The Founding Ceremony and First General Assembly of the Chengde City Water Supply and Drainage Association Were Successfully Held.

Recently, the founding ceremony and first general assembly of the Chengde City Water Supply and Drainage Association were successfully held at Yunshan Hotel. A total of over 80 people attended, including representatives from 31 member units as well as heads of water supply and wastewater treatment enterprises from some non-member units in our city.

The All-China Federation of Trade Unions delivers “cooling” gift packs to frontline workers.

This summer in Chengde, aside from the torrential rains, temperatures have remained persistently high since the start of "Rufu" (the beginning of the hottest period of the year), making the heat unbearable. To bring a bit of relief and convey the care and concern of the Party and the government to frontline workers who are steadfastly performing their duties outdoors in scorching heat, the district federation of trade unions has launched a “Delivering Coolness” condolence campaign across the entire district.

After-sales and Warranty Service Commitment

In June 2002, the company obtained ISO9000 quality standard certification. Strictly adhering to the GB/T 19001-2008 idt ISO 9001:2008 “Quality Management Systems – Requirements” standard, the company has established a quality assurance system tailored to its specific characteristics, taking into account the company’s current situation, product features, quality policy, quality objectives, and employee qualifications. This system primarily encompasses the following aspects:

Automatic Thermostatic Water-Saving Mixer

The automatic thermostatic water-saving mixing valve is a complementary product specially developed by Hebei Chengde Longzhida Intelligent Instrument & Meter Technology Co., Ltd. for hot-water systems. It is designed to automatically mix cold and hot water, providing consistently temperature-controlled water for single-pipe shower systems. A single automatic thermostatic water-saving mixing valve can simultaneously power multiple shower heads. This valve operates automatically by leveraging the pressure and temperature of the medium flowing through it—no external power supply or secondary instruments are required. The automatic thermostatic water-saving mixing valve is ideally suited for public bathhouses and can be used with various single-pipe shower fixtures, such as foot-operated or infrared showers. Thanks to its high precision in maintaining a constant water temperature, it significantly enhances bathing comfort while ensuring that the water flow stops when the user leaves the shower area. As a result, it eliminates the need for manual temperature adjustments during bathing, saving 20% to 50% more water compared to conventional dual-pipe shower systems. Therefore, this product represents a new, energy-efficient and water-saving solution. Key features of the automatic thermostatic water-saving mixing valve: 1. Compared to volumetric mixing systems (which typically rely on water tanks), the automatic thermostatic water-saving mixing valve occupies much less space and requires significantly smaller installation areas. Consequently, associated infrastructure costs and construction expenses are also substantially reduced. Moreover, when compared to other thermostatic systems with similar functionality, this valve offers an excellent performance-to-price ratio. 2. The automatic thermostatic water-saving mixing valve is simple and convenient to install. It is fixed onto the wall using brackets and then connected to both the cold and hot water supply pipes. The output interface is simply linked to the shower fixture. 3. The automatic thermostatic water-saving mixing valve boasts high temperature stability, completely eliminating the issue of fluctuating water temperatures during showers. 4. The automatic thermostatic water-saving mixing valve is equipped with an automatic shut-off function for water supply interruptions. Whether the cold or hot water supply line experiences a failure and stops delivering water, the valve will automatically cease operation, effectively preventing scalding and cold-shock accidents.

The mixing valve for hot and cold water alternates between hot and cold—what alternative mixing devices are available?

