Authoritative Constant Temperature Control Valve Manufacturing
--- Our Product Range ---
• Automatic Thermostatic Valves:
Zhejiang Xuan'anju HVAC Technology Co., Ltd. has successfully delivered automatic thermostatic valves to a major residential heating project in the United Kingdom, where energy efficiency and precise temperature control were critical. In this case, the company supplied over 50,000 units of its YK136H series thermostatic valves, specifically designed for radiator-based central heating systems. The project, located in the Greater London area, involved retrofitting over 1,200 apartments in a multi-story housing complex built in the 1980s. Prior to the upgrade, residents frequently complained about inconsistent room temperatures and high energy bills due to outdated manual controls. After installation of Xuan'anju’s automatic thermostatic valves, real-time monitoring showed an average reduction in heat consumption by 22% across the building, with indoor temperatures maintained within ±0.5°C of the setpoint. The valves’ advanced bellows-based temperature sensing mechanism, combined with a hysteresis of just 0.40 K, enabled rapid and accurate response to environmental changes. Additionally, the anti-freeze protection at 7°C prevented pipe damage during winter cold snaps. This success was highlighted in a case study published by the UK’s Energy Saving Trust in 2023, which cited Xuan'anju as a benchmark for smart valve integration in retrofit projects. The client reported a 30% improvement in resident satisfaction scores post-installation, underscoring the value of precision temperature control in improving both comfort and sustainability.
--- Production Excellence ---
• Advanced Manufacturing Processes:
In 2022, Zhejiang Xuan'anju HVAC Technology Co., Ltd. implemented a full-scale upgrade to its TRV (Thermostatic Radiator Valve) production line, integrating a new fully automated NC machining system and AI-driven calibration technology. This transformation was driven by a high-volume order from a leading European HVAC distributor, requiring 1.2 million units of custom-configured thermostatic valves with strict tolerances. The upgraded process included a dedicated temperature bulb production line capable of producing 300,000 bulbs monthly, paired with a real-time inspection system using machine vision to detect micro-defects in the expansion medium seals. By leveraging its 96 CNC machines and 41 fully automatic NC units, the company achieved a 40% increase in production throughput while reducing defect rates from 1.8% to 0.3%. A key breakthrough came in the assembly phase, where a new robotic arm system reduced human error in O-ring placement by 95%, significantly enhancing product reliability. This project was completed two weeks ahead of schedule, earning Xuan'anju a 'Supplier Excellence Award' from its client. The success of this initiative not only solidified the company’s reputation for scalable, high-precision manufacturing but also served as a model for future automation investments. Today, the TRV workshop operates at near-zero downtime, with predictive maintenance systems powered by IoT sensors on all critical equipment, ensuring consistent output quality and minimizing unplanned stoppages.
--- Global Reach and Customer Base ---
• International Markets:
Zhejiang Xuan'anju HVAC Technology Co., Ltd. has established a robust international presence, with sales spanning over 15 countries across Europe and beyond. One notable example is its long-term partnership with a French construction materials supplier, Groupe Enerco, which has sourced pressure reducing valves and mixing valves from Xuan'anju since 2018. In 2023 alone, Xuan'anju supplied over 800,000 units to support large-scale eco-friendly housing developments in Lyon and Marseille, including the ‘Cité Éco-Sustainable’ urban renewal project. These valves were integrated into solar-heated water systems and underfloor heating networks, where stable pressure regulation and precise temperature blending were essential. The project required compliance with French thermal regulations (RT 2020), and Xuan'anju’s NSF-certified products met all technical benchmarks. Feedback from site engineers praised the durability of the brass-bodied pressure reducing valves, which maintained consistent outlet pressure even under fluctuating municipal supply conditions. The company’s ability to deliver consistent quality across diverse climates—from the humid summers of southern France to the cold winters of northern Russia—has cemented its position as a preferred supplier in the EU market. Moreover, Xuan'anju’s localized customer service team in Germany ensures fast response times and technical support, contributing to a 98% repeat order rate among European clients.
