valve and the pressure difference control cut-off and relief device are connected, the needle valve is communicated with a natural gas pipeline at the upstream of the overpressure stop valve, and the pressure difference control cut-off and relief device is communicated with a natural gas pipeline at the downstream of the overpressure stop valve;
the control unit on the overpressure stop valve is connected between the electromagnetic valve and the differential pressure control cutoff and relief device.
In one possible design, the system further includes: a filter;
the filter is connected between the needle valve and the solenoid valve.
According to the technical scheme provided by the embodiment of the application, the two symmetrical valve cavities are arranged in the valve body, and the valve core and the elastic part are symmetrically arranged in the two valve cavities, so that the device can have the functions of intercepting and releasing natural gas at the upstream and the downstream; if the electromagnetic valve is not closed tightly, natural gas at the upstream of the electromagnetic valve slowly leaks into a pipeline between the electromagnetic valve, the device and the overpressure stop valve, and because the pressure difference between the upstream and the downstream of the device is small, the disk in the device can be kept unchanged or only slightly moves, so that the spaces between the upstream and the downstream are always communicated, and the natural gas at the upstream can flow to the downstream through the channel, so that the mistaken cut-off action of the overpressure stop valve can not be caused.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a differential pressure control cut-off vent apparatus provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a differential pressure control block and bleed system according to an embodiment of the present disclosure.
The reference numerals for the various parts in the drawings are illustrated below:
1-a valve body;
11-a first port;
12-a second port;
13-a sleeve;
131-a second chamfer;
14-a valve housing;
15-O-ring;
16-a sealing baffle;
17-an identification ring;
2-a valve core;
21-a first circular ring;
22-a disc;
221-a fluid channel;
2211 — a first lane;
2212-a second channel;
222-first chamfer;
23-a second ring;
24-a stop sleeve;
25-a third ring;
3-an elastic member.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a differential pressure control cutoff relief device provided in an embodiment of the present application, please refer to fig. 1, the device includes: the valve comprises a valve body 1, two valve cores 2 and two elastic pieces 3; the valve body 1 is provided with two symmetrical valve cavities, each valve cavity is provided with a first port 11 and a second port 12, a valve core 2 and an elastic piece 3 are arranged in the valve cavity, and the valve core 2 is connected with the elastic piece 3; the valve element 2 includes: a first ring 21, a disc 22 and a second ring 23 connected in sequence, the first ring 21 having a first radial opening, the disc 22 having a fluid passage 221 communicating with the outer wall and near the end face of the second ring 23, the second ring 23 having a second radial opening, the disc 22 having a diameter larger than the first ring 21 and the second ring 23, the first opening, a gap between the disc 22 and the inner wall of the valve chamber, and a passage for fluid flow formed between the second opening; the inner wall of the valve body 1 is provided with a sleeve 13, the elastic part 3 is positioned in the sleeve 13, the end part of the sleeve 13 is used for clamping the disc 22, and when the elastic part 3 is in a free state, the disc 22 is positioned between the first port 11 and the sleeve 13.
The working principle of the device is described in detail below:
in the above-described device, the valve body 1, which serves as a housing of the entire device and has a function of protecting parts therein, may be a cast cylindrical part having an inner cavity for fluid flow therein, and both ends of the valve body 1 are used for connection to pressure introduction pipes through which the device is connected to pipes upstream and downstream of the overpressure cutoff valve.
The two valve elements 2 and the two elastic elements 3 are respectively arranged symmetrically, so that the device can realize the intercepting and discharging functions no matter the pressure difference between the upstream and the downstream of the device is positive, negative or zero. The operation of the device will now be described based on the upstream spool 2 and spring 3 and the downstream spool 2 and spring 3.
Working condition 1: and (4) working normally.
After the device is installed, the upstream of the device is respectively connected with the electromagnetic valve and the control unit on the overpressure stop valve through a three-way pipeline, under the normal working condition, the pressure difference between the upstream and the downstream of the device is zero, and the device can play a pipeline role, namely natural gas between the upstream and the downstream of the device can freely circulate.