The mixing valve in your shower is causing the water temperature to fluctuate—sometimes hot, sometimes cold. Is there any alternative mixing device that could solve this problem? Of course! You can try an automatic thermostatic mixing valve for baths. Generally speaking, mixing devices are indispensable in bath facilities—whether it’s a mixing valve installed on the main supply line or a separate mixing valve for each individual showerhead. The principle behind all mixing valves is simple: they have a cold-water inlet and a hot-water inlet, and by adjusting the ratio of cold and hot water flowing into them, they produce water at a comfortable, consistent temperature. When we encounter sudden fluctuations in water temperature—alternating between hot and cold—it often means we need to readjust the water temperature again and again. This phenomenon is particularly noticeable in public bathing facilities such as bathhouses, swimming pools, hotels, and guesthouses. On the one hand, these temperature fluctuations make users feel uncomfortable during showers; if the water is too hot, it can easily scald elderly people or children who require care. On the other hand, constantly readjusting the water temperature also results in a significant waste of hot water. In most cases, these temperature fluctuations are caused by variations in the pressure difference between the cold and hot water flows during the mixing process. Especially in public bath facilities, where the number of simultaneous bathers is not fixed and constantly changes, the pressure difference between cold and hot water flow will always fluctuate, leading to inconsistent water temperatures from the mixing valve. To address this issue, many bathhouses today use a dual-pipe water supply system—each showerhead is equipped with a standard mixing valve. This method works well when pressure fluctuations are relatively small and when personalized water temperature adjustments are needed. However, it’s less effective in places where the number of bathers varies significantly. Since each showerhead has different resistance to cold and hot water flow, even slight pressure fluctuations can cause the outlet water temperature to fluctuate dramatically. Therefore, using the traditional dual-pipe approach to solve this problem requires making the cold and hot water pipes as identical as possible, which can help reduce temperature fluctuations somewhat. But when the supply water temperature itself changes, this approach starts to show its limitations. Faced with changing supply water temperatures, some people have come up with pipe-mounted temperature control valves. These are temperature-controlled products developed based on conventional mixing valves. Their basic structure is similar to that of ordinary mixing valves: they have a cold-water inlet, a hot-water inlet, and a mixed-water outlet. The working principle of the pipe-mounted temperature control valve is this: at the outlet of the valve, there’s a sensor that detects water temperature. By sensing the water temperature, the sensor moves the valve core, opening or closing the cold and hot water inlets to adjust the proportion of cold and hot water entering the mix. Once the desired outlet water temperature is set via a temperature knob, whenever the incoming cold and hot water temperatures or the pressure difference between them change, the sensor detects the new water temperature and adjusts the valve core accordingly, keeping the outlet water temperature stable. Another type of mixing method is called the tank-based mixing system. A tank-based mixing valve consists of an electronic water temperature controller (control cabinet), an array of solenoid valves, a water temperature sensor, and a mixing tank. Its key feature is that it requires hot water at around 60°C and cannot use steam. Cold and hot water are fed separately into the mixing tank, where they’re thoroughly mixed according to the temperature setting chosen by the user on the controller (control cabinet). The mixed water is then delivered through an outlet pipe to the bathroom, where it supplies single-pipe thermostatic showerheads. Compared to the tank-based bathwater supply method, this system offers performance similar to a tank-based automatic temperature control system—but it occupies a larger area and requires the use of a water tank. All these mixing methods have their own drawbacks. So how should we choose the right mixing equipment? If your mixing valve keeps producing fluctuating water temperatures—sometimes hot, sometimes cold—is there any alternative mixing device that could work better? Let me help you answer this question. Chengde Intelligent Instrument & Meter Technology Co., Ltd. has accumulated extensive experience in the field of bathroom hot water systems over the years. Together with Tsinghua University and Beijing University of Aeronautics and Astronautics, we’ve jointly researched and developed an automatic thermostatic mixing valve. This innovative device solves both the problem of fluctuating supply water temperatures and the issue of temperature instability caused by changes in cold and hot water pressure. Plus, it eliminates the need for a bulky hot water storage tank, saving space and reducing manufacturing costs. The Chengde Longzhida Automatic Thermostatic Mixing Valve is a mechatronic device that uses a temperature sensor to detect water temperature, a microcomputer to control the system, and solenoid valves to drive the adjustment. It automatically adjusts the water temperature to reach the preset usage temperature. This device is suitable for bathhouses in government agencies, enterprises, institutions, and public venues, as well as industries such as chemical processing, dyeing, and others that require constant water temperature. With minor modifications, it can also be used in central air-conditioning cooling systems and heating systems for maintaining constant water temperature. The primary working principle is to take advantage of the pressure difference between cold and hot water. Based on the flow rate of the warm water being used, the device opens and closes solenoid valves to regulate the amount of cold water mixed into the hot water, thereby precisely controlling the water temperature. If your mixing valve keeps producing fluctuating water temperatures—sometimes hot, sometimes cold—is there any alternative mixing device that could work better? Try an automatic thermostatic mixing valve for baths! Our company has established cooperative relationships with numerous universities, including Tsinghua and Peking University, and the feedback we’ve received has been very positive. As the manufacturer and patent holder of automatic thermostatic mixing valves for baths, our products are equally suitable for regulating and maintaining constant temperature in baths equipped with sensor-operated showerheads. If your bath facility is experiencing this issue, or if you’re planning to open a new bathhouse, feel free to give us a call! We’ll be happy to answer any questions you may have.

