HVAC Valve
Manufacturer & Supplier in China

Legom manufactures 68 HVAC valve models across six categories: thermostatic mixing valves (TMV) for blending hot and cold water to a safe set point; temperature and pressure relief valves (TP valves) for boiler and heater safety; freeze and scald protection valves for pipe and user safety; dynamic flow balancing and pressure limiting valves for hydronic circuit management; fan coil component valves for HVAC zoning; and the HFT thermostatic series for direct integration into thermostatic faucet and shower valve assemblies.

A thermostatic mixing valve blends hot and cold water supplies to deliver a consistent outlet temperature regardless of fluctuations in supply pressure or temperature. At its core is a wax thermostatic element that expands when the outlet temperature rises and contracts when it falls. This movement mechanically adjusts the ratio of hot to cold water passing through the valve, maintaining the set point without requiring any electrical input or external control signal. TMVs are used in residential hot water systems, underfloor heating circuits, solar thermal installations, and healthcare facilities where consistent and safe water temperature is critical.

The 910026NT freeze protection valve opens at 1.6°C to drain water from the pipe when freezing conditions are detected, preventing ice formation and the pipe damage that follows. It closes again at 7°C once the risk has passed. It protects the pipe itself. The 910028NT scald protection valve works in the opposite direction — it is a minimum temperature guard that stays closed when water temperature is below 35°C and opens progressively above 36.7°C. Rather than protecting against high temperatures, it ensures that only adequately hot water is delivered to the outlet, which is important for solar and storage hot water systems where lukewarm water can harbour Legionella bacteria. Both valves are passively operated by wax thermostatic elements and require no electrical input.

Legom HVAC valves are CE certified across the full range. Selected models carry additional certifications for specific market requirements: the 910034NT Mini TMV holds ASSE1070, CSA B125.3, and NSF 61/372 certification for the North American and Canadian healthcare markets. The 910018CC Solar TMV is certified to EN 1111 for European solar thermal applications. Certification documents are available upon request for procurement and compliance purposes. Contact the Legom technical team to confirm the specific certifications applicable to the model you are specifying.

Legom HVAC valve bodies are primarily manufactured in brass, which is the industry standard for thermostatic mixing valves, protection valves, and hydronic flow control applications due to its corrosion resistance, machinability, and durability under thermal cycling. Selected HFT series models are available with electroplated or natural pickled surface finishes depending on installation requirements. Internal components including seats, seals, and wax elements are specified to match the operating temperature and pressure range of each valve model. For applications with specific material requirements — such as stainless steel for marine or aggressive fluid environments — contact the Legom OEM team to discuss available options.

Legom HVAC valves are available in G1/2, G3/4, and G1 BSP thread configurations across the standard catalogue. The 910021NT central mixing valve uses 4×G3/4" ports. The HFT thermostatic series covers G1/2, G3/4, and G1 in multiple body styles. For other connection standards including NPT, or for larger bore configurations, contact the Legom OEM team with your dimensional requirements.

Legom is a manufacturer. All HVAC valves in the catalogue are produced at Legom's own facility in Jiaxing, Zhejiang, China, using in-house CNC machining, assembly, and pressure-testing equipment. We do not source finished valves from third-party suppliers and resell them. Every unit is assembled and tested at our facility before dispatch. Factory visits are welcome by appointment for clients who wish to audit the production process and quality systems directly.

MOQ is 1,000 units for both standard and custom models. Lead time for standard catalogue models is confirmed at the time of order — contact the Legom team for current production scheduling. For custom or ODM orders, lead time is project-based and agreed with the engineering team at the specification stage, as it depends on the scope of tooling or calibration work required.

Legom ships worldwide from Jiaxing, Zhejiang, China via sea freight, air freight, or express courier. We support all major international shipping terms including EXW, FOB Ningbo, CIF, and DDP depending on client preference. Full export documentation — commercial invoice, packing list, certificate of origin, and production test reports — is provided with every shipment.

Yes. Legom supplies HVAC valves to 400+ OEM partners in 90+ countries. Valves can be supplied under your brand with custom packaging, labelling, and product documentation. All OEM and private label projects are handled under strict confidentiality agreements. Contact the Legom sales team via WhatsApp or info@legomsmart.com to discuss your OEM requirements.