CN213874941U - Online calibration equipment of guide's formula relief valve - Google Patents
Online calibration equipment of guide's formula relief valve Download PDFInfo
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- CN213874941U CN213874941U CN202022406355.4U CN202022406355U CN213874941U CN 213874941 U CN213874941 U CN 213874941U CN 202022406355 U CN202022406355 U CN 202022406355U CN 213874941 U CN213874941 U CN 213874941U
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- safety valve
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- auxiliary medium
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Abstract
An online checking device for a pilot operated safety valve comprises an auxiliary medium storage unit for storing an auxiliary medium, a pressure reducer for adjusting the auxiliary medium pressure input into the pilot operated safety valve from the auxiliary medium storage unit, and a safety valve connected with the pressure reducer and used for relieving the pressure of the auxiliary medium. Compared with the prior art, the utility model discloses a security when leading formula relief valve on-line calibration equipment can improve the check-up.
Description
Technical Field
The utility model relates to a relief valve check-up field especially relates to an online calibration equipment of guide's formula relief valve.
Background
Natural gas and liquefied petroleum gas are widely used in life. In order to ensure safe use and control the conveying pressure, a safety valve is often arranged on the conveying pipeline or equipment. The safety valve is in a state of being isolated from the outside under normal conditions, when the delivery pressure of the medium in the pipeline rises to exceed the rated pressure, partial medium is discharged outside the pipeline through the safety valve to release the pressure, and therefore the pressure value in the pipeline is maintained in the rated range. One of the safety valves is a pilot operated safety valve. The pilot operated safety valve has good sealing performance, and the action is basically not influenced by back pressure during discharge, so the pilot operated safety valve is widely installed on pipelines of natural gas distribution stations and storage tanks of liquefied petroleum gas filling stations in recent years and is special pressure-bearing equipment for protecting possible overpressure. The pilot operated safety valve mainly comprises a main valve, a pilot valve and a connecting pipeline connected between the main valve and the pilot valve. The opening and closing of the main valve are driven or controlled by the pilot valve. When the pressure in the pipe reaches the rated pressure, the pilot valve is opened and then triggers the main valve to open, the medium is rapidly discharged from the main valve to the outside, and the pressure in the pipe is reduced along with the discharge of the medium. When the pressure in the conduit drops below the nominal pressure, the pilot valve closes, which in turn triggers the main valve to close.
Specifically, referring to fig. 1, the patent application No. 201910035415.5 discloses a pilot operated safety valve including a main valve 1 connected between the outside and a pipe 100, a pilot valve 2 connected between the main valve 1 and the outside, a first connection pipe 3, a second connection pipe 4, and a filter 5 provided on the second connection pipe 4. A movable main valve core 6 and a main valve lower valve cavity 7 communicated with the pipeline 100 are arranged in the main valve 1, and the main valve lower valve cavity 7 is communicated or separated with the outside along with the movement of the main valve core 6 so as to realize the communication or separation of the outside and the pipeline 100. A movable pilot valve core 8 and a pilot valve lower valve cavity 9 communicated with the main valve lower valve cavity 7 are arranged in the pilot valve 2, and the pilot valve lower valve cavity 9 is communicated or separated with the outside along with the movement of the pilot valve core 8. The first connecting pipe 3 is connected between the pilot valve lower valve cavity 9 and one end of the main valve 1 far away from the main valve lower valve cavity 7, and the second connecting pipe 4 is connected between the main valve lower valve cavity 7 and the pilot valve lower valve cavity 9. When the pressure in the pipeline 100 is lower than the nominal pressure of the pilot-operated safety valve, the main valve spool 6 and the pilot valve spool 7 are both in a state of isolating the main valve 1 and the pilot valve 2 from the outside, and the medium in the pipeline 100 is not discharged to the outside. When the pressure in the pipeline 100 is increased and exceeds the nominal pressure, the pilot valve spool 8 moves upwards, the pilot valve lower valve cavity 9 is communicated with the outside, a small