Complete Catalog and Quotations for Automatic Thermostatic Mixing Valves for Hot and Cold Water (Part 2)

A Complete Guide to Automatic Thermostatic Mixing Valves for Hot and Cold Water—Part II: In the previous installment, we covered the complete lineup and pricing of automatic thermostatic mixing valves for hot and cold water (Part I). In this issue, I’ll provide the remaining models and prices for the automatic thermostatic mixing valves specifically designed for large-scale bathhouses by Chengde Longzhida. Automatic thermostatic mixing valves are complementary devices developed for solar water heating systems and centralized hot water supply systems. Users can adjust the mixed-water temperature according to their actual needs. The desired temperature is quickly reached and stabilized, ensuring a consistently constant water temperature and eliminating the hassle of manual adjustments during bathing, thus saving energy, conserving water, and providing safe and comfortable showering experiences. These mixing valves are widely applicable in hotels, restaurants, hospitals, schools, bathhouses, industrial plants, and dyeing industries for maintaining constant water temperatures. At the mixed-water outlet of the valve body, a thermally sensitive element is installed. Utilizing the temperature-sensing properties of this element, the valve core is driven to move, either blocking or opening the inlets for hot and cold water. When cold water is blocked, hot water is simultaneously opened. Once the temperature adjustment knob is set to a specific temperature, the ratio of hot to cold water entering the outlet automatically adjusts accordingly, ensuring that the outlet water temperature remains consistently stable. The temperature adjustment knob can be set freely between 35°C and 65°C, and the thermostatic mixing valve will automatically maintain the set outlet water temperature. Now for the highlight! Here’s the complete lineup and pricing of automatic thermostatic mixing valves for hot and cold water—Part II, including models and prices for large-scale bathhouses: ◆ HSZ-50-BP Automatic Thermostatic Mixing Valve: (Up to 100 showerheads; best suited for large bathhouses) Working pressure: 0.05–1 MPa Temperature adjustment range: 32°C–48°C Ideal working pressure: 0.1–0.3 MPa Maximum flow rate: 50 m³/h Hot water temperature: 50–75°C Maximum hot water temperature: ≤75°C Material: Stainless steel Hot and cold water inlets: DN30 Thermostatic outlet: DN30 Equipment dimensions: 1030mm × 810mm × 1650mm ◆ HSZ-100-BP Automatic Thermostatic Mixing Valve: (Up to 200 showerheads; best suited for large bathhouses) Working pressure: 0.05–1 MPa Temperature adjustment range: 32°C–48°C Ideal working pressure: 0.1–0.3 MPa Maximum flow rate: 100 m³/h Hot water temperature: 50–75°C Maximum hot water temperature: ≤75°C Material: Stainless steel Hot and cold water inlets: DN30 Thermostatic outlet: DN30 Equipment dimensions: 1457mm × 980mm × 1850mm ◆ HSZ-150-BP Automatic Thermostatic Mixing Valve: (Up to 300 showerheads; best suited for large bathhouses) Working pressure: 0.05–1 MPa Temperature adjustment range: 32°C–48°C Ideal working pressure: 0.1–0.3 MPa Maximum flow rate: 200 m³/h Hot water temperature: 50–75°C Maximum hot water temperature: ≤75°C Material: Stainless steel Hot and cold water inlets: DN50 Thermostatic outlet: DN50 Maximum hot water temperature: ≤75°C Material: All-copper core with stainless steel housing Equipment dimensions: 1500mm × 1120mm × 2430mm A Complete Guide to Automatic Thermostatic Mixing Valves for Hot and Cold Water—Part II: If you’d like to request a quote, please call 17632100210 (Manager Zhang). We’ll provide you with a customized mixing valve solution and offer you the most suitable price!