The national regulations on card vouchers cannot expire.

The national regulations on card vouchers cannot expire. For consumers, it is undoubtedly a great constraint on their reasonable right to use. The provision of "expired invalid coupons" is unfair, and the above-mentioned redemption period is decided by the merchants themselves, which is a typical overlord clause and infringes on the legitimate rights and interests of consumers.

1. If the flow rate is far below the minimum flow rate to ensure accuracy, there will be no output (such as vortex flowmeter) or the output signal will be cut off as a small signal (such as differential pressure flowmeter), which is unfavorable to the supplier and unfair.

2. In order to prevent the loss of benefits, for a specific set of thermal energy metering equipment, the supply and demand sides often agree that a certain flow value is "agreed lower limit flow" according to the flow measurement range and the achievable range, and agree that if the actual flow is less than the agreed value, it will be charged according to the lower limit flow.

3. The metrological administrative department of the people's government at or above the county level may set up metrological verification institutions as needed, or authorize metrological verification institutions of other units to perform compulsory verification and other verification and testing tasks. Personnel who perform the verification and testing tasks specified in the preceding paragraph must pass the examination. This function is usually realized in the flow display instrument. The metrological administrative department of the local people's government at or above the county level shall, according to the needs of the local area, establish public standard instruments of measurement, which shall be used after passing the examination presided over by the metrological administrative department of the people's government at a higher level.

4. Enterprises and institutions may, according to the needs, establish the measurement standards used by their own units, and the highest measurement standards shall be used after passing the examination presided over by the metrological administrative department of the relevant people's government. 5. Metrological verification shall be carried out on site in accordance with the principle of economy and rationality. Metrological verification must be carried out in accordance with the national metrological verification system table. The national metrological verification system table shall be formulated by the metrological administrative department of the State Council.

legal ground

Law of People's Republic of China (PRC) on the Protection of Consumer Rights and Interests

Article 7 Consumers have the right to protect personal and property safety when purchasing and using commodities and receiving services. Consumers have the right to demand that the goods and services provided by business operators meet the requirements of protecting personal and property safety.

Article 35 The people's court shall take measures to facilitate consumers to bring lawsuits. Disputes over consumers' rights and interests that meet the requirements of People's Republic of China (PRC) Civil Procedure Law must be accepted and tried in time.