amount of medium flows out from the pipeline 100 to the outside through the second connecting pipe 4 and the pilot valve lower valve cavity 9 in sequence, and under the throttling action of the filter 5, the medium outflow speed in the pilot valve lower valve cavity 9 is higher than the medium inflow speed flowing out of the pilot valve lower valve cavity 9 from the pipeline 100, so that pressure difference is generated in the pilot valve 2. Under the action of the pressure difference, the medium in the main valve 1 on the side far from the pipeline 100 flows to the pilot valve lower valve cavity 9 along the first connecting pipe 3 and flows out of the outside, so that the pressure difference is also generated on the main valve core 6. The main valve spool 6 moves in a direction to communicate the outside with the main valve lower valve chamber 7, and a large amount of the medium in the pipe 100 is discharged from the main valve lower valve chamber 7 to the outside to quickly release the pressure in the pipe. When the pressure in the pipeline is reduced to be lower than the nominal pressure, the pilot valve core 8 moves and enables the pilot valve lower valve cavity 9 to be isolated from the outside again, under the action of pressure difference, the main valve core 6 moves towards the direction of isolating the main valve lower valve cavity 7 from the outside again and enables the pipeline 100 to be isolated from the outside again, and therefore the process of adjusting the internal pressure of the pipeline 100 and sealing again is completed once.
Meanwhile, according to the stipulation of TSG ZF001-2006 safety technology supervision regulations, the safety valve should generally check the basic performances such as sealing performance at least once every year, and the on-line check for keeping the connection of the safety valve and the pipeline or the off-line check for separating the safety valve and the pipeline can be adopted for checking. The online verification is performed in the normal running state of the pipeline, has the advantages of no need of dismounting the safety valve, no influence on production and the like, and becomes the preferred choice for enterprises to carry out safety valve verification. For the structure of the above-mentioned pilot operated safety valve, when performing online verification, it is necessary to introduce an auxiliary medium into the main valve 1 and the pilot valve 2 through the second connecting pipe 4, and the pressure of the auxiliary medium is used to move the pilot valve spool 8 to the side where the pilot valve lower valve cavity 9 communicates with the outside, so as to move the main valve spool 6 to the side where the main valve lower valve cavity 7 communicates with the outside, so as to verify whether the pilot operated safety valve can be opened normally for pressure relief. However, in order to ensure that the introduced auxiliary medium has sufficient pressure to push the pilot valve spool 8 to move, the auxiliary medium is generally high-pressure gas, and if the auxiliary medium is directly connected with the pilot safety valve, certain influence is caused on the pressure in the pilot safety valve system, and even safety accidents such as explosion occur.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model aims at providing a high online calibration equipment of guide's formula relief valve of security.
The utility model discloses a following scheme realizes:
an online checking device for a pilot operated safety valve comprises an auxiliary medium storage unit for storing an auxiliary medium, a pressure reducer for adjusting the auxiliary medium pressure input into the pilot operated safety valve from the auxiliary medium storage unit, and a safety valve connected with the pressure reducer and used for relieving the pressure of the auxiliary medium.
Compared with the prior art, the utility model discloses an online calibration equipment of guide's formula relief valve steps down high-pressure auxiliary medium through the pressure reducer to the normal work of cooperation relief valve in order to protect the pressure reducer, auxiliary medium pressure within a certain range in the control input guide's formula relief valve, thereby improves the security.
Further, the setting pressure of the safety valve is equal to the nominal pressure of the pilot operated safety valve. Therefore, the auxiliary medium input into the pilot operated safety valve is ensured not to exceed the nominal pressure of the pilot operated safety valve, and the normal work of the pilot operated safety valve is ensured.
Further, still include detecting element, detecting element includes the detection the second manometer of pressure reducer export pressure. The pressure of the auxiliary medium input into the pilot operated safety valve can be detected by the second pressure gauge.