Working condition 2: the downstream pressure gradually rises.
If the pipeline pressure at the downstream of the device gradually rises, the valve core 2 and the elastic element 3 at the downstream in the device can slightly move upstream, but can still maintain the communication between the upstream and the downstream, so that the natural gas at the downstream can be supplemented to the upstream, and because the three-way pipeline area arranged on the device is in a sealed state, the pressure of the three-way pipeline area can rise along with the downstream until reaching the preset pressure range corresponding to the control unit on the overpressure cut-off valve, and the control unit controls the overpressure cut-off valve to perform a cut-off action, so that the natural gas at the upstream of the overpressure cut-off valve can not flow downstream any more, and the normal function of the overpressure cut-off valve is realized.
Working condition 3: the solenoid valve is opened.
In the production process, in an emergency, in order to disconnect the natural gas transportation process in the natural gas pipeline, an operator may control the solenoid valve. Specifically, by controlling the opening of the electromagnetic valve, a large amount of natural gas at the upstream of the electromagnetic valve is conveyed to a three-way pipeline area, so that the upstream valve core 2 and the upstream elastic part 3 in the device are subjected to large pressure, the elastic part 3 is compressed, the valve core 2 moves towards the sleeve 13 until the valve core abuts against the sleeve 13, a main channel in the device is blocked, and large-scale pressure relief can not be carried out. Then, the pressure in the three-way pipeline area rises to reach the preset pressure range corresponding to the control unit on the cut-off valve, and the control unit controls the overpressure cut-off valve to perform the cut-off action, so that the natural gas on the upstream of the overpressure cut-off valve can not flow to the downstream any more, and the cut-off process of the overpressure cut-off valve is manually controlled.
Working condition 4: the solenoid valve fails.
If the electromagnetic valve at the upstream of the device fails, natural gas leaks into the three-way pipeline slowly, the valve core 2 and the elastic element 3 at the upstream of the device can slightly move downstream, but the communication between the upstream and the downstream can be still maintained, therefore, the natural gas leaking into the three-way pipeline by the electromagnetic valve can continue to flow slowly to the downstream through the device, so that the pressure in the three-way pipeline cannot be continuously increased, and a preset pressure range corresponding to a control unit on the overpressure cut-off valve cannot be reached, therefore, the overpressure cut-off valve cannot execute a false cut-off action in the case of the failure of the electromagnetic valve.
Working condition 5: the overpressure stop valve is reset.
After the overpressure cut-off valve performs the cutting-off action, if the electromagnetic valve is in a closed state, because the fluid channel 221 which is communicated with the outer wall and is close to the end face of the second circular ring 23 exists in the circular discs 22 of the two valve cores 2 of the device, the fluid channel 221 can allow natural gas in the three-way pipeline to be slowly released to the downstream, and when the pressure of the natural gas in the three-way pipeline is lower than a preset pressure range, the overpressure cut-off valve is reset.
According to the device provided by the embodiment of the application, the two symmetrical valve cavities are arranged in the valve body 1, and the valve core 2 and the elastic part 3 are symmetrically arranged in the two valve cavities, so that the device can have the functions of intercepting and discharging the natural gas at the upstream and the downstream, specifically, when the pressure difference between the upstream and the downstream of the elastic part 3 is zero or smaller, the elastic part 3 is in a free state, the disc 22 is positioned between the first port 11 and the sleeve 13, and the position of the disc 22 is kept unchanged, and the pressure difference between the upstream and the downstream is also unchanged; if the electromagnetic valve is not closed tightly, natural gas at the upstream of the electromagnetic valve slowly leaks into a pipeline between the electromagnetic valve, the device and the overpressure stop valve, and because the pressure difference between the upstream and the downstream of the device is small, the disc 22 in the device can be kept unchanged or only slightly moves, so that the spaces between the upstream and the downstream are always communicated, and the natural gas at the upstream can flow to the downstream through the channel, so that the mistaken cut-off action of the overpressure stop valve cannot be caused.
