How to reverse the water meter

1. Water meters used in daily life are divided into two categories. The first category is ordinary mechanical water meters and drip-proof water meters. The second category is intelligent IC card water meter and remote water meter. Because of the excellent anti-reverse performance of smart water meters, the phenomenon of water meter inversion mainly appears in ordinary water meters.

2. Let's talk about human factors in water meter inversion. The method of artificial inversion is very simple. Just disassemble the water meter and install it upside down. When the water meter is installed backwards, the reading of the water meter will go backwards, resulting in a huge measurement error, which is also the most direct method to steal water leakage fees at present.

You can buy some water meter anti-disassembly devices-heat shrinkable film, which is called anti-disassembly artifact in the water meter industry. Just put it on the nozzle when installing the water meter. Blow it with hot water or a hair dryer, and it will fit the nozzle very well. If you want to disassemble the meter backwards, you must break the heat-shrinkable flexible diaphragm. This is an effective method.

3. Let's look at the external factors again. Inverted water meter should belong to a kind of water meter rotation macroscopically, so the reason that causes water meter rotation also applies to inverted water meter.

This is simply a matter of water meter turning. Although the national standard says that the water meter is allowed to rotate within a certain limit, the water meter is completely uncontrollable. At present, only control can avoid the rotation of water meter as much as possible. For example, you can install an exhaust valve and a check valve, which can avoid the rotation of the water meter to the maximum extent.

Extended data

Mr. Zhu, who lives in Jiajing Community, Rong 'an, Haishu District, called this newspaper and said that his water fee in July and August was abnormal, which was much higher than that in the same period last year. The reporter then conducted an investigation.

"I went to pay the water bill last week. After deducting the money, I found that the water fee in July and August was as high as 120 yuan. In the same period last year, my water fee was only 70 yuan. " Mr. Zhu said that it was very strange at the time.

Immediately after returning home, I checked my water meter and found that the water meter turned abnormally. It turns clockwise and counterclockwise. The water meter is still running after all the taps in the house are tightened. "I called the property, and the property said that my family lives in a multi-storey residential building. Water supply is provided directly by the water supply company. If there is a problem, I will go directly to the water company. "

The reporter contacted the pipe network section of Haishu Water Supply Branch of Ningbo Water Supply Corporation. The staff of the pipe network department said that some residents' water meters above the fourth floor of Rong 'an Jiajing multi-storey residential building were indeed abnormal, because the Baoshan Road pipeline was cut off some time ago, and the air was not completely discharged after the water was passed, which led to the air entering the water pipes of Rong 'an Jiajing Community and the peripheral pipes in residents' homes. The water meters were upside down.

"Rongan Jiajing Community is at the end of the water supply pipe network of the waterworks. Due to various reasons such as water pressure, it is difficult to exhaust the air accumulated in the pipeline. "The staff member said," Last week, the company sent someone to install an exhaust valve at the entrance of the community. The day before yesterday morning, the staff went to the community to work out specific solutions. The day before yesterday afternoon 1, the community stopped water for half an hour. Let's close the main valve, drain the remaining water in the pipeline, and then reopen the valve. So the air in the pipeline should have been exhausted. "

The staff member also said: "We will observe it for a while. If there is nothing wrong with the water meter, then the problem should be basically solved. In addition, we are also connecting the water supply pipeline of Baoshan Road where Rong 'an Jiajing is located with the water supply pipeline of Liuting Street. After the circulation is formed, the air backlog should not happen again. "

Regarding the situation that residents in the residential area pay more water charges, the staff of the business hall of Haishu Water Supply Branch said that after the problem is solved, they will cooperate with the residential property to refund more water charges to the residents, so please rest assured.

The reporter learned that in order to avoid such a situation from happening again, Haishu Water Supply Branch immediately arranged relevant departments to conduct spot checks on several communities. The results of spot checks show that there is no water meter inversion in other communities.

Why does the water meter turn back and forth? According to Zhao Zong, an engineer of Ningbo Water Meter Co., Ltd., the mechanical water meter is driven by the flow of water. When air enters the end of the water pipe and is compressed to a certain extent by the pressure of water, it will expand, leading to the inversion of the water meter.

When the inlet pressure is greater than the expansion pressure, the water meter will rotate clockwise again. This is how the water meter turns around later. This situation has also occurred in other cities.

References: ningbo net, China? The water meter at home will turn around.