Further, the detection unit further comprises a first pressure gauge for detecting the outlet pressure of the auxiliary medium storage unit, and the pressure reducer is located between the first pressure gauge and the second pressure gauge. The pressure entering the pressure reducer is slowly increased through the first pressure gauge, and the function of protecting the online checking device of the pilot operated safety valve is achieved.
Further, the detection unit further comprises a third pressure gauge which is arranged between the pilot operated safety valve and the pressure gauge and is used for detecting the pressure in the pilot operated safety valve loop. The second pressure gauge is matched with the third pressure gauge together to verify whether the pilot operated safety valve works normally or not.
The pressure gauge further comprises a connecting unit, wherein the connecting unit comprises a ball valve connected between the pilot operated safety valve and the pressure gauge, and the ball valve is communicated with the outside when opened. The ball valve can discharge residual auxiliary media remained in the pilot operated safety valve online verification device.
Further, the connecting unit further comprises a check valve, and the check valve is connected between the pressure gauge and a main valve lower valve cavity of the pilot-operated safety valve so as to ensure that the auxiliary medium flows into the main valve lower valve cavity in a one-way mode. The check valve can prevent the medium in the pipeline from flowing into the pilot operated safety valve on-line calibration device.
Further, the auxiliary medium storage unit is a nitrogen high-pressure gas cylinder and is provided with a cylinder valve.
For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a prior art pilot operated safety valve;
fig. 2 is the overall structure schematic diagram of the on-line checking device for the pilot operated safety valve of the present invention.
Detailed Description
Specifically, please refer to fig. 2, the online checking apparatus for a pilot operated safety valve of the present invention includes an auxiliary medium storage unit 10 for storing a high-pressure auxiliary medium, a pressure reducer 20 connected to the auxiliary medium storage unit 10 and used for adjusting the auxiliary medium pressure of the input pilot operated safety valve, a safety valve 30 for releasing the pressure of the pressure reducer 20, a detection unit 40 for detecting the pressure in the loop, and a connection unit connected between the auxiliary medium storage unit 10, the pressure reducer 20, the safety valve 30, the detection unit 40 and the pilot operated safety valve.
The auxiliary medium storage unit 10 is generally a steel cylinder or a fiber-wound gas cylinder, and in this embodiment, the auxiliary medium storage unit 10 is a gas cylinder filled with high-pressure nitrogen gas and provided with a cylinder valve for controlling the opening and closing of the gas cylinder. The outflow port of the auxiliary medium storage unit 10 is connected to the inlet of the pressure reducer 20, and the medium output from the auxiliary medium storage unit 10 is reduced by the throttling action of the pressure reducer 20 and controlled to a constant value. The safety valve 30 is provided on the pressure reducer 20, and when the pressure of the auxiliary medium flowing into the pressure reducer 20 exceeds the rated pressure value of the pressure reducer 20, the safety valve 30 is opened to release the pressure reducer 20 to prevent the high-pressure medium from damaging the pressure reducer 20; preferably, the setting pressure of the relief valve 30 is equal to the nominal pressure of the pilot operated relief valve.
The connection unit 50 includes a first T-joint 51 provided with three openings, and a hose (not shown), which is a pressure-resistant hose in this embodiment. The outlet of the pressure reducer 20 is connected with one end opening of the first T-shaped joint 51, one of the other two openings of the first T-shaped joint 51 is connected with the pilot valve lower valve cavity 9 of the pilot valve 2 after being connected with the filter 5 through the hose, the other one is connected with the main valve lower valve cavity 7 of the main valve 1 through the hose, and the communication among the pressure reducer 20, the pilot valve lower valve cavity 9 and the main valve lower valve cavity 7 is realized through the first T-shaped joint 51. Further, the connection unit further comprises a check valve 53, wherein the check valve 53 is connected between the first T-shaped joint 51 and the lower main valve chamber 7, and ensures that the auxiliary medium flows into the lower main valve chamber 7 in a single direction.