The following details the structure and the working principle of each part of the device:
in one possible design, the valve body 1 further comprises: two valve housings 14; the outer wall of the sleeve 13 is provided with an annular bulge; two valve sleeves 14 are symmetrically connected to two ends of the sleeve 13 and abut against the annular protrusion.
In the above configuration, the sleeve 13 is cylindrical, both end portions of the inner wall thereof serve as the sleeve 13 to lock the disc 22, the elastic member 3 is also located in the sleeve 13, and the inner diameter of the joint between the two sleeves 13 is smaller than the diameter of the elastic member 3 to lock the end portions of the elastic member 3.
In a possible design, the valve housing 14 and the sleeve 13 may be connected by a screw thread, in particular, both ends of the sleeve 13 are provided with an external screw thread, and the inner wall of the valve housing 14 is provided with a corresponding internal screw thread, thereby facilitating the detachment and connection between the sleeve 13 and the valve housing 14.
In one possible design, there is an O-ring 15 and a sealing baffle 16 between the sleeve 13 and the valve housing 14; a first end of the sealing baffle 16 abuts against the annular protrusion, and the O-ring 15 is located at a second end of the sealing baffle 16.
The O-ring 15 and the sealing baffle 16 together provide a seal so that natural gas does not leak out of the gap between the sleeve 13 and the valve housing 14.
In particular, the O-ring 15 may be made of a rubber material, and the sealing baffle 16 is used for blocking the sealing ring.
In a possible design, the outer wall of the valve body 1 is further provided with an identification ring 17 for identifying the device, and the identification ring 17 may be made of plastic material and has a color with strong identification, such as yellow, so as to enhance the identification effect.
In one possible design, the fluid passages 221 in the disk 22 include: a plurality of first passages 2211 and at least one second passage 2212; a plurality of the first passages 2211 are radially distributed; the second passage 2212 communicates at least one of the first passages 2211 with the end face of the disc 22 adjacent the second ring 23.
Based on the above structure, when the valve core 2 is in a closed state abutting against the sleeve 13, a passage for fluid flow is formed among the first port 11, the first opening, the gap between the disc 22 and the inner wall of the valve cavity, the first passage 2211, the second passage 2212 and the second port 12, so that the natural gas is slowly released from the end with high pressure to the end with low pressure, thereby realizing the release.
In a possible design, the edge of the disc 22 close to the second ring 23 has a first chamfer 222; the sleeve 13 has a corresponding second chamfer 131 thereon.
The first chamfer 222 and the second chamfer 131 are attached to each other to attach the disc 22 to the second ring 23, and the chamfers can improve the sealing effect between the disc 22 and the sleeve 13, so that the natural gas can be completely prevented from flowing when the disc 22 and the sleeve are in a sealing state.
In a possible design, the second ring 23 and the elastic element 3 are connected by a stop sleeve 24; the inner wall of the end of the locking sleeve 24 has a locking table for locking the elastic member 3, and the jam sleeve is slidable in the sleeve 13.
In the above design, the second ring 23 is connected with the clamping sleeve 24, the clamping sleeve 24 is connected with the elastic member 3, and the elastic member 3 is located in the clamping sleeve 24 and can be used for righting the elastic member 3, so that the elastic member 3 is prevented from generating radial deformation or distortion in the compression or extension process, the elastic member 3 is protected, and the service life of the elastic member 3 is prolonged. In the process of moving the valve core 2 and the elastic piece 3, the cutting sleeve always moves along with the valve core, and the outer wall of the cutting sleeve and the inner wall of the valve cavity slide relatively.
In one possible design, the elastic member 3 is a spring, and the inside of the spring can allow fluid to pass through and has strong fatigue resistance.
In one possible design, a third ring 25 is also connected to the second ring 23; the diameter of the third ring 25 is adapted to the locking table for inserting into the locking table; the diameter of the second ring 23 is larger than the diameter of the third ring 25.
Based on the above structure, after flowing through the second opening in the second ring 23, the fluid can continue to flow into the inner cavity of the elastic member 3 through the inner cavity of the third ring 25, or flow in the opposite direction, so that the third ring 25 can play a role in supporting and connecting without affecting the flow of the fluid.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.
