CN217765416U - Portable explosion-proof miniature gas cylinder driving pilot-operated safety valve online calibration device - Google Patents

Abstract

The utility model discloses a portable explosion-proof miniature gas cylinder-driven pilot-operated safety valve on-line verification device, which comprises a portable high-pressure gas cylinder, a portable verification control cabinet, a first joint connected to a high-pressure gas cylinder connecting pipe, a gas source pressure gauge, a calibration Inspection valve, pressure relief valve, the high-pressure gas cylinder connecting pipe is connected to the high-pressure gas cylinder, and the verification valve is also connected to the second joint. The test pressure gauge is connected, the test port is connected to the high pressure hose for test, the high pressure hose for test is connected to one port of the three-way valve, and the other two ports of the three-way valve pass through the first high pressure hose and the pilot valve respectively. Connection, the second high pressure hose is connected with the main valve. The utility model does not need to disassemble the pilot safety valve, and can not only realize the set pressure verification of the pilot valve and the main valve in the pilot safety valve, but also can detect the tightness of the pilot valve and the main valve, which greatly reduces the time for verification. The labor intensity is reduced, and the calibration time is shortened.

Description

A Portable Explosion-proof Miniature Gas Cylinder-Driven Pilot-operated Safety Valve Online Calibration Device

【Technical field】

The utility model belongs to the technical field of natural gas engineering equipment detection, and in particular relates to an on-line verification device for pilot safety valves used in natural gas engineering equipment.

【Background technique】

As an automatic control valve, the safety valve is widely used in special equipment such as pressure vessels (tank trucks), pressure pipelines, and boilers. When the medium pressure in the protected equipment exceeds the preset set pressure value, the safety valve will automatically open to discharge a certain amount of medium, and when the internal pressure of the equipment drops to or slightly below the set pressure value, the valve will open Automatically closes to protect the equipment. The safety valve plays the role of overpressure protection for the safe operation of the pressure equipment. The safety valve is generally checked at least once a year, and regular checks, commissioning and maintenance of the safety valve can effectively ensure the normal operation of its functions.

Pilot-operated safety valve is a safety valve that is driven or controlled by the medium discharged from the pilot valve, and the pilot valve itself is a direct-load safety valve. The pilot-operated safety valve is a pilot mechanism added to the base of the ordinary spring-type safety valve, so that the safety valve has dual functions of the pilot-operated safety valve and the ordinary safety valve. Its characteristics are: the action is accurate and reliable, the sealing performance has been fundamentally improved, the opening and closing pressure difference is easy to meet the requirements, the action is sensitive, and the discharge volume is large. In recent years, due to its novel structure, excellent sealing, and stable discharge performance, the pilot-operated safety valve has been widely used in the fields of oil and gas, chemical industry, and city gas.

According to the structural characteristics of the pilot-operated safety valve, only the pilot valve can actually be adjusted and set during the calibration of the pilot-operated safety valve. Therefore, adjusting the pressure value of the pilot valve is the key technology and difficulty in the calibration of the pilot-operated safety valve. At present, the calibration of the pilot-operated safety valve is to remove the pilot-operated safety valve as a whole and transport it to the offline calibration platform for offline calibration. Due to the restrictions on the installation and use conditions of the safety valve, it is difficult to disassemble, hoist and install the safety valve. The workload is heavy, the calibration cost is high, and the calibration cycle is long.

【Content of utility model】

Aiming at the deficiencies in the prior art, the technical problem to be solved by this utility model is to provide a portable explosion-proof miniature gas cylinder driven pilot type safety valve on-line verification device, which solves the problem of disassembly of the safety valve due to the limitation of the installation and use conditions of the safety valve. , Hoisting and installation are relatively difficult, resulting in a large workload for safety valve calibration, high calibration costs, and long calibration cycles.

