Water meters are precision measuring instruments. If a user suspects that the water meter is malfunctioning, they may apply for testing by a legally recognized water meter verification authority. For meters that pass the verification, the applicant shall bear the testing costs and pay the fee based on the originally recorded meter reading. For meters that fail the verification, the respondent shall bear the testing costs and receive a refund of the water charges corresponding to the measured error.

The check valve on a water meter, also known as a non-return valve or backflow preventer, serves to prevent reverse flow in the event of a fluid-related accident.

1. Prevent the water meter from rotating to ensure accurate measurement of water consumption.

2. Reducing the frequency of the water meter’s self-rotation can effectively address the issue of self-rotation caused by pressure fluctuations.

3. It can effectively prevent the water meter from spinning idly due to backflow of tap water.

4. The check valve on the water meter can also be used with water meter-specific fittings.

Electromagnetic flowmeters primarily rely on the principle of electromagnetic induction. Below, we’ll introduce the various roles that electromagnetic flowmeters play in water supply systems.

1. For regional metrology

Electromagnetic flowmeters are widely used in urban pipe networks and play a crucial role in the measurement and distribution of water supply, maximizing convenience in water scheduling and allocation.

2. Used as a settlement water meter

The primary purpose of water flow meters is for water meter billing. As a tool used for water meter billing, electromagnetic flow meters play an important reference role.

3. For water plant flow measurement

Lay a solid foundation for water allocation and scheduling, and provide crucial data support for production management.

The pressure-free intelligent mixing valve is the company’s fifth-generation product, developed with independent intellectual property rights. It addresses the common on-site challenge that cold-water pressure must exceed hot-water pressure by 1 to 1.5 kilograms, while also resolving the issue of uncontrolled hot water flow. This device is an automated system that mixes cold and hot water in a fixed ratio to deliver consistently constant-temperature water, thereby solving problems such as fluctuating water pressure, erratic temperature changes, and difficulty in maintaining a stable water temperature during bathing. It places no special demands on cold- and hot-water pressures and features rapid mixing speed, stable outlet water temperature, and high control accuracy. It is primarily used in bathhouses, swimming pools, and other similar facilities, offering benefits such as energy savings, water conservation, low investment costs, compact footprint, and high return on investment.

There are many reasons why a vent valve might fail to discharge water. Among the most common causes is that the valve has been in use for too long, allowing numerous foreign objects to accumulate inside and cause blockage. If you encounter this issue, you can remove the cover to locate the small hole. Use a thin needle or a paperclip to carefully poke through the hole and extract the foreign objects. Then, gently tap the heating tube with a hammer. The valve will release the air, after which you can close it. Try again—once you’ve removed the impurities, the problem of the vent valve failing to discharge water should be resolved.

Smart water meters have become commonplace in households, but due to factors such as aging and prolonged use, water meters can sometimes encounter certain issues. Below, we’ll introduce several common problems that may arise with water meters and how to address them.

1. The card slot is unresponsive.

Since the IC-card smart water meter reads information via an IC card, if the card slot is exposed to the outside environment for extended periods, foreign objects can easily enter. Therefore, it’s important to clean it promptly and keep it tidy.

2. If you open the valve but there’s no water, what should you do?

If there’s no water when you open the valve, it’s possible that there’s no residual water left in the system. In this case, you’ll need to refill the system promptly. If, after successfully refilling the system, there’s still no water, you’ll need to conduct a detailed test.

3. Low effluent flow rate

A clogged faucet filter may result in a reduced water flow. You can try cleaning the filter and then check the water flow rate. It’s also possible that the issue is due to insufficient water pressure.

The three issues mentioned above are common problems that often arise. We hope this has helped clarify any confusion you may have. If you have any other questions, feel free to give us a call—we’re always happy to assist you. Chengde Longzhida Intelligent Instrument & Meter Technology Co., Ltd. specializes in the development of water meters that are easy to install, come with comprehensive after-sales service, and are convenient to use.

Of course, use an automatic thermostatic mixing valve for the bathtub. Typically, a bathtub can’t do without a mixing device—whether it’s a mixing valve installed on the main supply line or a separate mixing valve for each individual showerhead.