According to the device provided by the embodiment of the application, the two symmetrical valve cavities are arranged in the valve body 1, and the valve core 2 and the elastic part 3 are symmetrically arranged in the two valve cavities, so that the device can have the functions of intercepting and discharging the natural gas at the upstream and the downstream, specifically, when the pressure difference between the upstream and the downstream of the elastic part 3 is zero or smaller, the elastic part 3 is in a free state, the disc 22 is positioned between the first port 11 and the sleeve 13, and the position of the disc 22 is kept unchanged, and the pressure difference between the upstream and the downstream is also unchanged; if the electromagnetic valve is not closed tightly, natural gas at the upstream of the electromagnetic valve slowly leaks into a pipeline between the electromagnetic valve, the device and the overpressure stop valve, and because the pressure difference between the upstream and the downstream of the device is small, the disc 22 in the device can be kept unchanged or only slightly moves, so that the spaces between the upstream and the downstream are always communicated, and the natural gas at the upstream can flow to the downstream through the channel, so that the mistaken cut-off action of the overpressure stop valve cannot be caused.
Furthermore, the second ring 23 and the elastic member 3 are connected by a clamping sleeve 24; the inner wall of the end of the locking sleeve 24 has a locking table for locking the elastic member 3, and the jam sleeve is slidable in the sleeve 13. The stop sleeve 24 can right the elastic member 3, thereby preventing the elastic member 3 from being deformed or distorted in the radial direction during the compression or extension process, protecting the elastic member 3 and prolonging the service life of the elastic member 3. In the process of moving the valve core 2 and the elastic piece 3, the cutting sleeve always moves along with the valve core, and the outer wall of the cutting sleeve and the inner wall of the valve cavity slide relatively.
Fig. 2 is a schematic structural diagram of a differential pressure control block-and-bleed system according to an embodiment of the present application, please refer to fig. 2, which includes: a pressure differential controlled shut off relief device, as well as overpressure shut off valves, needle valves, solenoid valves, as provided in any of the above possible designs; the overpressure stop valve is connected in a natural gas pipeline; the needle valve, the electromagnetic valve and the pressure difference control cut-off and relief device are connected, the needle valve is communicated with a natural gas pipeline at the upstream of the overpressure stop valve, and the pressure difference control cut-off and relief device is communicated with a natural gas pipeline at the downstream of the overpressure stop valve; the control unit on the overpressure stop valve is connected between the electromagnetic valve and the differential pressure control cutoff and relief device.
In the normal working process of the system, natural gas flows along a natural gas pipeline and flows from the upstream to the downstream of the overpressure stop valve, a control unit is arranged at the top of the overpressure stop valve, the control unit is respectively connected with an electromagnetic valve and the differential pressure control cut-off release device through a three-way pipeline, a preset pressure range is set in the control unit, and when the gas pressure in the three-way pipeline changes, the control unit can control the opening and closing of the overpressure stop valve based on the pressure in the three-way pipeline, for example, when the pressure gradually rises from low, and when the pressure reaches the preset pressure range and is equal to or exceeds the lowest value of the preset pressure range, the control unit controls a cut-off unit in the overpressure stop valve to perform cut-off action. Under the condition that the electromagnetic valve and the differential pressure control cutoff and relief device are not reset, the pressure in the three-way pipeline is at a high level and cannot be greatly reduced, and therefore the overpressure cutoff valve keeps a cutoff state unchanged.
After the overpressure cut-off valve performs the cutting-off action, if the electromagnetic valve is in a closed state, because the fluid channel 221 which is communicated with the outer wall and is close to the end face of the second circular ring 23 exists in the circular discs 22 of the two valve cores 2 of the device, the fluid channel 221 can allow natural gas in the three-way pipeline to be slowly released to the downstream, and when the pressure of the natural gas in the three-way pipeline is lower than a preset pressure range, the overpressure cut-off valve is reset.