In order to solve the above technical problems, the utility model adopts the following technical scheme: a portable explosion-proof miniature gas cylinder-driven pilot type safety valve online calibration device, including a portable high-pressure gas cylinder, a portable calibration control cabinet, and the portable calibration control cabinet It is equipped with a first joint, a second joint, an air source pressure gauge, a calibration valve, a pressure relief valve, a calibration pressure gauge and a three-way valve; wherein, the first joint is connected to the connecting pipe of the high-pressure gas cylinder, the air source pressure gauge, The calibration valve, the pressure relief valve, the high-pressure gas cylinder connection pipe are connected to the high-pressure gas cylinder, and the calibration valve is also connected to the second joint. The second joint is provided with a pressure gauge mounting position and a calibration interface. The calibration pressure gauge is connected, the calibration interface is connected to the high-pressure hose for calibration, the high-pressure hose for calibration is connected to one of the ports of the three-way valve, and the other two ports of the three-way valve are respectively connected to the guide through the first high-pressure hose. The valve is connected, and the second high-pressure hose is connected with the main valve.

Preferably, the portable calibration control cabinet is also provided with a combustible gas alarm device that sends out an alarm signal when the concentration of the combustible gas is detected to reach the set explosion or poisoning alarm critical point.

Preferably, the end of the first high-pressure hose is provided with a pilot valve connection female joint matched with the pilot valve conduit connection port, and the end of the second high-pressure hose is provided with a main valve connection female joint matched with the main valve conduit connection port .

Compared with the prior art, the utility model has the advantages that: the utility model does not need to disassemble the pilot safety valve, and only needs a simple structure to realize the set pressure verification of the pilot valve and the main valve in the pilot safety valve , It can also detect the tightness of the pilot valve and the main valve. It greatly reduces the labor intensity during calibration, especially for the calibration of pilot safety valves with large diameters and high installation positions in natural gas engineering equipment, which greatly reduces the calibration time. The whole device is easy to carry, and the calibration data is accurate and complete, which fully solves the on-site calibration problem of enterprises using pilot safety valves for natural gas engineering equipment, and can effectively guarantee the production safety of various oil and gas enterprises.

In addition, there is a combustible gas alarm device, which can quickly detect the concentration of combustible gas, and send an alarm signal when the combustible gas concentration reaches the set explosion or poisoning alarm critical point, so as to remind the staff to take safety measures to prevent explosion, fire and poisoning ACCIDENT.

These features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and accompanying drawings.

【Description of drawings】

Below in conjunction with accompanying drawing, utility model is described further:

Fig. 1 is a structural schematic diagram of an on-line calibration device for a portable explosion-proof miniature gas cylinder driven by a pilot type safety valve of the present invention;

Reference signs: portable high-pressure gas cylinder 1, high-pressure gas cylinder connecting pipe 2, gas source pressure gauge 3, combustible gas alarm device 4, calibration valve 5, calibration pressure gauge 1 6, calibration pressure gauge 2 7, calibration Use high-pressure hose 8, three-way valve 9, first high-pressure hose 10, pilot valve to connect female connector 11, second high-pressure hose 12, main valve to female connector 13, pressure relief valve 14, portable calibration control cabinet 15 .

【Detailed ways】

The technical solutions of the embodiments of the present invention will be explained and described below in conjunction with the accompanying drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present utility model.

Those skilled in the art can understand that, under the condition of no conflict, the features in the following embodiments and implementation manners can be combined with each other.

The utility model is applied to the on-line calibration of the pilot safety valve on the compressed natural gas transmission engineering equipment. Since the safety valve has an important function of overpressure protection, relevant laws and regulations require regular calibration of the safety valve, and the safety valve is generally calibrated at least once a year. test once. Limited to compressed natural gas transmission engineering equipment that cannot be stopped for years of operation, combined with the working principle of the pilot-operated safety valve, the pilot valve and the main valve are opened and closed through the conduit connected to the pilot-operated safety valve to realize the opening and closing of the pilot-operated safety valve. Check the set pressure of pilot valve and main valve and the tightness of pilot valve and main valve.