The detection unit 40 includes a first pressure gauge 41 provided at an outlet of the auxiliary medium storage unit 10 and a second pressure gauge 42 provided at an outlet of the pressure reducer 20. Further, the detecting unit 40 further includes a third pressure gauge 43 connected between the pilot operated safety valve and the pressure reducer 20 and detecting a pressure in the pilot operated safety valve circuit, and the connecting unit 50 further includes a second T-joint 52. The third pressure gauge 43 is connected between the outlet of the pressure reducer 20 and the first T-joint 51 through the second T-joint 52. Further, the detecting unit 40 further includes a third T-joint 55 and a ball valve 54, the third T-joint 55 is connected between the second T-joint 52 and the third pressure gauge 43, and is communicated with the ball valve 54, after the verification is finished, the main valve 1 and the pilot valve 2 are in a state of being blocked from the outside, and the ball valve 54 is opened to discharge residual media remaining in the pilot operated safety valve online verifying unit and the pilot operated safety valve.
Based on the structure of the above-mentioned pilot operated safety valve online verification device, a verification process will now be described, in which the pilot operated safety valve is kept connected to the pipe 100, and the main valve 1 and the pilot valve 2 are kept in a state of being blocked from the outside before the auxiliary medium storage unit 10 is opened:
firstly, obtaining the setting pressure of a pilot operated safety valve
Firstly, the cylinder valve of the auxiliary medium storage unit 10 is opened and the pressure reducer 20 is slowly adjusted by reading the reading of the first pressure gauge 4, the auxiliary medium flows out from the auxiliary medium storage unit 10 and sequentially passes through the pressure reducer 20, the second T-shaped joint 52 and the first T-shaped joint 51, then simultaneously flows into the main valve lower valve cavity 7 and the pilot valve lower valve cavity 9, and the pilot valve core 8 moves under the action of pressure difference and enables the pilot valve 2 to be communicated with the outside. In the process, whether a medium flows out from the connection position of the pilot valve 2 and the outside is detected by hearing the sound of the connection position of the pilot valve 2 and the outside through ears or detecting by arranging an air pressure sensor at the connection position of the pilot valve 2 and the outside, and the detection means is a conventional arrangement in the prior art, so that detailed description is not provided. When the pilot valve 2 is detected to have medium overflow, reading the readings of the second pressure gauge 42 and the third pressure gauge 43, and when the pilot safety valve online checking device does not have the air tightness problem, the readings of the second pressure gauge 42 and the third pressure gauge 43 are the same, and the value is the setting pressure of the pilot safety valve.
(II) checking the opening and closing performance of the pilot operated safety valve
Firstly, the cylinder valve of the auxiliary medium storage unit 10 is opened, the pressure reducer 20 is slowly adjusted by reading the reading of the first pressure gauge 4, the auxiliary medium flows out from the auxiliary medium storage unit 10 and sequentially passes through the pressure reducer 20, the second T-shaped joint 52 and the first T-shaped joint 51, then simultaneously flows into the main valve lower valve cavity 7 and the pilot valve lower valve cavity 9, the pilot valve core 8 moves under the action of pressure difference and opens the pilot valve 2, so that the main valve core 6 is triggered to move and open the main valve 1, the main valve 1 is communicated with the outside to release pressure, until the pressure in the pilot operated safety valve is reduced to be lower than the nominal pressure, and the main valve core 6 returns to the original position. In the process, whether media flow out from the connection position of the pilot valve 2 and the outside and the connection position of the main valve 1 and the outside is detected by hearing sounds at the connection position of the pilot valve 2 and the outside and sounds at the connection position of the main valve 1 and the outside through ears, or detecting whether media flow out from the connection position of the pilot valve 2 and the outside and the connection position of the main valve 1 and the outside through air pressure sensors arranged at the connection position of the pilot valve 2 and the connection position of the main valve 1 and the outside, and further detecting whether media flow out from the connection position of the pilot valve 2 and the connection position of the main valve 1 and the outside when the main valve 1 and the pilot valve 2 are restored to the state of being separated from the outside, so that whether the opening and closing performance of the pilot operated safety valve is in the normal working state is judged.