In one possible design, the system further includes: a filter; the filter is connected between the needle valve and the solenoid valve and is used for filtering the natural gas before the natural gas flows through the solenoid valve so as to prevent impurities from blocking the solenoid valve.
In one possible design, the system further includes: and the pressure regulating valve is used for regulating the pressure in the natural gas pipeline.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.
In the system provided by the embodiment of the application, two symmetrical valve cavities are arranged in the valve body 1, and the valve core 2 and the elastic part 3 are symmetrically arranged in the two valve cavities, so that the device can have the functions of intercepting and discharging the natural gas at the upstream and the downstream, specifically, when the pressure difference between the upstream and the downstream of the elastic part 3 is zero or smaller, the elastic part 3 is in a free state, the disc 22 is positioned between the first port 11 and the sleeve 13, and the position of the disc 22 is kept unchanged, and the pressure difference between the upstream and the downstream is also unchanged; if the electromagnetic valve is not closed tightly, natural gas at the upstream of the electromagnetic valve slowly leaks into a pipeline between the electromagnetic valve, the device and the overpressure stop valve, and because the pressure difference between the upstream and the downstream of the device is small, the disc 22 in the device can be kept unchanged or only slightly moves, so that the spaces between the upstream and the downstream are always communicated, and the natural gas at the upstream can flow to the downstream through the channel, so that the mistaken cut-off action of the overpressure stop valve cannot be caused.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A differential pressure controlled shut off vent apparatus, said apparatus comprising: the valve comprises a valve body (1), two valve cores (2) and two elastic pieces (3);
the valve body (1) is provided with two symmetrical valve cavities, each valve cavity is provided with a first port (11) and a second port (12), a valve core (2) and an elastic piece (3) are arranged in each valve cavity, and the valve core (2) is connected with the elastic piece (3);
the spool (2) includes: the valve comprises a first circular ring (21), a disc (22) and a second circular ring (23) which are connected in sequence, wherein a first radial opening is formed in the first circular ring (21), a fluid passage (221) which is communicated with the outer wall and is close to the end face of the second circular ring (23) is formed in the disc (22), a second radial opening is formed in the second circular ring (23), the diameter of the disc (22) is larger than that of the first circular ring (21) and the second circular ring (23), and a passage for fluid flow is formed among the first opening, a gap between the disc (22) and the inner wall of a valve cavity and the second opening;
the inner wall of the valve body (1) is provided with a sleeve (13), the elastic piece (3) is located in the sleeve (13), the end part of the sleeve (13) is used for clamping the disc (22), and when the elastic piece (3) is in a free state, the disc (22) is located between the first port (11) and the sleeve (13).
2. The device according to claim 1, characterized in that the valve body (1) further comprises: two valve housings (14);
the outer wall of the sleeve (13) is provided with an annular bulge;
the two valve sleeves (14) are symmetrically connected to two ends of the sleeve (13) and are abutted against the annular bulges.
3. Device according to claim 2, characterized in that between the sleeve (13) and the valve housing (14) there is an O-ring (15) and a sealing baffle (16);
the first end of the sealing baffle plate (16) is abutted against the annular bulge, and the O-shaped ring (15) is located at the second end of the sealing baffle plate (16).
4. The device according to claim 1, characterized in that the outer wall of the valve body (1) is also provided with an identification ring (17).
5. The device according to claim 1, wherein the fluid channel (221) in the disc (22) comprises: a plurality of first passages (2211) and at least one second passage (2212);
the first passages (2211) are radially distributed;
the second passage (2212) communicates at least one of the first passages (2211) with the end face of the disc (22) adjacent to the second ring (23).
6. Device according to claim 1, characterized in that the edge of the disc (22) close to the second ring (23) has a first chamfer (222);
the sleeve (13) is provided with a corresponding second chamfer (131).
7. The device according to claim 1, characterized in that the second ring (23) and the elastic element (3) are connected by a stop sleeve (24);
the inner wall of the end part of the clamping sleeve (24) is provided with a clamping table, the clamping table is used for clamping the elastic piece (3), and the paper clamping sleeve can slide in the sleeve (13).