Referring to Fig. 1, a portable explosion-proof miniature gas cylinder drives a pilot-operated safety valve on-line calibration device, including a portable high-pressure gas cylinder 1, a portable calibration control cabinet 15, and the portable calibration control cabinet 15 is provided with a first Joint, second joint, air source pressure gauge 3, calibration valve 5, pressure relief valve 14, calibration pressure gauge and three-way valve 9, the first joint is connected to high-pressure gas cylinder connecting pipe 2, air source pressure gauge 3, calibration valve The test valve 5, the pressure relief valve 14, the high-pressure gas cylinder connecting pipe 2 are connected to the high-pressure gas cylinder, and the test valve is also connected to the second joint. The position is connected to the calibration pressure gauge, the calibration interface is connected to the high-pressure hose 8 for calibration, the high-pressure hose 8 for calibration is connected to one of the interfaces of the three-way valve 9, and the other two interfaces of the three-way valve pass through the first The high-pressure hose 10 is connected with the pilot valve, and the second high-pressure hose 12 is connected with the main valve.

It can be understood that there are two calibration pressure gauges, i.e. calibration pressure gauge 1 6 and calibration pressure gauge 2 7, one of which is selected for use and the other is for standby. The connecting pipe of the high-pressure gas cylinder can be set longer to facilitate the connection, for example, 10 meters.

Further, the portable calibration control cabinet 15 is also equipped with a combustible gas alarm device 4, which sends out an alarm signal when the concentration of combustible gas (ie natural gas) reaches the set explosion or poisoning alarm critical point. It can quickly detect that the gas concentration reaches the critical point of the explosion or poisoning alarm setting and send out an alarm signal to remind the work to take safety measures to prevent explosion, fire, and poisoning accidents. Combustible gas alarm 4 can directly adopt prior art. It can be understood that the explosion or poisoning alarm critical point can be set as required.

In order to realize quick connection and disassembly, the end of the first high-pressure hose is provided with a pilot valve connection female joint 11 that is matched with the connection port of the pilot valve conduit, and the end of the second high-pressure hose is provided with a female joint 11 that is matched with the connection port of the main valve conduit. The main valve is connected to the female joint 13 . Wherein, the main valve connection female connector and the pilot valve connection female connector select appropriate threaded adapters according to the specifications of the pilot safety valve. The first high-pressure hose 10 and the second high-pressure hose 12 can be selected, for example, 1 meter.

According to the above-mentioned portable explosion-proof miniature gas cylinder-driven pilot type safety valve on-line calibration device, a corresponding on-line calibration method is designed, including the following steps:

1) Turn on the combustible gas alarm 4, and make sure that the combustible gas alarm is normal.

2) Connect the portable control cabinet 15 to the portable high-pressure gas cylinder 1, slowly turn on the gas source until it is fully open, observe the gas source pressure gauge 3, and determine whether the gas source pressure meets the calibration requirements.

3) According to the principle of 1.5 times to 3 times the set pressure of the pilot valve to be calibrated, select a pressure gauge with a suitable range for calibration and install it.

4) Close the cut-off valve at the bottom of the pilot safety valve, slowly loosen the nut on the main valve conduit of the pilot safety valve, monitor the exhaust sound at the loose nut between the main valve and the conduit, and pay attention to whether the combustible gas alarm 4 is alarming, In case of an alarm, stop the operation immediately and lock and reset the guide nut of the main valve of the pilot valve.

5) If the exhaust sound continues for a long time without weakening and changing, then lock and reset the nut on the main valve conduit of the pilot-operated safety valve. It is preliminarily determined that the root stop valve under the pilot valve is damaged, and the root stop valve needs to be repaired before on-line maintenance. check.

6) If there is no exhaust sound, lock and reset the nut on the main valve conduit of the pilot valve. It is preliminarily determined that the conduit of the pilot valve is seriously blocked, and the pilot valve needs to be repaired before online calibration.

7) If the exhaust sound gradually decreases, continue to slowly loosen the connecting nut of the main valve until there is no exhaust sound at all, then slowly loosen the connecting nut of the pilot valve, and finally remove the connecting pipe between the main valve and the pilot valve.

