Overview of Constant Temperature Control Valves

--- Understanding Constant Temperature Control Valves ---

• What are Constant Temperature Control Valves?:

Constant temperature control valves are intelligent components used in central heating and underfloor heating systems to maintain a stable and comfortable indoor environment. By automatically adjusting the flow of hot water based on real-time room temperature feedback, these valves ensure that the heat input into radiators remains consistent with the user’s preset temperature. This precise regulation not only enhances thermal comfort but also significantly reduces energy waste. For example, in a residential building in the Czech Republic, Zhejiang Xuan'anju's thermostatic valves were installed across 120 apartments in a newly constructed eco-friendly housing complex. Prior to installation, residents frequently complained about overheating in certain rooms and cold spots in others. After integrating Xuan'anju’s automatic thermostatic valves, the building management reported a 28% reduction in gas consumption over one winter season, while tenant satisfaction increased by 45%, as confirmed by post-installation surveys. The valves’ ability to respond within 20 minutes to temperature deviations—thanks to their advanced bellows-based sensing mechanism—ensured rapid adjustments without overshooting. Furthermore, the valves’ anti-freeze protection at 7°C and maximum operating temperature tolerance up to 100°C make them ideal for harsh climates. With a hysteresis of just 0.40 K and minimal pressure influence (0.40 K), the system maintains stability even under fluctuating water pressures. These features have made Xuan'anju’s valves a preferred choice among European HVAC integrators, particularly in countries like France and Ireland where energy efficiency regulations are stringent. Their proven performance in real-world applications underscores the critical role of constant temperature control valves in modern sustainable building design.

--- Key Products from Zhejiang Xuan'anju HVAC ---

• Automatic Thermostatic Valves:

Zhejiang Xuan'anju HVAC Technology Co., Ltd. specializes in high-precision automatic thermostatic valves (TRVs) that serve as the backbone of smart heating systems. Each valve integrates a temperature-sensing bulb filled with an expansion medium, which reacts to ambient temperature changes by expanding or contracting. This movement drives a mechanical actuator to adjust the valve stem, thereby modulating the hot water flow into radiators. The company’s TRVs offer a temperature adjustment range of 7–28°C with a scale marking from ❄ to 5, allowing users to fine-tune their comfort levels. In a large-scale retrofit project in London, UK, Xuan'anju supplied over 6,500 TRVs to upgrade aging heating systems in a 40-year-old apartment block. Before the upgrade, the building experienced uneven heat distribution and excessive energy use due to manual radiator controls. After installing Xuan'anju’s TRVs, the property manager observed a 31% drop in annual heating costs and a 90% reduction in complaints related to temperature inconsistencies. The valves’ robust construction—including ABS handwheels, EPDM gaskets, and brass valve cores—ensures long-term durability even in high-humidity environments. Additionally, the inclusion of a protective handwheel prevents accidental tampering, maintaining system integrity. The valves are compatible with various radiator types and can be easily retrofitted into existing systems. With a monthly production capacity of 500,000 units across five injection molding machines and full automation in calibration and assembly lines, Xuan'anju ensures consistent quality and timely delivery. This scalability, combined with rigorous testing protocols, makes the company a trusted supplier for major HVAC distributors across Europe, including those serving clients in Italy and Russia.

--- Benefits of Using Constant Temperature Control Valves ---

• Energy Efficiency and Cost Savings:

The integration of constant temperature control valves directly translates into substantial energy savings and reduced operational costs. A case study conducted in a commercial office building in Yuhuan City, China, demonstrated this benefit clearly. The facility, housing over 200 employees, had previously relied on traditional manual radiator valves, resulting in frequent overheating during morning hours and inadequate heating in late afternoon. After replacing all manual valves with Zhejiang Xuan'anju’s automatic thermostatic valves, the building’s annual heating expenses dropped by 36% over two consecutive winters. The system’s ability to maintain a steady 20°C setpoint—despite external temperature swings and variable occupancy patterns—was attributed to the valves’ responsive design and low hysteresis (0.40 K). Moreover, the building’s carbon footprint decreased by approximately 18 tons of CO₂ annually, aligning with national green building standards. Another notable example comes from a solar-heated residential complex in Ireland, where Xuan'anju’s TRVs were paired with solar thermal collectors. The system achieved optimal heat distribution even when solar output varied throughout the day, preventing both overheating and heat loss. The combination of solar energy and intelligent valve control led to a 42% reduction in reliance on auxiliary gas boilers. These real-world outcomes highlight how Xuan'anju’s valves not only improve comfort but also support broader sustainability goals. With an average annual growth rate of 16.14% in output value since 2016 and a 23.96% year-on-year increase in 2022 alone, the company’s commitment to innovation and efficiency continues to drive market leadership in the HVAC sector.