(III) checking the sealing performance of the pilot operated safety valve
Firstly, the cylinder valve of the auxiliary medium storage unit 10 is opened and the pressure reducer 20 is slowly adjusted by reading the reading of the first pressure gauge 4, the auxiliary medium flows out from the auxiliary medium storage unit 10 and sequentially passes through the pressure reducer 20, the second T-shaped joint 52 and the first T-shaped joint 51, then simultaneously flows into the main valve lower valve cavity 7 and the pilot valve lower valve cavity 9, the pilot valve core 8 moves under the action of pressure difference and opens the pilot valve 2, and the pilot valve 2 is communicated with the outside. Then, the pressure reducer 20 is adjusted to reduce the reading of the second pressure gauge 42 to 90% of the set pressure of the safety valve 30, the auxiliary medium storage unit 10 is closed, the readings of the second pressure gauge 42 and the third pressure gauge 43 are observed to see whether there is a decrease in the values, and whether the sealability of the pilot operated safety valve is acceptable or not is determined.
Compared with the prior art, the utility model discloses an online calibration equipment of guide's formula relief valve passes through pressure reducer cooperation relief valve, when protecting the normal work of pressure reducer, and the auxiliary medium pressure within a certain range in the control input guide's formula relief valve to improve the security. And the detection unit is arranged, so that various performances of the pilot operated safety valve can be verified. And residual auxiliary media after the verification is finished can be discharged in a directional mode, and the safety is further improved. In addition, the check valve is matched to ensure that the normal work of the pilot operated safety valve is not influenced during the check.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (6)
1. The utility model provides a pilot-operated formula relief valve online calibration equipment which characterized in that: the auxiliary medium pressure regulator comprises an auxiliary medium storage unit for storing an auxiliary medium, a pressure reducer for regulating the auxiliary medium pressure input into a pilot type safety valve by the auxiliary medium storage unit, and a safety valve connected with the pressure reducer and used for relieving the pressure reducer; still include the detecting element, the detecting element is including detecting the second manometer of pressure reducer exit pressure and detection the first manometer of auxiliary medium storage unit exit pressure, the pressure reducer is located first manometer with between the second manometer.
2. The pilot operated safety valve online verification device according to claim 1, characterized in that: the setting pressure of the safety valve is equal to the nominal pressure of the pilot operated safety valve.
3. The pilot operated safety valve online verification device according to claim 1, characterized in that: the detection unit further comprises a third pressure gauge which is arranged between the pilot operated safety valve and the pressure reducer and is used for detecting the pressure in the pilot operated safety valve loop.
4. The pilot operated safety valve online verification device according to claim 3, wherein: the pressure reducer is characterized by further comprising a connecting unit, wherein the connecting unit comprises a ball valve connected between the pilot operated safety valve and the pressure reducer, and the ball valve is communicated with the outside when opened.
5. The pilot operated safety valve online verification device according to claim 4, wherein: the connecting unit further comprises a check valve, and the check valve is connected between the pressure reducer and a main valve lower valve cavity of the pilot-operated safety valve so as to ensure that the auxiliary medium flows into the main valve lower valve cavity in a one-way mode.
6. The pilot operated safety valve online verification device according to claim 5, wherein: the auxiliary medium storage unit is a nitrogen high-pressure gas cylinder and is provided with a cylinder valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022406355.4U CN213874941U (en) | 2020-10-26 | 2020-10-26 | Online calibration equipment of guide's formula relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022406355.4U CN213874941U (en) | 2020-10-26 | 2020-10-26 | Online calibration equipment of guide's formula relief valve |
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| Publication Number | Publication Date |
|---|---|
| CN213874941U true CN213874941U (en) | 2021-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022406355.4U Active CN213874941U (en) | 2020-10-26 | 2020-10-26 | Online calibration equipment of guide's formula relief valve |
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|---|---|
| CN (1) | CN213874941U (en) |
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2020
- 2020-10-26 CN CN202022406355.4U patent/CN213874941U/en active Active
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