All these various mixing methods have their own drawbacks. So how should we choose the right water-mixing equipment? The Chengde Longzhida Automatic Constant-Temperature Mixing Device is a mechatronic water-mixing system that uses a temperature sensor to detect water temperature, a microcomputer for control, and a solenoid valve for actuation—automatically adjusting the water temperature to reach the preset target temperature. This device is suitable for bathhouses (rooms) in government agencies, organizations, enterprises, and public venues, as well as industries such as chemical processing, dyeing, and printing that require constant-temperature water. With slight modifications, it can also be used in central air-conditioning systems—for example, in cooling and heating systems where maintaining a stable water temperature is essential. The primary working principle of this device is to leverage the pressure difference between cold and hot water. Based on the flow rate of warm water being used, the device adjusts the amount of cold water mixed into the hot water by opening or closing the solenoid valve, thereby achieving precise temperature regulation.

The mixing valve in your bathtub keeps switching between hot and cold—could there be an alternative mixing device? How about trying our automatic thermostatic bathtub mixer! Our company has established cooperative relationships with numerous universities, including Tsinghua and Peking University, and the feedback we’ve received has been extremely positive. As the manufacturer and patent holder of automatic thermostatic bathtub mixers, our products are also perfectly suited for use in bathtubs equipped with sensor-activated showers, providing consistently comfortable, thermostatically controlled hot water. If your bathtub is experiencing this issue, or if you’re considering opening a bathhouse, feel free to give us a call for a consultation! We’ll be happy to answer any questions you may have.

With advances in technology, the market is gradually phasing out mechanical water meters and opting for prepaid smart water meters. So, what are the features of prepaid water meters?

1. It has good moisture resistance and is easy to use.

2. Encrypted using a key.

3. Features one card per meter or one card for multiple meters.

4. When the remaining water quantity is insufficient, promptly remind the user to purchase water.

5. The battery level is insufficient; the user is prompted to replace the battery.

6. Low flow rate, high precision,

7. Users can view information on the remaining water volume and cumulative water usage in the table via the user card.

Chengde Longzhida Intelligent Instrument & Meter Technology Co., Ltd. specializes in the R&D of water meters that feature high-quality craftsmanship, simple installation, and comprehensive after-sales service. If you’re interested, please feel free to contact us by phone.

After the mixing valve is installed, it also requires simple adjustments before it can be put into use. Below, we’ll introduce the adjustment methods for mixing valves.

1. When adjusting the temperature, turn the water flow to its maximum setting.

2. Turning the adjustment knob clockwise cools the temperature, while turning it counterclockwise heats it up. When making your first adjustment, be sure to move from the lower temperature setting toward the higher temperature setting to avoid burns.

3. At the low-temperature end of the adjustment knob, hot water is turned off; at the high-temperature end, cold water is turned off. If the hot water temperature isn't high, you can turn off the cold water and use only hot water for bathing.

4. If the inlet pressures of cold and hot water are inconsistent and no check valve is installed, be sure to turn the temperature control knob all the way to the low-temperature end—effectively shutting off the hot water—after each use, to minimize the risk of cold and hot water mixing. There are generally two installation methods: one is surface-mounted, and the other is concealed.

How is the mixing tank configured? The mixing tank can automatically adjust the flow rates of primary and secondary water based on the set supply water temperature required by the indoor heating temperature, thereby maintaining a stable supply water temperature in the secondary system and ensuring stable flow rates in both primary and secondary systems. This ensures that users receive the correct amount of heat, guarantees optimal heating performance and comfortable temperatures, and helps achieve energy savings.

Installation methods: wall-mounted boilers, centralized heating systems, heat pump units, solar energy systems, floor-standing boilers, and other types of boilers.

Scope of application: Underfloor radiant heating and cooling systems; capillary ceiling and wall radiant heating and cooling systems.

Chengde Longzhida Intelligent Instrument & Meter Technology Co., Ltd. has developed a mixer that boasts high-quality craftsmanship, simple installation, and comprehensive after-sales service. If you're interested, please feel free to contact us by phone.