• Improved Indoor Comfort and Safety:

Beyond energy savings, constant temperature control valves significantly enhance indoor comfort and safety—particularly in sensitive environments such as homes for elderly residents and childcare facilities. In a nursing home located in the French Alps, Zhejiang Xuan'anju’s thermostatic mixing valves were deployed to regulate hot water supply across 80 rooms. The facility previously faced risks of scalding due to sudden fluctuations in hot water temperature, especially when cold water supplies were interrupted. Xuan'anju’s mixing valves, equipped with a thermosensitive element inside the outlet, automatically shut off hot water flow if cold water is cut off—preventing burns. Over a six-month period, the facility recorded zero incidents of scalding, compared to three cases in the previous year. Residents also reported higher satisfaction scores, citing more consistent water temperatures and fewer discomfort spikes. Similarly, in a school renovation project in the UK, Xuan'anju’s TRVs were installed in classrooms and staff rooms. Teachers noted that students no longer complained about being too hot or too cold during class, leading to improved concentration and attendance. The valves’ ability to resist pressure and temperature variations—maintaining accuracy even with inlet pressure changes—ensured reliable performance. Additionally, the company’s safety valves, certified under EN215 and DIN EN 215:2019, provide fail-safe protection in case of system overpressure, further enhancing overall safety. These real-life implementations demonstrate that Xuan'anju’s products do more than regulate temperature—they actively contribute to safer, healthier living and working environments.

--- Quality Assurance and Certifications ---

• Commitment to Quality at Zhejiang Xuan'anju:

Zhejiang Xuan'anju HVAC Technology Co., Ltd. maintains an unwavering commitment to quality, backed by a comprehensive certification portfolio and state-of-the-art laboratory testing. The company holds multiple international certifications, including ISO9001 (quality management), ISO14001 (environmental management), ISO45001 (occupational health and safety), and TELL, TMV2, and NSF certifications—all of which validate its adherence to global standards. Notably, several of its thermostatic mixing valve models (YK136H-12x34x00, YK1310-15-00, etc.) have received NSF2475/0822 rev.1 certification, confirming compliance with BS EN 1111:2017 for high-pressure thermostatic mixing valves. This certification, valid until September 2027, is recognized by healthcare and public sector clients across the UK and EU. In addition, the company’s TRVs are certified under DIN CERTCO’s CEN KEYMARK scheme (Certification No. 011-6T0043), ensuring conformity with DIN EN 215:2019. To uphold these standards, Xuan'anju operates a fully equipped laboratory with pressure testers, temperature cycling chambers, leak detection systems, and automated calibration tools. Every batch undergoes 100% functional testing before shipment. For instance, during a recent audit by DIN CERTCO, a random sample of 200 TRVs was tested under extreme conditions—ranging from -10°C to 100°C and varying pressure loads. All units passed with zero defects. The company’s U8 ERP system further enhances traceability, enabling real-time monitoring of production batches, material sourcing, and quality checks. This digital transparency ensures that every product meets exacting specifications—from raw copper processing in the metalworking workshop to final packaging. With over 175 employees and a production area spanning 9,000 square meters, Xuan'anju combines scale with precision, making it a benchmark in the HVAC industry. Its continuous investment in R&D and quality infrastructure reflects a long-term vision: delivering safe, reliable, and future-ready solutions for global markets.

--- Contact Us ---

--- References ---

Zhejiang Xuan'anju HVAC Technology Co., Ltd., 2023, Automatic Thermostatic Valves for Smart Heating Systems

Zhejiang Xuan'anju HVAC Technology Co., Ltd., 2022, Energy Efficiency and Thermal Comfort in Residential and Commercial Buildings

Zhejiang Xuan'anju HVAC Technology Co., Ltd., 2021, Quality Assurance and Certification Standards in HVAC Control Valves

Zhejiang Xuan'anju HVAC Technology Co., Ltd., 2023, Real-World Performance of Constant Temperature Control Valves in European Housing Projects

Zhejiang Xuan'anju HVAC Technology Co., Ltd., 2022, Safety Enhancements through Thermostatic Mixing Valves in Healthcare Facilities

Zhejiang Xuan'anju HVAC Technology Co., Ltd., 2024, Sustainable Building Design with Intelligent Temperature Control Solutions

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Overview of Constant Temperature Control Valves

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