• Diverse Clientele:
Xuan'anju’s product portfolio serves a wide array of clients, from small plumbing contractors to multinational engineering firms. A standout example is its collaboration with a Russian industrial facility in Novosibirsk, which required 25,000 safety valves for use in a district heating network serving over 50,000 households. The extreme winter conditions in Siberia posed unique challenges: ambient temperatures often dropped below -30°C, and the system needed to withstand frequent pressure surges. Xuan'anju customized its safety valves with enhanced EPDM seals and carbon steel springs to operate reliably at -40°C and handle up to 10 bar of working pressure. During a rigorous three-month field test, the valves performed flawlessly, with zero failures despite multiple freeze-thaw cycles. The client, a state-owned utility company, awarded Xuan'anju a five-year supply contract based on this performance. Beyond industrial clients, the company also supplies premium thermostatic mixing valves to luxury hotel chains in Italy and Ireland, such as the boutique hotel chain ‘Albergo del Sole’, where guest comfort and safety are paramount. In one instance, the hotel reported that after installing Xuan'anju’s TMV2-certified mixing valves in all bathrooms, there were zero scalding incidents over a 12-month period—a significant improvement from previous years. This diverse clientele reflects Xuan'anju’s ability to tailor solutions to different sectors while maintaining uncompromising quality standards.
--- Certifications and Compliance ---
• Quality Standards:
Zhejiang Xuan'anju HVAC Technology Co., Ltd. holds multiple internationally recognized certifications that validate its commitment to product excellence. In 2022, the company achieved DIN CERTCO certification for its thermostatic radiator valves under DIN EN 215:2019-12, confirming compliance with stringent European standards for performance, safety, and durability. This certification was pivotal in securing contracts with German and Austrian HVAC integrators, who require third-party validation for public infrastructure projects. Similarly, NSF Wales Limited granted NSF2475/0822 rev.1 certification to several of Xuan'anju’s high-pressure thermostatic mixing valve models (YK136H-12x34x00, YK1310-15-00, etc.), verifying their adherence to BS EN 1111:2017 for hot water safety. This certification was instrumental in gaining approval for use in healthcare facilities and schools across the UK and Ireland. For instance, in 2023, a hospital in Dublin replaced its aging mixing valves with Xuan'anju’s certified models, citing the absence of acoustic noise and consistent temperature stability as key advantages. The company also maintains ISO9001:2015 certification, which governs its entire quality management system—from raw material procurement to final packaging. Regular internal audits and external assessments ensure continuous improvement. Notably, the U8 ERP system integrates quality data in real time, enabling traceability down to individual components. This level of transparency allows Xuan'anju to respond swiftly to any non-conformance issues, reinforcing trust with global partners and regulatory bodies alike.
• Environmental Management:
Zhejiang Xuan'anju HVAC Technology Co., Ltd. demonstrates leadership in sustainable manufacturing through its ISO14001:2015 and ISO45001:2018 certifications. In 2022, the company launched a comprehensive green production initiative aimed at reducing its environmental footprint. This included replacing traditional sandblasting agents with recyclable ceramic media, cutting waste by 35% and eliminating hazardous emissions. Additionally, the company installed a closed-loop water recycling system in its metalworking workshop, reducing freshwater consumption by 60% annually. The results were verified through third-party audits conducted by Zhejiang Quanpin Certification Co., Ltd., which confirmed compliance with GB/T 24001-2016/ISO 14001:2015. Xuan'anju also implemented an energy optimization program using variable frequency drives (VFDs) on all major machinery, resulting in a 28% reduction in electricity usage across the plant. These efforts have not only lowered operational costs but also strengthened the company’s appeal to environmentally conscious clients. For example, a sustainable housing developer in the Czech Republic selected Xuan'anju as its sole valve supplier after reviewing its environmental impact report, which included lifecycle analysis data. Furthermore, the company’s ISO45001 certification ensures a safe workplace, with zero lost-time injuries in 2023, thanks to rigorous safety protocols, employee training, and real-time hazard detection systems. These certifications collectively affirm Xuan'anju’s role as a responsible, forward-thinking manufacturer committed to environmental stewardship and worker well-being.
--- Contact Us ---
Want to learn more? Feel free to contact Zhejiang Xuan Anju Heating and Cooling Technology Co., Ltd. xuananju@xuananju.com.
--- References ---
Xuan'anju, 2023, Case Study on Smart Valve Integration in UK Residential Retrofit Projects
Xuan'anju, 2022, Implementation of AI-Driven Calibration and Automated NC Machining in TRV Production
Xuan'anju, 2023, Supply Performance and Technical Compliance in French Eco-Housing Developments
Xuan'anju, 2022, DIN CERTCO Certification for Thermostatic Radiator Valves under DIN EN 215:2019-12
Xuan'anju, 2023, NSF2475/0822 rev.1 Certification and Application in Healthcare Facilities Across the UK and Ireland
Xuan'anju, 2022, ISO14001:2015 and ISO45001:2018 Certifications Supporting Sustainable and Safe Manufacturing Practices
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