Rapid maintenance device for P / V valve of gas station

Abstract

The utility model discloses a gas station P / V valve rapid maintenance device which comprises a P / V valve and a ball valve connected with the P / V valve through a ventilation vertical pipe, the ball valve is provided with a gas connector communicated with the ventilation vertical pipe and a first switch for controlling the gas connector to be opened and closed, and the gas connector is respectively connected with a pressure detection device and a pressure providing device through pipelines. According to the utility model, the P / V valve detection and simple maintenance work are simplified, the operation is convenient, the gas station can also operate, and the environmental protection illegal risk caused by the leakage of the P / V valve is avoided; the purpose of detecting the working condition of the P / V valve is achieved by using as low as possible investment.

Description

Technical Field

[0001] The utility model relates to a valve rapid maintenance device, in particular to a P / V valve rapid maintenance device for a gas station. Background Art

[0002] The P / V valve (also written as PV valve) is a valve used to control the pressure in the gasoline tank of a gas station within a certain range. It can be opened under positive and negative pressure conditions within the specified range to maintain the air pressure in the gasoline tank of a gas station within the range of -2kpa to +3kpa.

[0003] Volatile organic compounds are the main pollutants in gas stations. Currently, the P / V valve of a gas station is the largest emission path of volatile organic compounds in a gas station. The operation of the P / V valve of a gas station is directly related to the emission of volatile organic compounds in the gas station. Once the P / V valve leaks, it will lead to a large amount of volatile organic compounds being emitted, which is both illegal and polluting the environment. There are currently two methods to detect whether the P / V valve is leaking. One is to use a combustible gas detector to directly approach the P / V valve for measurement, and the other is to use an OGI (i.e., an infrared gas imager) for observation (for details, please refer to the national standard "HJ 733-2014 Technical Guidelines for the Detection of Volatile Organic Compounds from Leaks and Open Liquid Surface Emissions"). The P / V valve of a gas station is generally installed at a height of more than 4m. The P / V valve of some gas stations is set above the gas station canopy, and the height of the P / V valve exceeds 10m. The use of a combustible gas detector requires the detector to be within 1cm of the P / V valve, which involves high-altitude operations, which is inconvenient to operate and increases management costs. OGI can generally detect the leakage of volatile organic compounds within 50 meters, but the current price of domestic OGI is more than 700,000 yuan per unit, and the price of imported OGI is generally more than 1 million yuan per unit, which is very expensive. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a quick maintenance device for a P / V valve in a gas station.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A quick maintenance device for a P / V valve at a gas station comprises a P / V valve and a ball valve connected to the P / V valve via a ventilation riser, the ball valve is provided with a gas interface connected to the ventilation riser and a first switch for controlling the opening and closing of the gas interface, and the gas interface is respectively connected to a pressure detection device and a pressure providing device via pipelines.

[0007] As a preferred embodiment, the pressure detection device is connected to a second switch.

[0008] As a preferred embodiment, the pressure providing device is connected to a third switch.

[0009] Further preferably, the ventilation riser is also provided with a flame arrester.

[0010] Further preferably, the pressure detection device is a pressure gauge or a pressure sensor.

[0011] Further preferably, the pressure providing device is an air pump or a manual inflation / inhalation device.

[0012] This device is mainly divided into two parts, namely a fixed part and a mobile part. The fixed part needs to be fixed at the gas station, one at each gas station, and is fixedly installed. The fixed part is a structural improvement on the existing ball valve at the gas station, which does not require hot work and has no related safety risks. The mobile part is mainly a pressure detection device and a pressure providing device. The mobile part can be moved as needed. When the fixed part and the mobile part are combined, the operation of the P / V valve can be detected to determine whether it is leaking. If the P / V valve is not operating well, the present invention is used to introduce compressed air into the ventilation riser under the P / V valve for purging to clear internal debris and dust, thereby playing a role in repairing and maintaining the P / V valve.

[0013] The utility model has the following advantages:

[0014] ① Simplify the P / V valve inspection and simple maintenance work, make it easy to operate, and the gas station itself can also operate it, eliminating the risk of environmental violations caused by P / V valve leakage; ② Use the lowest possible investment to achieve the purpose of detecting the working condition of the P / V valve; ③ Avoid high-altitude operations and hot work as much as possible to reduce management risks. ④ No impact on the existing processes of the gas station. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0016] The utility model is described in detail below in conjunction with the accompanying drawings.