8) Select a suitable thread adapter, connect the first high-pressure hose 10 and the second high-pressure hose 12 to the main valve and the pilot valve respectively, and check whether each connection point is locked.

9) Close the pressure relief valve 14, slowly open the calibration valve 5, observe the pressure of the pressure gauge, when the pressure rises to 50% of the set pressure of the safety valve required by the user, close the calibration valve 5, and check the tightness of all connecting parts.

10) If there is leakage, open the pressure relief valve 14, release the pressure of the gas in the high-pressure hose until the pointer of the pressure gauge is zero, check the leakage point and re-seal the connection, and return to step 9.

11) If there is no leakage, increase the pressure slowly. When the pressure rises to 90% of the required set pressure, the increase rate should be less than 0.01MPa/S until it is opened. If the set pressure does not meet the requirements, close the calibration valve 5, open the pressure relief valve 14 to release the pressure below 70% of the required set pressure, adjust the safety valve to be calibrated to the specified set pressure and open it three times, and the constant pressure calibration is over. Open the pressure relief valve 14, close the calibration valve 5, and make data records.

12) Close the pressure relief valve 14, slowly open the calibration valve 5, when the pressure rises to 90% of the required set pressure, close the calibration valve 5, and check whether there is any leakage at each connection point. If there is no leakage, keep the pressure for 3 minutes, and observe whether the pointer of the pressure gauge drops. If there is no drop, it is judged that the leak tightness of the pilot valve to be calibrated is qualified; if there is a drop, it is judged that the leak tightness of the pilot valve to be checked is unqualified, and online calibration is required after maintenance.

The utility model combines the working principle of the pilot-operated safety valve, and realizes the opening and closing of the pilot valve and the main valve by connecting the conduit of the pilot-operated safety valve to pressurize it. Check the tightness of the valve and the main valve. The utility model device is simple and portable, has high calibration accuracy, can adapt to various complex environments, overcomes the problem that the existing calibration equipment cannot meet the pilot safety valve calibration, not only reduces the calibration work intensity but also solves the calibration cycle Safety protection of internal equipment.

The above is only a specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the accompanying drawings and the descriptions in the above specific embodiments. content. Any modifications that do not deviate from the functional and structural principles of the utility model shall be included in the scope of the claims.

Claims (3)

1. The portable explosion-proof miniature gas cylinder driving pilot operated safety valve on-line calibration device is characterized by comprising a portable high-pressure gas cylinder and a portable calibration control cabinet, wherein a first joint, a second joint, a gas source pressure gauge, a calibration valve, a pressure relief valve, a calibration pressure gauge and a three-way valve are arranged in the portable calibration control cabinet; the high-pressure gas cylinder connecting pipe is connected with the high-pressure gas cylinder, the check valve is connected with the pressure release valve, the check valve is further connected with the second connector, a pressure gauge mounting clamp and a check interface are arranged on the second connector, the pressure gauge mounting clamp is connected with the check pressure gauge, the check interface is connected with a high-pressure hose for checking, the high-pressure hose for checking is connected with one interface of the three-way valve, the other two interfaces of the three-way valve are respectively connected with the pilot valve through the first high-pressure hose, and the second high-pressure hose is connected with the main valve.

2. The portable on-line calibration device for the pilot operated safety valve driven by the explosion-proof micro gas cylinder as claimed in claim 1, wherein the portable calibration control cabinet is further provided with a combustible gas alarm which sends out an alarm signal when the concentration of the combustible gas reaches a set explosion or poisoning alarm critical point.

3. The portable on-line checking device for the pilot safety valve driven by the explosion-proof micro gas cylinder as claimed in claim 1, wherein the end of the first high pressure hose is provided with a pilot connection female joint which is in matching connection with the pilot conduit connection port, and the end of the second high pressure hose is provided with a main valve connection female joint which is in matching connection with the main valve conduit connection port.

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