8. The device according to claim 7, characterized in that a third ring (25) is also connected to the second ring (23);
the diameter of the third circular ring (25) is matched with the clamping table and is used for being inserted into the clamping table;
the diameter of the second ring (23) is greater than the diameter of the third ring (25).
9. A differential pressure controlled shutoff system, comprising: the differential pressure controlled shut off and release device of any of claims 1 to 8, and overpressure shut off valves, needle valves, solenoid valves;
the overpressure stop valve is connected in the natural gas pipeline;
the needle valve, the electromagnetic valve and the differential pressure control cut-off and relief device are connected, the needle valve is communicated with a natural gas pipeline on the upstream of the overpressure stop valve, and the differential pressure control cut-off and relief device is communicated with a natural gas pipeline on the downstream of the overpressure stop valve;
and a control unit on the overpressure stop valve is connected between the electromagnetic valve and the differential pressure control cutoff and relief device.
10. The system of claim 9, further comprising: a filter;
the filter is connected between the needle valve and the solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011052802.9A CN114321462B (en) | 2020-09-29 | 2020-09-29 | Differential pressure control cut-off relief device and differential pressure control cut-off system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011052802.9A CN114321462B (en) | 2020-09-29 | 2020-09-29 | Differential pressure control cut-off relief device and differential pressure control cut-off system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114321462A true CN114321462A (en) | 2022-04-12 |
| CN114321462B CN114321462B (en) | 2024-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011052802.9A Active CN114321462B (en) | 2020-09-29 | 2020-09-29 | Differential pressure control cut-off relief device and differential pressure control cut-off system |
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| CN (1) | CN114321462B (en) |
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| FR1512786A (en) * | 1966-03-01 | 1968-02-09 | Danfoss As | Improvements to double seat valves |
| JPH11287342A (en) * | 1998-02-03 | 1999-10-19 | Kurimoto Ltd | Emergency shutoff valve |
| FR2794841A1 (en) * | 1999-06-10 | 2000-12-15 | Gaz De France | Automatic flow-limiting safety valve, used in e.g. gas line vulnerable to interference, comprises rigid core with envelope inflating when excessive flow causes pressure drop exceeding specified limit |
| US20010022198A1 (en) * | 2000-03-16 | 2001-09-20 | Paloma Industries, Limited | Gas control valve in water heater |
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| CN108716558A (en) * | 2018-07-13 | 2018-10-30 | 四川长仪油气集输设备股份有限公司 | Axial-flow type safety shut-off valve and its superpressure block control system |
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|---|---|---|---|---|
| FR1512786A (en) * | 1966-03-01 | 1968-02-09 | Danfoss As | Improvements to double seat valves |
| JPH11287342A (en) * | 1998-02-03 | 1999-10-19 | Kurimoto Ltd | Emergency shutoff valve |
| FR2794841A1 (en) * | 1999-06-10 | 2000-12-15 | Gaz De France | Automatic flow-limiting safety valve, used in e.g. gas line vulnerable to interference, comprises rigid core with envelope inflating when excessive flow causes pressure drop exceeding specified limit |
| US20010022198A1 (en) * | 2000-03-16 | 2001-09-20 | Paloma Industries, Limited | Gas control valve in water heater |
| GB0204884D0 (en) * | 2002-03-01 | 2002-04-17 | Honeywell Normalair Garrett | Gas supply apparatus |
| CN201412116Y (en) * | 2009-06-12 | 2010-02-24 | 中国石油天然气股份有限公司 | Natural Gas Well Electromagnetic Pneumatic Switch Well Valve |
| CN207406858U (en) * | 2017-11-15 | 2018-05-25 | 中石油管道有限责任公司西部塔里木输油气分公司 | Automatically cut off shuttle valve |
| CN108716558A (en) * | 2018-07-13 | 2018-10-30 | 四川长仪油气集输设备股份有限公司 | Axial-flow type safety shut-off valve and its superpressure block control system |
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|---|---|
| CN114321462B (en) | 2024-07-26 |
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