[0017] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0018] Example: Figure 1 A quick maintenance device for a P / V valve at a gas station is shown, comprising a P / V valve 1, a ball valve 3 connected to the P / V valve via a ventilation riser, the ball valve 3 being provided with a gas interface connected to the ventilation riser and a first switch 7 for controlling the opening and closing of the gas interface, the gas interface being connected to a pressure detection device and a pressure providing device respectively via pipelines.

[0019] The pressure detection device is connected to a second switch 8. The pressure providing device is connected to a third switch 6. The ventilation riser is also provided with a flame arrester 2. The pressure detection device is a pressure gauge 5. The pressure providing device is an air pump 4.

[0020] Working method of the device: After closing the ball valve 3, open the first switch 7, the second switch 8 and the third switch 6, and provide positive pressure and negative pressure to the pipeline space between the P / V valve 1 and the ball valve 3 through the air pump 4. Under a certain air extraction / inflation flow rate, observe the reading of the pressure gauge 5 to determine whether the opening pressure of the P / V valve meets the requirements of positive pressure between 2 and 3kpa and negative pressure between -2kpa and -1.5kpa. After stopping ventilation, observe the stability of the reading of the pressure gauge 5 to detect whether the P / V valve 1 is leaking.

[0021] ① Effectiveness: According to the relevant provisions of the national standards "GB50156-2021 Technical Standards for Automobile Refueling, Gas and Hydrogenation Stations" and "GB20952-2020 Gas Station Air Pollutant Emission Standards", the opening pressure of the P / V valve at a gas station should meet the positive pressure between 2 and 3 kpa and the negative pressure between -2 kpa and -1.5 kpa, and should be kept closed when not opened. Therefore, the basic principle of the operation of the P / V valve at a gas station is the pressure borne by the P / V valve. The present invention uses a pressure gauge to directly measure the positive and negative pressures when the P / V valve is opened, which fully complies with the requirements of relevant standards; it also complies with the requirements of relevant standards to determine whether the P / V valve is leaking by measuring the pressure stability in the pipeline under the P / V valve.

[0022] The device has been used on site in some gas stations for more than 8 months, and OGI has also been used to compare with the present invention. It has been confirmed that the test results of the present invention are consistent with those of OGI and the combustible gas detector, and fully meet the needs of gas stations for testing the operating status of P / V valves.

[0023] ② Cost control: This device has no impact on the existing processes of gas stations. When installing the equipment, only 8 screws need to be removed and installed, and no fire or high-altitude operations are involved. The fixed part of this equipment is modified from the ball valve used by the gas station itself. The equipment and installation costs are less than 400 yuan / station (including labor costs). The cost of the mobile part is about 2,000 yuan / set. According to the current layout of gas stations in Sichuan Province, calculated based on monthly inspections (the Sichuan standard is once every 6 months), each set of mobile equipment can meet the inspection needs of at least 20 gas stations. Compared with the cost investment of OGI, which is more than 1 million, the investment of this invention can be basically ignored.

[0024] The present invention is not limited to the above-mentioned specific implementation modes, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A quick maintenance device for P / V valves at gas stations, characterized by: It includes a P / V valve and a ball valve connected to the P / V valve through a ventilation riser. The ball valve is provided with a gas interface connected to the ventilation riser and a first switch for controlling the opening and closing of the gas interface. The gas interface is connected to a pressure detection device and a pressure providing device through pipelines.

2. A gas station P / V valve quick maintenance device according to claim 1, characterized in that: The pressure detection device is connected to a second switch.

3. A gas station P / V valve quick maintenance device according to claim 1, characterized in that: The pressure providing device is connected to a third switch.

4. A gas station P / V valve quick maintenance device according to claim 1, 2 or 3, characterized in that: The ventilation riser is also provided with a flame arrester.

5. A quick maintenance device for P / V valves at a gas station according to claim 1, 2 or 3, characterized in that: The pressure detection device is a pressure gauge or a pressure sensor.

6. A quick maintenance device for P / V valves at a gas station according to claim 1, 2 or 3, characterized in that: The pressure providing device is an air pump or a manual filling / inhalation device.

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